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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 | +} | |