├── .gitignore ├── .swift-version ├── .travis.yml ├── EventBus iOS ├── AppDelegate.swift ├── Assets.xcassets │ ├── AppIcon.appiconset │ │ ├── Contents.json │ │ ├── Icon-60@2x.png │ │ ├── Icon-60@3x.png │ │ ├── Icon-76.png │ │ ├── Icon-76@2x.png │ │ ├── Icon-83.5@2x.png │ │ ├── Icon-Notification.png │ │ ├── Icon-Notification@2x.png │ │ ├── Icon-Notification@3x.png │ │ ├── Icon-Small-40.png │ │ ├── Icon-Small-40@2x.png │ │ ├── Icon-Small-40@3x.png │ │ ├── Icon-Small.png │ │ ├── Icon-Small@2x.png │ │ └── Icon-Small@3x.png │ ├── AppIcon.png │ ├── Contents.json │ └── diagram.imageset │ │ ├── Contents.json │ │ └── diagram.pdf ├── Base.lproj │ ├── LaunchScreen.storyboard │ └── Main.storyboard ├── Info.plist └── ViewController.swift ├── EventBus.xcodeproj ├── Configs │ └── Universal.xcconfig ├── project.pbxproj ├── project.xcworkspace │ ├── contents.xcworkspacedata │ └── xcshareddata │ │ └── IDEWorkspaceChecks.plist └── xcshareddata │ └── xcschemes │ ├── EventBus (Static).xcscheme │ └── EventBus.xcscheme ├── EventBus ├── ErrorHandler.swift ├── Errors.swift ├── EventBus.swift ├── EventChainable.swift ├── EventNotifiable.swift ├── EventRegistrable.swift ├── EventSubscribable.swift ├── Info.plist ├── LogHandler.swift ├── NSLocking+Extensions.swift └── Options.swift ├── EventBusTests ├── EventChainableTests.swift ├── EventNotifiableTests.swift ├── EventSubscribableTests.swift ├── Info.plist └── Utilities.swift ├── Icon.sketch ├── LICENSE ├── README.md ├── Swift-EventBus.podspec ├── jumbotron.png └── screencast.gif /.gitignore: -------------------------------------------------------------------------------- 1 | 2 | # Created by https://www.gitignore.io/api/swift 3 | 4 | ### Swift ### 5 | # Xcode 6 | # 7 | # gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore 8 | 9 | ## Build generated 10 | build/ 11 | DerivedData/ 12 | 13 | ## Various settings 14 | *.pbxuser 15 | !default.pbxuser 16 | *.mode1v3 17 | !default.mode1v3 18 | *.mode2v3 19 | !default.mode2v3 20 | *.perspectivev3 21 | !default.perspectivev3 22 | xcuserdata/ 23 | 24 | ## Other 25 | *.moved-aside 26 | *.xccheckout 27 | *.xcscmblueprint 28 | 29 | ## Obj-C/Swift specific 30 | *.hmap 31 | *.ipa 32 | *.dSYM.zip 33 | *.dSYM 34 | 35 | ## Playgrounds 36 | timeline.xctimeline 37 | playground.xcworkspace 38 | 39 | # Swift Package Manager 40 | # 41 | # Add this line if you want to avoid checking in source code from Swift Package Manager dependencies. 42 | # Packages/ 43 | # Package.pins 44 | .build/ 45 | 46 | # CocoaPods 47 | # 48 | # We recommend against adding the Pods directory to your .gitignore. However 49 | # you should judge for yourself, the pros and cons are mentioned at: 50 | # https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control 51 | # 52 | # Pods/ 53 | 54 | # Carthage 55 | # 56 | # Add this line if you want to avoid checking in source code from Carthage dependencies. 57 | Carthage/Checkouts 58 | Carthage/Build 59 | 60 | # fastlane 61 | # 62 | # It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the 63 | # screenshots whenever they are needed. 64 | # For more information about the recommended setup visit: 65 | # https://github.com/fastlane/fastlane/blob/master/fastlane/docs/Gitignore.md 66 | 67 | fastlane/report.xml 68 | fastlane/Preview.html 69 | fastlane/screenshots 70 | fastlane/test_output 71 | 72 | # End of https://www.gitignore.io/api/swift 73 | 74 | .DS_Store 75 | -------------------------------------------------------------------------------- /.swift-version: -------------------------------------------------------------------------------- 1 | 4.1 2 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: swift 2 | osx_image: xcode9.3beta 3 | script: 4 | - xcodebuild -scheme EventBus -project EventBus.xcodeproj -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 6,OS=11.3' build test 5 | -------------------------------------------------------------------------------- /EventBus iOS/AppDelegate.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import UIKit 6 | 7 | import EventBus 8 | 9 | @UIApplicationMain 10 | class AppDelegate: UIResponder, UIApplicationDelegate { 11 | 12 | var window: UIWindow? 13 | 14 | func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { 15 | // Override point for customization after application launch. 16 | 17 | EventBus.isStrict = true 18 | 19 | return true 20 | } 21 | 22 | func applicationWillResignActive(_ application: UIApplication) { 23 | // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state. 24 | // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game. 25 | } 26 | 27 | func applicationDidEnterBackground(_ application: UIApplication) { 28 | // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 29 | // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. 30 | } 31 | 32 | func applicationWillEnterForeground(_ application: UIApplication) { 33 | // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background. 34 | } 35 | 36 | func applicationDidBecomeActive(_ application: UIApplication) { 37 | // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface. 38 | } 39 | 40 | func applicationWillTerminate(_ application: UIApplication) { 41 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 42 | } 43 | } 44 | -------------------------------------------------------------------------------- /EventBus iOS/Assets.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "size" : "20x20", 5 | "idiom" : "iphone", 6 | "filename" : "Icon-Notification@2x.png", 7 | "scale" : "2x" 8 | }, 9 | { 10 | "size" : "20x20", 11 | "idiom" : "iphone", 12 | "filename" : "Icon-Notification@3x.png", 13 | "scale" : "3x" 14 | }, 15 | { 16 | "size" : "29x29", 17 | "idiom" : "iphone", 18 | "filename" : "Icon-Small@2x.png", 19 | "scale" : "2x" 20 | }, 21 | { 22 | "size" : "29x29", 23 | "idiom" : "iphone", 24 | "filename" : "Icon-Small@3x.png", 25 | "scale" : "3x" 26 | }, 27 | { 28 | "size" : "40x40", 29 | "idiom" : "iphone", 30 | "filename" : "Icon-Small-40@2x.png", 31 | "scale" : "2x" 32 | }, 33 | { 34 | "size" : "40x40", 35 | "idiom" : "iphone", 36 | "filename" : "Icon-Small-40@3x.png", 37 | "scale" : "3x" 38 | }, 39 | { 40 | "size" : "60x60", 41 | "idiom" : "iphone", 42 | "filename" : "Icon-60@2x.png", 43 | "scale" : "2x" 44 | }, 45 | { 46 | "size" : "60x60", 47 | "idiom" : "iphone", 48 | "filename" : "Icon-60@3x.png", 49 | "scale" : "3x" 50 | }, 51 | { 52 | "size" : "20x20", 53 | "idiom" : "ipad", 54 | "filename" : "Icon-Notification.png", 55 | "scale" : "1x" 56 | }, 57 | { 58 | "size" : "20x20", 59 | "idiom" : "ipad", 60 | "filename" : "Icon-Notification@2x.png", 61 | "scale" : "2x" 62 | }, 63 | { 64 | "size" : "29x29", 65 | "idiom" : "ipad", 66 | "filename" : "Icon-Small.png", 67 | "scale" : "1x" 68 | }, 69 | { 70 | "size" : "29x29", 71 | "idiom" : "ipad", 72 | "filename" : "Icon-Small@2x.png", 73 | "scale" : "2x" 74 | }, 75 | { 76 | "size" : "40x40", 77 | "idiom" : "ipad", 78 | "filename" : "Icon-Small-40.png", 79 | "scale" : "1x" 80 | }, 81 | { 82 | "size" : "40x40", 83 | "idiom" : "ipad", 84 | "filename" : "Icon-Small-40@2x.png", 85 | "scale" : "2x" 86 | }, 87 | { 88 | "size" : "76x76", 89 | "idiom" : "ipad", 90 | "filename" : "Icon-76.png", 91 | "scale" : "1x" 92 | }, 93 | { 94 | "size" : "76x76", 95 | "idiom" : "ipad", 96 | "filename" : "Icon-76@2x.png", 97 | "scale" : "2x" 98 | }, 99 | { 100 | "size" : "83.5x83.5", 101 | "idiom" : "ipad", 102 | "filename" : "Icon-83.5@2x.png", 103 | "scale" : "2x" 104 | }, 105 | { 106 | "idiom" : "ios-marketing", 107 | "size" : "1024x1024", 108 | "scale" : "1x" 109 | } 110 | ], 111 | "info" : { 112 | "version" : 1, 113 | "author" : "xcode" 114 | } 115 | } -------------------------------------------------------------------------------- /EventBus iOS/Assets.xcassets/AppIcon.appiconset/Icon-60@2x.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/regexident/EventBus/7ae8f64e56878b4e834c94276202d20db3daff9a/EventBus iOS/Assets.xcassets/AppIcon.appiconset/Icon-60@2x.png 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iOS/Assets.xcassets/diagram.imageset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "universal", 5 | "filename" : "diagram.pdf" 6 | } 7 | ], 8 | "info" : { 9 | "version" : 1, 10 | "author" : "xcode" 11 | } 12 | } -------------------------------------------------------------------------------- /EventBus iOS/Assets.xcassets/diagram.imageset/diagram.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/regexident/EventBus/7ae8f64e56878b4e834c94276202d20db3daff9a/EventBus iOS/Assets.xcassets/diagram.imageset/diagram.pdf -------------------------------------------------------------------------------- /EventBus iOS/Base.lproj/LaunchScreen.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | -------------------------------------------------------------------------------- /EventBus iOS/Base.lproj/Main.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 94 | 101 | 102 | 103 | 104 | 105 | 106 | 107 | 108 | 109 | 110 | 111 | 112 | 113 | 114 | 115 | 116 | 117 | 118 | 119 | 120 | 121 | 122 | 123 | 124 | 125 | 126 | 127 | 128 | 129 | 130 | 131 | 132 | 133 | 134 | 135 | 136 | 137 | 138 | 139 | -------------------------------------------------------------------------------- /EventBus iOS/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleDisplayName 8 | EventBus 9 | CFBundleExecutable 10 | $(EXECUTABLE_NAME) 11 | CFBundleIdentifier 12 | $(PRODUCT_BUNDLE_IDENTIFIER) 13 | CFBundleInfoDictionaryVersion 14 | 6.0 15 | CFBundleName 16 | $(PRODUCT_NAME) 17 | CFBundlePackageType 18 | APPL 19 | CFBundleShortVersionString 20 | 1.0 21 | CFBundleVersion 22 | 1 23 | LSRequiresIPhoneOS 24 | 25 | UILaunchStoryboardName 26 | LaunchScreen 27 | UIMainStoryboardFile 28 | Main 29 | UIRequiredDeviceCapabilities 30 | 31 | armv7 32 | 33 | UISupportedInterfaceOrientations 34 | 35 | UIInterfaceOrientationPortrait 36 | UIInterfaceOrientationLandscapeLeft 37 | UIInterfaceOrientationLandscapeRight 38 | 39 | UISupportedInterfaceOrientations~ipad 40 | 41 | UIInterfaceOrientationPortrait 42 | UIInterfaceOrientationPortraitUpsideDown 43 | UIInterfaceOrientationLandscapeLeft 44 | UIInterfaceOrientationLandscapeRight 45 | 46 | 47 | 48 | -------------------------------------------------------------------------------- /EventBus iOS/ViewController.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import UIKit 6 | 7 | import EventBus 8 | 9 | protocol Event { 10 | func handle(after: TimeInterval) 11 | } 12 | 13 | class Subscriber { 14 | let eventSubscribable: EventSubscribable 15 | let view: UIView 16 | 17 | init(eventSubscribable: EventSubscribable, view: UIView) { 18 | self.eventSubscribable = eventSubscribable 19 | self.view = view 20 | 21 | self.eventSubscribable.add(subscriber: self, for: Event.self) 22 | } 23 | } 24 | 25 | extension Subscriber: Event { 26 | func handle(after delay: TimeInterval) { 27 | DispatchQueue.main.asyncAfter(deadline: .now() + delay) { 28 | let backgroundColor = self.view.backgroundColor 29 | UIView.animate(withDuration: 0.25, animations: { 30 | self.view.backgroundColor = UIColor.red 31 | }, completion: { _ in 32 | UIView.animate(withDuration: 0.5) { 33 | self.view.backgroundColor = backgroundColor 34 | } 35 | }) 36 | } 37 | } 38 | } 39 | 40 | @IBDesignable 41 | class RoundedRectView: UIView { 42 | override init(frame: CGRect) { 43 | super.init(frame: frame) 44 | self.commonInit() 45 | } 46 | 47 | required init?