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/*
* Copyright (C) 2008-2016, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.lib.internal;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadFactory;
/**
* Simple work queue to run tasks in the background
*/
public 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.setContextClassLoader(null);
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();
}
};
}
/**
* Get the WorkQueue's executor
*
* @return the WorkQueue's executor
*/
public static ScheduledThreadPoolExecutor getExecutor() {
return executor;
}
}
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