| /* |
| * 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; |
| } |
| } |