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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();
-
- 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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