├── .gitignore ├── LICENSE ├── README.md ├── build.sbt ├── project ├── build.properties └── plugins.sbt └── src ├── main ├── boilerplate │ └── com │ │ └── reactivedesignpatterns │ │ └── Scoped.scala.template └── scala │ ├── akka │ └── rdpextras │ │ └── AskPattern.scala │ ├── com │ └── reactivedesignpatterns │ │ ├── Defaults.scala │ │ └── chapter4 │ │ ├── EchoService.scala │ │ └── TranslationService.scala │ └── scala │ └── concurrent │ └── rdpextras │ └── SynchronousEventLoop.scala └── test └── scala └── com └── reactivedesignpatterns └── chapter4 ├── EchoServiceSpec.scala └── TranslationServiceSpec.scala /.gitignore: -------------------------------------------------------------------------------- 1 | # Created by http://www.gitignore.io 2 | 3 | ### vim ### 4 | [._]*.s[a-w][a-z] 5 | [._]s[a-w][a-z] 6 | *.un~ 7 | Session.vim 8 | .netrwhist 9 | *~ 10 | 11 | 12 | ### Eclipse ### 13 | *.pydevproject 14 | .metadata 15 | .gradle 16 | bin/ 17 | tmp/ 18 | *.tmp 19 | *.bak 20 | *.swp 21 | *~.nib 22 | local.properties 23 | .settings/ 24 | .loadpath 25 | .project 26 | .classpath 27 | 28 | # External tool builders 29 | .externalToolBuilders/ 30 | 31 | # Locally stored "Eclipse launch configurations" 32 | *.launch 33 | 34 | # CDT-specific 35 | .cproject 36 | 37 | # PDT-specific 38 | .buildpath 39 | 40 | # sbteclipse plugin 41 | .target 42 | 43 | # TeXlipse plugin 44 | .texlipse 45 | 46 | 47 | ### Scala ### 48 | *.class 49 | *.log 50 | 51 | # sbt specific 52 | .cache/ 53 | .history/ 54 | .lib/ 55 | dist/* 56 | target/ 57 | lib_managed/ 58 | src_managed/ 59 | project/boot/ 60 | project/plugins/project/ 61 | 62 | # Scala-IDE specific 63 | .scala_dependencies 64 | .worksheet 65 | 66 | 67 | ### Intellij ### 68 | # Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm 69 | 70 | ## Directory-based project format 71 | .idea/ 72 | /*.iml 73 | # if you remove the above rule, at least ignore user-specific stuff: 74 | # .idea/workspace.xml 75 | # .idea/tasks.xml 76 | # .idea/dictionaries 77 | # and these sensitive or high-churn files: 78 | # .idea/dataSources.ids 79 | # .idea/dataSources.xml 80 | # .idea/sqlDataSources.xml 81 | # .idea/dynamic.xml 82 | # and, if using gradle:: 83 | # .idea/gradle.xml 84 | # .idea/libraries 85 | 86 | ## File-based project format 87 | *.ipr 88 | *.iws 89 | 90 | ## Additional for IntelliJ 91 | out/ 92 | 93 | # generated by mpeltonen/sbt-idea plugin 94 | .idea_modules/ 95 | 96 | # generated by JIRA plugin 97 | atlassian-ide-plugin.xml 98 | 99 | # generated by Crashlytics plugin (for Android Studio and Intellij) 100 | com_crashlytics_export_strings.xml 101 | 102 | 103 | ### SBT ### 104 | # Simple Build Tool 105 | # http://www.scala-sbt.org/release/docs/Getting-Started/Directories.html#configuring-version-control 106 | 107 | target/ 108 | lib_managed/ 109 | src_managed/ 110 | project/boot/ 111 | .history 112 | .cache 113 | -------------------------------------------------------------------------------- /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. Definitions. 8 | 9 | "License" shall mean the terms and conditions for use, reproduction, 10 | and distribution as defined by Sections 1 through 9 of this document. 11 | 12 | "Licensor" shall mean the copyright owner or entity authorized by 13 | the copyright owner that is granting the License. 14 | 15 | "Legal Entity" shall mean the union of the acting entity and all 16 | other entities that control, are controlled by, or are under common 17 | control with that entity. For the purposes of this definition, 18 | "control" means (i) the power, direct or indirect, to cause the 19 | direction or management of such entity, whether by contract or 20 | otherwise, or (ii) ownership of fifty percent (50%) or more of the 21 | outstanding shares, or (iii) beneficial ownership of such entity. 22 | 23 | "You" (or "Your") shall mean an individual or Legal Entity 24 | exercising permissions granted by this License. 25 | 26 | "Source" form shall mean the preferred form for making modifications, 27 | including but not limited to software source code, documentation 28 | source, and configuration files. 