Adding BasicThreadFactory class. Same as Oliver's original patch in LANG-582, with an @since 3.0 added
git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@916095 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Henri Yandell
parent
cf74865561
commit
e0ddfa767c
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@ -0,0 +1,379 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.lang3.concurrent;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ThreadFactory;
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import java.util.concurrent.atomic.AtomicLong;
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/**
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* <p>
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* An implementation of the {@code ThreadFactory} interface that provides some
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* configuration options for the threads it creates.
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* </p>
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* <p>
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* A {@code ThreadFactory} is used for instance by an {@code ExecutorService} to
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* create the threads it uses for executing tasks. In many cases users do not
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* have to care about a {@code ThreadFactory} because the default one used by an
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* {@code ExecutorService} will do. However, if there are special requirements
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* for the threads, a custom {@code ThreadFactory} has to be created.
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* </p>
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* <p>
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* This class provides some frequently needed configuration options for the
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* threads it creates. These are the following:
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* <ul>
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* <li>A name pattern for the threads created by this factory can be specified.
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* This is often useful if an application uses multiple executor services for
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* different purposes. If the names of the threads used by these services have
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* meaningful names, log output or exception traces can be much easier to read.
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* Naming patterns are <em>format strings</em> as used by the {@code
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* String.format()} method. The string can contain the place holder {@code %d}
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* which will be replaced by the number of the current thread ({@code
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* ThreadFactoryImpl} keeps a counter of the threads it has already created).
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* For instance, the naming pattern {@code "My %d. worker thread"} will result
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* in thread names like {@code "My 1. worker thread"}, {@code
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* "My 2. worker thread"} and so on.</li>
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* <li>A flag whether the threads created by this factory should be daemon
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* threads. This can impact the exit behavior of the current Java application
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* because the JVM shuts down if there are only daemon threads running.</li>
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* <li>The priority of the thread. Here an integer value can be provided. The
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* {@code java.lang.Thread} class defines constants for valid ranges of priority
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* values.</li>
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* <li>The {@code UncaughtExceptionHandler} for the thread. This handler is
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* called if an uncaught exception occurs within the thread.</li>
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* </ul>
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* </p>
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* <p>
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* {@code BasicThreadFactory} wraps another thread factory which actually
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* creates new threads. The configuration options are set on the threads created
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* by the wrapped thread factory. On construction time the factory to be wrapped
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* can be specified. If none is provided, a default {@code ThreadFactory} is
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* used.
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* </p>
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* <p>
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* Instances of {@code BasicThreadFactory} are not created directly, but the
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* nested {@code Builder} class is used for this purpose. Using the builder only
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* the configuration options an application is interested in need to be set. The
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* following example shows how a {@code BasicThreadFactory} is created and
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* installed in an {@code ExecutorService}:
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*
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* <pre>
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* // Create a factory that produces daemon threads with a naming pattern and
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* // a priority
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* BasicThreadFactory factory = new BasicThreadFactory.Builder()
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* .namingPattern("workerthread-%d")
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* .daemon(true)
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* .priority(Thread.MAX_PRIORITY)
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* .build();
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* // Create an executor service for single-threaded execution
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* ExecutorService exec = Executors.newSingleThreadExecutor(factory);
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* </pre>
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* </p>
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*
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* @version $Id: $
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* @since 3.0
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*/
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public class BasicThreadFactory implements ThreadFactory {
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/** A counter for the threads created by this factory. */
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private final AtomicLong threadCounter;
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/** Stores the wrapped factory. */
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private final ThreadFactory wrappedFactory;
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/** Stores the uncaught exception handler. */
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private final Thread.UncaughtExceptionHandler uncaughtExceptionHandler;
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/** Stores the naming pattern for newly created threads. */
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private final String namingPattern;
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/** Stores the priority. */
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private final Integer priority;
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/** Stores the daemon status flag. */
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private final Boolean daemonFlag;
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/**
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* Creates a new instance of {@code ThreadFactoryImpl} and configures it
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* from the specified {@code Builder} object.
