├── .gitignore ├── LICENSE ├── Readme.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ └── main │ ├── AndroidManifest.xml │ ├── java │ └── com │ │ └── epam │ │ └── coroutine │ │ └── MainActivity.kt │ └── res │ ├── drawable-v24 │ └── ic_launcher_foreground.xml │ ├── drawable │ └── ic_launcher_background.xml │ ├── layout │ └── activity_main.xml │ ├── mipmap-anydpi-v26 │ ├── ic_launcher.xml │ └── ic_launcher_round.xml │ ├── mipmap-hdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-mdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-xhdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-xxhdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-xxxhdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ └── values │ ├── colors.xml │ ├── strings.xml │ └── styles.xml ├── build.gradle ├── coroutinesoperators ├── .gitignore ├── build.gradle └── src │ ├── main │ └── java │ │ └── com │ │ └── epam │ │ └── coroutinesextensions │ │ └── coroutinesoperators │ │ ├── ChannelOperators.kt │ │ └── DeferredOperators.kt │ └── test │ └── java │ └── com │ └── epam │ └── coroutinesextensions │ └── coroutinesoperators │ ├── ChannelOperatorsTests.kt │ ├── DeferredOperatorsTests.kt │ └── TestUtils.kt ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea 5 | .DS_Store 6 | /build 7 | /captures 8 | .externalNativeBuild 9 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright 2019 EPAM Systems, Inc. 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /Readme.md: -------------------------------------------------------------------------------- 1 | # Coroutines Operators 2 | 3 | ## Preview 4 | Kotlin Coroutines is growing in Android programming as a new way to create asynchronous work. Comparing them with RxJava, we can see that RxJava has a lot functions that helps to modify data, but Coroutines still has not got those functions. Coroutines Operators is library that created to fix those problems and provide users posibility to use same functions as in RxJava, but in Kotlin Coroutines. 5 | 6 | Library contains extensions for `Deferred` and `ReceiveChannel` classes. 7 | 8 | #### Note 9 | 10 | Coroutines Cache works only on `kotlin-coroutines:0.26.0` and above. 11 | 12 | ## List of extended functions 13 | 14 | ### Deferred 15 | 16 | * zip() - combine items from two Deferreds together via a specified function and return items based on the results of this function 17 | * zipWith() - instance version of zip() 18 | * map() - transform the items from Deferred by applying some function 19 | * flatMap() - transform the Collection items in Deferred into Deferreds, then flatten this into a single Collection 20 | * concatMap() - transform the Collection items in Deferred into Deferreds, then flatten this into a single Collection, without interleaving 21 | 22 | ### ReceiverChannels 23 | 24 | * distinctUntilChanged() - suppress duplicate consecutive items emitted by the ReceiverChannel 25 | * reduce() - apply a function to each emitted item, sequentially, and emit only the final accumulated value 26 | * concat() - concatenate two ReceiverChannels sequentially 27 | * concatWith() - instance version of concat() 28 | * debounce() - only emit an item from the source ReceiverChannel after a particular timespan has passed without the ReceiverChannel emitting any other items 29 | 30 | 31 | ## Examples 32 | 33 | ### zip 34 | 35 | Combine items from two Deferreds together via a specified function and return items based on the results of this function 36 | 37 | ```kotlin 38 | val firstName = async { "James" } 39 | val secondName = async { "Kirk" } 40 | println(zip(first, second, BiFunction { first: String, second: String -> "$first $second" })) 41 | // prints "James Kirk" 42 | ``` 43 | 44 | ### zipWith 45 | 46 | Instance version of [zip()](#zip) 47 | 48 | ```kotlin 49 | val firstName = async { "James" } 50 | val secondName = async { "Kirk" } 51 | println(first.zipWith(second, BiFunction { first: String, second: String -> "$first $second" })) 52 | // prints "James Kirk" 53 | ``` 54 | 55 | ### map 56 | 57 | Transform the items from Deferred by applying some function 58 | 59 | ```kotlin 60 | val hello = async { "Hello" } 61 | println(hello.map { item: String -> "$item world"}) 62 | // prints "Hello world" 63 | ``` 64 | 65 | ### flatMap 66 | 67 | Transform the Collection items in Deferred into Deferreds, then flatten this into a single Collection 68 | 69 | ```kotlin 70 | val time = System.currentTimeMillis() 71 | val dataArray = async { listOf(1, 2, 3, 4, 5) } 72 | val result = dataArray.flatMap ({ 73 | Thread.sleep(5000 - it * 1000L) 74 | it * 2 75 | }).toList() 76 | println(result) 77 | println("Working time is ${System.currentTimeMillis() - time}") 78 | // prints [10, 8, 6, 4, 2] Working time is 4097 79 | ``` 80 | ### concatMap 81 | 82 | Transform the Collection items in Deferred into Deferreds, then flatten this into a single Collection, without interleaving 83 | 84 | ```kotlin 85 | val time = System.currentTimeMillis() 86 | val dataArray = async { listOf(1, 2, 3, 4, 5) } 87 | val result = dataArray.concatMap ({ 88 | Thread.sleep(5000 - it * 1000L) 89 | it * 2 90 | }).toList() 91 | println(result) 92 | println("Working time is ${System.currentTimeMillis() - time}") 93 | // prints [2, 4, 6, 8, 10] Working time is 4303 94 | ``` 95 | 96 | ### distinctUntilChanged 97 | 98 | Suppress duplicate consecutive items emitted by the ReceiverChannel 99 | 100 | ```kotlin 101 | val list = listOf(1, 1, 1, 2, 2, 2, 3, 4, 4, 4) 102 | print(list.asReceiveChannel().distinctUntilChanged().toList()) 103 | // prints [1, 2, 3, 4] 104 | ``` 105 | 106 | Version with comparator 107 | ```kotlin 108 | val list = listOf(1, 1, 2, 6, 8, 3, 4, 6, 8) 109 | print(list.asReceiveChannel().distinctUntilChanged(comparator = { first, second -> first % 2 == second % 3 }).toList()) 110 | // prints [1, 2, 6, 3] 111 | ``` 112 | 113 | ### reduce 114 | 115 | Apply a function to each emitted item, sequentially, and emit only the final accumulated value 116 | 117 | ```kotlin 118 | val list = listOf(1, 2, 3, 4) 119 | print(list.asReceiveChannel().reduce(accumulator = { first, second -> first + second }).toList()) 120 | // prints [10] 121 | ``` 122 | 123 | Version with initial value 124 | 125 | ```kotlin 126 | val list = listOf(1, 2, 3, 4) 127 | print(list.asReceiveChannel().reduce(initialValue = 5, accumulator = { first, second -> first + second }).toList()) 128 | // prints [15] 129 | ``` 130 | 131 | ### concat 132 | 133 | Concatenate two ReceiverChannels sequentially 134 | 135 | ```kotlin 136 | val list1 = listOf(1, 2, 3, 4) 137 | val list2 = listOf(5, 6, 7) 138 | print(concat(first = list1.asReceiveChannel(), second = list2.asReceiveChannel()).toList()) 139 | // prints [1, 2, 3, 4, 5, 6, 7] 140 | ``` 141 | 142 | ### concatWith 143 | 144 | Instance version of [concat()](#concat) 145 | ```kotlin 146 | val list1 = listOf(1, 2, 3, 4) 147 | val list2 = listOf(5, 6, 7) 148 | print(list1.asReceiveChannel().concatWith(other = list2.asReceiveChannel()).toList()) 149 | // prints [1, 2, 3, 4, 5, 6, 7] 150 | ``` 151 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | apply plugin: 'kotlin-android' 4 | 5 | apply plugin: 'kotlin-android-extensions' 6 | 7 | android { 8 | compileSdkVersion 27 9 | defaultConfig { 10 | applicationId "com.epam.coroutine" 11 | minSdkVersion 25 12 | targetSdkVersion 27 13 | versionCode 1 14 | versionName project.versionName 15 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 16 | } 17 | buildTypes { 18 | release { 19 | minifyEnabled false 20 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 21 | } 22 | } 23 | } 24 | 25 | dependencies { 26 | implementation fileTree(dir: 