29 | 30 | "Object" form shall mean any form resulting from mechanical 31 | transformation or translation of a Source form, including but 32 | not limited to compiled object code, generated documentation, 33 | and conversions to other media types. 34 | 35 | "Work" shall mean the work of authorship, whether in Source or 36 | Object form, made available under the License, as indicated by a 37 | copyright notice that is included in or attached to the work 38 | (an example is provided in the Appendix below). 39 | 40 | "Derivative Works" shall mean any work, whether in Source or Object 41 | form, that is based on (or derived from) the Work and for which the 42 | editorial revisions, annotations, elaborations, or other modifications 43 | represent, as a whole, an original work of authorship. For the purposes 44 | of this License, Derivative Works shall not include works that remain 45 | separable from, or merely link (or bind by name) to the interfaces of, 46 | the Work and Derivative Works thereof. 47 | 48 | "Contribution" shall mean any work of authorship, including 49 | the original version of the Work and any modifications or additions 50 | to that Work or Derivative Works thereof, that is intentionally 51 | submitted to Licensor for inclusion in the Work by the copyright owner 52 | or by an individual or Legal Entity authorized to submit on behalf of 53 | the copyright owner. For the purposes of this definition, "submitted" 54 | means any form of electronic, verbal, or written communication sent 55 | to the Licensor or its representatives, including but not limited to 56 | communication on electronic mailing lists, source code control systems, 57 | and issue tracking systems that are managed by, or on behalf of, the 58 | Licensor for the purpose of discussing and improving the Work, but 59 | excluding communication that is conspicuously marked or otherwise 60 | designated in writing by the copyright owner as "Not a Contribution." 61 | 62 | "Contributor" shall mean Licensor and any individual or Legal Entity 63 | on behalf of whom a Contribution has been received by Licensor and 64 | subsequently incorporated within the Work. 65 | 66 | 2. Grant of Copyright License. Subject to the terms and conditions of 67 | this License, each Contributor hereby grants to You a perpetual, 68 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 69 | copyright license to reproduce, prepare Derivative Works of, 70 | publicly display, publicly perform, sublicense, and distribute the 71 | Work and such Derivative Works in Source or Object form. 72 | 73 | 3. Grant of Patent License. Subject to the terms and conditions of 74 | this License, each Contributor hereby grants to You a perpetual, 75 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 76 | (except as stated in this section) patent license to make, have made, 77 | use, offer to sell, sell, import, and otherwise transfer the Work, 78 | where such license applies only to those patent claims licensable 79 | by such Contributor that are necessarily infringed by their 80 | Contribution(s) alone or by combination of their Contribution(s) 81 | with the Work to which such Contribution(s) was submitted. If You 82 | institute patent litigation against any entity (including a 83 | cross-claim or counterclaim in a lawsuit) alleging that the Work 84 | or a Contribution incorporated within the Work constitutes direct 85 | or contributory patent infringement, then any patent licenses 86 | granted to You under this License for that Work shall terminate 87 | as of the date such litigation is filed. 