/* * Copyright 1999-2011 Alibaba Group. * * 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 com.alibaba.dubbo.common.threadpool.support.fixed; import java.util.concurrent.Executor; import java.util.concurrent.LinkedBlockingQueue; import java.util.concurrent.SynchronousQueue; import java.util.concurrent.ThreadPoolExecutor; import java.util.concurrent.TimeUnit; import com.alibaba.dubbo.common.Constants; import com.alibaba.dubbo.common.URL; import com.alibaba.dubbo.common.threadpool.ThreadPool; import com.alibaba.dubbo.common.threadpool.support.AbortPolicyWithReport; import com.alibaba.dubbo.common.utils.NamedThreadFactory; /** * 此线程池启动时即创建固定大小的线程数,不做任何伸缩,来源于:<code>Executors.newFixedThreadPool()</code> * * @see java.util.concurrent.Executors#newFixedThreadPool(int) * @author william.liangf */ public class FixedThreadPool implements ThreadPool { public Executor getExecutor(URL url) { String name = url.getParameter(Constants.THREAD_NAME_KEY, Constants.DEFAULT_THREAD_NAME); int threads = url.getParameter(Constants.THREADS_KEY, Constants.DEFAULT_THREADS); int queues = url.getParameter(Constants.QUEUES_KEY, Constants.DEFAULT_QUEUES); return new ThreadPoolExecutor(threads, threads, 0, TimeUnit.MILLISECONDS, queues == 0 ? new SynchronousQueue<Runnable>() : (queues < 0 ? new LinkedBlockingQueue<Runnable>() : new LinkedBlockingQueue<Runnable>(queues)), new NamedThreadFactory(name, true), new AbortPolicyWithReport(name, url)); } }