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Java example source code file (TestingExecutorsTest.java)

This example Java source code file (TestingExecutorsTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

boolean, callable, cancellationexception, executionexception, future, interruptedexception, listeningscheduledexecutorservice, override, runnable, runtimeexception, scheduledfuture, should, testcase, threading, threads, util

The TestingExecutorsTest.java Java example source code

/*
 * Copyright (C) 2012 The Guava Authors
 *
 * 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 com.google.common.util.concurrent.testing;

import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.ListeningScheduledExecutorService;

import junit.framework.TestCase;

import java.lang.InterruptedException;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

/**
 * Tests for TestingExecutors.
 *
 * @author Eric Chang
 */
public class TestingExecutorsTest extends TestCase {
  private volatile boolean taskDone;

  public void testNoOpScheduledExecutor() throws InterruptedException {
    taskDone = false;
    Runnable task = new Runnable() {
      @Override public void run() {
        taskDone = true;
      }
    };
    ScheduledFuture<?> future = TestingExecutors.noOpScheduledExecutor().schedule(
        task, 10, TimeUnit.MILLISECONDS);
    Thread.sleep(20);
    assertFalse(taskDone);
    assertFalse(future.isDone());
  }

  public void testNoOpScheduledExecutorShutdown() {
    ListeningScheduledExecutorService executor = TestingExecutors.noOpScheduledExecutor();
    assertFalse(executor.isShutdown());
    assertFalse(executor.isTerminated());
    executor.shutdown();
    assertTrue(executor.isShutdown());
    assertTrue(executor.isTerminated());
  }

  public void testNoOpScheduledExecutorInvokeAll() throws ExecutionException, InterruptedException {
    ListeningScheduledExecutorService executor = TestingExecutors.noOpScheduledExecutor();
    taskDone = false;
    Callable<Boolean> task = new Callable() {
      @Override public Boolean call() {
        taskDone = true;
        return taskDone;
      }
    };
    List<Future futureList = executor.invokeAll(
        ImmutableList.of(task), 10, TimeUnit.MILLISECONDS);
    Future<Boolean> future = futureList.get(0);
    assertFalse(taskDone);
    assertTrue(future.isDone());
    try {
      future.get();
      fail();
    } catch (CancellationException e) {
      // pass
    }
  }

  public void testSameThreadScheduledExecutor() throws ExecutionException, InterruptedException {
    taskDone = false;
    Callable<Integer> task = new Callable() {
      @Override public Integer call() {
        taskDone = true;
        return 6;
      }
    };
    Future<Integer> future = TestingExecutors.sameThreadScheduledExecutor().schedule(
        task, 10000, TimeUnit.MILLISECONDS);
    assertTrue("Should run callable immediately", taskDone);
    assertEquals(6, (int) future.get());
  }

  public void testSameThreadScheduledExecutorWithException() throws InterruptedException {
    Runnable runnable = new Runnable() {
      @Override public void run() {
        throw new RuntimeException("Oh no!");
      }
    };

    Future<?> future = TestingExecutors.sameThreadScheduledExecutor().submit(runnable);
    try {
      future.get();
      fail("Should have thrown exception");
    } catch (ExecutionException e) {
      // pass
    }
  }
}

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