88 | 89 | 4. Redistribution. You may reproduce and distribute copies of the 90 | Work or Derivative Works thereof in any medium, with or without 91 | modifications, and in Source or Object form, provided that You 92 | meet the following conditions: 93 | 94 | (a) You must give any other recipients of the Work or 95 | Derivative Works a copy of this License; and 96 | 97 | (b) You must cause any modified files to carry prominent notices 98 | stating that You changed the files; and 99 | 100 | (c) You must retain, in the Source form of any Derivative Works 101 | that You distribute, all copyright, patent, trademark, and 102 | attribution notices from the Source form of the Work, 103 | excluding those notices that do not pertain to any part of 104 | the Derivative Works; and 105 | 106 | (d) If the Work includes a "NOTICE" text file as part of its 107 | distribution, then any Derivative Works that You distribute must 108 | include a readable copy of the attribution notices contained 109 | within such NOTICE file, excluding those notices that do not 110 | pertain to any part of the Derivative Works, in at least one 111 | of the following places: within a NOTICE text file distributed 112 | as part of the Derivative Works; within the Source form or 113 | documentation, if provided along with the Derivative Works; or, 114 | within a display generated by the Derivative Works, if and 115 | wherever such third-party notices normally appear. The contents 116 | of the NOTICE file are for informational purposes only and 117 | do not modify the License. You may add Your own attribution 118 | notices within Derivative Works that You distribute, alongside 119 | or as an addendum to the NOTICE text from the Work, provided 120 | that such additional attribution notices cannot be construed 121 | as modifying the License. 122 | 123 | You may add Your own copyright statement to Your modifications and 124 | may provide additional or different license terms and conditions 125 | for use, reproduction, or distribution of Your modifications, or 126 | for any such Derivative Works as a whole, provided Your use, 127 | reproduction, and distribution of the Work otherwise complies with 128 | the conditions stated in this License. 129 | 130 | 5. Submission of Contributions. Unless You explicitly state otherwise, 131 | any Contribution intentionally submitted for inclusion in the Work 132 | by You to the Licensor shall be under the terms and conditions of 133 | this License, without any additional terms or conditions. 134 | Notwithstanding the above, nothing herein shall supersede or modify 135 | the terms of any separate license agreement you may have executed 136 | with Licensor regarding such Contributions. 137 | 138 | 6. Trademarks. This License does not grant permission to use the trade 139 | names, trademarks, service marks, or product names of the Licensor, 140 | except as required for reasonable and customary use in describing the 141 | origin of the Work and reproducing the content of the NOTICE file. 142 | 143 | 7. Disclaimer of Warranty. Unless required by applicable law or 144 | agreed to in writing, Licensor provides the Work (and each 145 | Contributor provides its Contributions) on an "AS IS" BASIS, 146 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 147 | implied, including, without limitation, any warranties or conditions 148 | of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A 149 | PARTICULAR PURPOSE. You are solely responsible for determining the 150 | appropriateness of using or redistributing the Work and assume any 151 | risks associated with Your exercise of permissions under this License. 152 | 153 | 8. Limitation of Liability. In no event and under no legal theory, 154 | whether in tort (including negligence), contract, or otherwise, 155 | unless required by applicable law (such as deliberate and grossly 156 | negligent acts) or agreed to in writing, shall any Contributor be 157 | liable to You for damages, including any direct, indirect, special, 158 | incidental, or consequential damages of any character arising as a 159 | result of this License or out of the use or inability to use the 160 | Work (including but not limited to damages for loss of goodwill, 161 | work stoppage, computer failure or malfunction, or any and all 162 | other commercial damages or losses), even if such Contributor 163 | has been advised of the possibility of such damages. 