| // Copyright (C) 2009 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.gerrit.git; |
| |
| import java.util.concurrent.ScheduledThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| |
| public class WorkQueue { |
| private static ScheduledThreadPoolExecutor pool; |
| |
| public static synchronized void schedule(final Runnable task, |
| final long delay, final TimeUnit unit) { |
| if (pool == null) { |
| pool = new ScheduledThreadPoolExecutor(1); |
| pool.setKeepAliveTime(60, TimeUnit.SECONDS); |
| pool.setMaximumPoolSize(5); |
| } |
| pool.schedule(task, delay, unit); |
| } |
| |
| public static void terminate() { |
| final ScheduledThreadPoolExecutor p = shutdown(); |
| if (p != null) { |
| boolean isTerminated; |
| do { |
| try { |
| isTerminated = p.awaitTermination(10, TimeUnit.SECONDS); |
| } catch (InterruptedException ie) { |
| isTerminated = false; |
| } |
| } while (!isTerminated); |
| } |
| } |
| |
| private static synchronized ScheduledThreadPoolExecutor shutdown() { |
| final ScheduledThreadPoolExecutor p = pool; |
| if (p != null) { |
| p.shutdown(); |
| pool = null; |
| return p; |
| } |
| return null; |
| } |
| } |