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/*
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* Copyright (c) 1996, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.misc;
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/**
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* The request processor allows functors (Request instances) to be created
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* in arbitrary threads, and to be posted for execution in a non-restricted
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* thread.
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*
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* @author Steven B. Byrne
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*/
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public class RequestProcessor implements Runnable {
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private static Queue requestQueue;
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private static Thread dispatcher;
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/**
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* Queues a Request instance for execution by the request procesor
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* thread.
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*/
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public static void postRequest(Request req) {
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lazyInitialize();
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requestQueue.enqueue(req);
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}
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/**
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* Process requests as they are queued.
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*/
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public void run() {
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lazyInitialize();
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while (true) {
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try {
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Object obj = requestQueue.dequeue();
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if (obj instanceof Request) { // ignore bogons
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Request req = (Request)obj;
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try {
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req.execute();
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} catch (Throwable t) {
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// do nothing at the moment...maybe report an error
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// in the future
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}
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}
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} catch (InterruptedException e) {
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// do nothing at the present time.
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}
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}
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}
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/**
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* This method initiates the request processor thread. It is safe
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* to call it after the thread has been started. It provides a way for
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* clients to deliberately control the context in which the request
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* processor thread is created
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*/
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public static synchronized void startProcessing() {
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if (dispatcher == null) {
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dispatcher = new Thread(new RequestProcessor(), "Request Processor");
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dispatcher.setPriority(Thread.NORM_PRIORITY + 2);
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dispatcher.start();
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}
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}
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/**
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* This method performs lazy initialization.
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*/
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private static synchronized void lazyInitialize() {
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if (requestQueue == null) {
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requestQueue = new Queue();
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}
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}
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}
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