164 | 165 | 9. Accepting Warranty or Additional Liability. While redistributing 166 | the Work or Derivative Works thereof, You may choose to offer, 167 | and charge a fee for, acceptance of support, warranty, indemnity, 168 | or other liability obligations and/or rights consistent with this 169 | License. However, in accepting such obligations, You may act only 170 | on Your own behalf and on Your sole responsibility, not on behalf 171 | of any other Contributor, and only if You agree to indemnify, 172 | defend, and hold each Contributor harmless for any liability 173 | incurred by, or claims asserted against, such Contributor by reason 174 | of your accepting any such warranty or additional liability. 175 | 176 | END OF TERMS AND CONDITIONS 177 | 178 | APPENDIX: How to apply the Apache License to your work. 179 | 180 | To apply the Apache License to your work, attach the following 181 | boilerplate notice, with the fields enclosed by brackets "{}" 182 | replaced with your own identifying information. (Don't include 183 | the brackets!) The text should be enclosed in the appropriate 184 | comment syntax for the file format. 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 {yyyy} {name of copyright owner} 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 | Chapter-4 2 | ========= 3 | 4 | Code examples for chapter four: Patterns for Testing Reactive Systems 5 | -------------------------------------------------------------------------------- /build.sbt: -------------------------------------------------------------------------------- 1 | name := "chapter-4" 2 | 3 | organization := "com.reactivedesignpatterns" 4 | 5 | version := "0.1.0-SNAPSHOT" 6 | 7 | libraryDependencies ++= Seq( 8 | "com.typesafe.akka" %% "akka-actor" % "2.3.6", 9 | "org.scala-lang.modules" %% "scala-async" % "0.9.2", 10 | "com.typesafe.akka" %% "akka-testkit" % "2.3.6" % "test", 11 | "junit" % "junit" % "4.11" % "test", 12 | "org.scalatest" %% "scalatest" % "2.2.2" % "test" 13 | ) 14 | 15 | scalaVersion := "2.11.2" 16 | 17 | spray.boilerplate.BoilerplatePlugin.Boilerplate.settings 18 | 19 | -------------------------------------------------------------------------------- /project/build.properties: -------------------------------------------------------------------------------- 1 | sbt.version=0.13.5 2 | -------------------------------------------------------------------------------- /project/plugins.sbt: -------------------------------------------------------------------------------- 1 | addSbtPlugin("net.virtual-void" % "sbt-boilerplate" % "0.5.9") 2 | -------------------------------------------------------------------------------- /src/main/boilerplate/com/reactivedesignpatterns/Scoped.scala.template: -------------------------------------------------------------------------------- 1 | package com.reactivedesignpatterns 2 | 3 | object Scoped { 4 | [1..12#def scoped[[#T1#], U]([#v1: T1#])(f: ([#T1#]) => U): U = 5 | f([#v1#])# 6 | ] 7 | } 8 | -------------------------------------------------------------------------------- /src/main/scala/akka/rdpextras/AskPattern.scala: -------------------------------------------------------------------------------- 1 | package akka.rdpextras 2 | 3 | import akka.actor._ 4 | import akka.pattern._ 5 | import scala.concurrent.Future 6 | import akka.util.Timeout 7 | 8 | object AskPattern { 9 | 10 | def ask(actorRef: ActorRef, timeout: Timeout, f: ActorRef => Any): Future[Any] = actorRef match { 11 | case ref: InternalActorRef if ref.isTerminated ⇒ 12 | actorRef ! f(null) 13 | Future.failed[Any](new AskTimeoutException(s"Recipient[$actorRef] had already been terminated.")) 