/**
*
* Copyright 2003-2004 The Apache Software Foundation
*
* 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 org.apache.geronimo.connector.work.pool;
import EDU.oswego.cs.dl.util.concurrent.Channel;
import EDU.oswego.cs.dl.util.concurrent.PooledExecutor;
import org.apache.geronimo.connector.work.WorkerContext;
/**
* PooledExecutor enforcing a timed out "blocked execution policy". The works
* submitted to this pooled executor MUST be a WorkWrapper.
*
* @version $Rev: 46019 $ $Date: 2004-09-14 02:56:06 -0700 (Tue, 14 Sep 2004) $
*/
public class TimedOutPooledExecutor extends PooledExecutor {
/**
* Creates a pooled executor. The Channel used to enqueue the submitted
* Work instance is a queueless synchronous one.
*/
public TimedOutPooledExecutor() {
setBlockedExecutionHandler(new TimedOutSpinHandler());
}
/**
* Creates a pooled executor, which uses the provided Channel as its
* queueing mechanism.
*
* @param aChannel Channel to be used to enqueue the submitted Work
* intances.
*/
public TimedOutPooledExecutor(Channel aChannel) {
super(aChannel);
setBlockedExecutionHandler(new TimedOutSpinHandler());
}
/**
* Executes the provided task, which MUST be an instance of WorkWrapper.
*
* @throws IllegalArgumentException Indicates that the provided task is not
* a WorkWrapper instance.
*/
public void execute(Runnable aTask) throws InterruptedException {
if (!(aTask instanceof WorkerContext)) {
throw new IllegalArgumentException("Please submit a WorkWrapper.");
}
super.execute(aTask);
}
/**
* This class implements a time out policy when a work is blocked: it offers
* the task to the pool until the work has timed out.
*
* @version $Rev: 46019 $ $Date: 2004-09-14 02:56:06 -0700 (Tue, 14 Sep 2004) $
*/
private class TimedOutSpinHandler
implements PooledExecutor.BlockedExecutionHandler {
/* (non-Javadoc)
* @see EDU.oswego.cs.dl.util.concurrent.PooledExecutor.BlockedExecutionHandler#blockedAction(java.lang.Runnable)
*/
public boolean blockedAction(Runnable arg0) throws InterruptedException {
WorkerContext work = (WorkerContext) arg0;
if (!handOff_.offer(arg0, work.getStartTimeout())) {
// double check.
if (work.isTimedOut()) {
return false;
}
return true;
}
return true;
}
}
}