(coder: NSCoder) { 48 | super.init(coder: coder) 49 | self.commonInit() 50 | } 51 | 52 | func commonInit() { 53 | self.backgroundColor = UIColor(red: 0.2745, green: 0.5572, blue: 0.8976, alpha: 1.0) 54 | self.layer.cornerRadius = 10.0 55 | } 56 | } 57 | 58 | class ViewController: UIViewController { 59 | 60 | @IBOutlet var publisherView: RoundedRectView! 61 | @IBOutlet var eventBusView: RoundedRectView! 62 | @IBOutlet var subscriberViewTop: RoundedRectView! 63 | @IBOutlet var subscriberViewMiddle: RoundedRectView! 64 | @IBOutlet var subscriberViewBottom: RoundedRectView! 65 | @IBOutlet var diagramView: UIImageView! 66 | @IBOutlet var containerView: UIView! 67 | 68 | let eventBus: EventBus = .init(options: [.warnUnhandled]) 69 | var timer: Timer! 70 | 71 | var subscribers: [Subscriber] = [] 72 | 73 | override func viewDidLoad() { 74 | super.viewDidLoad() 75 | 76 | self.subscribers = [ 77 | Subscriber(eventSubscribable: eventBus, view: self.subscriberViewTop), 78 | Subscriber(eventSubscribable: eventBus, view: self.subscriberViewMiddle), 79 | Subscriber(eventSubscribable: eventBus, view: self.subscriberViewBottom), 80 | ] 81 | 82 | self.timer = Timer.scheduledTimer(withTimeInterval: 3.0, repeats: true) { _ in 83 | self.ping() 84 | } 85 | self.timer.fire() 86 | } 87 | 88 | override func didReceiveMemoryWarning() { 89 | super.didReceiveMemoryWarning() 90 | // Dispose of any resources that can be recreated. 91 | } 92 | 93 | func ping() { 94 | self.eventBus.notify(Event.self) { subscriber in 95 | subscriber.handle(after: 2.0) 96 | } 97 | 98 | self.emitSignal(color: UIColor.red, onPath: { 99 | let path = UIBezierPath() 100 | path.move(to: self.publisherView.center) 101 | path.addLine(to: self.eventBusView.center) 102 | return path 103 | }()) 104 | 105 | DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) { 106 | self.emitSignal(color: UIColor.red, onPath: { 107 | let startFrame = self.eventBusView.frame 108 | let endFrame = self.subscriberViewTop.frame 109 | let startPoint = CGPoint(x: startFrame.maxX, y: startFrame.midY) 110 | let endPoint = CGPoint(x: endFrame.minX, y: endFrame.midY) 111 | let path = UIBezierPath() 112 | path.move(to: self.eventBusView.center) 113 | path.addLine(to: startPoint) 114 | path.addCurve( 115 | to: startPoint.applying(.init(translationX: 10.0, y: -10.0)), 116 | controlPoint1: startPoint.applying(.init(translationX: 5.0, y: 0.0)), 117 | controlPoint2: startPoint.applying(.init(translationX: 10.0, y: -5.0)) 118 | ) 119 | path.addLine(to: startPoint.applying(.init(translationX: 10.0, y: -50.0))) 120 | path.addCurve( 121 | to: endPoint, 122 | controlPoint1: endPoint.applying(.init(translationX: -10.0, y: 5.0)), 123 | controlPoint2: endPoint.applying(.init(translationX: -5.0, y: 0.0)) 124 | ) 125 | path.addLine(to: self.subscriberViewTop.center) 126 | return path 127 | }()) 128 | } 129 | 130 | DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) { 131 | self.emitSignal(color: UIColor.red, onPath: { 132 | let path = UIBezierPath() 133 | path.move(to: self.eventBusView.center) 134 | path.addLine(to: self.subscriberViewMiddle.center) 135 | return path 136 | }()) 137 | } 138 | 139 | DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) { 140 | self.emitSignal(color: UIColor.red, onPath: { 141 | let startFrame = self.eventBusView.frame 142 | let endFrame = self.subscriberViewBottom.frame 143 | let startPoint = CGPoint(x: startFrame.maxX, y: startFrame.midY) 144 | let endPoint = CGPoint(x: endFrame.minX, y: endFrame.midY) 145 | let path = UIBezierPath() 146 | path.move(to: self.eventBusView.center) 147 | path.addLine(to: startPoint) 148 | path.addCurve( 149 | to: startPoint.applying(.init(translationX: 10.0, y: 10.0)), 150 | controlPoint1: startPoint.applying(.init(translationX: 5.0, y: 0.0)), 151 | controlPoint2: startPoint.applying(.init(translationX: 10.0, y: 5.0)) 152 | ) 153 | path.addLine(to: startPoint.applying(.init(translationX: 10.0, y: 50.0))) 154 | path.addCurve( 155 | to: endPoint, 156 | controlPoint1: endPoint.applying(.init(translationX: -10.0, y: -5.0)), 157 | controlPoint2: endPoint.applying(.init(translationX: -5.0, y: 0.0)) 158 | ) 159 | path.addLine(to: self.subscriberViewBottom.center) 160 | return path 161 | }()) 162 | } 163 | } 164 | 165 | func emitSignal(color: UIColor, onPath animationPath: UIBezierPath) { 166 | let signalLayer = CALayer() 167 | signalLayer.backgroundColor = color.cgColor 168 | signalLayer.bounds = CGRect(origin: CGPoint(), size: CGSize(width: 10.0, height: 10.0)) 169 | signalLayer.cornerRadius = 5.0 170 | signalLayer.position = self.publisherView.center 171 | signalLayer.opacity = 0.0 172 | 173 | let positionAnimation = CAKeyframeAnimation(keyPath: "position") 174 | positionAnimation.path = animationPath.cgPath 175 | 176 | let opacityAnimation = CAKeyframeAnimation(keyPath: "opacity") 177 | opacityAnimation.values = [0.0, 1.0, 1.0, 0.0] 178 | 179 | let animationGroup = CAAnimationGroup() 180 | animationGroup.animations = [ 181 | positionAnimation, 182 | opacityAnimation 183 | ] 184 | animationGroup.repeatCount = 1 185 | animationGroup.duration = 1.0 186 | animationGroup.delegate = AnimationDelegate(layer: signalLayer) 187 | 188 | signalLayer.add(animationGroup, forKey: nil) 189 | self.containerView.layer.addSublayer(signalLayer) 190 | } 191 | } 192 | 193 | class AnimationDelegate: NSObject { 194 | 195 | let layer: CALayer 196 | 197 | init(layer: CALayer) { 198 | self.layer = layer 199 | } 200 | } 201 | 202 | extension AnimationDelegate: CAAnimationDelegate { 203 | func animationDidStart(_ animation: CAAnimation) { 204 | // Do nothing 205 | } 206 | 207 | func animationDidStop(_ animation: CAAnimation, finished: Bool) { 208 | self.layer.removeFromSuperlayer() 209 | } 210 | } 211 | -------------------------------------------------------------------------------- /EventBus.xcodeproj/Configs/Universal.xcconfig: -------------------------------------------------------------------------------- 1 | PRODUCT_NAME = $(TARGET_NAME) 2 | SUPPORTED_PLATFORMS = macosx iphoneos iphonesimulator appletvos appletvsimulator watchos watchsimulator 3 | DYLIB_INSTALL_NAME_BASE = @rpath 4 | OTHER_SWIFT_FLAGS = -DXcode 5 | 6 | SDKROOT[sdk=iphone*] = iphoneos 7 | VALID_ARCHS[sdk=iphone*] = arm64 armv7 armv7s 8 | IPHONEOS_DEPLOYMENT_TARGET = 9.0 9 | TARGETED_DEVICE_FAMILY[sdk=iphone*] = 1,2 10 | LD_RUNPATH_SEARCH_PATHS[sdk=iphone*] = $(inherited) @executable_path/Frameworks @loader_path/Frameworks 11 | 12 | SDKROOT[sdk=appletv*] = appletvos 13 | TVOS_DEPLOYMENT_TARGET = 10.0 14 | TARGETED_DEVICE_FAMILY[sdk=appletv*] = 3 15 | LD_RUNPATH_SEARCH_PATHS[sdk=appletv*] = $(inherited) @executable_path/Frameworks @loader_path/Frameworks 16 | 17 | SDKROOT[sdk=watch*] = watchos 18 | WATCHOS_DEPLOYMENT_TARGET = 3.0 19 | TARGETED_DEVICE_FAMILY[sdk=watch*] = 4 20 | LD_RUNPATH_SEARCH_PATHS[sdk=watch*] = $(inherited) @executable_path/Frameworks @loader_path/Frameworks 21 | 22 | SDKROOT[sdk=macosx*] = macosx 23 | VALID_ARCHS[sdk=macosx*] = x86_64 24 | MACOSX_DEPLOYMENT_TARGET = 10.11 25 | LD_RUNPATH_SEARCH_PATHS[sdk=macosx*] = $(inherited) @executable_path/../Frameworks @loader_path/../Frameworks 26 | -------------------------------------------------------------------------------- /EventBus.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 4 | classes = { 5 | }; 6 | objectVersion = 46; 7 | objects = { 8 | 9 | /* Begin PBXBuildFile section */ 10 | BF2118441DF488DF00FF863D /* EventSubscribableTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF2118431DF488DF00FF863D /* EventSubscribableTests.swift */; }; 11 | BF2118581DF5772800FF863D /* AppDelegate.swift in 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/EventBus.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /EventBus.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | IDEDidComputeMac32BitWarning 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /EventBus.xcodeproj/xcshareddata/xcschemes/EventBus (Static).xcscheme: -------------------------------------------------------------------------------- 1 | 2 | 5 | 8 | 9 | 15 | 21 | 22 | 23 | 24 | 25 | 30 | 31 | 33 | 39 | 40 | 41 | 42 | 43 | 49 | 50 | 51 | 52 | 53 | 54 | 64 | 65 | 71 | 72 | 73 | 74 | 75 | 76 | 82 | 83 | 89 | 90 | 91 | 92 | 94 | 95 | 98 | 99 | 100 | -------------------------------------------------------------------------------- /EventBus.xcodeproj/xcshareddata/xcschemes/EventBus.xcscheme: -------------------------------------------------------------------------------- 1 | 2 | 5 | 8 | 9 | 15 | 21 | 22 | 23 | 24 | 25 | 30 | 31 | 33 | 39 | 40 | 41 | 42 | 43 | 49 | 50 | 51 | 52 | 53 | 54 | 64 | 65 | 71 | 72 | 73 | 74 | 75 | 76 | 82 | 83 | 89 | 90 | 91 | 92 | 94 | 95 | 98 | 99 | 100 | -------------------------------------------------------------------------------- /EventBus/ErrorHandler.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import Foundation 6 | 7 | internal protocol ErrorHandler { 8 | func eventBus(_ eventBus: EventBus, receivedUnknownEvent eventType: T.Type) 9 | func eventBus(_ eventBus: EventBus, droppedUnhandledEvent eventType: T.Type) 10 | func eventBus(_ eventBus: EventBus, receivedNonClassSubscriber subscriberType: T.Type) 11 | } 12 | 13 | internal struct DefaultErrorHandler: ErrorHandler { 14 | @inline(__always) 15 | internal func eventBus(_ eventBus: EventBus, receivedUnknownEvent eventType: T.Type) { 16 | #if DEBUG 17 | typealias ErrorType = UnknownEventError 18 | let errorName = String(describing: ErrorType.self) 19 | let eventTypes = eventBus.registeredEventTypes 20 | let eventNames = eventTypes.lazy.map { "\($0)" }.joined(separator: ", ") 21 | let namesString = eventNames.isEmpty ? "" : " (e.g. \(eventNames))" 22 | print("\(eventBus): Expected event of registered type\(namesString), found: \(eventType).") 23 | print("Info: Use a \"Swift Error Breakpoint\" on type \"EventBus.\(errorName)\" to catch.") 24 | if EventBus.isStrict { 25 | do { 26 | throw ErrorType() 27 | } catch { 28 | // intentionally left blank 29 | } 30 | } 31 | #endif 32 | } 33 | 34 | @inline(__always) 35 | internal func eventBus(_ eventBus: EventBus, droppedUnhandledEvent eventType: T.Type) { 36 | #if DEBUG 37 | typealias ErrorType = UnhandledEventError 38 | let errorName = String(describing: ErrorType.self) 39 | print("\(eventBus): Event of type '\(eventType)' was not handled.") 40 | print("Info: Use a \"Swift Error Breakpoint\" on type \"EventBus.\(errorName)\" to catch.") 41 | if EventBus.isStrict { 42 | do { 43 | throw ErrorType() 44 | } catch { 45 | // intentionally left blank 46 | } 47 | } 48 | #endif 49 | } 50 | 51 | @inline(__always) 52 | internal func eventBus(_ eventBus: EventBus, receivedNonClassSubscriber subscriberType: T.Type) { 53 | #if DEBUG 54 | typealias ErrorType = InvalidSubscriberError 55 | let errorName = String(describing: ErrorType.self) 56 | print("\(eventBus): Expected class, found struct/enum: \(subscriberType).") 57 | print("Info: Use a \"Swift Error Breakpoint\" on type \"EventBus.\(errorName)\" to catch.") 58 | if EventBus.isStrict { 59 | do { 60 | throw ErrorType() 61 | } catch { 62 | // intentionally left blank 63 | } 64 | } 65 | #endif 66 | } 67 | } 68 | -------------------------------------------------------------------------------- /EventBus/Errors.