14 | case ref: InternalActorRef ⇒ 15 | if (timeout.duration.length <= 0) 16 | Future.failed[Any](new IllegalArgumentException(s"Timeout length must not be negative, question not sent to [$actorRef]")) 17 | else { 18 | val a = PromiseActorRef(ref.provider, timeout, targetName = actorRef.toString) 19 | actorRef.tell(f(a), a) 20 | a.result.future 21 | } 22 | case _ ⇒ Future.failed[Any](new IllegalArgumentException(s"Unsupported recipient ActorRef type, question not sent to [$actorRef]")) 23 | } 24 | 25 | } -------------------------------------------------------------------------------- /src/main/scala/com/reactivedesignpatterns/Defaults.scala: -------------------------------------------------------------------------------- 1 | package com.reactivedesignpatterns 2 | 3 | import scala.concurrent.duration._ 4 | import akka.actor.ActorRef 5 | import scala.concurrent.Future 6 | import akka.util.Timeout 7 | 8 | object Defaults { 9 | 10 | val Timestamp = Deadline 11 | type Timestamp = Deadline 12 | 13 | val SynchronousEventLoop = scala.concurrent.rdpextras.SynchronousEventLoop 14 | 15 | implicit class AskableActorRef(val ref: ActorRef) extends AnyVal { 16 | def ?(f: ActorRef => Any)(implicit timeout: Timeout): Future[Any] = akka.rdpextras.AskPattern.ask(ref, timeout, f) 17 | } 18 | 19 | } -------------------------------------------------------------------------------- /src/main/scala/com/reactivedesignpatterns/chapter4/EchoService.scala: -------------------------------------------------------------------------------- 1 | package com.reactivedesignpatterns.chapter4 2 | 3 | import akka.actor.Actor 4 | import akka.actor.ActorRef 5 | 6 | object EchoService { 7 | case class Request(tag: String, client: ActorRef) 8 | case class Response(tag: String) 9 | } 10 | 11 | class EchoService extends Actor { 12 | import EchoService._ 13 | 14 | def receive = { 15 | case Request(tag, ref) => ref ! Response(tag) 16 | } 17 | } -------------------------------------------------------------------------------- /src/main/scala/com/reactivedesignpatterns/chapter4/TranslationService.scala: -------------------------------------------------------------------------------- 1 | package com.reactivedesignpatterns.chapter4 2 | 3 | import scala.concurrent.ExecutionContext 4 | import scala.concurrent.Future 5 | 6 | class TranslationService { 7 | import ExecutionContext.Implicits.global 8 | 9 | def translate(input: String): Future[String] = Future { Thread.sleep(100); "How are you?" } 10 | 11 | def translate(input: String, ec: ExecutionContext): Future[String] = 12 | Future { Thread.sleep(100); "How are you?" }(ec) 13 | } 14 | -------------------------------------------------------------------------------- /src/main/scala/scala/concurrent/rdpextras/SynchronousEventLoop.scala: -------------------------------------------------------------------------------- 1 | package scala.concurrent.rdpextras 2 | 3 | import scala.concurrent.ExecutionContext 4 | import scala.concurrent.Future 5 | 6 | object SynchronousEventLoop extends ExecutionContext { 7 | override def execute(r: Runnable): Unit = Future.InternalCallbackExecutor.execute(r) 8 | override def reportFailure(t: Throwable): Unit = Future.InternalCallbackExecutor.reportFailure(t) 9 | } -------------------------------------------------------------------------------- /src/test/scala/com/reactivedesignpatterns/chapter4/EchoServiceSpec.scala: -------------------------------------------------------------------------------- 1 | package com.reactivedesignpatterns.chapter4 2 | 3 | import scala.concurrent.duration.{ DurationInt, FiniteDuration } 4 | import scala.util.Try 5 | import org.scalatest.{ BeforeAndAfterAll, Matchers, WordSpec } 6 | import com.reactivedesignpatterns.Scoped.scoped 7 | import com.reactivedesignpatterns.Defaults._ 8 | import akka.actor.{ Actor, ActorRef, ActorSystem, Props, actorRef2Scala } 9 | import akka.testkit.TestProbe 10 | import akka.util.Timeout 11 | import scala.concurrent.Await 12 | import scala.concurrent.Future 13 | import com.typesafe.config.ConfigFactory 14 | 15 | object EchoServiceSpec { 16 | import EchoService._ 17 | 18 | case class TestSLA(echo: ActorRef, n: Int, maxParallelism: Int, reportTo: ActorRef) 19 | case object AbortSLATest 20 | case class SLAResponse(timings: Seq[FiniteDuration], outstanding: Map[String, Timestamp]) 21 | 22 | class ParallelSLATester extends Actor { 23 | 24 | def receive = { 25 | case TestSLA(echo, n, maxParallelism, reportTo) => 26 | val receiver = context.actorOf(receiverProps(self)) 27 | // prime the request pipeline 28 | val sendNow = Math.min(n, maxParallelism) 29 | val outstanding = Map.empty ++ (for (_ <- 1 to