'libs', include: ['*.jar']) 27 | implementation"org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" 28 | implementation 'com.android.support:appcompat-v7:27.1.1' 29 | implementation 'com.android.support.constraint:constraint-layout:1.1.2' 30 | testImplementation 'junit:junit:4.12' 31 | androidTestImplementation 'com.android.support.test:runner:1.0.2' 32 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' 33 | } 34 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile 22 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | -------------------------------------------------------------------------------- /app/src/main/java/com/epam/coroutine/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.epam.coroutine 2 | 3 | import android.support.v7.app.AppCompatActivity 4 | import android.os.Bundle 5 | 6 | class MainActivity : AppCompatActivity() { 7 | 8 | override fun onCreate(savedInstanceState: Bundle?) { 9 | super.onCreate(savedInstanceState) 10 | setContentView(R.layout.activity_main) 11 | } 12 | } 13 | -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 12 | 13 | 19 | 22 | 25 | 26 | 27 | 28 | 34 | 35 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 11 | 16 | 21 | 26 | 31 | 36 | 41 | 46 | 51 | 56 | 61 | 66 | 71 | 76 | 81 | 86 | 91 | 96 | 101 | 106 | 111 | 116 | 121 | 126 | 131 | 136 | 141 | 146 | 151 | 156 | 161 | 166 | 171 | 172 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 9 | 10 | 18 | 19 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/epam/CoroutinesExtensions/3addb9aed9a55259d337509dc3ceffef18ed305d/app/src/main/res/mipmap-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/epam/CoroutinesExtensions/3addb9aed9a55259d337509dc3ceffef18ed305d/app/src/main/res/mipmap-hdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-mdpi/ic_launcher.png: -------------------------------------------------------------------------------- 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/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/epam/CoroutinesExtensions/3addb9aed9a55259d337509dc3ceffef18ed305d/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/epam/CoroutinesExtensions/3addb9aed9a55259d337509dc3ceffef18ed305d/app/src/main/res/mipmap-xxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- 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/app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #3F51B5 4 | #303F9F 5 | #FF4081 6 | 7 | -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | Coroutine 3 | 4 | -------------------------------------------------------------------------------- /app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | // Top-level build file where you can add configuration options common to all sub-projects/modules. 2 | 3 | project.ext.set("versionName", "0.9.0") 4 | 5 | buildscript { 6 | ext.kotlin_version = '1.3.10' 7 | repositories { 8 | google() 9 | jcenter() 10 | } 11 | dependencies { 12 | classpath 'com.android.tools.build:gradle:3.2.1' 13 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" 14 | 15 | // NOTE: Do not place your application dependencies here; they belong 16 | // in the individual module build.gradle files 17 | } 18 | } 19 | 20 | allprojects { 21 | repositories { 22 | google() 23 | jcenter() 24 | } 25 | } 26 | 27 | task clean(type: Delete) { 28 | delete rootProject.buildDir 29 | } 30 | -------------------------------------------------------------------------------- /coroutinesoperators/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /coroutinesoperators/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'java-library' 2 | apply plugin: 'kotlin' 3 | 4 | version = project.versionName 5 | 6 | dependencies { 7 | implementation fileTree(dir: 'libs', include: ['*.jar']) 8 | implementation"org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" 9 | implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.0" 10 | testImplementation 'junit:junit:4.12' 11 | } 12 | 13 | repositories { 14 | mavenCentral() 15 | } 16 | compileKotlin { 17 | kotlinOptions { 18 | jvmTarget = "1.8" 19 | } 20 | } 21 | compileTestKotlin { 22 | kotlinOptions { 23 | jvmTarget = "1.8" 24 | } 25 | } 26 | -------------------------------------------------------------------------------- /coroutinesoperators/src/main/java/com/epam/coroutinesextensions/coroutinesoperators/ChannelOperators.kt: -------------------------------------------------------------------------------- 1 | package com.epam.coroutinesextensions.coroutinesoperators 2 | 3 | import kotlinx.coroutines.CoroutineScope 4 | import kotlinx.coroutines.Dispatchers 5 | import kotlinx.coroutines.GlobalScope 6 | import kotlinx.coroutines.channels.ReceiveChannel 7 | import kotlinx.coroutines.channels.consumeEach 8 | import kotlinx.coroutines.channels.produce 9 | import kotlinx.coroutines.delay 10 | import kotlin.coroutines.CoroutineContext 11 | 12 | 13 | suspend fun ReceiveChannel.distinctUntilChanged( 14 | context: CoroutineContext = Dispatchers.Unconfined, 15 | scope: CoroutineScope = GlobalScope): ReceiveChannel = 16 | scope.produce(context) { 17 | var prev: T? = null 18 | 19 | consumeEach { 20 | if (it != prev) { 21 | send(it) 22 | prev = it 23 | } 24 | } 25 | } 26 | 27 | suspend fun ReceiveChannel.distinctUntilChanged(context: CoroutineContext = Dispatchers.Unconfined, 28 | scope: CoroutineScope = GlobalScope, 29 | comparator: (T, T) -> Boolean): ReceiveChannel = 30 | scope.produce(context) { 31 | var prev: T = receive() 32 | send(prev) 33 | 34 | consumeEach { it -> 35 | if (!comparator(it, prev)) { 36 | send(it) 37 | prev = it 38 | } 39 | } 40 | } 41 | 42 | suspend fun ReceiveChannel.reduce( 43 | context: CoroutineContext = Dispatchers.Unconfined, 44 | accumulator: (T, T) -> T, 45 | scope: CoroutineScope = GlobalScope 46 | ): ReceiveChannel = scope.produce(context) { 47 | var result: T = receive() 48 | 49 | consumeEach { result = accumulator(it, result) } 50 | send(result) 51 | } 52 | 53 | suspend fun ReceiveChannel.reduce( 54 | initialValue: T, 55 | context: CoroutineContext = Dispatchers.Unconfined, 56 | accumulator: (T, T) -> T, 57 | scope: CoroutineScope = GlobalScope 58 | ): ReceiveChannel = scope.produce(context) { 59 | var result = initialValue 60 | 61 | consumeEach { result = accumulator(it, result) } 62 | send(result) 63 | } 64 | 65 | suspend fun ReceiveChannel.concatWith( 66 | context: CoroutineContext = Dispatchers.Unconfined, 67 | other: ReceiveChannel, 68 | scope: CoroutineScope = GlobalScope 69 | ): ReceiveChannel = scope.produce(context) { 70 | consumeEach { it -> 71 | send(it) 72 | } 73 | other.consumeEach { 74 | send(it) 75 | } 76 | } 77 | 78 | suspend fun concat( 79 | context: CoroutineContext = Dispatchers.Unconfined, 80 | first: ReceiveChannel, 81 | second: ReceiveChannel 82 | ): ReceiveChannel = first.concatWith(context, second) 83 | 84 | fun ReceiveChannel.debounce( 85 | wait: Long = 300, 86 | context: CoroutineContext = Dispatchers.Unconfined, 87 | scope: CoroutineScope = GlobalScope 88 | ): ReceiveChannel = scope.produce(context) { 89 | var nextTime = 0L 90 | consumeEach { 91 | val curTime: Long = java.lang.System.currentTimeMillis() 92 | if (curTime < nextTime) { 93 | // not enough time passed from last send 94 | delay(nextTime - curTime) 95 | var mostRecent = it 96 | while (!isEmpty) { 97 | mostRecent = receive() 98 | } // take the most recently sent without waiting 99 | nextTime += wait // maintain strict time interval between sends 100 | send(mostRecent) 101 | } else { 102 | // big pause between original events 103 | nextTime = curTime + wait // start tracking time interval from scratch 104 | send(it) 105 | } 106 | } 107 | } 108 | 109 | fun Iterable.asReceiveChannel(context: CoroutineContext = Dispatchers.Unconfined): ReceiveChannel = 110 | GlobalScope.produce(context) { 111 | for (element in this@asReceiveChannel) 112 | send(element) 113 | } 114 | 115 | -------------------------------------------------------------------------------- /coroutinesoperators/src/main/java/com/epam/coroutinesextensions/coroutinesoperators/DeferredOperators.kt: -------------------------------------------------------------------------------- 1 | package com.epam.coroutinesextensions.coroutinesoperators 2 | 3 | import kotlinx.coroutines.