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import Foundation 6 | 7 | internal struct InvalidSubscriberError: Error { 8 | // intentionally left blank 9 | } 10 | 11 | internal struct UnknownEventError: Error { 12 | // intentionally left blank 13 | } 14 | 15 | internal struct UnhandledEventError: Error { 16 | // intentionally left blank 17 | } 18 | -------------------------------------------------------------------------------- /EventBus/EventBus.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import Foundation 6 | 7 | public protocol EventBusProtocol: class { 8 | var options: Options { get } 9 | } 10 | 11 | /// A type-safe event bus. 12 | public class EventBus: EventBusProtocol { 13 | 14 | internal struct WeakBox: Hashable { 15 | internal weak var inner: AnyObject? 16 | 17 | internal init(_ inner: AnyObject) { 18 | self.inner = inner 19 | } 20 | 21 | internal static func == (lhs: WeakBox, rhs: WeakBox) -> Bool { 22 | return lhs.inner === rhs.inner 23 | } 24 | 25 | internal static func == (lhs: WeakBox, rhs: AnyObject) -> Bool { 26 | return lhs.inner === rhs 27 | } 28 | 29 | internal var hashValue: Int { 30 | guard let inner = self.inner else { 31 | return 0 32 | } 33 | return ObjectIdentifier(inner).hashValue 34 | } 35 | } 36 | 37 | typealias WeakSet = Set 38 | 39 | public static var isStrict: Bool = false 40 | 41 | /// A global shared event bus configured using default options. 42 | public static let shared: EventBus = EventBus() 43 | 44 | /// The event bus' configuration options. 45 | public let options: Options 46 | 47 | /// The event bus' label used for debugging. 48 | public let label: String? 49 | 50 | internal var errorHandler: ErrorHandler = DefaultErrorHandler() 51 | internal var logHandler: LogHandler = DefaultLogHandler() 52 | 53 | fileprivate var knownTypes: [ObjectIdentifier: Any] = [:] 54 | 55 | fileprivate var registered: Set = [] 56 | fileprivate var subscribed: [ObjectIdentifier: WeakSet] = [:] 57 | fileprivate var chained: [ObjectIdentifier: WeakSet] = [:] 58 | 59 | fileprivate let lock: NSRecursiveLock = .init() 60 | fileprivate let notificationQueue: DispatchQueue 61 | 62 | /// Creates an event bus with a given configuration and dispatch notificationQueue. 63 | /// 64 | /// - Parameters: 65 | /// - options: the event bus' options 66 | /// - notificationQueue: the dispatch notificationQueue to notify subscribers on 67 | public init(options: Options? = nil, label: String? = nil, notificationQueue: DispatchQueue = .global()) { 68 | self.options = options ?? Options() 69 | self.label = label 70 | self.notificationQueue = notificationQueue 71 | } 72 | 73 | /// The event types the event bus is registered for. 74 | public var registeredEventTypes: [Any] { 75 | return self.registered.compactMap { self.knownTypes[$0] } 76 | } 77 | 78 | /// The event types the event bus has subscribers for. 79 | public var subscribedEventTypes: [Any] { 80 | return self.subscribed.keys.compactMap { self.knownTypes[$0] } 81 | } 82 | 83 | /// The event types the event bus has chains for. 84 | public var chainedEventTypes: [Any] { 85 | return self.chained.keys.compactMap { self.knownTypes[$0] } 86 | } 87 | 88 | @inline(__always) 89 | fileprivate func warnIfNonClass(_ subscriber: T) { 90 | // Related bug: https://bugs.swift.org/browse/SR-4420: 91 | guard !(type(of: subscriber as Any) is AnyClass) else { 92 | return 93 | } 94 | self.errorHandler.eventBus(self, receivedNonClassSubscriber: type(of: subscriber)) 95 | } 96 | 97 | @inline(__always) 98 | fileprivate func warnIfUnknown(_ eventType: T.Type) { 99 | guard self.options.contains(.warnUnknown) else { 100 | return 101 | } 102 | guard !self.registered.contains(ObjectIdentifier(eventType)) else { 103 | return 104 | } 105 | self.errorHandler.eventBus(self, receivedUnknownEvent: eventType) 106 | } 107 | 108 | @inline(__always) 109 | fileprivate func warnUnhandled(_ eventType: T.Type) { 110 | guard self.options.contains(.warnUnhandled) else { 111 | return 112 | } 113 | self.errorHandler.eventBus(self, droppedUnhandledEvent: eventType) 114 | } 115 | 116 | @inline(__always) 117 | fileprivate func logEvent(_ eventType: T.Type) { 118 | guard self.options.contains(.logEvents) else { 119 | return 120 | } 121 | self.logHandler.eventBus(self, receivedEvent: eventType) 122 | } 123 | 124 | @inline(__always) 125 | fileprivate func updateSubscribers(for eventType: T.Type, closure: (inout WeakSet) -> ()) { 126 | let identifier = ObjectIdentifier(eventType) 127 | let subscribed = self.subscribed[identifier] ?? [] 128 | self.subscribed[identifier] = self.update(set: subscribed, closure: closure) 129 | self.knownTypes[identifier] = String(describing: eventType) 130 | } 131 | 132 | @inline(__always) 133 | fileprivate func updateChains(for eventType: T.Type, closure: (inout WeakSet) -> ()) { 134 | let identifier = ObjectIdentifier(eventType) 135 | let chained = self.chained[identifier] ?? [] 136 | self.chained[identifier] = self.update(set: chained, closure: closure) 137 | self.knownTypes[identifier] = String(describing: eventType) 138 | } 139 | 140 | @inline(__always) 141 | fileprivate func update(set: WeakSet, closure: (inout WeakSet) -> ()) -> WeakSet? { 142 | var mutableSet = set 143 | closure(&mutableSet) 144 | // Remove weak nil elements while we're at it: 145 | let filteredSet = mutableSet.filter { $0.inner != nil } 146 | return filteredSet.isEmpty ? nil : filteredSet 147 | } 148 | } 149 | 150 | extension EventBus: EventRegistrable { 151 | public func register(forEvent eventType: T.Type) { 152 | let identifier = ObjectIdentifier(eventType) 153 | self.registered.insert(identifier) 154 | self.knownTypes[identifier] = String(describing: eventType) 155 | } 156 | } 157 | 158 | extension EventBus: EventSubscribable { 159 | public func add(subscriber: T, for eventType: T.Type) { 160 | return self.add(subscriber: subscriber, for: eventType, options: self.options) 161 | } 162 | 163 | public func add(subscriber: T, for eventType: T.Type, options: Options) { 164 | self.warnIfNonClass(subscriber) 165 | if options.contains(.warnUnknown) { 166 | self.warnIfUnknown(eventType) 167 | } 168 | self.lock.with { 169 | self.updateSubscribers(for: eventType) { subscribed in 170 | subscribed.insert(WeakBox(subscriber as AnyObject)) 171 | } 172 | } 173 | } 174 | 175 | public func remove(subscriber: T, for eventType: T.Type) { 176 | return self.remove(subscriber: subscriber, for: eventType, options: self.options) 177 | } 178 | 179 | public func remove(subscriber: T, for eventType: T.Type, options: Options) { 180 | self.warnIfNonClass(subscriber) 181 | if options.contains(.warnUnknown) { 182 | self.warnIfUnknown(eventType) 183 | } 184 | self.lock.with { 185 | self.updateSubscribers(for: eventType) { subscribed in 186 | while let index = subscribed.index(where: { $0 == (subscriber as AnyObject) }) { 187 | subscribed.remove(at: index) 188 | } 189 | } 190 | } 191 | } 192 | 193 | public func remove(subscriber: T) { 194 | return self.remove(subscriber: subscriber, options: self.options) 195 | } 196 | 197 | public func remove(subscriber: T, options: Options) { 198 | self.warnIfNonClass(subscriber) 199 | self.lock.with { 200 | for (identifier, subscribed) in self.subscribed { 201 | self.subscribed[identifier] = self.update(set: subscribed) { subscribed in 202 | while let index = subscribed.index(where: { $0 == (subscriber as AnyObject) }) { 203 | subscribed.remove(at: index) 204 | } 205 | } 206 | } 207 | } 208 | } 209 | 210 | public func removeAllSubscribers() { 211 | self.lock.with { 212 | self.subscribed = [:] 213 | } 214 | } 215 | 216 | internal func has(subscriber: T, for eventType: T.Type) -> Bool { 217 | return self.has(subscriber: subscriber, for: eventType, options: self.options) 218 | } 219 | 220 | internal func has(subscriber: T, for eventType: T.Type, options: Options) -> Bool { 221 | self.warnIfNonClass(subscriber) 222 | if options.contains(.warnUnknown) { 223 | self.warnIfUnknown(eventType) 224 | } 225 | return self.lock.with { 226 | guard let subscribed = self.subscribed[ObjectIdentifier(eventType)] else { 227 | return false 228 | } 229 | return subscribed.contains { $0 == (subscriber as AnyObject) } 230 | } 231 | } 232 | } 233 | 234 | extension EventBus: EventNotifiable { 235 | @discardableResult 236 | public func notify(_ eventType: T.Type, closure: @escaping (T) -> ()) -> Bool { 237 | return self.notify(eventType, options: self.options, closure: closure) 238 | } 239 | 240 | @discardableResult 241 | public func notify(_ eventType: T.Type, options: Options, closure: @escaping (T) -> ()) -> Bool { 242 | if options.contains(.warnUnknown) { 243 | self.warnIfUnknown(eventType) 244 | } 245 | self.logEvent(eventType) 246 | return self.lock.with { 247 | var handled: Int = 0 248 | let identifier = ObjectIdentifier(eventType) 249 | // Notify our direct subscribers: 250 | if let subscribers = self.subscribed[identifier] { 251 | for subscriber in subscribers.lazy.compactMap({ $0.inner as? T }) { 252 | self.notificationQueue.async { 253 | closure(subscriber) 254 | } 255 | } 256 | handled += subscribers.count 257 | } 258 | // Notify our indirect subscribers: 259 | if let chains = self.chained[identifier] { 260 | for chain in chains.lazy.compactMap({ $0.inner as? EventNotifiable }) { 261 | handled += chain.notify(eventType, closure: closure) ? 1 : 0 262 | } 263 | } 264 | if (handled == 0) && options.contains(.warnUnhandled) { 265 | self.warnUnhandled(eventType) 266 | } 267 | return handled > 0 268 | } 269 | } 270 | } 271 | 272 | extension EventBus: EventChainable { 273 | public func attach(chain: EventNotifiable, for eventType: T.Type) { 274 | return self.attach(chain: chain, for: eventType, options: self.options) 275 | } 276 | 277 | public func attach(chain: EventNotifiable, for eventType: T.Type, options: Options) { 278 | if options.contains(.warnUnknown) { 279 | self.warnIfUnknown(eventType) 280 | } 281 | self.lock.with { 282 | self.updateChains(for: eventType) { chained in 283 | chained.insert(WeakBox(chain as AnyObject)) 284 | } 285 | } 286 | } 287 | 288 | public func detach(chain: EventNotifiable, for eventType: T.Type) { 289 | return self.detach(chain: chain, for: eventType, options: self.options) 290 | } 291 | 292 | public func detach(chain: EventNotifiable, for eventType: T.Type, options: Options) { 293 | if options.contains(.warnUnknown) { 294 | self.warnIfUnknown(eventType) 295 | } 296 | self.lock.with { 297 | self.updateChains(for: eventType) { chained in 298 | chained.remove(WeakBox(chain as AnyObject)) 299 | } 300 | } 301 | } 302 | 303 | public func detach(chain: EventNotifiable) { 304 | self.lock.with { 305 | for (identifier, chained) in self.chained { 306 | self.chained[identifier] = self.update(set: chained) { chained in 307 | chained.remove(WeakBox(chain as AnyObject)) 308 | } 309 | } 310 | } 311 | } 312 | 313 | public func detachAllChains() { 314 | self.lock.with { 315 | self.chained = [:] 316 | } 317 | } 318 | 319 | internal func has(chain: EventNotifiable, for eventType: T.Type) -> Bool { 320 | return self.has(chain: chain, for: eventType, options: self.options) 321 | } 322 | 323 | internal func has(chain: EventNotifiable, for eventType: T.Type, options: Options) -> Bool { 324 | if options.contains(.warnUnknown) { 325 | self.warnIfUnknown(eventType) 326 | } 327 | return self.lock.with { 328 | guard let chained = self.chained[ObjectIdentifier(eventType)] else { 329 | return false 330 | } 331 | return chained.contains { $0 == (chain as AnyObject) } 332 | } 333 | } 334 | } 335 | 336 | extension EventBus: CustomStringConvertible { 337 | public var description: String { 338 | var mutableSelf = self 339 | return Swift.withUnsafePointer(to: &mutableSelf) { pointer in 340 | let name = String(describing: type(of: self)) 341 | let address = String(format: "%p", pointer) 342 | let label = self.label.map { " \"\($0)\"" } ?? "" 343 | return "<\(name): \(address)\(label)>" 344 | } 345 | } 346 | } 347 | -------------------------------------------------------------------------------- /EventBus/EventChainable.