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// Copyright 2009 Google Inc.
//
// 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;
}
}
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