* 4 | 5 | /** 6 | * @function - zip: Combine items from two Deferreds together via a specified function and return items based on the results of this function 7 | * @param source1 - first deferred, whose result will be used in zipper 8 | * @param source2 - second deferred, whose result will be used in zipper 9 | * @param zipper - function, that will be called with deferred's results 10 | */ 11 | suspend fun zip(source1: Deferred, source2: Deferred, coroutineStart: CoroutineStart = CoroutineStart.DEFAULT, zipper: (T1, T2) -> R): Deferred = 12 | coroutineScope { 13 | async(start = coroutineStart) { 14 | zipper(source1.await(), source2.await()) 15 | } 16 | } 17 | 18 | /** 19 | * @function - zipWith: Instance version of zip() function 20 | * @param other - second Deferred that will be zipped to first deferred instance 21 | * @param zipper - function, that will applied to result of two deferreds 22 | */ 23 | suspend fun Deferred.zipWith(other: Deferred, coroutineStart: CoroutineStart = CoroutineStart.DEFAULT, zipper: (T1, T2) -> R): Deferred { 24 | return zip(this, other, coroutineStart, zipper) 25 | } 26 | 27 | /** 28 | * @function - map: Transform the items from Deferred by applying some function 29 | * @param mapper - function that will be used for deferred result 30 | */ 31 | suspend fun Deferred.map(mapper: (T) -> R): Deferred = 32 | coroutineScope { 33 | async { 34 | mapper(this@map.await()) 35 | } 36 | } 37 | 38 | /** 39 | * @function - flatMap: Transform the Collection items in Deferred into Deferreds, then flatten this into a single Collection 40 | * @param mapper - function that will be applied for each element if deferred's result 41 | */ 42 | suspend fun , R> Deferred.flatMap(coroutineStart: CoroutineStart = CoroutineStart.DEFAULT, mapper: (K) -> R): Deferred> = 43 | coroutineScope { 44 | async(start = coroutineStart) { 45 | val result = mutableListOf() 46 | val list = mutableListOf>() 47 | await().forEach { list.add(async { result.add(mapper(it)) }) } 48 | list.forEach { it.await() } 49 | return@async result 50 | } 51 | } 52 | 53 | /** 54 | * @function - concatMap: Transform the Collection items in Deferred into Deferreds, then flatten this into a single Collection, without interleaving 55 | * @param mapper - function that will be applied for each element if deferred's result 56 | */ 57 | suspend fun , R> Deferred.concatMap(coroutineStart: CoroutineStart = CoroutineStart.DEFAULT, mapper: (K) -> R): Deferred> = 58 | coroutineScope { 59 | async(start = coroutineStart) { 60 | await().map { async { mapper(it) } }.map { it.await() } 61 | } 62 | } -------------------------------------------------------------------------------- /coroutinesoperators/src/test/java/com/epam/coroutinesextensions/coroutinesoperators/ChannelOperatorsTests.kt: -------------------------------------------------------------------------------- 1 | package com.epam.coroutinesextensions.coroutinesoperators 2 | 3 | import junit.framework.Assert 4 | import kotlinx.coroutines.channels.toList 5 | import kotlinx.coroutines.runBlocking 6 | import org.junit.Test 7 | 8 | class ChannelOperatorsTests { 9 | 10 | @Test 11 | fun distinctUntilChangedTest() = runBlocking { 12 | val list = listOf(1, 1, 1, 2, 2, 2, 3, 4, 4, 4) 13 | val result = listOf(1, 2, 3, 4) 14 | Assert.assertEquals(result, list.asReceiveChannel().distinctUntilChanged().toList()) 15 | } 16 | 17 | @Test 18 | fun distinctUntilChangedWithComparatorTest() = runBlocking { 19 | val list = listOf(1, 1, 2, 6, 8, 3, 4, 6, 8) 20 | val result = listOf(1, 2, 3, 4) 21 | Assert.assertEquals(result, list.asReceiveChannel().distinctUntilChanged(comparator = { first, second -> first % 2 == second % 2 }).toList()) 22 | } 23 | 24 | @Test 25 | fun reduceTest() = runBlocking { 26 | val list = listOf(1, 2, 3, 4) 27 | val result = listOf(10) 28 | Assert.assertEquals(result, list.asReceiveChannel().reduce(accumulator = { first, second -> first + second }).toList()) 29 | } 30 | 31 | @Test 32 | fun reduceWithInitialValueTest() = runBlocking { 33 | val list = listOf(1, 2, 3, 4) 34 | val result = listOf(15) 35 | Assert.assertEquals(result, list.asReceiveChannel().reduce(initialValue = 5, accumulator = { first, second -> first + second }).toList()) 36 | } 37 | 38 | @Test 39 | fun concatWithTest() = runBlocking { 40 | val list1 = listOf(1, 2, 3, 4) 41 | val list2 = listOf(5, 6, 7, 8) 42 | val result = listOf(1, 2, 3, 4, 5, 6, 7, 8) 43 | Assert.assertEquals(result, list1.asReceiveChannel().concatWith(other = list2.asReceiveChannel()).toList()) 44 | } 45 | 46 | @Test 47 | fun concatTest() = runBlocking { 48 | val list1 = listOf(1, 2, 3, 4) 49 | val list2 = listOf(5, 6, 7, 8) 50 | val result = listOf(1, 2, 3, 4, 5, 6, 7, 8) 51 | Assert.assertEquals(result, concat(first = list1.asReceiveChannel(), second = list2.asReceiveChannel()).toList()) 52 | } 53 | } -------------------------------------------------------------------------------- /coroutinesoperators/src/test/java/com/epam/coroutinesextensions/coroutinesoperators/DeferredOperatorsTests.kt: -------------------------------------------------------------------------------- 1 | package com.epam.coroutinesextensions.coroutinesoperators 2 | 3 | import junit.framework.Assert.assertEquals 4 | import junit.framework.Assert.assertTrue 5 | import kotlinx.coroutines.* 6 | import org.junit.Test 7 | import kotlin.coroutines.CoroutineContext 8 | 9 | class DeferredOperatorsTests { 10 | 11 | @Test 12 | fun zipTest() = runBlocking { 13 | val first = 1.toDeferred() 14 | val second = 2.toDeferred() 15 | val result = 3 16 | 17 | assertEquals(result, zip(first, second) { firstValue: Int, secondValue: Int -> firstValue + secondValue }.await()) 18 | } 19 | 20 | @Test 21 | fun zipWithTest() = runBlocking { 22 | val first = 1.toDeferred() 23 | val second = 2.toDeferred() 24 | val result = 3 25 | 26 | assertEquals(result, first.zipWith(second) { firstValue: Int, secondValue: Int -> firstValue + secondValue }.await()) 27 | } 28 | 29 | 30 | @Test 31 | fun mapTest() = runBlocking { 32 | val mapper = { a: Int -> a * 3 } 33 | val from = 1.toDeferred() 34 | val result = 3 35 | 36 | assertEquals(result, from.map(mapper).await()) 37 | } 38 | 39 | @Test 40 | fun flatMapTest() = runBlocking { 41 | val dataArray = async { listOf(1, 2, 3, 4, 5) } 42 | val resultDataArray = listOf(10, 8, 6, 4, 2) 43 | var result: Collection? = null 44 | GlobalScope.async { 45 | val time = System.currentTimeMillis() 46 | result = dataArray.flatMap { 47 | Thread.sleep(5000 - it * 1000L) 48 | it * 2 49 | }.await() 50 | println("Working time is ${System.currentTimeMillis() - time}") 51 | }.await() 52 | 53 | assertTrue(resultDataArray.deepEquals(result!!)) 54 | } 55 | 56 | @Test 57 | fun concatMapTest() = runBlocking { 58 | val dataArray = async { listOf(1, 2, 3, 4, 5) } 59 | val resultDataArray = listOf(2, 4, 6, 8, 10) 60 | var result: Collection? = null 61 | GlobalScope.async { 62 | val time = System.currentTimeMillis() 63 | result = dataArray.concatMap { 64 | Thread.sleep(5000 - it * 1000L) 65 | it * 2 66 | }.await() 67 | println("Working time is ${System.currentTimeMillis() - time}") 68 | }.await() 69 | 70 | assertTrue(resultDataArray.deepEquals(result!!)) 