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import Foundation 6 | 7 | /// A reduced type-erased interface for EventBus 8 | /// for selectively exposing its event-chaining capabilities. 9 | public protocol EventChainable: EventBusProtocol { 10 | /// Attaches a second event bus chained to the event bus. 11 | /// 12 | /// - Note: 13 | /// - Notified events on `self` get forwarded to chains attached for eventType. 14 | /// 15 | /// - Parameters 16 | /// - chain: the event bus to attach 17 | /// - eventType: the event type for which to attach the chain for 18 | /// 19 | /// ``` 20 | /// let eventBus = EventBus() 21 | /// let chainedEventBus = EventBus() 22 | /// // ... 23 | /// eventBus.attach(chain: chainedEventBus, for: MyEvent.self) 24 | /// ``` 25 | func attach(chain: EventNotifiable, for eventType: T.Type) 26 | 27 | /// Attaches a second event bus chained to the event bus. 28 | /// 29 | /// - Note: 30 | /// - Notified events on `self` get forwarded to chains attached for eventType. 31 | /// 32 | /// - Parameters 33 | /// - chain: the event bus to attach 34 | /// - eventType: the event type for which to attach the chain for 35 | /// - options: temporarily overwritten options for this call 36 | /// 37 | /// - SeeAlso: 38 | /// [attach(chain:for:)](EventBus.attach(chain:for:)) 39 | func attach(chain: EventNotifiable, for eventType: T.Type, options: Options) 40 | 41 | /// Detaches a chained event bus from the event bus for a given event type. 42 | /// 43 | /// - Parameters 44 | /// - chain: the event bus to attach 45 | /// - eventType: the event type for which to detach the chain from 46 | /// 47 | /// ``` 48 | /// let eventBus = EventBus() 49 | /// let chainedEventBus = EventBus() 50 | /// // ... 51 | /// eventBus.attach(chain: chainedEventBus, for: MyEvent.self) 52 | /// // ... 53 | /// eventBus.detach(chain: chainedEventBus, for: MyEvent.self) 54 | /// ``` 55 | func detach(chain: EventNotifiable, for eventType: T.Type) 56 | 57 | /// Detaches a chained event bus from the event bus for a given event type. 58 | /// 59 | /// - Parameters 60 | /// - chain: the event bus to attach 61 | /// - eventType: the event type for which to detach the chain from 62 | /// - options: temporarily overwritten options for this call 63 | /// 64 | /// - SeeAlso: 65 | /// [detach(chain:for:)](EventBus.detach(chain:for:)) 66 | func detach(chain: EventNotifiable, for eventType: T.Type, options: Options) 67 | 68 | /// Detaches a second event bus from the event bus. 69 | /// 70 | /// - Parameters 71 | /// - chain: the event bus to detach 72 | /// 73 | /// ``` 74 | /// let eventBus = EventBus() 75 | /// let chainedEventBus = EventBus() 76 | /// // ... 77 | /// eventBus.attach(chain: chainedEventBus, for: MyEvent.self) 78 | /// // ... 79 | /// eventBus.detach(chain: chainedEventBus) 80 | /// ``` 81 | func detach(chain: EventNotifiable) 82 | 83 | /// Detaches all attached event busses from the event bus. 84 | /// 85 | /// - Parameters 86 | /// - chain: the event bus to detach 87 | /// 88 | /// ``` 89 | /// let eventBus = EventBus() 90 | /// let chainedEventBus = EventBus() 91 | /// // ... 92 | /// eventBus.attach(chain: chainedEventBus) 93 | /// // ... 94 | /// eventBus.detachAllChains() 95 | func detachAllChains() 96 | } 97 | -------------------------------------------------------------------------------- /EventBus/EventNotifiable.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import Foundation 6 | 7 | /// A reduced type-erased interface for EventBus 8 | /// for selectively exposing its event-notification capabilities. 9 | public protocol EventNotifiable: EventBusProtocol { 10 | 11 | /// Notifies all subscribers (and chained event busses) 12 | /// 13 | /// - Parameters: 14 | /// - eventType: the event type for which to notify subscribers for 15 | /// - closure: the closure to perform on subscribers for the given event type 16 | /// 17 | /// ``` 18 | /// protocol MyEvent { 19 | /// func handle(value: Int) 20 | /// } 21 | /// 22 | /// let eventBus = EventBus() 23 | /// // ... 24 | /// eventBus.add(subscriber: subscriber, for: MyEvent.self) 25 | /// // ... 26 | /// eventBus.notify(MyEvent.self) { subscriber in 27 | /// subscriber.handle(value: 42) 28 | /// } 29 | /// ``` 30 | @discardableResult 31 | func notify(_ eventType: T.Type, closure: @escaping (T) -> ()) -> Bool 32 | 33 | /// Notifies all subscribers (and chained event busses) 34 | /// 35 | /// - Parameters: 36 | /// - eventType: the event type for which to notify subscribers for 37 | /// - options: temporarily overwritten options for this call 38 | /// - closure: the closure to perform on subscribers for the given event type 39 | /// 40 | /// - SeeAlso: 41 | /// [notify(_:closure:)](EventBus.notify(_:closure:)) 42 | @discardableResult 43 | func notify(_ eventType: T.Type, options: Options, closure: @escaping (T) -> ()) -> Bool 44 | } 45 | -------------------------------------------------------------------------------- /EventBus/EventRegistrable.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import Foundation 6 | 7 | /// A reduced type-erased interface for EventBus 8 | /// for selectively exposing its type-registration capabilities. 9 | public protocol EventRegistrable: EventBusProtocol { 10 | /// Registers a given event bus for a given event type. 11 | /// 12 | /// - Parameters: 13 | /// - eventType: the event type to register 14 | /// 15 | /// - Note: 16 | /// This only has an effect if the event bus 17 | /// has been initialized with the `Options.warnUnknown` flag. 18 | /// 19 | /// ``` 20 | /// protocol MyEvent { 21 | /// // ... 22 | /// } 23 | /// 24 | /// let eventBus = EventBus() 25 | /// eventBus.register(forEvent: MyEvent.self) 26 | /// ``` 27 | func register(forEvent eventType: T.Type) 28 | } 29 | -------------------------------------------------------------------------------- /EventBus/EventSubscribable.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import Foundation 6 | 7 | /// A reduced type-erased interface for EventBus 8 | /// for selectively exposing its event-subscription capabilities. 9 | public protocol EventSubscribable: EventBusProtocol { 10 | /// Adds a given object to the list of subscribers of a given event type on the event bus. 11 | /// 12 | /// - Parameters: 13 | /// - subscriber: the subscriber to add to the event bus for the given event type 14 | /// - eventType: the event type to subscribe for 15 | /// 16 | /// ``` 17 | /// protocol MyEvent { 18 | /// // ... 19 | /// } 20 | /// 21 | /// let eventBus = EventBus() 22 | /// // ... 23 | /// eventBus.add(subscriber: subscriber, for: MyEvent.self) 24 | /// ``` 25 | func add(subscriber: T, for eventType: T.Type) 26 | 27 | /// Adds a given object to the list of subscribers of a given event type on the event bus. 28 | /// 29 | /// - Parameters: 30 | /// - subscriber: the subscriber to add to the event bus for the given event type 31 | /// - eventType: the event type to subscribe for 32 | /// - options: temporarily overwritten options for this call 33 | /// 34 | /// - SeeAlso: 35 | /// [add(subscriber:for)](EventBus.add(subscriber:for:)) 36 | func add(subscriber: T, for eventType: T.Type, options: Options) 37 | 38 | /// Removes a given object from the list of subscribers of a given event type on the event bus. 39 | /// 40 | /// - Parameters: 41 | /// - subscriber: the subscriber to remove from the event bus for the given event type 42 | /// - eventType: the event type to unsubscribe from 43 | /// 44 | /// ``` 45 | /// protocol MyEvent { 46 | /// // ... 47 | /// } 48 | /// 49 | /// let eventBus = EventBus() 50 | /// // ... 51 | /// eventBus.add(subscriber: subscriber, for: MyEvent.self) 52 | /// // ... 53 | /// eventBus.remove(subscriber: subscriber, for: MyEvent.self) 54 | /// ``` 55 | func remove(subscriber: T, for eventType: T.Type) 56 | 57 | /// Removes a given object from the list of subscribers of a given event type on the event bus. 58 | /// 59 | /// - Parameters: 60 | /// - subscriber: the subscriber to remove from the event bus for the given event type 61 | /// - eventType: the event type to unsubscribe from 62 | /// - options: temporarily overwritten options for this call 63 | /// 64 | /// - SeeAlso: 65 | /// [remove(subscriber:for:)](EventBus.remove(subscriber:for:)) 66 | func remove(subscriber: T, for eventType: T.Type, options: Options) 67 | 68 | /// Removes a given object from the list of subscribers on the event bus. 69 | /// 70 | /// - Parameters: 71 | /// - subscriber: the subscriber to remove from the event bus for all event types 72 | /// 73 | /// ``` 74 | /// protocol MyEvent { 75 | /// // ... 76 | /// } 77 | /// 78 | /// let eventBus = EventBus() 79 | /// // ... 80 | /// eventBus.add(subscriber: subscriber, for: MyEvent.self) 81 | /// // ... 82 | /// eventBus.remove(subscriber: subscriber) 83 | /// ``` 84 | func remove(subscriber: T) 85 | 86 | /// Removes a given object from the list of subscribers on the event bus. 87 | /// 88 | /// - Parameters: 89 | /// - subscriber: the subscriber to remove from the event bus for all event types 90 | /// - options: temporarily overwritten options for this call 91 | /// 92 | /// - SeeAlso: 93 | /// [remove(subscriber:)](EventBus.remove(subscriber:)) 94 | /// ``` 95 | func remove(subscriber: T, options: Options) 96 | 97 | /// Removes all objects from the list of subscribers on the event bus. 98 | /// 99 | /// ``` 100 | /// protocol MyEvent { 101 | /// // ... 102 | /// } 103 | /// 104 | /// let eventBus = EventBus() 105 | /// // ... 106 | /// eventBus.add(subscriber: subscriber, for: MyEvent.self) 107 | /// // ... 108 | /// eventBus.removeAllSubscribers() 109 | /// ``` 110 | func removeAllSubscribers() 111 | } 112 | -------------------------------------------------------------------------------- /EventBus/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | $(PRODUCT_BUNDLE_IDENTIFIER) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | FMWK 17 | CFBundleShortVersionString 18 | 0.4.2 19 | CFBundleVersion 20 | $(CURRENT_PROJECT_VERSION) 21 | NSPrincipalClass 22 | 23 | 24 | 25 | -------------------------------------------------------------------------------- /EventBus/LogHandler.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import Foundation 6 | 7 | internal protocol LogHandler { 8 | func eventBus(_ eventBus: EventBus, receivedEvent: T.Type) 9 | } 10 | 11 | internal struct DefaultLogHandler: LogHandler { 12 | func eventBus(_ eventBus: EventBus, receivedEvent eventType: T.Type) { 13 | #if DEBUG 14 | print("\(eventBus): Received event '\(eventType)'.") 