| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * 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. |
| */ |
| |
| package org.apache.geronimo.connector.work.pool; |
| |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.ThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** |
| * 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 $Rev$ $Date$ |
| */ |
| public class WorkExecutorPoolImpl implements WorkExecutorPool { |
| |
| /** |
| * A timed out pooled executor. |
| */ |
| private ThreadPoolExecutor pooledExecutor; |
| private static Log log = LogFactory.getLog(WorkExecutorPoolImpl.class); |
| |
| /** |
| * 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 ThreadPoolExecutor(1, maxSize, 60, TimeUnit.SECONDS, new LinkedBlockingQueue()); |
| /* |
| FIXME: How to do this with concurrent.util ? |
| pooledExecutor.waitWhenBlocked(); |
| */ |
| } |
| |
| /** |
| * Execute the specified Work. |
| * |
| * @param work Work to be executed. |
| */ |
| public void execute(Runnable work) { |
| if(pooledExecutor.getPoolSize() == pooledExecutor.getMaximumPoolSize()) { |
| log.warn("Maximum Pool size has been exceeded. Current Pool Size = "+pooledExecutor.getMaximumPoolSize()); |
| } |
| |
| 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.shutdown(); |
| return new NullWorkExecutorPool(maxSize); |
| } |
| |
| } |