71 | } 72 | 73 | private suspend fun T.toDeferred(): Deferred { 74 | return background { this } 75 | } 76 | 77 | private suspend fun background(context: CoroutineContext = Dispatchers.Default, block: suspend () -> X): Deferred { 78 | return coroutineScope { 79 | async(context) { 80 | block.invoke() 81 | } 82 | } 83 | } 84 | } -------------------------------------------------------------------------------- /coroutinesoperators/src/test/java/com/epam/coroutinesextensions/coroutinesoperators/TestUtils.kt: -------------------------------------------------------------------------------- 1 | package com.epam.coroutinesextensions.coroutinesoperators 2 | 3 | fun Collection.deepEquals(other: Collection) = 4 | this.containsAll(other) && other.containsAll(this) 5 | -------------------------------------------------------------------------------- /gradle.properties: -------------------------------------------------------------------------------- 1 | # Project-wide Gradle settings. 2 | # IDE (e.g. Android Studio) users: 3 | # Gradle settings configured through the IDE *will override* 4 | # any settings specified in this file. 5 | # For more details on how to configure your build environment visit 6 | # http://www.gradle.org/docs/current/userguide/build_environment.html 7 | # Specifies the JVM arguments used for the daemon process. 8 | # The setting is particularly useful for tweaking memory settings. 9 | org.gradle.jvmargs=-Xmx1536m 10 | # When configured, Gradle will run in incubating parallel mode. 11 | # This option should only be used with decoupled projects. More details, visit 12 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects 13 | # org.gradle.parallel=true 14 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/epam/CoroutinesExtensions/3addb9aed9a55259d337509dc3ceffef18ed305d/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Mon Oct 29 13:38:49 MSK 2018 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip 7 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Attempt to set APP_HOME 10 | # Resolve links: $0 may be a link 11 | PRG="$0" 12 | # Need this for relative symlinks. 13 | while [ -h "$PRG" ] ; do 14 | ls=`ls -ld "$PRG"` 15 | link=`expr "$ls" : '.*-> \(.*\)$'` 16 | if expr "$link" : '/.*' > /dev/null; then 17 | PRG="$link" 18 | else 19 | PRG=`dirname "$PRG"`"/$link" 20 | fi 21 | done 22 | SAVED="`pwd`" 23 | cd "`dirname \"$PRG\"`/" >/dev/null 24 | APP_HOME="`pwd -P`" 25 | cd "$SAVED" >/dev/null 26 | 27 | APP_NAME="Gradle" 28 | APP_BASE_NAME=`basename "$0"` 29 | 30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 31 | DEFAULT_JVM_OPTS="" 32 | 33 | # Use the maximum available, or set MAX_FD != -1 to use that value. 34 | MAX_FD="maximum" 35 | 36 | warn () { 37 | echo "$*" 38 | } 39 | 40 | die () { 41 | echo 42 | echo "$*" 43 | echo 44 | exit 1 45 | } 46 | 47 | # OS specific support (must be 'true' or 'false'). 48 | cygwin=false 49 | msys=false 50 | darwin=false 51 | nonstop=false 52 | case "`uname`" in 53 | CYGWIN* ) 54 | cygwin=true 55 | ;; 56 | Darwin* ) 57 | darwin=true 58 | ;; 59 | MINGW* ) 60 | msys=true 61 | ;; 62 | NONSTOP* ) 63 | nonstop=true 64 | ;; 65 | esac 66 | 67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 68 | 69 | # Determine the Java command to use to start the JVM. 70 | if [ -n "$JAVA_HOME" ] ; then 71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 72 | # IBM's JDK on AIX uses strange locations for the executables 73 | JAVACMD="$JAVA_HOME/jre/sh/java" 74 | else 75 | JAVACMD="$JAVA_HOME/bin/java" 76 | fi 77 | if [ ! -x "$JAVACMD" ] ; then 78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 79 | 80 | Please set the JAVA_HOME variable in your environment to match the 81 | location of your Java installation." 