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