15 | #endif 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /EventBus/NSLocking+Extensions.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import Foundation 6 | 7 | protocol NSTryLocking: NSLocking { 8 | func `try`() -> Bool 9 | } 10 | 11 | extension NSLock: NSTryLocking {} 12 | extension NSConditionLock: NSTryLocking {} 13 | extension NSRecursiveLock: NSTryLocking {} 14 | 15 | extension NSLocking { 16 | public func with(closure: () -> T) -> T { 17 | self.lock() 18 | let result = closure() 19 | self.unlock() 20 | return result 21 | } 22 | } 23 | 24 | extension NSTryLocking { 25 | public func tryWith(closure: () -> T) -> T? { 26 | guard self.try() else { 27 | return nil 28 | } 29 | let result = closure() 30 | self.unlock() 31 | return result 32 | } 33 | } 34 | -------------------------------------------------------------------------------- /EventBus/Options.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import Foundation 6 | 7 | /// Options for configuring the behavior of a given EventBus. 8 | public struct Options: OptionSet { 9 | 10 | /// See protocol `OptionSet` 11 | public let rawValue: Int 12 | 13 | /// See protocol `OptionSet` 14 | public init(rawValue: Int) { 15 | self.rawValue = rawValue 16 | } 17 | 18 | /// Print a warning whenever an event gets subscribed to or notified that has not previously 19 | /// been registered (i.e. via `eventBus.register(forEvent: MyEvent.self)`) with the event bus. 20 | /// 21 | /// - Note: 22 | /// Warning logs are only emitted if the `DEBUG` compiler flag is present. 23 | /// 24 | /// By setting `EventBus.isStrict = true` you can catch the error using 25 | /// a "Swift Error Breakpoint" on type `StrictnessError`. 26 | /// ``` 27 | public static let warnUnknown = Options(rawValue: 1 << 0) 28 | 29 | /// Print a warning whenever an event gets subscribed to or notified that has not previously 30 | /// been registered (i.e. via `eventBus.register(forEvent: MyEvent.self)`) with the event bus. 31 | /// 32 | /// - Note: 33 | /// Warning logs are only emitted if the `DEBUG` compiler flag is present. 34 | /// 35 | /// By setting `EventBus.isStrict = true` you can catch the error using 36 | /// a "Swift Error Breakpoint" on type `StrictnessError`. 37 | /// ``` 38 | public static let warnUnhandled = Options(rawValue: 1 << 1) 39 | 40 | /// All available warnings: 41 | /// - `.warnUnknown` 42 | /// - `.warnUnhandled` 43 | public static var allWarnings: Options { 44 | return [.warnUnknown, .warnUnhandled] 45 | } 46 | 47 | /// Print a log of emitted events for a given event bus. 48 | public static let logEvents = Options(rawValue: 1 << 2) 49 | } 50 | -------------------------------------------------------------------------------- /EventBusTests/EventChainableTests.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import XCTest 6 | 7 | import Foundation 8 | @testable import EventBus 9 | 10 | class EventChainableTests: XCTestCase { 11 | func testAttachChain() { 12 | let rootEventBus = EventBus() 13 | let leafEventBus = EventBus() 14 | 15 | XCTAssertFalse(rootEventBus.has(chain: leafEventBus, for: FooStubable.self)) 16 | rootEventBus.attach(chain: leafEventBus, for: FooStubable.self) 17 | XCTAssertTrue(rootEventBus.has(chain: leafEventBus, for: FooStubable.self)) 18 | } 19 | 20 | func testDetachChain() { 21 | let rootEventBus = EventBus() 22 | let leafEventBus = EventBus() 23 | rootEventBus.attach(chain: leafEventBus, for: FooStubable.self) 24 | 25 | XCTAssertTrue(rootEventBus.has(chain: leafEventBus, for: FooStubable.self)) 26 | rootEventBus.detach(chain: leafEventBus) 27 | XCTAssertFalse(rootEventBus.has(chain: leafEventBus, for: FooStubable.self)) 28 | } 29 | 30 | func testDetachAllChains() { 31 | let rootEventBus = EventBus() 32 | let leafEventBusA = EventBus() 33 | let leafEventBusB = EventBus() 34 | rootEventBus.attach(chain: leafEventBusA, for: FooStubable.self) 35 | rootEventBus.attach(chain: leafEventBusB, for: FooStubable.self) 36 | 37 | XCTAssertTrue(rootEventBus.has(chain: leafEventBusA, for: FooStubable.self)) 38 | XCTAssertTrue(rootEventBus.has(chain: leafEventBusB, for: FooStubable.self)) 39 | rootEventBus.detachAllChains() 40 | XCTAssertFalse(rootEventBus.has(chain: leafEventBusA, for: FooStubable.self)) 41 | XCTAssertFalse(rootEventBus.has(chain: leafEventBusB, for: FooStubable.self)) 42 | } 43 | 44 | func testNotifyNotifiesChains() { 45 | let notifiedExpectation = self.expectation(description: "") 46 | let ignoredExpectation = self.expectation(description: "") 47 | ignoredExpectation.isInverted = true 48 | 49 | let notifiedFooMock = FooMock { _ in notifiedExpectation.fulfill() } 50 | let ignoredBarMock = BarMock { _ in ignoredExpectation.fulfill() } 51 | 52 | let rootEventBus = EventBus() 53 | let notifiedLeafEventBus = EventBus() 54 | let ignoredLeafEventBus = EventBus() 55 | 56 | rootEventBus.attach(chain: notifiedLeafEventBus, for: FooMockable.self) 57 | rootEventBus.attach(chain: ignoredLeafEventBus, for: BarMockable.self) 58 | 59 | notifiedLeafEventBus.add(subscriber: notifiedFooMock, for: FooMockable.self) 60 | ignoredLeafEventBus.add(subscriber: ignoredBarMock, for: BarMockable.self) 61 | 62 | rootEventBus.notify(FooMockable.self) { subscriber in 63 | subscriber.foo() 64 | } 65 | 66 | self.waitForExpectations(timeout: 1.0) 67 | } 68 | } 69 | -------------------------------------------------------------------------------- /EventBusTests/EventNotifiableTests.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import XCTest 6 | 7 | import Foundation 8 | @testable import EventBus 9 | 10 | class EventNotifiableTests: XCTestCase { 11 | func testNotifyNotifiesRelatedSubscribers() { 12 | let expectation = self.expectation(description: "") 13 | 14 | let fooMock = FooMock { _ in expectation.fulfill() } 15 | 16 | let eventBus = EventBus() 17 | eventBus.add(subscriber: fooMock, for: FooMockable.self) 18 | eventBus.notify(FooMockable.self) { subscriber in 19 | subscriber.foo() 20 | } 21 | 22 | self.waitForExpectations(timeout: 1.0) 23 | } 24 | 25 | func testNotifyNotifiesIgnoresUnrelatedSubscribers() { 26 | let expectation = self.expectation(description: "") 27 | expectation.isInverted = true 28 | 29 | let fooMock = FooMock { _ in expectation.fulfill() } 30 | 31 | let eventBus = EventBus() 32 | eventBus.add(subscriber: fooMock, for: FooMockable.self) 33 | eventBus.notify(BarMockable.self) { subscriber in 34 | subscriber.bar() 35 | } 36 | 37 | self.waitForExpectations(timeout: 1.0) 38 | } 39 | 40 | func testNotifyNotifiesIgnoresUnrelatedSubscribers_() { 41 | let expectation = self.expectation(description: "") 42 | 43 | let fooBarMock = FooBarMock { event in 44 | switch event { 45 | case .foo: expectation.fulfill() 46 | case _: XCTFail("Should not have called `BarMockable` on subscriber") 47 | } 48 | } 49 | 50 | let eventBus = EventBus() 51 | eventBus.add(subscriber: fooBarMock, for: FooMockable.self) 52 | eventBus.notify(FooMockable.self) { subscriber in 53 | subscriber.foo() 54 | } 55 | 56 | self.waitForExpectations(timeout: 1.0) 57 | } 58 | 59 | func testNotifyOnUnknownEventEmitsError() { 60 | let expectation = self.expectation(description: "") 61 | 62 | let errorHandlerMock = ErrorHandlerMock { error in 63 | switch error { 64 | case .unknownEvent: expectation.fulfill() 65 | case _: XCTFail("Should not have emitted `.unknownEvent` on handler") 66 | } 67 | } 68 | 69 | let eventBus = EventBus(options: .warnUnknown) 70 | eventBus.register(forEvent: BarMockable.self) 71 | eventBus.errorHandler = errorHandlerMock 72 | eventBus.notify(FooMockable.self) { _ in } 73 | 74 | self.waitForExpectations(timeout: 1.0) 75 | } 76 | 77 | func testDropOnNotifiedEventEmitsError() { 78 | let expectation = self.expectation(description: "") 79 | 80 | let errorHandlerMock = ErrorHandlerMock { error in 81 | switch error { 82 | case .unhandledEvent: expectation.fulfill() 83 | case _: XCTFail("Should not have emitted `.unhandledEvent` on handler") 84 | } 85 | } 86 | 87 | let eventBus = EventBus(options: .warnUnhandled) 88 | eventBus.errorHandler = errorHandlerMock 89 | eventBus.notify(FooMockable.self) { _ in } 90 | 91 | self.waitForExpectations(timeout: 1.0) 92 | } 93 | 94 | func testNotifyEmitsLog() { 95 | let expectation = self.expectation(description: "") 96 | 97 | let logHandler = LogHandlerMock { 98 | expectation.fulfill() 99 | } 100 | 101 | let eventBus = EventBus(options: .logEvents) 102 | eventBus.logHandler = logHandler 103 | 104 | eventBus.notify(FooMockable.self) { subscriber in 105 | subscriber.foo() 106 | } 107 | 108 | self.waitForExpectations(timeout: 1.0) 109 | } 110 | } 111 | -------------------------------------------------------------------------------- /EventBusTests/EventSubscribableTests.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import XCTest 6 | 7 | import Foundation 8 | @testable import EventBus 9 | 10 | class EventSubscribableTests: XCTestCase { 11 | 12 | func testAddingSubscriberWithoutRelatedSibling() { 13 | let fooStub = FooStub() 14 | 15 | let eventBus = EventBus() 16 | XCTAssertFalse(eventBus.has(subscriber: fooStub, for: FooStubable.self)) 17 | 18 | eventBus.add(subscriber: fooStub, for: FooStubable.self) 19 | XCTAssertTrue(eventBus.has(subscriber: fooStub, for: FooStubable.self)) 20 | } 21 | 22 | func testAddingSubscriberWithRelatedSibling() { 23 | let fooStubA = FooStub() 24 | let fooStubB = FooStub() 25 | 26 | let eventBus = EventBus() 27 | eventBus.add(subscriber: fooStubA, for: FooStubable.self) 28 | XCTAssertFalse(eventBus.has(subscriber: fooStubB, for: FooStubable.self)) 29 | 30 | eventBus.add(subscriber: fooStubB, for: FooStubable.self) 31 | XCTAssertTrue(eventBus.has(subscriber: fooStubB, for: FooStubable.self)) 32 | } 33 | 34 | func testAddingSubscriberWithUnrelatedSibling() { 35 | let fooStub = FooStub() 36 | let barStub = BarStub() 37 | 38 | let eventBus = EventBus() 39 | eventBus.add(subscriber: fooStub, for: FooStubable.self) 40 | XCTAssertTrue(eventBus.has(subscriber: fooStub, for: FooStubable.self)) 41 | XCTAssertFalse(eventBus.has(subscriber: barStub, for: BarStubable.self)) 42 | 43 | eventBus.add(subscriber: barStub, for: BarStubable.self) 44 | XCTAssertTrue(eventBus.has(subscriber: fooStub, for: FooStubable.self)) 45 | XCTAssertTrue(eventBus.has(subscriber: barStub, for: BarStubable.self)) 46 | } 47 | 48 | func testAddingSubscriberWithMultipleConformances() { 49 | let fooBarStub = FooBarStub() 50 | 51 | let eventBus = EventBus() 52 | eventBus.add(subscriber: fooBarStub, for: FooStubable.self) 53 | XCTAssertTrue(eventBus.has(subscriber: fooBarStub, for: FooStubable.self)) 54 | XCTAssertFalse(eventBus.has(subscriber: fooBarStub, for: BarStubable.self)) 55 | 56 | eventBus.add(subscriber: fooBarStub, for: BarStubable.self) 57 | XCTAssertTrue(eventBus.has(subscriber: fooBarStub, for: FooStubable.self)) 58 | XCTAssertTrue(eventBus.has(subscriber: fooBarStub, for: BarStubable.self)) 59 | } 60 | 61 | func testRemovingSubscriberWithoutRelatedSibling() { 62 | let fooStub = FooStub() 63 | 64 | let eventBus = EventBus() 65 | eventBus.add(subscriber: fooStub, for: FooStubable.self) 66 | XCTAssertTrue(eventBus.has(subscriber: fooStub, for: FooStubable.self)) 67 | 68 | eventBus.remove(subscriber: fooStub, for: FooStubable.self) 69 | XCTAssertFalse(eventBus.has(subscriber: fooStub, for: FooStubable.self)) 70 | } 71 | 72 | func testRemovingSubscriberWithRelatedSibling() { 73 | let fooStubA = FooStub() 74 | let fooStubB = FooStub() 75 | 76 | let eventBus = EventBus() 77 | eventBus.add(subscriber: fooStubA, for: FooStubable.self) 78 | eventBus.add(subscriber: fooStubB, for: FooStubable.self) 79 | XCTAssertTrue(eventBus.has(subscriber: fooStubA, for: FooStubable.self)) 80 | XCTAssertTrue(eventBus.has(subscriber: fooStubB, for: FooStubable.self)) 81 | 82 | eventBus.remove(subscriber: fooStubA, for: FooStubable.self) 83 | XCTAssertFalse(eventBus.has(subscriber: fooStubA, for: FooStubable.self)) 84 | XCTAssertTrue(eventBus.has(subscriber: fooStubB, for: FooStubable.self)) 85 | } 86 | 87 | func testRemovingSubscriberWithUnrelatedSibling() { 88 | let fooStub = FooStub() 89 | let barStub = BarStub() 90 | 91 | let eventBus = EventBus() 92 | eventBus.add(subscriber: fooStub, for: FooStubable.self) 93 | XCTAssertTrue(eventBus.has(subscriber: fooStub, for: FooStubable.self)) 94 | XCTAssertFalse(eventBus.has(subscriber: barStub, for: BarStubable.self)) 95 | 96 | eventBus.add(subscriber: barStub, for: BarStubable.self) 97 | XCTAssertTrue(eventBus.has(subscriber: fooStub, for: FooStubable.self)) 98 | XCTAssertTrue(eventBus.has(subscriber: barStub, for: BarStubable.self)) 99 | } 100 | 101 | func testRemovingSubscriberWithMultipleConformancesIndividually() { 102 | let fooBarStub = FooBarStub() 103 | 104 | let eventBus = EventBus() 105 | eventBus.add(subscriber: fooBarStub, for: FooStubable.self) 106 | eventBus.add(subscriber: fooBarStub, for: BarStubable.self) 107 | XCTAssertTrue(eventBus.has(subscriber: fooBarStub, for: FooStubable.self)) 108 | XCTAssertTrue(eventBus.has(subscriber: fooBarStub, for: BarStubable.self)) 109 | 110 | eventBus.remove(subscriber: fooBarStub, for: FooStubable.self) 111 | XCTAssertFalse(eventBus.has(subscriber: fooBarStub, for: FooStubable.self)) 112 | XCTAssertTrue(eventBus.has(subscriber: fooBarStub, for: BarStubable.self)) 113 | } 114 | 115 | func testRemovingSubscriberWithMultipleConformancesBroadly() { 116 | let fooBarStub = FooBarStub() 117 | 118 | let eventBus = EventBus() 119 | eventBus.add(subscriber: fooBarStub, for: FooStubable.self) 120 | eventBus.add(subscriber: fooBarStub, for: BarStubable.self) 121 | 122 | XCTAssertTrue(eventBus.has(subscriber: fooBarStub, for: FooStubable.self)) 123 | XCTAssertTrue(eventBus.has(subscriber: fooBarStub, for: BarStubable.self)) 124 | 125 | eventBus.remove(subscriber: fooBarStub) 126 | XCTAssertFalse(eventBus.has(subscriber: fooBarStub, for: FooStubable.self)) 127 | XCTAssertFalse(eventBus.has(subscriber: fooBarStub, for: BarStubable.self)) 128 | } 129 | 130 | func testAddingNonClassSubscriberToEventEmitsError() { 131 | let expectation = self.expectation(description: "") 132 | 133 | let errorHandlerMock = ErrorHandlerMock { error in 134 | switch error { 135 | case .invalidSubscriber: expectation.fulfill() 136 | case _: XCTFail("Should not have emitted `.invalidSubscriber` on handler") 137 | } 138 | } 139 | 140 | let eventBus = EventBus() 141 | eventBus.errorHandler = errorHandlerMock 142 | eventBus.add(subscriber: InvalidFooStub(), for: FooStubable.self) 143 | 144 | self.waitForExpectations(timeout: 1.0) 145 | } 146 | 147 | func testRemovingNonClassSubscriberFromEventEmitsError() { 148 | let expectation = self.expectation(description: "") 149 | 150 | let errorHandlerMock = ErrorHandlerMock { error in 151 | switch error { 152 | case .invalidSubscriber: expectation.fulfill() 153 | case _: XCTFail("Should not have emitted `.invalidSubscriber` on handler") 154 | } 155 | } 156 | 157 | let eventBus = EventBus() 158 | eventBus.errorHandler = errorHandlerMock 159 | eventBus.remove(subscriber: InvalidFooStub(), for: FooStubable.self) 160 | 161 | self.waitForExpectations(timeout: 1.0) 162 | } 163 | 164 | func testRemovingNonClassSubscriberEmitsError() { 165 | let expectation = self.expectation(description: "") 166 | 167 | let errorHandlerMock = ErrorHandlerMock { error in 168 | switch error { 169 | case .invalidSubscriber: expectation.fulfill() 170 | case _: XCTFail("Should not have emitted `.invalidSubscriber` on handler") 171 | } 172 | } 173 | 174 | let eventBus = EventBus() 175 | eventBus.errorHandler = errorHandlerMock 176 | eventBus.remove(subscriber: InvalidFooStub()) 177 | 178 | self.waitForExpectations(timeout: 1.0) 179 | } 180 | 181 | func testSubscriptionOfUnknownEventEmitsError() { 182 | let expectation = self.expectation(description: "") 183 | 184 | let fooStub = FooStub() 185 | 186 | let errorHandlerMock = ErrorHandlerMock { error in 187 | switch error { 188 | case .unknownEvent: expectation.fulfill() 189 | case _: XCTFail("Should not have emitted `.unknownEvent` on handler") 190 | } 191 | } 192 | 193 | let eventBus = EventBus(options: .warnUnknown) 194 | eventBus.register(forEvent: BarMockable.self) 195 | eventBus.errorHandler = errorHandlerMock 196 | eventBus.add(subscriber: fooStub, for: FooStubable.self) 197 | 198 | self.waitForExpectations(timeout: 1.0) 199 | } 200 | } 201 | -------------------------------------------------------------------------------- /EventBusTests/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | $(PRODUCT_BUNDLE_IDENTIFIER) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | BNDL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleVersion 20 | 1 21 | 22 | 23 | -------------------------------------------------------------------------------- /EventBusTests/Utilities.swift: -------------------------------------------------------------------------------- 1 | // This Source Code Form is subject to the terms of the Mozilla Public 2 | // License, v. 2.0. If a copy of the MPL was not distributed with this 3 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 | 5 | import Foundation 6 | 7 | @testable import EventBus 8 | 9 | protocol FooStubable {} 10 | protocol BarStubable {} 11 | 12 | class FooStub: FooStubable {} 13 | class BarStub: BarStubable {} 14 | class FooBarStub: FooStubable, BarStubable {} 15 | 16 | enum MockEvent { case foo, bar } 17 | 18 | protocol FooMockable { func foo() } 19 | protocol BarMockable { func bar() } 20 | 21 | class Mock { 22 | fileprivate let closure: (MockEvent) -> () 23 | 24 | init(closure: ((MockEvent) -> ())? = nil) { 25 | self.closure = closure ?? { _ in } 26 | } 27 | } 28 | 29 | struct InvalidFooStub: FooStubable {} 30 | 31 | class FooMock: Mock, FooMockable { 32 | func foo() { self.closure(.foo) } 33 | } 34 | 35 | class BarMock: Mock, BarMockable { 36 | func bar() { self.closure(.bar) } 37 | } 38 | 39 | class FooBarMock: Mock, FooMockable, BarMockable { 40 | func foo() { self.closure(.foo) } 41 | func bar() { self.closure(.bar) } 42 | } 43 | 44 | enum MockError { case unknownEvent, unhandledEvent, invalidSubscriber } 45 | 46 | class ErrorHandlerMock: ErrorHandler { 47 | fileprivate let closure: (MockError) -> () 48 | 49 | init(closure: ((MockError) -> ())? = nil) { 50 | self.closure = closure ?? { _ in } 51 | } 52 | 53 | func eventBus(_ eventBus: EventBus, receivedUnknownEvent eventType: T.Type) { 54 | self.closure(.unknownEvent) 55 | } 56 | 57 | func eventBus(_ eventBus: EventBus, droppedUnhandledEvent eventType: T.Type) { 58 | self.closure(.unhandledEvent) 59 | } 60 | 61 | func eventBus(_ eventBus: EventBus, receivedNonClassSubscriber subscriberType: T.Type) { 62 | self.closure(.invalidSubscriber) 63 | } 64 | } 65 | 66 | class LogHandlerMock: LogHandler { 67 | fileprivate let closure: () -> () 68 | 69 | init(closure: (() -> ())? = nil) { 70 | self.closure = closure ?? { } 71 | } 72 | 73 | func eventBus(_ eventBus: EventBus, receivedEvent eventType: T.Type) { 74 | self.closure() 75 | } 76 | } 77 | -------------------------------------------------------------------------------- /Icon.sketch: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/regexident/EventBus/7ae8f64e56878b4e834c94276202d20db3daff9a/Icon.sketch -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Mozilla Public License Version 2.0 2 | ================================== 3 | 4 | 1. Definitions 5 | -------------- 6 | 7 | 1.1. "Contributor" 8 | means each individual or legal entity that creates, contributes to 9 | the creation of, or owns Covered Software. 10 | 11 | 1.2. "Contributor Version" 12 | means the combination of the Contributions of others (if any) used 13 | by a Contributor and that particular Contributor's Contribution. 14 | 15 | 1.3. "Contribution" 16 | means Covered Software of a particular Contributor. 17 | 18 | 1.4. "Covered Software" 19 | means Source Code Form to which the initial Contributor has attached 20 | the notice in Exhibit A, the Executable Form of such Source Code 21 | Form, and Modifications of such Source Code Form, in each case 22 | including portions thereof. 23 | 24 | 1.5. "Incompatible With Secondary Licenses" 25 | means 26 | 27 | (a) that the initial Contributor has attached the notice described 28 | in Exhibit B to the Covered Software; or 29 | 30 | (b) that the Covered Software was made available under the terms of 31 | version 1.1 or earlier of the License, but not also under the 32 | terms of a Secondary License. 33 | 34 | 1.6. "Executable Form" 35 | means any form of the work other than Source Code Form. 36 | 37 | 1.7. "Larger Work" 38 | means a work that combines Covered Software with other material, in 39 | a separate file or files, that is not Covered Software. 40 | 41 | 1.8. "License" 42 | means this document. 43 | 44 | 1.9. "Licensable" 45 | means having the right to grant, to the maximum extent possible, 46 | whether at the time of the initial grant or subsequently, any and 47 | all of the rights conveyed by this License. 48 | 49 | 1.10. "Modifications" 50 | means any of the following: 51 | 52 | (a) any file in Source Code Form that results from an addition to, 53 | deletion from, or modification of the contents of Covered 54 | Software; or 55 | 56 | (b) any new file in Source Code Form that contains any Covered 57 | Software. 58 | 59 | 1.11. "Patent Claims" of a Contributor 60 | means any patent claim(s), including without limitation, method, 61 | process, and apparatus claims, in any patent Licensable by such 62 | Contributor that would be infringed, but for the grant of the 63 | License, by the making, using, selling, offering for sale, having 64 | made, import, or transfer of either its Contributions or its 65 | Contributor Version. 66 | 67 | 1.12. "Secondary License" 68 | means either the GNU General Public License, Version 2.0, the GNU 69 | Lesser General Public License, Version 2.1, the GNU Affero General 70 | Public License, Version 3.0, or any later versions of those 71 | licenses. 72 | 73 | 1.13. "Source Code Form" 74 | means the form of the work preferred for making modifications. 75 | 76 | 1.14. "You" (or "Your") 77 | means an individual or a legal entity exercising rights under this 78 | License. For legal entities, "You" includes any entity that 79 | controls, is controlled by, or is under common control with You. For 80 | purposes of this definition, "control" means (a) the power, direct 81 | or indirect, to cause the direction or management of such entity, 82 | whether by contract or otherwise, or (b) ownership of more than 83 | fifty percent (50%) of the outstanding shares or beneficial 84 | ownership of such entity. 