82 | fi 83 | else 84 | JAVACMD="java" 85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 86 | 87 | Please set the JAVA_HOME variable in your environment to match the 88 | location of your Java installation." 89 | fi 90 | 91 | # Increase the maximum file descriptors if we can. 92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 93 | MAX_FD_LIMIT=`ulimit -H -n` 94 | if [ $? -eq 0 ] ; then 95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 96 | MAX_FD="$MAX_FD_LIMIT" 97 | fi 98 | ulimit -n $MAX_FD 99 | if [ $? -ne 0 ] ; then 100 | warn "Could not set maximum file descriptor limit: $MAX_FD" 101 | fi 102 | else 103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 104 | fi 105 | fi 106 | 107 | # For Darwin, add options to specify how the application appears in the dock 108 | if $darwin; then 109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 110 | fi 111 | 112 | # For Cygwin, switch paths to Windows format before running java 113 | if $cygwin ; then 114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 116 | JAVACMD=`cygpath --unix "$JAVACMD"` 117 | 118 | # We build the pattern for arguments to be converted via cygpath 119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 120 | SEP="" 121 | for dir in $ROOTDIRSRAW ; do 122 | ROOTDIRS="$ROOTDIRS$SEP$dir" 123 | SEP="|" 124 | done 125 | OURCYGPATTERN="(^($ROOTDIRS))" 126 | # Add a user-defined pattern to the cygpath arguments 127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 129 | fi 130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 131 | i=0 132 | for arg in "$@" ; do 133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 135 | 136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 138 | else 139 | eval `echo args$i`="\"$arg\"" 140 | fi 141 | i=$((i+1)) 142 | done 143 | case $i in 144 | (0) set -- ;; 145 | (1) set -- "$args0" ;; 146 | (2) set -- "$args0" "$args1" ;; 147 | (3) set -- "$args0" "$args1" "$args2" ;; 148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 154 | esac 155 | fi 156 | 157 | # Escape application args 158 | save () { 159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 160 | echo " " 161 | } 162 | APP_ARGS=$(save "$@") 163 | 164 | # Collect all arguments for the java command, following the shell quoting and substitution rules 165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 166 | 167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong 168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then 169 | cd "$(dirname "$0")" 170 | fi 171 | 172 | exec "$JAVACMD" "$@" 173 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | set DIRNAME=%~dp0 12 | if "%DIRNAME%" == "" set DIRNAME=. 13 | set APP_BASE_NAME=%~n0 14 | set APP_HOME=%DIRNAME% 15 | 16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 17 | set DEFAULT_JVM_OPTS= 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windows variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | 53 | :win9xME_args 54 | @rem Slurp the command line arguments. 55 | set CMD_LINE_ARGS= 56 | set _SKIP=2 57 | 58 | :win9xME_args_slurp 59 | if "x%~1" == "x" goto execute 60 | 61 | set CMD_LINE_ARGS=%* 62 | 63 | :execute 64 | @rem Setup the command line 65 | 66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 67 | 68 | @rem Execute Gradle 69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 70 | 71 | :end 72 | @rem End local scope for the variables with windows NT shell 73 | if "%ERRORLEVEL%"=="0" goto mainEnd 74 | 75 | :fail 76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 77 | rem the _cmd.exe /c_ return code! 78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 79 | exit /b 1 80 | 81 | :mainEnd 82 | if "%OS%"=="Windows_NT" endlocal 83 | 84 | :omega 85 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app', ':coroutinesoperators' 2 | --------------------------------------------------------------------------------