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Java example source code file (ThreadFactoryBuilderTest.java)

This example Java source code file (ThreadFactoryBuilderTest.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

illegalargumentexception, interruptedexception, nullpointertester, override, runnable, string, testcase, thread, thread_priority, threadfactory, threadfactorybuilder, threadfactorybuildertest, threading, threads, uncaught_exception_handler, uncaughtexceptionhandler, util

The ThreadFactoryBuilderTest.java Java example source code

/*
 * Copyright (C) 2010 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.truth.Truth.assertThat;

import com.google.common.testing.NullPointerTester;

import junit.framework.TestCase;

import java.lang.Thread.UncaughtExceptionHandler;
import java.util.Locale;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

/**
 * Tests for ThreadFactoryBuilder.
 *
 * @author Kurt Alfred Kluever
 * @author Martin Buchholz
 */
public class ThreadFactoryBuilderTest extends TestCase {
  private final Runnable monitoredRunnable = new Runnable() {
    @Override public void run() {
      completed = true;
    }
  };

  private static final UncaughtExceptionHandler UNCAUGHT_EXCEPTION_HANDLER =
      new UncaughtExceptionHandler() {
        @Override public void uncaughtException(Thread t, Throwable e) {
          // No-op
        }
      };

  private ThreadFactoryBuilder builder;
  private volatile boolean completed = false;

  @Override public void setUp() {
    builder = new ThreadFactoryBuilder();
  }

  public void testThreadFactoryBuilder_defaults() throws InterruptedException {
    ThreadFactory threadFactory = builder.build();
    Thread thread = threadFactory.newThread(monitoredRunnable);
    checkThreadPoolName(thread, 1);

    Thread defaultThread =
        Executors.defaultThreadFactory().newThread(monitoredRunnable);
    assertEquals(defaultThread.isDaemon(), thread.isDaemon());
    assertEquals(defaultThread.getPriority(), thread.getPriority());
    assertSame(defaultThread.getThreadGroup(), thread.getThreadGroup());
    assertSame(defaultThread.getUncaughtExceptionHandler(),
        thread.getUncaughtExceptionHandler());

    assertFalse(completed);
    thread.start();
    thread.join();
    assertTrue(completed);

    // Creating a new thread from the same ThreadFactory will have the same
    // pool ID but a thread ID of 2.
    Thread thread2 = threadFactory.newThread(monitoredRunnable);
    checkThreadPoolName(thread2, 2);
    assertEquals(
        thread.getName().substring(0, thread.getName().lastIndexOf('-')),
        thread2.getName().substring(0, thread.getName().lastIndexOf('-')));

    // Building again should give us a different pool ID.
    ThreadFactory threadFactory2 = builder.build();
    Thread thread3 = threadFactory2.newThread(monitoredRunnable);
    checkThreadPoolName(thread3, 1);
    assertThat(
        thread2.getName().substring(0, thread.getName().lastIndexOf('-')))
        .isNotEqualTo(
            thread3.getName().substring(0, thread.getName().lastIndexOf('-')));
  }

  private static void checkThreadPoolName(Thread thread, int threadId) {
    assertThat(thread.getName()).matches("^pool-\\d+-thread-" + threadId + "$");
  }

  public void testNameFormatWithPercentS_custom() {
    String format = "super-duper-thread-%s";
    ThreadFactory factory = builder.setNameFormat(format).build();
    for (int i = 0; i < 11; i++) {
      assertEquals(rootLocaleFormat(format, i),
          factory.newThread(monitoredRunnable).getName());
    }
  }

  public void testNameFormatWithPercentD_custom() {
    String format = "super-duper-thread-%d";
    ThreadFactory factory = builder.setNameFormat(format).build();
    for (int i = 0; i < 11; i++) {
      assertEquals(rootLocaleFormat(format, i),
          factory.newThread(monitoredRunnable).getName());
    }
  }

  public void testDaemon_false() {
    ThreadFactory factory = builder.setDaemon(false).build();
    Thread thread = factory.newThread(monitoredRunnable);
    assertFalse(thread.isDaemon());
  }

  public void testDaemon_true() {
    ThreadFactory factory = builder.setDaemon(true).build();
    Thread thread = factory.newThread(monitoredRunnable);
    assertTrue(thread.isDaemon());
  }

  public void testPriority_custom() {
    for (int i = Thread.MIN_PRIORITY; i <= Thread.MAX_PRIORITY; i++) {
      ThreadFactory factory = builder.setPriority(i).build();
      Thread thread = factory.newThread(monitoredRunnable);
      assertEquals(i, thread.getPriority());
    }
  }

  public void testPriority_tooLow() {
    try {
      builder.setPriority(Thread.MIN_PRIORITY - 1);
      fail();
    } catch (IllegalArgumentException expected) {
    }
  }

  public void testPriority_tooHigh() {
    try {
      builder.setPriority(Thread.MAX_PRIORITY + 1);
      fail();
    } catch (IllegalArgumentException expected) {
    }
  }

  public void testUncaughtExceptionHandler_custom() {
    assertEquals(UNCAUGHT_EXCEPTION_HANDLER,
        builder.setUncaughtExceptionHandler(UNCAUGHT_EXCEPTION_HANDLER).build()
        .newThread(monitoredRunnable).getUncaughtExceptionHandler());
  }

  public void testBuildMutateBuild() {
    ThreadFactory factory1 = builder.setPriority(1).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

    ThreadFactory factory2 = builder.setPriority(2).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());
    assertEquals(2, factory2.newThread(monitoredRunnable).getPriority());
  }

  public void testBuildTwice() {
    ThreadFactory unused;
    unused = builder.build();  // this is allowed
    unused = builder.build();  // this is *also* allowed
  }

  public void testBuildMutate() {
    ThreadFactory factory1 = builder.setPriority(1).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

    builder.setPriority(2);  // change the state of the builder
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());
  }

  public void testThreadFactory() throws InterruptedException {
    final String THREAD_NAME = "ludicrous speed";
    final int THREAD_PRIORITY = 1;
    final boolean THREAD_DAEMON = false;
    ThreadFactory backingThreadFactory = new ThreadFactory() {
      @Override public Thread newThread(Runnable r) {
        Thread thread = new Thread(r);
        thread.setName(THREAD_NAME);
        thread.setPriority(THREAD_PRIORITY);
        thread.setDaemon(THREAD_DAEMON);
        thread.setUncaughtExceptionHandler(UNCAUGHT_EXCEPTION_HANDLER);
        return thread;
      }
    };

    Thread thread = builder.setThreadFactory(backingThreadFactory).build()
        .newThread(monitoredRunnable);

    assertEquals(THREAD_NAME, thread.getName());
    assertEquals(THREAD_PRIORITY, thread.getPriority());
    assertEquals(THREAD_DAEMON, thread.isDaemon());
    assertSame(UNCAUGHT_EXCEPTION_HANDLER,
        thread.getUncaughtExceptionHandler());
    assertSame(Thread.State.NEW, thread.getState());

    assertFalse(completed);
    thread.start();
    thread.join();
    assertTrue(completed);
  }

  public void testNulls() {
    NullPointerTester npTester = new NullPointerTester();
    npTester.testAllPublicConstructors(ThreadFactoryBuilder.class);
    npTester.testAllPublicStaticMethods(ThreadFactoryBuilder.class);
    npTester.testAllPublicInstanceMethods(builder);
  }

  private static String rootLocaleFormat(String format, Object... args) {
    return String.format(Locale.ROOT, format, args);
  }
}

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