org.scalatest.concurrent.ConductorMethods.scala Maven / Gradle / Ivy
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/*
* Copyright 2001-2013 Artima, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.scalatest.concurrent
import org.scalatest._
import java.util.concurrent.atomic.AtomicReference
import _root_.java.util.concurrent.Callable
import org.scalatest.OutcomeOf.outcomeOf
/**
* Trait that provides each test with access to a new Conductor
* via methods.
*
*
* Here's an example of the use of this trait to test the ArrayBlockingQueue
* concurrency abstraction from java.util.concurrent:
*
*
*
* import org.scalatest.FunSuite
* import org.scalatest.concurrent.ConductorMethods
* import org.scalatest.matchers.Matchers
* import java.util.concurrent.ArrayBlockingQueue
*
* class ArrayBlockingQueueSuite extends FunSuite with ConductorMethods with Matchers {
*
* test("calling put on a full queue blocks the producer thread") {
*
* val buf = new ArrayBlockingQueue[Int](1)
*
* thread("producer") {
* buf put 42
* buf put 17
* beat should be (1)
* }
*
* thread("consumer") {
* waitForBeat(1)
* buf.take should be (42)
* buf.take should be (17)
* }
*
* whenFinished {
* buf should be ('empty)
* }
* }
*
* test("calling take on an empty queue blocks the consumer thread") {
*
* val buf = new ArrayBlockingQueue[Int](1)
*
* thread("producer") {
* waitForBeat(1)
* buf put 42
* buf put 17
* }
*
* thread("consumer") {
* buf.take should be (42)
* buf.take should be (17)
* beat should be (1)
* }
*
* whenFinished {
* buf should be ('empty)
* }
* }
* }
*
*
*
* For an explanation of how these tests work, see the documentation for Conductors.
*
*
* @author Josh Cough
* @author Bill Venners
*/
trait ConductorMethods extends TestSuiteMixin with Conductors { this: TestSuite =>
private val conductor = new AtomicReference[Conductor]()
/**
* Create a new thread that will execute the given function.
* If the test is started, then the thread will run the function immediately.
* If it is not yet started, the Thread will wait to run the function until
* all threads are up and ready to go.
* @param f the function to be executed by the thread
*/
protected def thread(f: => Any): Thread = conductor.get.thread{ f }
/**
* Create a new thread that will execute the given function.
* If the test is started, then the thread will run the function immediately.
* If it is not yet started, the Thread will wait to run the function until
* all threads are up and ready to go.
* @param name the name of the thread
* @param f the function to be executed by the thread
*/
protected def threadNamed(name: String)(f: => Unit): Thread = conductor.get.threadNamed(name){ f }
/*
* Create a new thread that will execute the given Runnable
* @param runnable the Runnable to be executed by the thread
*/
// def thread[T](runnable: Runnable): Thread = conductor.get.thread(runnable)
/*
* Create a new thread that will execute the given Runnable
* @param name the name of the thread
* @param runnable the Runnable to be executed by the thread
*/
// def thread[T](name: String, runnable: Runnable): Thread = conductor.get.thread(name,runnable)
/*
* Create a new thread that will execute the given Callable
* @param callable the Callable to be executed by the thread
*/
// def thread[T](callable: Callable[T]): Thread = conductor.get.thread(callable)
/*
* Create a new thread that will execute the given Callable
* @param name the name of the thread
* @param callable the Callable to be executed by the thread
*/
// def thread[T](name: String, callable: Callable[T]): Thread = conductor.get.thread(name,callable)
/**
* Force the current thread to block until the thread clock reaches the
* specified value, at which point the current thread is unblocked.
* @param c the tick value to wait for
*/
protected def waitForBeat(beat:Int): Succeeded.type = conductor.get.waitForBeat(beat)
/**
* Run the passed function, ensuring the clock does not advance while the function is running
* (has not yet returned or thrown an exception).
*/
protected def withConductorFrozen[T](f: => T): T = conductor.get.withConductorFrozen(f)
/**
* Check if the clock has been frozen by any threads. (The only way a thread
* can freeze the clock is by calling withClockFrozen.)
*/
protected def isConductorFrozen: Boolean = conductor.get.isConductorFrozen
/**
* Gets the current value of the clock. Primarily useful in assert statements.
* @return the current tick value
*/
protected def beat: Int = conductor.get.beat
/**
* Register a function to be executed after the simulation has finished.
*/
protected def whenFinished(fun: => Assertion): Assertion = conductor.get.whenFinished { fun }
/**
* Creates and initializes a private instance variable with a new Conductor,
* ensuring it is visible to any thread, invokes the passed test function,
* and invokes conduct on the Conductor, if it
* was not already invoked by the test.
*
*
* This trait is stackable with other traits that override withFixture(NoArgTest), because
* instead of invoking the test function directly, it delegates responsibility for invoking the test
* function to super.withFixture(NoArgTest).
*
*/
abstract override def withFixture(test: NoArgTest): Outcome = {
conductor.compareAndSet(conductor.get, new Conductor)
super.withFixture(test) match {
case Succeeded if !conductor.get.conductingHasBegun =>
outcomeOf { conductor.get.conduct() }
case other => other
}
}
}
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