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*
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* @param builder the {@code Builder} object
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*/
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private BasicThreadFactory(Builder builder) {
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if (builder.wrappedFactory == null) {
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wrappedFactory = Executors.defaultThreadFactory();
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} else {
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wrappedFactory = builder.wrappedFactory;
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}
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namingPattern = builder.namingPattern;
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priority = builder.priority;
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daemonFlag = builder.daemonFlag;
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uncaughtExceptionHandler = builder.exceptionHandler;
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threadCounter = new AtomicLong();
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}
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/**
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* Returns the wrapped {@code ThreadFactory}. This factory is used for
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* actually creating threads. This method never returns <b>null</b>. If no
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* {@code ThreadFactory} was passed when this object was created, a default
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* thread factory is returned.
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*
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* @return the wrapped {@code ThreadFactory}
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*/
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public final ThreadFactory getWrappedFactory() {
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return wrappedFactory;
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}
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/**
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* Returns the naming pattern for naming newly created threads. Result can
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* be <b>null</b> if no naming pattern was provided.
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*
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* @return the naming pattern
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*/
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public final String getNamingPattern() {
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return namingPattern;
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}
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/**
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* Returns the daemon flag. This flag determines whether newly created
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* threads should be daemon threads. If <b>true</b>, this factory object
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* calls {@code setDaemon(true)} on the newly created threads. Result can be
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* <b>null</b> if no daemon flag was provided at creation time.
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*
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* @return the daemon flag
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*/
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public final Boolean getDaemonFlag() {
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return daemonFlag;
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}
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/**
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* Returns the priority of the threads created by this factory. Result can
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* be <b>null</b> if no priority was specified.
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*
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* @return the priority for newly created threads
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*/
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public final Integer getPriority() {
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return priority;
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}
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/**
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* Returns the {@code UncaughtExceptionHandler} for the threads created by
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* this factory. Result can be <b>null</b> if no handler was provided.
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*
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* @return the {@code UncaughtExceptionHandler}
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*/
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public final Thread.UncaughtExceptionHandler getUncaughtExceptionHandler() {
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return uncaughtExceptionHandler;
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}
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/**
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* Returns the number of threads this factory has already created. This
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* class maintains an internal counter that is incremented each time the
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* {@link #newThread(Runnable)} method is invoked.
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*
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* @return the number of threads created by this factory
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*/
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public long getThreadCount() {
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return threadCounter.get();
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}
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/**
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* Creates a new thread. This implementation delegates to the wrapped
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* factory for creating the thread. Then, on the newly created thread the
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* corresponding configuration options are set.
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*
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* @param r the {@code Runnable} to be executed by the new thread
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* @return the newly created thread
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*/
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public Thread newThread(Runnable r) {
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Thread t = getWrappedFactory().newThread(r);
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initializeThread(t);
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return t;
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}
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/**
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* Initializes the specified thread. This method is called by
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* {@link #newThread(Runnable)} after a new thread has been obtained from
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* the wrapped thread factory. It initializes the thread according to the
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* options set for this factory.
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*
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* @param t the thread to be initialized
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*/
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private void initializeThread(Thread t) {
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long count = threadCounter.incrementAndGet();
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if (getNamingPattern() != null) {
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t.setName(String.format(getNamingPattern(), count));
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}
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if (getUncaughtExceptionHandler() != null) {
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t.setUncaughtExceptionHandler(getUncaughtExceptionHandler());
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}
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if (getPriority() != null) {
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t.setPriority(getPriority().intValue());
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}
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if (getDaemonFlag() != null) {
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t.setDaemon(getDaemonFlag().booleanValue());
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}
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}
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/**
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* <p>
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* A <em>builder</em> class for creating instances of {@code
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* BasicThreadFactory}.
