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| 1 | /* | ||
| 2 | * Copyright (c) 1996, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.misc; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * The request processor allows functors (Request instances) to be created | ||
| 30 | * in arbitrary threads, and to be posted for execution in a non-restricted | ||
| 31 | * thread. | ||
| 32 | * | ||
| 33 | * @author Steven B. Byrne | ||
| 34 | */ | ||
| 35 | |||
| 36 | |||
| 37 | public class RequestProcessor implements Runnable { | ||
| 38 | |||
| 39 | private static Queue requestQueue; | ||
| 40 | private static Thread dispatcher; | ||
| 41 | |||
| 42 | /** | ||
| 43 | * Queues a Request instance for execution by the request procesor | ||
| 44 | * thread. | ||
| 45 | */ | ||
| 46 | public static void postRequest(Request req) { | ||
| 47 | lazyInitialize(); | ||
| 48 | requestQueue.enqueue(req); | ||
| 49 | } | ||
| 50 | |||
| 51 | /** | ||
| 52 | * Process requests as they are queued. | ||
| 53 | */ | ||
| 54 | public void run() { | ||
| 55 | lazyInitialize(); | ||
| 56 | while (true) { | ||
| 57 | try { | ||
| 58 | Object obj = requestQueue.dequeue(); | ||
| 59 | if (obj instanceof Request) { // ignore bogons | ||
| 60 | Request req = (Request)obj; | ||
| 61 | try { | ||
| 62 | req.execute(); | ||
| 63 | } catch (Throwable t) { | ||
| 64 | // do nothing at the moment...maybe report an error | ||
| 65 | // in the future | ||
| 66 | } | ||
| 67 | } | ||
| 68 | } catch (InterruptedException e) { | ||
| 69 | // do nothing at the present time. | ||
| 70 | } | ||
| 71 | } | ||
| 72 | } | ||
| 73 | |||
| 74 | |||
| 75 | /** | ||
| 76 | * This method initiates the request processor thread. It is safe | ||
| 77 | * to call it after the thread has been started. It provides a way for | ||
| 78 | * clients to deliberately control the context in which the request | ||
| 79 | * processor thread is created | ||
| 80 | */ | ||
| 81 | public static synchronized void startProcessing() { | ||
| 82 | if (dispatcher == null) { | ||
| 83 | dispatcher = new Thread(new RequestProcessor(), "Request Processor"); | ||
| 84 | dispatcher.setPriority(Thread.NORM_PRIORITY + 2); | ||
| 85 | dispatcher.start(); | ||
| 86 | } | ||
| 87 | } | ||
| 88 | |||
| 89 | |||
| 90 | /** | ||
| 91 | * This method performs lazy initialization. | ||
| 92 | */ | ||
| 93 | private static synchronized void lazyInitialize() { | ||
| 94 | if (requestQueue == null) { | ||
| 95 | requestQueue = new Queue(); | ||
| 96 | } | ||
| 97 | } | ||
| 98 | |||
| 99 | } | ||