/**
*
* 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 javax.resource.spi.work.WorkCompletedException;
import javax.resource.spi.work.WorkException;
import EDU.oswego.cs.dl.util.concurrent.Channel;
import EDU.oswego.cs.dl.util.concurrent.PooledExecutor;
import EDU.oswego.cs.dl.util.concurrent.LinkedQueue;
import org.apache.geronimo.connector.work.WorkerContext;
/**
* Based class for WorkExecutorPool. Sub-classes define the synchronization
* policy (should the call block until the end of the work; or when it starts
* et cetera).
*
* @version $Revision: 1.1 $ $Date: 2004/07/06 17:15:54 $
*/
public class WorkExecutorPoolImpl implements WorkExecutorPool {
/**
* A timed out pooled executor.
*/
private PooledExecutor pooledExecutor;
/**
* Creates a pool with the specified minimum and maximum sizes. The Channel
* used to enqueue the submitted Work instances is queueless synchronous
* one.
*
* @param maxSize Maximum size of the work executor pool.
*/
public WorkExecutorPoolImpl(int maxSize) {
pooledExecutor = new PooledExecutor(new LinkedQueue(), maxSize);
pooledExecutor.setMinimumPoolSize(maxSize);
pooledExecutor.waitWhenBlocked();
}
/**
* Creates a pool with the specified minimum and maximum sizes and using the
* specified Channel to enqueue the submitted Work instances.
*
* @param channel Queue to be used as the queueing facility of this pool.
* @param maxSize Maximum size of the work executor pool.
*/
public WorkExecutorPoolImpl(
Channel channel,
int maxSize) {
pooledExecutor = new PooledExecutor(channel, maxSize);
pooledExecutor.setMinimumPoolSize(maxSize);
pooledExecutor.waitWhenBlocked();
}
/**
* Execute the specified Work.
*
* @param work Work to be executed.
*
* @exception InterruptedException Indicates that the Work execution has been
* unsuccessful.
*/
public void execute(Runnable work) throws InterruptedException {
pooledExecutor.execute(work);
}
/**
* Gets the size of this pool.
*/
public int getPoolSize() {
return pooledExecutor.getPoolSize();
}
/**
* Gets the maximum size of this pool.
*/
public int getMaximumPoolSize() {
return pooledExecutor.getMaximumPoolSize();
}
/**
* Sets the maximum size of this pool.
* @param maxSize New maximum size of this pool.
*/
public void setMaximumPoolSize(int maxSize) {
pooledExecutor.setMaximumPoolSize(maxSize);
}
public WorkExecutorPool start() {
throw new IllegalStateException("This pooled executor is already started");
}
/**
* Stops this pool. Prior to stop this pool, all the enqueued Work instances
* are processed. This is an orderly shutdown.
*/
public WorkExecutorPool stop() {
int maxSize = getMaximumPoolSize();
pooledExecutor.shutdownAfterProcessingCurrentlyQueuedTasks();
return new NullWorkExecutorPool(maxSize);
}
}