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* </p>
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* <p>
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* Using this builder class instances of {@code BasicThreadFactory} can be
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* created and initialized. The class provides methods that correspond to
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* the configuration options supported by {@code BasicThreadFactory}. Method
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* chaining is supported. Refer to the documentation of {@code
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* BasicThreadFactory} for a usage example.
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* </p>
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*
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* @version $Id: $
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*/
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public static class Builder {
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/** The wrapped factory. */
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private ThreadFactory wrappedFactory;
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/** The uncaught exception handler. */
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private Thread.UncaughtExceptionHandler exceptionHandler;
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/** The naming pattern. */
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private String namingPattern;
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/** The priority. */
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private Integer priority;
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/** The daemon flag. */
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private Boolean daemonFlag;
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/**
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* Sets the {@code ThreadFactory} to be wrapped by the new {@code
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* BasicThreadFactory}.
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*
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* @param factory the wrapped {@code ThreadFactory} (must not be
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* <b>null</b>)
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* @return a reference to this {@code Builder}
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* @throws NullPointerException if the passed in {@code ThreadFactory}
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* is <b>null</b>
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*/
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public Builder wrappedFactory(ThreadFactory factory) {
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if (factory == null) {
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throw new NullPointerException(
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"Wrapped ThreadFactory must not be null!");
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}
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wrappedFactory = factory;
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return this;
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}
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/**
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* Sets the naming pattern to be used by the new {@code
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* BasicThreadFactory}.
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*
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* @param pattern the naming pattern (must not be <b>null</b>)
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* @return a reference to this {@code Builder}
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* @throws NullPointerException if the naming pattern is <b>null</b>
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*/
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public Builder namingPattern(String pattern) {
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if (pattern == null) {
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throw new NullPointerException(
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"Naming pattern must not be null!");
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}
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namingPattern = pattern;
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return this;
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}
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/**
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* Sets the daemon flag for the new {@code BasicThreadFactory}. If this
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* flag is set to <b>true</b> the new thread factory will create daemon
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* threads.
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*
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* @param f the value of the daemon flag
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* @return a reference to this {@code Builder}
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*/
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public Builder daemon(boolean f) {
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daemonFlag = Boolean.valueOf(f);
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return this;
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}
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/**
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* Sets the priority for the threads created by the new {@code
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* BasicThreadFactory}.
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*
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* @param prio the priority
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* @return a reference to this {@code Builder}
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*/
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public Builder priority(int prio) {
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priority = Integer.valueOf(prio);
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return this;
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}
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/**
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* Sets the uncaught exception handler for the threads created by the
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* new {@code BasicThreadFactory}.
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*
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* @param handler the {@code UncaughtExceptionHandler} (must not be
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* <b>null</b>)
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* @return a reference to this {@code Builder}
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* @throws NullPointerException if the exception handler is <b>null</b>
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*/
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public Builder uncaughtExceptionHandler(
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Thread.UncaughtExceptionHandler handler) {
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if (handler == null) {
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throw new NullPointerException(
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"Uncaught exception handler must not be null!");
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}
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exceptionHandler = handler;
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return this;
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}
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/**
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* Resets this builder. All configuration options are set to default
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* values. Note: If the {@link #build()} method was called, it is not
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* necessary to call {@code reset()} explicitly because this is done
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* automatically.
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*/
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public void reset() {
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wrappedFactory = null;
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exceptionHandler = null;
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namingPattern = null;
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priority = null;
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daemonFlag = null;
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}
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/**
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* Creates a new {@code BasicThreadFactory} with all configuration
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* options that have been specified by calling methods on this builder.
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* After creating the factory {@link #reset()} is called.
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*
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* @return the new {@code BasicThreadFactory}
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*/
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public BasicThreadFactory build() {
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BasicThreadFactory factory = new BasicThreadFactory(this);
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reset();
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return factory;
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}
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}
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}
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@ -0,0 +1,302 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.lang3.concurrent;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertNotSame;
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import static org.junit.Assert.assertNull;
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import static org.junit.Assert.assertSame;
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import static org.junit.Assert.assertTrue;
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import java.util.concurrent.ThreadFactory;
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import org.easymock.EasyMock;
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import org.junit.Before;
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import org.junit.Test;
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/**
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* Test class for {@code BasicThreadFactory}.
