| /* |
| * 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 |
| */ |
| |
| |
| public class RequestProcessor implements Runnable { |
| |
| private static Queue requestQueue; |
| private static Thread dispatcher; |
| |
| /** |
| * 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. |
| */ |
| 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 |
| */ |
| 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. |
| */ |
| private static synchronized void lazyInitialize() { |
| if (requestQueue == null) { |
| requestQueue = new Queue(); |
| } |
| } |
| |
| } |