/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. The ASF licenses this file to You
* 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. For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.roller.business.runnable;
import EDU.oswego.cs.dl.util.concurrent.BoundedBuffer;
import EDU.oswego.cs.dl.util.concurrent.DirectExecutor;
import EDU.oswego.cs.dl.util.concurrent.PooledExecutor;
import EDU.oswego.cs.dl.util.concurrent.ThreadFactory;
import java.util.Date;
import java.util.Timer;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Manage Roller's thread use.
*/
public class ThreadManagerImpl implements ThreadManager {
private static Log log = LogFactory.getLog(ThreadManagerImpl.class);
private PooledExecutor backgroundExecutor = null;
private DirectExecutor nodelayExecutor = null;
private Timer scheduler = null;
public ThreadManagerImpl() {
log.info("Intializing Thread Manager");
backgroundExecutor = new PooledExecutor(new BoundedBuffer(10), 25);
backgroundExecutor.setMinimumPoolSize(4);
backgroundExecutor.setKeepAliveTime(1000 * 60 * 5);
backgroundExecutor.waitWhenBlocked();
backgroundExecutor.createThreads(9);
backgroundExecutor.setThreadFactory(new ThreadFactory() {
public Thread newThread(Runnable command) {
Thread t = new Thread(command);
t.setDaemon(false);
t.setName("Background Execution Threads");
t.setPriority(Thread.NORM_PRIORITY);
return t;
}
});
nodelayExecutor = new DirectExecutor();
scheduler = new Timer(true);
}
public void executeInBackground(Runnable runnable)
throws InterruptedException {
backgroundExecutor.execute(runnable);
}
public void executeInForeground(Runnable runnable)
throws InterruptedException {
nodelayExecutor.execute(runnable);
}
public void scheduleFixedRateTimerTask(RollerTask task, Date startTime, long intervalMins) {
if (intervalMins < MIN_RATE_INTERVAL_MINS) {
throw new IllegalArgumentException("Interval (" + intervalMins +
") shorter than minimum allowed (" + MIN_RATE_INTERVAL_MINS + ")");
}
scheduler.scheduleAtFixedRate(task, startTime, intervalMins * 60 * 1000);
}
public void shutdown() {
log.debug("starting shutdown sequence");
// trigger an immediate shutdown of any backgrounded tasks
backgroundExecutor.shutdownNow();
// TODO: it appears that this doesn't affect tasks which may be running
// when this is called and that may not be what we want. It would be
// nice if shutdown() meant shutdown immediately.
scheduler.cancel();
}
public void release() {
}
public boolean acquireLock(RollerTask task) {
return true;
}
public boolean releaseLock(RollerTask task) {
return true;
}
public boolean isLocked(RollerTask task) {
return false;
}
}