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*
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* @version $Id: $
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*/
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public class BasicThreadFactoryTest {
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/** Constant for the test naming pattern. */
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private static final String PATTERN = "testThread-%d";
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/** The builder for creating a thread factory. */
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private BasicThreadFactory.Builder builder;
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@Before
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public void setUp() throws Exception {
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builder = new BasicThreadFactory.Builder();
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}
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/**
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* Tests the default options of a thread factory.
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*
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* @param factory the factory to be checked
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*/
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private void checkFactoryDefaults(BasicThreadFactory factory) {
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assertNull("Got a naming pattern", factory.getNamingPattern());
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assertNull("Got an exception handler", factory
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.getUncaughtExceptionHandler());
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assertNull("Got a priority", factory.getPriority());
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assertNull("Got a daemon flag", factory.getDaemonFlag());
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assertNotNull("No wrapped factory", factory.getWrappedFactory());
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}
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/**
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* Tests the default values used by the builder.
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*/
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@Test
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public void testBuildDefaults() {
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BasicThreadFactory factory = builder.build();
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checkFactoryDefaults(factory);
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}
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/**
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* Tries to set a null naming pattern.
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*/
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@Test(expected = NullPointerException.class)
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public void testBuildNamingPatternNull() {
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builder.namingPattern(null);
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}
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/**
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* Tries to set a null wrapped factory.
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*/
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@Test(expected = NullPointerException.class)
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public void testBuildWrappedFactoryNull() {
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builder.wrappedFactory(null);
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}
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/**
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* Tries to set a null exception handler.
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*/
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@Test(expected = NullPointerException.class)
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public void testBuildUncaughtExceptionHandlerNull() {
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builder.uncaughtExceptionHandler(null);
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}
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/**
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* Tests the reset() method of the builder.
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*/
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@Test
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public void testBuilderReset() {
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ThreadFactory wrappedFactory = EasyMock.createMock(ThreadFactory.class);
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Thread.UncaughtExceptionHandler exHandler = EasyMock
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.createMock(Thread.UncaughtExceptionHandler.class);
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EasyMock.replay(wrappedFactory, exHandler);
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builder.namingPattern(PATTERN).daemon(true).priority(
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Thread.MAX_PRIORITY).uncaughtExceptionHandler(exHandler)
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.wrappedFactory(wrappedFactory);
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builder.reset();
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BasicThreadFactory factory = builder.build();
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checkFactoryDefaults(factory);
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assertNotSame("Wrapped factory not reset", wrappedFactory, factory
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.getWrappedFactory());
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EasyMock.verify(wrappedFactory, exHandler);
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}
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/**
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* Tests whether reset() is automatically called after build().
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*/
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@Test
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public void testBuilderResetAfterBuild() {
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builder.wrappedFactory(EasyMock.createNiceMock(ThreadFactory.class))
|
||||
.namingPattern(PATTERN).daemon(true).build();
|
||||
checkFactoryDefaults(builder.build());
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests whether the naming pattern is applied to new threads.
|
||||
*/
|
||||
@Test
|
||||
public void testNewThreadNamingPattern() {
|
||||
ThreadFactory wrapped = EasyMock.createMock(ThreadFactory.class);
|
||||
Runnable r = EasyMock.createMock(Runnable.class);
|
||||
final int count = 12;
|
||||
for (int i = 0; i < count; i++) {
|
||||
EasyMock.expect(wrapped.newThread(r)).andReturn(new Thread());
|
||||
}
|
||||
EasyMock.replay(wrapped, r);
|
||||
BasicThreadFactory factory = builder.wrappedFactory(wrapped)
|
||||
.namingPattern(PATTERN).build();
|
||||
for (int i = 0; i < count; i++) {
|
||||
Thread t = factory.newThread(r);
|
||||
assertEquals("Wrong thread name", String.format(PATTERN, Long
|
||||
.valueOf(i + 1)), t.getName());
|
||||
assertEquals("Wrong thread count", i + 1, factory.getThreadCount());
|
||||
}
|
||||
EasyMock.verify(wrapped, r);
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests whether the thread name is not modified if no naming pattern is
|
||||
* set.
