/*
* @(#)$Id$
*
* Copyright 2006-2008 Makoto YUI
*
* 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.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.util.concurrent;
import java.io.Closeable;
import java.io.IOException;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.Semaphore;
import javax.annotation.concurrent.ThreadSafe;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
@ThreadSafe
public final class BoundedWorkQueueExecutor implements Executor, Closeable {
private final ExecutorService executor;
private final Semaphore semaphore;
public BoundedWorkQueueExecutor(ExecutorService exec, int bound) {
this.executor = exec;
this.semaphore = new Semaphore(bound);
}
public BoundedWorkQueueExecutor(int threadPoolSize, int workQueueSize, String threadName) {
this.executor = ExecutorFactory.newFixedThreadPool(threadPoolSize, threadName);
int bound = workQueueSize + threadPoolSize;
this.semaphore = new Semaphore(bound);
}
public void execute(Runnable command) {
try {
semaphore.acquire();
} catch (InterruptedException e) {
throw new RejectedExecutionException(e);
}
try {
executor.execute(command);
} catch (RejectedExecutionException ree) {
throw ree;
} finally {
semaphore.release();
}
}
public void close() throws IOException {
executor.shutdown();
}
}