--- /dev/null
+//
+// ========================================================================
+// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
+// ------------------------------------------------------------------------
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the Eclipse Public License v1.0
+// and Apache License v2.0 which accompanies this distribution.
+//
+// The Eclipse Public License is available at
+// http://www.eclipse.org/legal/epl-v10.html
+//
+// The Apache License v2.0 is available at
+// http://www.opensource.org/licenses/apache2.0.php
+//
+// You may elect to redistribute this code under either of these licenses.
+// ========================================================================
+//
+
+package org.eclipse.jetty.util.thread;
+
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.RejectedExecutionException;
+import java.util.concurrent.SynchronousQueue;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+
+import org.eclipse.jetty.util.component.AbstractLifeCycle;
+import org.eclipse.jetty.util.component.LifeCycle;
+import org.eclipse.jetty.util.log.Log;
+import org.eclipse.jetty.util.log.Logger;
+
+/* ------------------------------------------------------------ */
+/**
+ * Jetty ThreadPool using java 5 ThreadPoolExecutor
+ * This class wraps a {@link ExecutorService} as a {@link ThreadPool} and
+ * {@link LifeCycle} interfaces so that it may be used by the Jetty <code>org.eclipse.jetty.server.Server</code>
+ */
+public class ExecutorThreadPool extends AbstractLifeCycle implements ThreadPool, LifeCycle
+{
+ private static final Logger LOG = Log.getLogger(ExecutorThreadPool.class);
+ private final ExecutorService _executor;
+
+ /* ------------------------------------------------------------ */
+ public ExecutorThreadPool(ExecutorService executor)
+ {
+ _executor = executor;
+ }
+
+ /* ------------------------------------------------------------ */
+ /**
+ * Wraps an {@link ThreadPoolExecutor}.
+ * Max pool size is 256, pool thread timeout after 60 seconds and
+ * an unbounded {@link LinkedBlockingQueue} is used for the job queue;
+ */
+ public ExecutorThreadPool()
+ {
+ // Using an unbounded queue makes the maxThreads parameter useless
+ // Refer to ThreadPoolExecutor javadocs for details
+ this(new ThreadPoolExecutor(256, 256, 60, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>()));
+ }
+
+ /* ------------------------------------------------------------ */
+ /**
+ * Wraps an {@link ThreadPoolExecutor}.
+ * Max pool size is 256, pool thread timeout after 60 seconds, and core pool size is 32 when queueSize >= 0.
+ * @param queueSize can be -1 for using an unbounded {@link LinkedBlockingQueue}, 0 for using a
+ * {@link SynchronousQueue}, greater than 0 for using a {@link ArrayBlockingQueue} of the given size.
+ */
+ public ExecutorThreadPool(int queueSize)
+ {
+ this(queueSize < 0 ? new ThreadPoolExecutor(256, 256, 60, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>()) :
+ queueSize == 0 ? new ThreadPoolExecutor(32, 256, 60, TimeUnit.SECONDS, new SynchronousQueue<Runnable>()) :
+ new ThreadPoolExecutor(32, 256, 60, TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(queueSize)));
+ }
+
+ /* ------------------------------------------------------------ */
+ /**
+ * Wraps an {@link ThreadPoolExecutor} using
+ * an unbounded {@link LinkedBlockingQueue} is used for the jobs queue;
+ * @param corePoolSize must be equal to maximumPoolSize
+ * @param maximumPoolSize the maximum number of threads to allow in the pool
+ * @param keepAliveTime the max time a thread can remain idle, in milliseconds
+ */
+ public ExecutorThreadPool(int corePoolSize, int maximumPoolSize, long keepAliveTime)
+ {
+ this(corePoolSize, maximumPoolSize, keepAliveTime, TimeUnit.MILLISECONDS);
+ }
+
+ /* ------------------------------------------------------------ */
+ /**
+ * Wraps an {@link ThreadPoolExecutor} using
+ * an unbounded {@link LinkedBlockingQueue} is used for the jobs queue.
+ * @param corePoolSize must be equal to maximumPoolSize
+ * @param maximumPoolSize the maximum number of threads to allow in the pool
+ * @param keepAliveTime the max time a thread can remain idle
+ * @param unit the unit for the keepAliveTime
+ */
+ public ExecutorThreadPool(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit)
+ {
+ this(corePoolSize, maximumPoolSize, keepAliveTime, unit, new LinkedBlockingQueue<Runnable>());
+ }
+
+ /* ------------------------------------------------------------ */
+
+ /**
+ * Wraps an {@link ThreadPoolExecutor}
+ * @param corePoolSize the number of threads to keep in the pool, even if they are idle
+ * @param maximumPoolSize the maximum number of threads to allow in the pool
+ * @param keepAliveTime the max time a thread can remain idle
+ * @param unit the unit for the keepAliveTime
+ * @param workQueue the queue to use for holding tasks before they are executed
+ */
+ public ExecutorThreadPool(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue)
+ {
+ this(new ThreadPoolExecutor(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue));
+ }
+
+
+ /* ------------------------------------------------------------ */
+ @Override
+ public void execute(Runnable job)
+ {
+ _executor.execute(job);
+ }
+
+ /* ------------------------------------------------------------ */
+ public boolean dispatch(Runnable job)
+ {
+ try
+ {
+ _executor.execute(job);
+ return true;
+ }
+ catch(RejectedExecutionException e)
+ {
+ LOG.warn(e);
+ return false;
+ }
+ }
+
+ /* ------------------------------------------------------------ */
+ public int getIdleThreads()
+ {
+ if (_executor instanceof ThreadPoolExecutor)
+ {
+ final ThreadPoolExecutor tpe = (ThreadPoolExecutor)_executor;
+ return tpe.getPoolSize() - tpe.getActiveCount();
+ }
+ return -1;
+ }
+
+ /* ------------------------------------------------------------ */
+ public int getThreads()
+ {
+ if (_executor instanceof ThreadPoolExecutor)
+ {
+ final ThreadPoolExecutor tpe = (ThreadPoolExecutor)_executor;
+ return tpe.getPoolSize();
+ }
+ return -1;
+ }
+
+ /* ------------------------------------------------------------ */
+ public boolean isLowOnThreads()
+ {
+ if (_executor instanceof ThreadPoolExecutor)
+ {
+ final ThreadPoolExecutor tpe = (ThreadPoolExecutor)_executor;
+ // getActiveCount() locks the thread pool, so execute it last
+ return tpe.getPoolSize() == tpe.getMaximumPoolSize() &&
+ tpe.getQueue().size() >= tpe.getPoolSize() - tpe.getActiveCount();
+ }
+ return false;
+ }
+
+ /* ------------------------------------------------------------ */
+ public void join() throws InterruptedException
+ {
+ _executor.awaitTermination(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
+ }
+
+ /* ------------------------------------------------------------ */
+ @Override
+ protected void doStop() throws Exception
+ {
+ super.doStop();
+ _executor.shutdownNow();
+ }
+}
projects / gigi.git / blobdiff