|
||||
*/
|
||||
@Test
|
||||
public void testNewThreadNoNamingPattern() {
|
||||
ThreadFactory wrapped = EasyMock.createMock(ThreadFactory.class);
|
||||
Runnable r = EasyMock.createMock(Runnable.class);
|
||||
final String name = "unchangedThreadName";
|
||||
Thread t = new Thread(name);
|
||||
EasyMock.expect(wrapped.newThread(r)).andReturn(t);
|
||||
EasyMock.replay(wrapped, r);
|
||||
BasicThreadFactory factory = builder.wrappedFactory(wrapped).build();
|
||||
assertSame("Wrong thread", t, factory.newThread(r));
|
||||
assertEquals("Name was changed", name, t.getName());
|
||||
EasyMock.verify(wrapped, r);
|
||||
}
|
||||
|
||||
/**
|
||||
* Helper method for testing whether the daemon flag is taken into account.
|
||||
*
|
||||
* @param flag the value of the flag
|
||||
*/
|
||||
private void checkDaemonFlag(boolean flag) {
|
||||
ThreadFactory wrapped = EasyMock.createMock(ThreadFactory.class);
|
||||
Runnable r = EasyMock.createMock(Runnable.class);
|
||||
Thread t = new Thread();
|
||||
EasyMock.expect(wrapped.newThread(r)).andReturn(t);
|
||||
EasyMock.replay(wrapped, r);
|
||||
BasicThreadFactory factory = builder.wrappedFactory(wrapped).daemon(
|
||||
flag).build();
|
||||
assertSame("Wrong thread", t, factory.newThread(r));
|
||||
assertEquals("Wrong daemon flag", flag, t.isDaemon());
|
||||
EasyMock.verify(wrapped, r);
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests whether daemon threads can be created.
|
||||
*/
|
||||
@Test
|
||||
public void testNewThreadDaemonTrue() {
|
||||
checkDaemonFlag(true);
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests whether the daemon status of new threads can be turned off.
|
||||
*/
|
||||
@Test
|
||||
public void testNewThreadDaemonFalse() {
|
||||
checkDaemonFlag(false);
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests whether the daemon flag is not touched on newly created threads if
|
||||
* it is not specified.
|
||||
*/
|
||||
@Test
|
||||
public void testNewThreadNoDaemonFlag() {
|
||||
ThreadFactory wrapped = EasyMock.createMock(ThreadFactory.class);
|
||||
Runnable r1 = EasyMock.createMock(Runnable.class);
|
||||
Runnable r2 = EasyMock.createMock(Runnable.class);
|
||||
Thread t1 = new Thread();
|
||||
Thread t2 = new Thread();
|
||||
t1.setDaemon(true);
|
||||
EasyMock.expect(wrapped.newThread(r1)).andReturn(t1);
|
||||
EasyMock.expect(wrapped.newThread(r2)).andReturn(t2);
|
||||
EasyMock.replay(wrapped, r1, r2);
|
||||
BasicThreadFactory factory = builder.wrappedFactory(wrapped).build();
|
||||
assertSame("Wrong thread 1", t1, factory.newThread(r1));
|
||||
assertTrue("No daemon thread", t1.isDaemon());
|
||||
assertSame("Wrong thread 2", t2, factory.newThread(r2));
|
||||
assertFalse("A daemon thread", t2.isDaemon());
|
||||
EasyMock.verify(wrapped, r1, r2);
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests whether the priority is set on newly created threads.