85 | 86 | 2. License Grants and Conditions 87 | -------------------------------- 88 | 89 | 2.1. Grants 90 | 91 | Each Contributor hereby grants You a world-wide, royalty-free, 92 | non-exclusive license: 93 | 94 | (a) under intellectual property rights (other than patent or trademark) 95 | Licensable by such Contributor to use, reproduce, make available, 96 | modify, display, perform, distribute, and otherwise exploit its 97 | Contributions, either on an unmodified basis, with Modifications, or 98 | as part of a Larger Work; and 99 | 100 | (b) under Patent Claims of such Contributor to make, use, sell, offer 101 | for sale, have made, import, and otherwise transfer either its 102 | Contributions or its Contributor Version. 103 | 104 | 2.2. Effective Date 105 | 106 | The licenses granted in Section 2.1 with respect to any Contribution 107 | become effective for each Contribution on the date the Contributor first 108 | distributes such Contribution. 109 | 110 | 2.3. Limitations on Grant Scope 111 | 112 | The licenses granted in this Section 2 are the only rights granted under 113 | this License. No additional rights or licenses will be implied from the 114 | distribution or licensing of Covered Software under this License. 115 | Notwithstanding Section 2.1(b) above, no patent license is granted by a 116 | Contributor: 117 | 118 | (a) for any code that a Contributor has removed from Covered Software; 119 | or 120 | 121 | (b) for infringements caused by: (i) Your and any other third party's 122 | modifications of Covered Software, or (ii) the combination of its 123 | Contributions with other software (except as part of its Contributor 124 | Version); or 125 | 126 | (c) under Patent Claims infringed by Covered Software in the absence of 127 | its Contributions. 128 | 129 | This License does not grant any rights in the trademarks, service marks, 130 | or logos of any Contributor (except as may be necessary to comply with 131 | the notice requirements in Section 3.4). 132 | 133 | 2.4. Subsequent Licenses 134 | 135 | No Contributor makes additional grants as a result of Your choice to 136 | distribute the Covered Software under a subsequent version of this 137 | License (see Section 10.2) or under the terms of a Secondary License (if 138 | permitted under the terms of Section 3.3). 139 | 140 | 2.5. Representation 141 | 142 | Each Contributor represents that the Contributor believes its 143 | Contributions are its original creation(s) or it has sufficient rights 144 | to grant the rights to its Contributions conveyed by this License. 145 | 146 | 2.6. Fair Use 147 | 148 | This License is not intended to limit any rights You have under 149 | applicable copyright doctrines of fair use, fair dealing, or other 150 | equivalents. 151 | 152 | 2.7. Conditions 153 | 154 | Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted 155 | in Section 2.1. 156 | 157 | 3. Responsibilities 158 | ------------------- 159 | 160 | 3.1. Distribution of Source Form 161 | 162 | All distribution of Covered Software in Source Code Form, including any 163 | Modifications that You create or to which You contribute, must be under 164 | the terms of this License. You must inform recipients that the Source 165 | Code Form of the Covered Software is governed by the terms of this 166 | License, and how they can obtain a copy of this License. You may not 167 | attempt to alter or restrict the recipients' rights in the Source Code 168 | Form. 169 | 170 | 3.2. Distribution of Executable Form 171 | 172 | If You distribute Covered Software in Executable Form then: 173 | 174 | (a) such Covered Software must also be made available in Source Code 175 | Form, as described in Section 3.1, and You must inform recipients of 176 | the Executable Form how they can obtain a copy of such Source Code 177 | Form by reasonable means in a timely manner, at a charge no more 178 | than the cost of distribution to the recipient; and 179 | 180 | (b) You may distribute such Executable Form under the terms of this 181 | License, or sublicense it under different terms, provided that the 182 | license for the Executable Form does not attempt to limit or alter 183 | the recipients' rights in the Source Code Form under this License. 184 | 185 | 3.3. Distribution of a Larger Work 186 | 187 | You may create and distribute a Larger Work under terms of Your choice, 188 | provided that You also comply with the requirements of this License for 189 | the Covered Software. If the Larger Work is a combination of Covered 190 | Software with a work governed by one or more Secondary Licenses, and the 191 | Covered Software is not Incompatible With Secondary Licenses, this 192 | License permits You to additionally distribute such Covered Software 193 | under the terms of such Secondary License(s), so that the recipient of 194 | the Larger Work may, at their option, further distribute the Covered 195 | Software under the terms of either this License or such Secondary 196 | License(s). 197 | 198 | 3.4. Notices 199 | 200 | You may not remove or alter the substance of any license notices 201 | (including copyright notices, patent notices, disclaimers of warranty, 202 | or limitations of liability) contained within the Source Code Form of 203 | the Covered Software, except that You may alter any license notices to 204 | the extent required to remedy known factual inaccuracies. 205 | 206 | 3.5. Application of Additional Terms 207 | 208 | You may choose to offer, and to charge a fee for, warranty, support, 209 | indemnity or liability obligations to one or more recipients of Covered 210 | Software. However, You may do so only on Your own behalf, and not on 211 | behalf of any Contributor. You must make it absolutely clear that any 212 | such warranty, support, indemnity, or liability obligation is offered by 213 | You alone, and You hereby agree to indemnify every Contributor for any 214 | liability incurred by such Contributor as a result of warranty, support, 215 | indemnity or liability terms You offer. You may include additional 216 | disclaimers of warranty and limitations of liability specific to any 217 | jurisdiction. 218 | 219 | 4. Inability to Comply Due to Statute or Regulation 220 | --------------------------------------------------- 221 | 222 | If it is impossible for You to comply with any of the terms of this 223 | License with respect to some or all of the Covered Software due to 224 | statute, judicial order, or regulation then You must: (a) comply with 225 | the terms of this License to the maximum extent possible; and (b) 226 | describe the limitations and the code they affect. Such description must 227 | be placed in a text file included with all distributions of the Covered 228 | Software under this License. Except to the extent prohibited by statute 229 | or regulation, such description must be sufficiently detailed for a 230 | recipient of ordinary skill to be able to understand it. 231 | 232 | 5. Termination 233 | -------------- 234 | 235 | 5.1. The rights granted under this License will terminate automatically 236 | if You fail to comply with any of its terms. However, if You become 237 | compliant, then the rights granted under this License from a particular 238 | Contributor are reinstated (a) provisionally, unless and until such 239 | Contributor explicitly and finally terminates Your grants, and (b) on an 240 | ongoing basis, if such Contributor fails to notify You of the 241 | non-compliance by some reasonable means prior to 60 days after You have 242 | come back into compliance. Moreover, Your grants from a particular 243 | Contributor are reinstated on an ongoing basis if such Contributor 244 | notifies You of the non-compliance by some reasonable means, this is the 245 | first time You have received notice of non-compliance with this License 246 | from such Contributor, and You become compliant prior to 30 days after 247 | Your receipt of the notice. 248 | 249 | 5.2. If You initiate litigation against any entity by asserting a patent 250 | infringement claim (excluding declaratory judgment actions, 251 | counter-claims, and cross-claims) alleging that a Contributor Version 252 | directly or indirectly infringes any patent, then the rights granted to 253 | You by any and all Contributors for the Covered Software under Section 254 | 2.1 of this License shall terminate. 255 | 256 | 5.3. In the event of termination under Sections 5.1 or 5.2 above, all 257 | end user license agreements (excluding distributors and resellers) which 258 | have been validly granted by You or Your distributors under this License 259 | prior to termination shall survive termination. 260 | 261 | ************************************************************************ 262 | * * 263 | * 6. Disclaimer of Warranty * 264 | * ------------------------- * 265 | * * 266 | * Covered Software is provided under this License on an "as is" * 267 | * basis, without warranty of any kind, either expressed, implied, or * 268 | * statutory, including, without limitation, warranties that the * 269 | * Covered Software is free of defects, merchantable, fit for a * 270 | * particular purpose or non-infringing. The entire risk as to the * 271 | * quality and performance of the Covered Software is with You. * 272 | * Should any Covered Software prove defective in any respect, You * 273 | * (not any Contributor) assume the cost of any necessary servicing, * 274 | * repair, or correction. This disclaimer of warranty constitutes an * 275 | * essential part of this License. No use of any Covered Software is * 276 | * authorized under this License except under this disclaimer. * 277 | * * 278 | ************************************************************************ 279 | 280 | ************************************************************************ 281 | * * 282 | * 7. Limitation of Liability * 283 | * -------------------------- * 284 | * * 285 | * Under no circumstances and under no legal theory, whether tort * 286 | * (including negligence), contract, or otherwise, shall any * 287 | * Contributor, or anyone who distributes Covered Software as * 288 | * permitted above, be liable to You for any direct, indirect, * 289 | * special, incidental, or consequential damages of any character * 290 | * including, without limitation, damages for lost profits, loss of * 291 | * goodwill, work stoppage, computer failure or malfunction, or any * 292 | * and all other commercial damages or losses, even if such party * 293 | * shall have been informed of the possibility of such damages. This * 294 | * limitation of liability shall not apply to liability for death or * 295 | * personal injury resulting from such party's negligence to the * 296 | * extent applicable law prohibits such limitation. Some * 297 | * jurisdictions do not allow the exclusion or limitation of * 298 | * incidental or consequential damages, so this exclusion and * 299 | * limitation may not apply to You. * 300 | * * 301 | ************************************************************************ 302 | 303 | 8. Litigation 304 | ------------- 305 | 306 | Any litigation relating to this License may be brought only in the 307 | courts of a jurisdiction where the defendant maintains its principal 308 | place of business and such litigation shall be governed by laws of that 309 | jurisdiction, without reference to its conflict-of-law provisions. 