/*
 * Copyright (c) 1996, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.misc;

The request processor allows functors (Request instances) to be created in arbitrary threads, and to be posted for execution in a non-restricted thread.
Author: Steven B. Byrne
/** * The request processor allows functors (Request instances) to be created * in arbitrary threads, and to be posted for execution in a non-restricted * thread. * * @author Steven B. Byrne */
public class RequestProcessor implements Runnable { private static Queue requestQueue; private static Thread dispatcher;
Queues a Request instance for execution by the request procesor thread.
/** * Queues a Request instance for execution by the request procesor * thread. */
public static void postRequest(Request req) { lazyInitialize(); requestQueue.enqueue(req); }
Process requests as they are queued.
/** * Process requests as they are queued. */
public void run() { lazyInitialize(); while (true) { try { Object obj = requestQueue.dequeue(); if (obj instanceof Request) { // ignore bogons Request req = (Request)obj; try { req.execute(); } catch (Throwable t) { // do nothing at the moment...maybe report an error // in the future } } } catch (InterruptedException e) { // do nothing at the present time. } } }
This method initiates the request processor thread. It is safe to call it after the thread has been started. It provides a way for clients to deliberately control the context in which the request processor thread is created
/** * This method initiates the request processor thread. It is safe * to call it after the thread has been started. It provides a way for * clients to deliberately control the context in which the request * processor thread is created */
public static synchronized void startProcessing() { if (dispatcher == null) { dispatcher = new Thread(new RequestProcessor(), "Request Processor"); dispatcher.setPriority(Thread.NORM_PRIORITY + 2); dispatcher.start(); } }
This method performs lazy initialization.
/** * This method performs lazy initialization. */
private static synchronized void lazyInitialize() { if (requestQueue == null) { requestQueue = new Queue(); } } }