alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (ExecutionListTest.java)

This example Java source code file (ExecutionListTest.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

atomicinteger, countdownlatch, exception, executionlist, executionlisttest, executor, interruptedexception, mockrunnable, override, runnable, runtimeexception, testcase, threading, threads, throwing_runnable

The ExecutionListTest.java Java example source code

/*
 * Copyright (C) 2007 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;

import static com.google.common.util.concurrent.MoreExecutors.directExecutor;

import com.google.common.testing.NullPointerTester;

import junit.framework.TestCase;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * Unit tests for {@link ExecutionList}.
 *
 * @author Nishant Thakkar
 * @author Sven Mawson
 */
public class ExecutionListTest extends TestCase {

  private final ExecutionList list = new ExecutionList();

  public void testRunOnPopulatedList() throws Exception {
    Executor exec = Executors.newCachedThreadPool();
    CountDownLatch countDownLatch = new CountDownLatch(3);
    list.add(new MockRunnable(countDownLatch), exec);
    list.add(new MockRunnable(countDownLatch), exec);
    list.add(new MockRunnable(countDownLatch), exec);
    assertEquals(countDownLatch.getCount(), 3L);

    list.execute();

    // Verify that all of the runnables execute in a reasonable amount of time.
    assertTrue(countDownLatch.await(1L, TimeUnit.SECONDS));
  }

  public void testExecute_idempotent() {
    final AtomicInteger runCalled = new AtomicInteger();
    list.add(new Runnable() {
      @Override public void run() {
        runCalled.getAndIncrement();
      }
    }, directExecutor());
    list.execute();
    assertEquals(1, runCalled.get());
    list.execute();
    assertEquals(1, runCalled.get());
  }

  public void testExecute_idempotentConcurrently() throws InterruptedException {
    final CountDownLatch okayToRun = new CountDownLatch(1);
    final AtomicInteger runCalled = new AtomicInteger();
    list.add(new Runnable() {
      @Override public void run() {
        try {
          okayToRun.await();
        } catch (InterruptedException e) {
          Thread.currentThread().interrupt();
          throw new RuntimeException(e);
        }
        runCalled.getAndIncrement();
      }
    }, directExecutor());
    Runnable execute = new Runnable() {
      @Override public void run() {
        list.execute();
      }
    };
    Thread thread1 = new Thread(execute);
    Thread thread2 = new Thread(execute);
    thread1.start();
    thread2.start();
    assertEquals(0, runCalled.get());
    okayToRun.countDown();
    thread1.join();
    thread2.join();
    assertEquals(1, runCalled.get());
  }

  public void testAddAfterRun() throws Exception {
    // Run the previous test
    testRunOnPopulatedList();

    // If it passed, then verify an Add will be executed without calling run
    CountDownLatch countDownLatch = new CountDownLatch(1);
    list.add(new MockRunnable(countDownLatch),  Executors.newCachedThreadPool());
    assertTrue(countDownLatch.await(1L, TimeUnit.SECONDS));
  }

  public void testOrdering() throws Exception {
    final AtomicInteger integer = new AtomicInteger();
    for (int i = 0; i < 10; i++) {
      final int expectedCount = i;
      list.add(
          new Runnable() {
            @Override public void run() {
              integer.compareAndSet(expectedCount, expectedCount + 1);
            }
          },
          MoreExecutors.directExecutor());
    }
    list.execute();
    assertEquals(10, integer.get());
  }

  private class MockRunnable implements Runnable {
    CountDownLatch countDownLatch;

    MockRunnable(CountDownLatch countDownLatch) {
      this.countDownLatch = countDownLatch;
    }

    @Override public void run() {
      countDownLatch.countDown();
    }
  }

  public void testExceptionsCaught() {
    list.add(THROWING_RUNNABLE, directExecutor());
    list.execute();
    list.add(THROWING_RUNNABLE, directExecutor());
  }

  public void testNulls() {
    new NullPointerTester().testAllPublicInstanceMethods(new ExecutionList());
  }

  private static final Runnable THROWING_RUNNABLE = new Runnable() {
    @Override public void run() {
      throw new RuntimeException();
    }
  };
}

Other Java examples (source code examples)

Here is a short list of links related to this Java ExecutionListTest.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.