310 | Nothing in this Section shall prevent a party's ability to bring 311 | cross-claims or counter-claims. 312 | 313 | 9. Miscellaneous 314 | ---------------- 315 | 316 | This License represents the complete agreement concerning the subject 317 | matter hereof. If any provision of this License is held to be 318 | unenforceable, such provision shall be reformed only to the extent 319 | necessary to make it enforceable. Any law or regulation which provides 320 | that the language of a contract shall be construed against the drafter 321 | shall not be used to construe this License against a Contributor. 322 | 323 | 10. Versions of the License 324 | --------------------------- 325 | 326 | 10.1. New Versions 327 | 328 | Mozilla Foundation is the license steward. Except as provided in Section 329 | 10.3, no one other than the license steward has the right to modify or 330 | publish new versions of this License. Each version will be given a 331 | distinguishing version number. 332 | 333 | 10.2. Effect of New Versions 334 | 335 | You may distribute the Covered Software under the terms of the version 336 | of the License under which You originally received the Covered Software, 337 | or under the terms of any subsequent version published by the license 338 | steward. 339 | 340 | 10.3. Modified Versions 341 | 342 | If you create software not governed by this License, and you want to 343 | create a new license for such software, you may create and use a 344 | modified version of this License if you rename the license and remove 345 | any references to the name of the license steward (except to note that 346 | such modified license differs from this License). 347 | 348 | 10.4. Distributing Source Code Form that is Incompatible With Secondary 349 | Licenses 350 | 351 | If You choose to distribute Source Code Form that is Incompatible With 352 | Secondary Licenses under the terms of this version of the License, the 353 | notice described in Exhibit B of this License must be attached. 354 | 355 | Exhibit A - Source Code Form License Notice 356 | ------------------------------------------- 357 | 358 | This Source Code Form is subject to the terms of the Mozilla Public 359 | License, v. 2.0. If a copy of the MPL was not distributed with this 360 | file, You can obtain one at http://mozilla.org/MPL/2.0/. 361 | 362 | If it is not possible or desirable to put the notice in a particular 363 | file, then You may include the notice in a location (such as a LICENSE 364 | file in a relevant directory) where a recipient would be likely to look 365 | for such a notice. 366 | 367 | You may add additional accurate notices of copyright ownership. 368 | 369 | Exhibit B - "Incompatible With Secondary Licenses" Notice 370 | --------------------------------------------------------- 371 | 372 | This Source Code Form is "Incompatible With Secondary Licenses", as 373 | defined by the Mozilla Public License, v. 2.0. 374 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ![jumbotron](jumbotron.png) 2 | # EventBus 3 | 4 | **EventBus** is a safe-by-default alternative to Cocoa's `NSNotificationCenter`. It provides a **type-safe API** that can **safely** be used from **multiple threads**. It automagically removes subscribers when they are deallocated. 5 | 6 | EventBus is to **one-to-many notifications** what a `Delegate` is to one-to-one notifications. 7 | 8 | ![screencast](screencast.gif) 9 | 10 | ## Usage 11 | 12 | ### Simple Notifications: 13 | 14 | Let's say you have a lottery that's supposed to notify all its participating players every time a new winning number is drawn: 15 | 16 | ```swift 17 | import EventBus 18 | 19 | protocol LotteryDraw { 20 | func didDraw(number: Int, in: Lottery) 21 | } 22 | 23 | class Lottery { 24 | private let eventBus = EventBus() 25 | 26 | func add(player: LottoPlayer) { 27 | self.eventBus.add(subscriber: player, for: LotteryDraw.self) 28 | } 29 | 30 | func draw() { 31 | let winningNumber = arc4random() 32 | self.eventBus.notify(LotteryDraw.self) { subscriber in 33 | subscriber.didDraw(number: Int(winningNumber), in: self) 34 | } 35 | } 36 | } 37 | 38 | class LottoPlayer : LotteryDraw { 39 | func didDraw(number: Int, in: Lottery) { 40 | if number == 123456 { print("Hooray!") } 41 | } 42 | } 43 | ``` 44 | 45 | ### Complex Notifications: 46 | 47 | Nice, but what if you would like to group a set of **semantically related notifications** (such as different stages of a process) into a common protocol? No problem! Your protocol can be of **arbitrary complexity**. 48 | 49 | Consider this simple key-value-observing scenario: 50 | 51 | ```swift 52 | import EventBus 53 | 54 | protocol ValueChangeObserver { 55 | func willChangeValue(of: Publisher, from: Int, to: Int) 56 | func didChangeValue(of: Publisher, from: Int, to: Int) 57 | } 58 | 59 | class Publisher { 60 | private let eventBus = EventBus() 61 | 62 | var value: Int { 63 | willSet { 64 | self.eventBus.notify(ValueChangeObserver.self) { subscriber in 65 | subscriber.willChange(value: self.value, to: newValue) 66 | } 67 | } 68 | didSet { 69 | self.eventBus.notify(ValueChangeObserver.self) { subscriber in 70 | subscriber.didChange(value: oldValue, to: self.value) 71 | } 72 | } 73 | } 74 | 75 | func add(subscriber: ValueChangeObserver) { 76 | self.eventBus.add(subscriber: subscriber, for: ValueChangeObserver.self) 77 | } 78 | } 79 | 80 | class Subscriber : ValueChangeObserver { 81 | func willChangeValue(of: Publisher, from: Int, to: Int) { 82 | print("\(of) will change value from \(from) to \(to).") 83 | } 84 | 85 | func didChangeValue(of: Publisher, from: Int, to: Int) { 86 | print("\(of) did change value from \(from) to \(to).") 87 | } 88 | } 89 | ``` 90 | 91 | ### Chaining 92 | 93 | Sometimes it is desirable to have one event bus forward a carbon copy of all of its events to a second event bus. A possible scenario would be a proxy event bus that acts as a centralized facade to an arbitrary number of internal event buses. 94 | 95 | ```swift 96 | let proxyEventBus = EventBus() 97 | 98 | let eventBus1 = EventBus() 99 | let eventBus2 = EventBus() 100 | proxyEventBus.attach(chain: eventBus1, for SomeEvent.self) 101 | proxyEventBus.attach(chain: eventBus2, for SomeEvent.self) 102 | 103 | let subscriber1 = … 104 | let subscriber2 = … 105 | eventBus1.add(subscriber: subscriber1, for: SomeEvent.self) 106 | eventBus2.add(subscriber: subscriber2, for: SomeEvent.self) 107 | 108 | proxyEventBus.notify(SomeEvent.self) { subscriber in 109 | // … 110 | } 111 | 112 | // subscriber1 & subscriber2 are getting notified 113 | ``` 114 | 115 | For each event notified on either `eventBus1 ` or `eventBus2` a carbon copy will be forwarded to `proxyEventBus `. 116 | 117 | ### Encapsulation 118 | 119 | The API of EventBus is split up into these protocols: 120 | 121 | - `EventRegistrable` 122 | - `EventSubscribable` 123 | - `EventChainable` 124 | - `EventNotifiable` 125 | 126 | This enables for ergonomic safe encapsulation … 127 | 128 | ```swift 129 | public class Publisher { 130 | public var eventSubscribable: EventSubscribable { 131 | return self.eventBus 132 | } 133 | 134 | private let eventBus: EventBus = … 135 | 136 | // … 137 | } 138 | ``` 139 | 140 | … preventing anybody else from issuing notifications on `Publisher`'s event bus. 141 | 142 | ## Debugging 143 | 144 | As there is no way to see from the type of `EventBus` which kind of events are to be expected to be received from it, or allowed to notified on it, **EventBus** provides optional measures for catching misuse early and as an aid in general debugging. 145 | 146 | ### Debug subscription of unregistered event types: 147 | 148 | ```swift 149 | let eventBus = EventBus(options: [.warnUnknown]) 150 | eventBus.register(forEvent: FooEvent.self) 151 | 152 | // Needed to silence warning: 153 | // eventBus.register(forEvent: BarEvent.self) 154 | 155 | let subscriber = … 156 | eventBus.add(subscriber: subscriber, for: BarEvent.self) 157 | 158 | // Console: 159 | // Expected event of registered type (e.g. FooEvent), found: BarEvent. 160 | // Info: Use a "Swift Error Breakpoint" on type "EventBus.UnknownEventError" to catch. 161 | ``` 162 | 163 | ### Debug notification of unregistered event types: 164 | 165 | ```swift 166 | let eventBus = EventBus(options: [.warnUnknown]) 167 | eventBus.register(forEvent: FooEvent.self) 168 | 169 | // Needed to silence warning: 170 | // eventBus.register(forEvent: BarEvent.self) 171 | 172 | eventBus.notify(FooEvent.self) { subscriber in 173 | // … 174 | } 175 | 176 | // Console: 177 | // Expected event of registered type (e.g. FooEvent), found: BarEvent. 178 | // Info: Use a "Swift Error Breakpoint" on type "EventBus.UnknownEventError" to catch. 179 | ``` 180 | 181 | ### Debug unhandled events: 182 | 183 | ```swift 184 | let eventBus = EventBus(options: [.warnUnhandled]) 185 | 186 | // Needed to silence warning: 187 | // eventBus.add(subscriber: …, for: FooEvent.self) 188 | 189 | eventBus.notify(FooEvent.self) { subscriber in 190 | // … 191 | } 192 | 193 | // Console: 194 | // Expected event of registered type (e.g. FooEvent), found: BarEvent. 195 | // Info: Use a "Swift Error Breakpoint" on type "EventBus.UnhandledEventError" to catch. 196 | ``` 197 | 198 | ## Installation 199 | 200 | The recommended way to add **EventBus** to your project is via [Carthage](https://github.com/Carthage/Carthage): 201 | 202 | github 'regexident/EventBus' 203 | 204 | Or to add **EventBus** to your project is via [CocoaPods](https://cocoapods.org): 205 | 206 | pod 'Swift-EventBus' 207 | 208 | ## License 209 | 210 | **EventBus** is available under a **MPL-2 license**. See the `LICENSE` file for more info. 211 | -------------------------------------------------------------------------------- /Swift-EventBus.podspec: -------------------------------------------------------------------------------- 1 | Pod::Spec.new do |s| 2 | s.name = 'Swift-EventBus' 3 | s.version = '0.4.2' 4 | s.summary = 'A safe-by-default pure Swift notification center.' 5 | 6 | s.description = <<-DESC 7 | A safe-by-default pure Swift alternative to Cocoa's `NSNotificationCenter`. 8 | DESC 9 | 10 | s.homepage = 'https://github.com/regexident/EventBus' 11 | s.license = { :type => 'BSD-3', :file => 'LICENSE' } 12 | s.author = { 'regexident' => 'regexident@gmail.com' } 13 | s.source = { :git => 'https://github.com/regexident/EventBus.git', :tag => s.version.to_s } 14 | 15 | s.ios.deployment_target = '9.0' 16 | s.osx.deployment_target = '10.11' 17 | s.watchos.deployment_target = '3.0' 18 | s.tvos.deployment_target = '10.0' 19 | 20 | s.source_files = 'EventBus/**/*.swift' 21 | end 22 | -------------------------------------------------------------------------------- /jumbotron.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/regexident/EventBus/7ae8f64e56878b4e834c94276202d20db3daff9a/jumbotron.png -------------------------------------------------------------------------------- /screencast.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/regexident/EventBus/7ae8f64e56878b4e834c94276202d20db3daff9a/screencast.gif --------------------------------------------------------------------------------