sendNow) yield sendRequest(echo, receiver)) 30 | context.become(running(reportTo, echo, n - sendNow, receiver, outstanding, Nil)) 31 | } 32 | 33 | def running(reportTo: ActorRef, 34 | echo: ActorRef, 35 | remaining: Int, 36 | receiver: ActorRef, 37 | outstanding: Map[String, Timestamp], 38 | timings: List[FiniteDuration]): Receive = { 39 | case TimedResponse(Response(r), d) => 40 | val start = outstanding(r) 41 | scoped( 42 | outstanding - r + sendRequest(echo, receiver), 43 | (d - start) :: timings, 44 | remaining - 1 45 | ) { (outstanding, timings, remaining) => 46 | if (remaining > 0) 47 | context.become(running(reportTo, echo, remaining, receiver, outstanding, timings)) 48 | else 49 | context.become(finishing(reportTo, outstanding, timings)) 50 | } 51 | case AbortSLATest => 52 | context.stop(self) 53 | reportTo ! SLAResponse(timings, outstanding) 54 | } 55 | 56 | def finishing(reportTo: ActorRef, outstanding: Map[String, Timestamp], timings: List[FiniteDuration]): Receive = { 57 | case TimedResponse(Response(r), d) => 58 | val start = outstanding(r) 59 | scoped(outstanding - r, (d - start) :: timings) { (outstanding, timings) => 60 | if (outstanding.isEmpty) { 61 | context.stop(self) 62 | reportTo ! SLAResponse(timings, outstanding) 63 | } else context.become(finishing(reportTo, outstanding, timings)) 64 | } 65 | case AbortSLATest => 66 | context.stop(self) 67 | reportTo ! SLAResponse(timings, outstanding) 68 | } 69 | 70 | val idGenerator = Iterator from 1 map (i => s"test-$i") 71 | 72 | def sendRequest(echo: ActorRef, receiver: ActorRef): (String, Timestamp) = { 73 | val request = idGenerator.next 74 | val timestamp = Timestamp.now 75 | echo ! Request(request, receiver) 76 | request -> timestamp 77 | } 78 | } 79 | 80 | private def receiverProps(controller: ActorRef) = Props(new ParallelSLATestReceiver(controller)) 81 | private case class TimedResponse(r: Response, d: Timestamp) 82 | 83 | // timestamp received replies in a dedicated actor to keep timing distortions low 84 | private class ParallelSLATestReceiver(controller: ActorRef) extends Actor { 85 | def receive = { 86 | case r: Response => controller ! TimedResponse(r, Timestamp.now) 87 | } 88 | } 89 | 90 | } 91 | 92 | class EchoServiceSpec extends WordSpec with Matchers with BeforeAndAfterAll { 93 | import EchoServiceSpec._ 94 | 95 | // implicitly picked up to create TestProbes, lazy to only start when used 96 | implicit lazy val system = ActorSystem("EchoServiceSpec", ConfigFactory.parseString(""" 97 | akka.actor.default-dispatcher.fork-join-executor.parallelism-max = 3 98 | """)) 99 | 100 | /* 101 | * Discussion of the thread pool size configuration 102 | * 103 | * When using the default configuration of 8 threads or more (depending on 104 | * the number of processor cores available) the three active actors in the 105 | * test will bounce frequently between threads, incurring CPU cache misses 106 | * and wake-up latencies from low-power states. Depending on the precise 107 | * scheduling patterns for each given run this can lead to variable increases 108 | * in response latency. 109 | * 110 | * Configure a lower number than the number of active Actors means that 111 | * messages will be delayed by having to wait for their destination Actor 112 | * to be scheduled again. 113 | */ 114 | 115 | override def afterAll(): Unit = { 116 | system.shutdown() 117 | } 118 | 119 | private def echoService(name: String): ActorRef = system.actorOf(Props[EchoService], name) 120 | 121 | "An EchoService" must { 122 | import EchoService._ 123 | 124 | "reply correctly" in { 125 | val probe = TestProbe() 126 | val echo = echoService("replyCorrectly") 127 | echo ! Request("test", probe.ref) 128 | probe.expectMsg(1.second, Response("test")) 129 | } 130 | 131 | "keep its SLA" in { 132 | val probe = TestProbe() 133 | val echo = echoService("keepSLA") 134 | val N = 200 135 | val timings = for (i <- 1 to N) yield { 136 | val string = s"test$i" 137 | val start = Timestamp.now 138 | echo ! Request(string, probe.ref) 139 | probe.expectMsg(100.millis, s"test run $i", Response(string)) 140 | val stop = Timestamp.now 141 | stop - start 142 | } 143 | // discard top 5% 144 | val sorted = timings.sorted 145 | val ninetyfifthPercentile = sorted.dropRight(N * 5 / 100).last 146 | info(s"SLA min=${sorted.head} max=${sorted.last} 95th=$ninetyfifthPercentile") 147 | ninetyfifthPercentile should be < 1.millisecond 148 | } 149 | 150 | "keep its SLA when used in parallel with Futures" in { 151 | implicit val timeout = Timeout(100.millis) 152 | import system.dispatcher 153 | val echo = echoService("keepSLAfuture") 154 | val N = 10000 155 | val timingFutures = for (i <- 1 to N) yield { 156 | val string = s"test$i" 157 | val start = Timestamp.now 158 | (echo ? (Request(string, _))) collect { 159 | case Response(`string`) => Timestamp.now - start 160 | } 161 | } 162 | val futureOfTimings = Future.sequence(timingFutures) 163 | val timings = Await.result(futureOfTimings, 5.seconds) 164 | // discard top 5% 165 | val sorted = timings.sorted 166 | val ninetyfifthPercentile = sorted.dropRight(N * 5 / 100).last 167 | info(s"SLA min=${sorted.head} max=${sorted.last} 95th=$ninetyfifthPercentile") 168 | ninetyfifthPercentile should be < 100.milliseconds 169 | } 170 | 171 | "keep its SLA when used in parallel" in { 172 | val echo = echoService("keepSLAparallel") 173 | val probe = TestProbe() 174 | val N = 10000 175 | val maxParallelism = 500 176 | val controller = system.actorOf(Props[ParallelSLATester], "keepSLAparallelController") 177 | controller ! TestSLA(echo, N, maxParallelism, probe.ref) 178 | val result = Try(probe.expectMsgType[SLAResponse]).recover { 179 | case ae: AssertionError => 180 | controller ! AbortSLATest 181 | val result = probe.expectMsgType[SLAResponse] 182 | info(s"controller timed out, state so far is $result") 183 | throw ae 184 | }.get 185 | // discard top 5% 186 | val sorted = result.timings.sorted 187 | val ninetyfifthPercentile = sorted.dropRight(N * 5 / 100).last 188 | info(s"SLA min=${sorted.head} max=${sorted.last} 95th=$ninetyfifthPercentile") 189 | ninetyfifthPercentile should be < 2.milliseconds 190 | } 191 | 192 | } 193 | 194 | } -------------------------------------------------------------------------------- /src/test/scala/com/reactivedesignpatterns/chapter4/TranslationServiceSpec.scala: -------------------------------------------------------------------------------- 1 | package com.reactivedesignpatterns.chapter4 2 | 3 | import org.scalatest.WordSpec 4 | import org.scalatest.Matchers 5 | import com.reactivedesignpatterns.Defaults._ 6 | import scala.util.Success 7 | import scala.concurrent.ExecutionContext 8 | import scala.concurrent.Await 9 | import scala.concurrent.duration._ 10 | import org.scalatest.concurrent.Eventually 11 | 12 | class TranslationServiceSpec extends WordSpec with Matchers with Eventually { 13 | 14 | "A TranslationService" should { 15 | 16 | "correctly translate from Swedish" when { 17 | 18 | "using SynchronousEventLoop" in { 19 | val tr = new TranslationService 20 | val input = "Hur mår du?" 21 | val output = "How are you?" 22 | val ec = SynchronousEventLoop 23 | tr.translate(input, ec).value.get should be(Success(output)) 24 | } 25 | 26 | "using Await.result" in { 27 | val tr = new TranslationService 28 | val input = "Hur mår du?" 29 | val output = "How are you?" 30 | val future = tr.translate(input) 31 | Await.result(future, 1.second) should be(output) 32 | } 33 | 34 | "using eventually()" in { 35 | val tr = new TranslationService 36 | val input = "Hur mår du?" 37 | val output = "How are you?" 38 | val future = tr.translate(input) 39 | eventually { 40 | future.value.get should be(Success(output)) 41 | } 42 | } 43 | 44 | } 45 | 46 | "not respond immediately when running asynchronously" in { 47 | val tr = new TranslationService 48 | val input = "Hur mår du?" 49 | val output = "How are you?" 50 | val ec = ExecutionContext.global 51 | val future = tr.translate(input, ec) 52 | future.value should be(None) 53 | Await.result(future, 1.second) should be(output) 54 | } 55 | 56 | } 57 | 58 | } --------------------------------------------------------------------------------