从dubbo中找到的:
/** * 此线程池可伸缩,线程空闲一分钟后回收,新请求重新创建线程,来源于:<code>Executors.newCachedThreadPool()</code> * * @see java.util.concurrent.Executors#newCachedThreadPool() * @author william.liangf */ public class CachedThreadPool implements ThreadPool { public Executor getExecutor(URL url) { String name = url.getParameter(Constants.THREAD_NAME_KEY, Constants.DEFAULT_THREAD_NAME); int cores = url.getParameter(Constants.CORE_THREADS_KEY, Constants.DEFAULT_CORE_THREADS); int threads = url.getParameter(Constants.THREADS_KEY, Integer.MAX_VALUE); int queues = url.getParameter(Constants.QUEUES_KEY, Constants.DEFAULT_QUEUES); int alive = url.getParameter(Constants.ALIVE_KEY, Constants.DEFAULT_ALIVE); return new ThreadPoolExecutor(cores, threads, alive, TimeUnit.MILLISECONDS, queues == 0 ? new SynchronousQueue<Runnable>() : (queues < 0 ? new LinkedBlockingQueue<Runnable>() : new LinkedBlockingQueue<Runnable>(queues)), new NamedThreadFactory(name, true), new AbortPolicyWithReport(name, url)); } }
/** * 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)); } }
/** * 此线程池一直增长,直到上限,增长后不收缩。 * * @author <a href="mailto:[email protected]">kimi</a> */ public class LimitedThreadPool implements ThreadPool { public Executor getExecutor(URL url) { String name = url.getParameter(Constants.THREAD_NAME_KEY, Constants.DEFAULT_THREAD_NAME); int cores = url.getParameter(Constants.CORE_THREADS_KEY, Constants.DEFAULT_CORE_THREADS); int threads = url.getParameter(Constants.THREADS_KEY, Constants.DEFAULT_THREADS); int queues = url.getParameter(Constants.QUEUES_KEY, Constants.DEFAULT_QUEUES); return new ThreadPoolExecutor(cores, threads, Long.MAX_VALUE, TimeUnit.MILLISECONDS, queues == 0 ? new SynchronousQueue<Runnable>() : (queues < 0 ? new LinkedBlockingQueue<Runnable>() : new LinkedBlockingQueue<Runnable>(queues)), new NamedThreadFactory(name, true), new AbortPolicyWithReport(name, url)); } }
public class AbortPolicyWithReport extends ThreadPoolExecutor.AbortPolicy { protected static final Logger logger = LoggerFactory.getLogger(AbortPolicyWithReport.class); private final String threadName; private final URL url; public AbortPolicyWithReport(String threadName, URL url) { this.threadName = threadName; this.url = url; } @Override public void rejectedExecution(Runnable r, ThreadPoolExecutor e) { String msg = String.format("Thread pool is EXHAUSTED!" + " Thread Name: %s, Pool Size: %d (active: %d, core: %d, max: %d, largest: %d), Task: %d (completed: %d)," + " Executor status:(isShutdown:%s, isTerminated:%s, isTerminating:%s), in %s://%s:%d!" , threadName, e.getPoolSize(), e.getActiveCount(), e.getCorePoolSize(), e.getMaximumPoolSize(), e.getLargestPoolSize(), e.getTaskCount(), e.getCompletedTaskCount(), e.isShutdown(), e.isTerminated(), e.isTerminating(), url.getProtocol(), url.getIp(), url.getPort()); logger.warn(msg); throw new RejectedExecutionException(msg); } }