You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@hc.apache.org by ol...@apache.org on 2007/06/05 22:24:09 UTC
svn commit: r544618 -
/jakarta/httpcomponents/httpcore/trunk/module-nio/src/test/java/org/apache/http/nio/mockup/SimpleThreadPoolExecutor.java
Author: olegk
Date: Tue Jun 5 13:24:09 2007
New Revision: 544618
URL: http://svn.apache.org/viewvc?view=rev&rev=544618
Log:
Added Executor implementation that re-uses existing pooled threads if available or spawns a new one if not. The Executor#execute method of this implementation never blocks. To be used in unit tests.
Added:
jakarta/httpcomponents/httpcore/trunk/module-nio/src/test/java/org/apache/http/nio/mockup/SimpleThreadPoolExecutor.java (with props)
Added: jakarta/httpcomponents/httpcore/trunk/module-nio/src/test/java/org/apache/http/nio/mockup/SimpleThreadPoolExecutor.java
URL: http://svn.apache.org/viewvc/jakarta/httpcomponents/httpcore/trunk/module-nio/src/test/java/org/apache/http/nio/mockup/SimpleThreadPoolExecutor.java?view=auto&rev=544618
==============================================================================
--- jakarta/httpcomponents/httpcore/trunk/module-nio/src/test/java/org/apache/http/nio/mockup/SimpleThreadPoolExecutor.java (added)
+++ jakarta/httpcomponents/httpcore/trunk/module-nio/src/test/java/org/apache/http/nio/mockup/SimpleThreadPoolExecutor.java Tue Jun 5 13:24:09 2007
@@ -0,0 +1,222 @@
+/*
+ * $HeadURL$
+ * $Revision$
+ * $Date$
+ *
+ * ====================================================================
+ * 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package org.apache.http.nio.mockup;
+
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.Set;
+
+import org.apache.http.util.concurrent.Executor;
+
+/**
+ * Simple {@link Executor} implementation that re-uses existing pooled threads
+ * if available or spawns a new one if not. The {@link Executor#execute(Runnable)}
+ * method of this implementation never blocks.
+ *
+ * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
+ */
+public class SimpleThreadPoolExecutor implements Executor {
+
+ private static final int MAX_WAIT_TIME = 5000;
+
+ private final ThreadPool threadPool;
+
+ private volatile boolean shutdown;
+
+ public SimpleThreadPoolExecutor() {
+ super();
+ this.threadPool = new ThreadPool();
+ }
+
+ public void execute(final Runnable task) {
+ if (task == null) {
+ return;
+ }
+ if (this.shutdown) {
+ throw new IllegalStateException("Executor shut down");
+ }
+ WorkerThread worker = (WorkerThread) this.threadPool.lease();
+ if (worker == null) {
+ worker = new WorkerThread(this.threadPool);
+ this.threadPool.add(worker);
+ worker.assignTask(task);
+ worker.start();
+ } else {
+ worker.assignTask(task);
+ }
+ }
+
+ public void shutdown() {
+ if (this.shutdown) {
+ return;
+ }
+ this.shutdown = true;
+ this.threadPool.interruptAll();
+ }
+
+
+ static class ThreadPool {
+
+ private final Set pool;
+ private final Set leased;
+ private final LinkedList available;
+
+ private volatile boolean shutdown;
+
+ public ThreadPool() {
+ super();
+ this.pool = new HashSet();
+ this.leased = new HashSet();
+ this.available = new LinkedList();
+ }
+
+ public void add(final Thread t) {
+ synchronized (this) {
+ this.pool.add(t);
+ this.leased.add(t);
+ }
+ }
+
+ public void remove(final Thread t) {
+ synchronized (this) {
+ if (this.pool.contains(t)) {
+ this.pool.remove(t);
+ this.leased.remove(t);
+ this.available.remove(t);
+ }
+ }
+ }
+
+ public Thread lease() {
+ if (this.shutdown) {
+ throw new IllegalArgumentException("Thread pool shut down");
+ }
+ synchronized (this) {
+ if (!this.available.isEmpty()) {
+ Thread t = (Thread) this.available.removeLast();
+ this.leased.add(t);
+ return t;
+ } else {
+ return null;
+ }
+ }
+ }
+
+ public void release(final Thread t) {
+ if (this.shutdown) {
+ throw new IllegalArgumentException("Thread pool shut down");
+ }
+ synchronized (this) {
+ if (this.leased.contains(t)) {
+ this.leased.remove(t);
+ this.available.addLast(t);
+ }
+ }
+ }
+
+ public void interruptAll() {
+ if (this.shutdown) {
+ return;
+ }
+ this.shutdown = true;
+ synchronized (this) {
+ this.available.clear();
+ this.leased.clear();
+ for (Iterator it = this.pool.iterator(); it.hasNext(); ) {
+ Thread t = (Thread) it.next();
+ t.interrupt();
+ }
+ this.pool.clear();
+ }
+ }
+
+ }
+
+ static class WorkerThread extends Thread {
+
+ private static int COUNT;
+
+ private final ThreadPool pool;
+ private final Object mutex;
+
+ private volatile Runnable task;
+ private volatile long deadline;
+
+ public WorkerThread(
+ final ThreadPool pool) {
+ super("worker-thread-" + (++COUNT));
+ this.pool = pool;
+ this.mutex = new Object();
+ }
+
+ public void assignTask(final Runnable task) {
+ if (task == null) {
+ return;
+ }
+ synchronized (this.mutex) {
+ if (this.task != null) {
+ throw new IllegalArgumentException("Task already assigned");
+ }
+ this.task = task;
+ this.deadline = System.currentTimeMillis() + MAX_WAIT_TIME;
+ this.mutex.notifyAll();
+ }
+ }
+
+ public void run() {
+ try {
+ synchronized (this.mutex) {
+ for (;;) {
+ if (this.task == null) {
+ this.mutex.wait(MAX_WAIT_TIME);
+ }
+ if (this.task == null && System.currentTimeMillis() > this.deadline) {
+ break;
+ }
+ if (this.task != null) {
+ this.task.run();
+ this.task = null;
+ this.pool.release(this);
+ }
+ }
+ }
+ } catch (InterruptedException ex) {
+ } finally {
+ System.err.println(this + ": terminate");
+ this.pool.remove(this);
+ }
+ }
+
+ }
+
+}
Propchange: jakarta/httpcomponents/httpcore/trunk/module-nio/src/test/java/org/apache/http/nio/mockup/SimpleThreadPoolExecutor.java
------------------------------------------------------------------------------
svn:eol-style = native
Propchange: jakarta/httpcomponents/httpcore/trunk/module-nio/src/test/java/org/apache/http/nio/mockup/SimpleThreadPoolExecutor.java
------------------------------------------------------------------------------
svn:keywords = Date Author Id Revision HeadURL
Propchange: jakarta/httpcomponents/httpcore/trunk/module-nio/src/test/java/org/apache/http/nio/mockup/SimpleThreadPoolExecutor.java
------------------------------------------------------------------------------
svn:mime-type = text/plain