|
||||
*/
|
||||
@Test
|
||||
public void testNewThreadPriority() {
|
||||
ThreadFactory wrapped = EasyMock.createMock(ThreadFactory.class);
|
||||
Runnable r = EasyMock.createMock(Runnable.class);
|
||||
Thread t = new Thread();
|
||||
EasyMock.expect(wrapped.newThread(r)).andReturn(t);
|
||||
EasyMock.replay(wrapped, r);
|
||||
final int priority = Thread.NORM_PRIORITY + 1;
|
||||
BasicThreadFactory factory = builder.wrappedFactory(wrapped).priority(
|
||||
priority).build();
|
||||
assertSame("Wrong thread", t, factory.newThread(r));
|
||||
assertEquals("Wrong priority", priority, t.getPriority());
|
||||
EasyMock.verify(wrapped, r);
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests whether the original priority is not changed if no priority is
|
||||
* specified.
|
||||
*/
|
||||
@Test
|
||||
public void testNewThreadNoPriority() {
|
||||
ThreadFactory wrapped = EasyMock.createMock(ThreadFactory.class);
|
||||
Runnable r = EasyMock.createMock(Runnable.class);
|
||||
final int orgPriority = Thread.NORM_PRIORITY + 1;
|
||||
Thread t = new Thread();
|
||||
t.setPriority(orgPriority);
|
||||
EasyMock.expect(wrapped.newThread(r)).andReturn(t);
|
||||
EasyMock.replay(wrapped, r);
|
||||
BasicThreadFactory factory = builder.wrappedFactory(wrapped).build();
|
||||
assertSame("Wrong thread", t, factory.newThread(r));
|
||||
assertEquals("Wrong priority", orgPriority, t.getPriority());
|
||||
EasyMock.verify(wrapped, r);
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests whether the exception handler is set if one is provided.
|
||||
*/
|
||||
@Test
|
||||
public void testNewThreadExHandler() {
|
||||
ThreadFactory wrapped = EasyMock.createMock(ThreadFactory.class);
|
||||
Runnable r = EasyMock.createMock(Runnable.class);
|
||||
Thread.UncaughtExceptionHandler handler = EasyMock
|
||||
.createMock(Thread.UncaughtExceptionHandler.class);
|
||||
Thread t = new Thread();
|
||||
EasyMock.expect(wrapped.newThread(r)).andReturn(t);
|
||||
EasyMock.replay(wrapped, r, handler);
|
||||
BasicThreadFactory factory = builder.wrappedFactory(wrapped)
|
||||
.uncaughtExceptionHandler(handler).build();
|
||||
assertSame("Wrong thread", t, factory.newThread(r));
|
||||
assertEquals("Wrong exception handler", handler, t
|
||||
.getUncaughtExceptionHandler());
|
||||
EasyMock.verify(wrapped, r, handler);
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests whether the original exception hander is not touched if none is
|
||||
* specified.
|
||||
*/
|
||||
@Test
|
||||
public void testNewThreadNoExHandler() {
|
||||
ThreadFactory wrapped = EasyMock.createMock(ThreadFactory.class);
|
||||
Runnable r = EasyMock.createMock(Runnable.class);
|
||||
Thread.UncaughtExceptionHandler handler = EasyMock
|
||||
.createMock(Thread.UncaughtExceptionHandler.class);
|
||||
Thread t = new Thread();
|
||||
t.setUncaughtExceptionHandler(handler);
|
||||
EasyMock.expect(wrapped.newThread(r)).andReturn(t);
|
||||
EasyMock.replay(wrapped, r, handler);
|
||||
BasicThreadFactory factory = builder.wrappedFactory(wrapped).build();
|
||||
assertSame("Wrong thread", t, factory.newThread(r));
|
||||
assertEquals("Wrong exception handler", handler, t
|
||||
.getUncaughtExceptionHandler());
|
||||
EasyMock.verify(wrapped, r, handler);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue