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/* |
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* Copyright (C) 2008-2016, Google Inc. |
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* and other copyright owners as documented in the project's IP log. |
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* |
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* This program and the accompanying materials are made available |
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* under the terms of the Eclipse Distribution License v1.0 which |
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* accompanies this distribution, is reproduced below, and is |
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* available at http://www.eclipse.org/org/documents/edl-v10.php |
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* |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials provided |
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* with the distribution. |
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* |
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* - Neither the name of the Eclipse Foundation, Inc. nor the |
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* names of its contributors may be used to endorse or promote |
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* products derived from this software without specific prior |
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* written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package org.eclipse.jgit.lib; |
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import java.util.concurrent.Executors; |
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import java.util.concurrent.ScheduledThreadPoolExecutor; |
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import java.util.concurrent.ThreadFactory; |
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/** |
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* Simple work queue to run tasks in the background |
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*/ |
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class WorkQueue { |
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private static final ScheduledThreadPoolExecutor executor; |
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static final Object executorKiller; |
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static { |
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// To support garbage collection, start our thread but |
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// swap out the thread factory. When our class is GC'd |
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// the executorKiller will finalize and ask the executor |
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// to shutdown, ending the worker. |
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// |
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int threads = 1; |
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executor = new ScheduledThreadPoolExecutor(threads, |
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new ThreadFactory() { |
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private final ThreadFactory baseFactory = Executors |
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.defaultThreadFactory(); |
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public Thread newThread(Runnable taskBody) { |
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Thread thr = baseFactory.newThread(taskBody); |
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thr.setName("JGit-WorkQueue"); //$NON-NLS-1$ |
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thr.setDaemon(true); |
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return thr; |
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} |
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}); |
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executor.setRemoveOnCancelPolicy(true); |
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executor.setContinueExistingPeriodicTasksAfterShutdownPolicy(false); |
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executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false); |
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executor.prestartAllCoreThreads(); |
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// Now that the threads are running, its critical to swap out |
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// our own thread factory for one that isn't in the ClassLoader. |
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// This allows the class to GC. |
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// |
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executor.setThreadFactory(Executors.defaultThreadFactory()); |
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executorKiller = new Object() { |
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@Override |
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protected void finalize() { |
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executor.shutdownNow(); |
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} |
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}; |
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} |
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static ScheduledThreadPoolExecutor getExecutor() { |
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return executor; |
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} |
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} |