| /* |
| * 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.catalina.tribes.util; |
| |
| import java.util.concurrent.BlockingQueue; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.RejectedExecutionException; |
| import java.util.concurrent.RejectedExecutionHandler; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.ThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| |
| public class ExecutorFactory { |
| protected static final StringManager sm = StringManager.getManager(ExecutorFactory.class.getPackage().getName()); |
| |
| public static ExecutorService newThreadPool(int minThreads, int maxThreads, long maxIdleTime, TimeUnit unit) { |
| TaskQueue taskqueue = new TaskQueue(); |
| ThreadPoolExecutor service = new TribesThreadPoolExecutor(minThreads, maxThreads, maxIdleTime, unit,taskqueue); |
| taskqueue.setParent(service); |
| return service; |
| } |
| |
| public static ExecutorService newThreadPool(int minThreads, int maxThreads, long maxIdleTime, TimeUnit unit, ThreadFactory threadFactory) { |
| TaskQueue taskqueue = new TaskQueue(); |
| ThreadPoolExecutor service = new TribesThreadPoolExecutor(minThreads, maxThreads, maxIdleTime, unit,taskqueue, threadFactory); |
| taskqueue.setParent(service); |
| return service; |
| } |
| |
| // ---------------------------------------------- TribesThreadPoolExecutor Inner Class |
| private static class TribesThreadPoolExecutor extends ThreadPoolExecutor { |
| public TribesThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, RejectedExecutionHandler handler) { |
| super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, handler); |
| } |
| |
| public TribesThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, |
| RejectedExecutionHandler handler) { |
| super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory, handler); |
| } |
| |
| public TribesThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory) { |
| super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory); |
| } |
| |
| public TribesThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue) { |
| super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue); |
| } |
| |
| @Override |
| public void execute(Runnable command) { |
| try { |
| super.execute(command); |
| } catch (RejectedExecutionException rx) { |
| if (super.getQueue() instanceof TaskQueue) { |
| TaskQueue queue = (TaskQueue)super.getQueue(); |
| if (!queue.force(command)) { |
| throw new RejectedExecutionException(sm.getString("executorFactory.queue.full")); |
| } |
| } |
| } |
| } |
| } |
| |
| // ---------------------------------------------- TaskQueue Inner Class |
| private static class TaskQueue extends LinkedBlockingQueue<Runnable> { |
| private static final long serialVersionUID = 1L; |
| |
| ThreadPoolExecutor parent = null; |
| |
| public TaskQueue() { |
| super(); |
| } |
| |
| public void setParent(ThreadPoolExecutor tp) { |
| parent = tp; |
| } |
| |
| public boolean force(Runnable o) { |
| if ( parent.isShutdown() ) throw new RejectedExecutionException(sm.getString("executorFactory.not.running")); |
| return super.offer(o); //forces the item onto the queue, to be used if the task is rejected |
| } |
| |
| @Override |
| public boolean offer(Runnable o) { |
| //we can't do any checks |
| if (parent==null) return super.offer(o); |
| //we are maxed out on threads, simply queue the object |
| if (parent.getPoolSize() == parent.getMaximumPoolSize()) return super.offer(o); |
| //we have idle threads, just add it to the queue |
| //this is an approximation, so it could use some tuning |
| if (parent.getActiveCount()<(parent.getPoolSize())) return super.offer(o); |
| //if we have less threads than maximum force creation of a new thread |
| if (parent.getPoolSize()<parent.getMaximumPoolSize()) return false; |
| //if we reached here, we need to add it to the queue |
| return super.offer(o); |
| } |
| } |
| } |