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| 1 | /* | ||
| 2 | * Copyright (c) 1999, 2005, 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 com.sun.jndi.ldap; | ||
| 27 | |||
| 28 | import java.io.*; | ||
| 29 | import java.util.Vector; | ||
| 30 | import java.util.EventObject; | ||
| 31 | |||
| 32 | import javax.naming.event.NamingEvent; | ||
| 33 | import javax.naming.event.NamingExceptionEvent; | ||
| 34 | import javax.naming.event.NamingListener; | ||
| 35 | import javax.naming.ldap.UnsolicitedNotificationEvent; | ||
| 36 | import javax.naming.ldap.UnsolicitedNotificationListener; | ||
| 37 | |||
| 38 | /** | ||
| 39 | * Package private class used by EventSupport to dispatch events. | ||
| 40 | * This class implements an event queue, and a dispatcher thread that | ||
| 41 | * dequeues and dispatches events from the queue. | ||
| 42 | * | ||
| 43 | * Pieces stolen from sun.misc.Queue. | ||
| 44 | * | ||
| 45 | * @author Bill Shannon (from javax.mail.event) | ||
| 46 | * @author Rosanna Lee (modified for JNDI-related events) | ||
| 47 | */ | ||
| 48 | final class EventQueue implements Runnable { | ||
| 49 | final static private boolean debug = false; | ||
| 50 | |||
| 51 | private static class QueueElement { | ||
| 52 | QueueElement next = null; | ||
| 53 | QueueElement prev = null; | ||
| 54 | EventObject event = null; | ||
| 55 | Vector vector = null; | ||
| 56 | |||
| 57 | QueueElement(EventObject event, Vector vector) { | ||
| 58 | this.event = event; | ||
| 59 | this.vector = vector; | ||
| 60 | } | ||
| 61 | } | ||
| 62 | |||
| 63 | private QueueElement head = null; | ||
| 64 | private QueueElement tail = null; | ||
| 65 | private Thread qThread; | ||
| 66 | |||
| 67 | // package private | ||
| 68 | EventQueue() { | ||
| 69 | qThread = Obj.helper.createThread(this); | ||
| 70 | qThread.setDaemon(true); // not a user thread | ||
| 71 | qThread.start(); | ||
| 72 | } | ||
| 73 | |||
| 74 | // package private; | ||
| 75 | /** | ||
| 76 | * Enqueue an event. | ||
| 77 | * @param event Either a <tt>NamingExceptionEvent</tt> or a subclass | ||
| 78 | * of <tt>NamingEvent</tt> or | ||
| 79 | * <tt>UnsolicitedNotificatoniEvent</tt>. | ||
| 80 | * If it is a subclass of <tt>NamingEvent</tt>, all listeners must implement | ||
| 81 | * the corresponding subinterface of <tt>NamingListener</tt>. | ||
| 82 | * For example, for a <tt>ObjectAddedEvent</tt>, all listeners <em>must</em> | ||
| 83 | * implement the <tt>ObjectAddedListener</tt> interface. | ||
| 84 | * <em>The current implementation does not check this before dispatching | ||
| 85 | * the event.</em> | ||
| 86 | * If the event is a <tt>NamingExceptionEvent</tt>, then all listeners | ||
| 87 | * are notified. | ||
| 88 | * @param vector List of NamingListeners that will be notified of event. | ||
| 89 | */ | ||
| 90 | synchronized void enqueue(EventObject event, Vector vector) { | ||
| 91 | QueueElement newElt = new QueueElement(event, vector); | ||
| 92 | |||
| 93 | if (head == null) { | ||
| 94 | head = newElt; | ||
| 95 | tail = newElt; | ||
| 96 | } else { | ||
| 97 | newElt.next = head; | ||
| 98 | head.prev = newElt; | ||
| 99 | head = newElt; | ||
| 100 | } | ||
| 101 | notify(); | ||
| 102 | } | ||
| 103 | |||
| 104 | /** | ||
| 105 | * Dequeue the oldest object on the queue. | ||
| 106 | * Used only by the run() method. | ||
| 107 | * | ||
| 108 | * @return the oldest object on the queue. | ||
| 109 | * @exception java.lang.InterruptedException if any thread has | ||
| 110 | * interrupted this thread. | ||
| 111 | */ | ||
| 112 | private synchronized QueueElement dequeue() | ||
| 113 | throws InterruptedException { | ||
| 114 | while (tail == null) | ||
| 115 | wait(); | ||
| 116 | QueueElement elt = tail; | ||
| 117 | tail = elt.prev; | ||
| 118 | if (tail == null) { | ||
| 119 | head = null; | ||
| 120 | } else { | ||
| 121 | tail.next = null; | ||
| 122 | } | ||
| 123 | elt.prev = elt.next = null; | ||
| 124 | return elt; | ||
| 125 | } | ||
| 126 | |||
| 127 | /** | ||
| 128 | * Pull events off the queue and dispatch them. | ||
| 129 | */ | ||
| 130 | public void run() { | ||
| 131 | QueueElement qe; | ||
| 132 | |||
| 133 | try { | ||
| 134 | while ((qe = dequeue()) != null) { | ||
| 135 | EventObject e = qe.event; | ||
| 136 | Vector v = qe.vector; | ||
| 137 | |||
| 138 | for (int i = 0; i < v.size(); i++) { | ||
| 139 | |||
| 140 | // Dispatch to corresponding NamingListener | ||
| 141 | // The listener should only be getting the event that | ||
| 142 | // it is interested in. (No need to check mask or | ||
| 143 | // instanceof subinterfaces.) | ||
| 144 | // It is the responsibility of the enqueuer to | ||
| 145 | // only enqueue events with listseners of the correct type. | ||
| 146 | |||
| 147 | if (e instanceof NamingEvent) { | ||
| 148 | ((NamingEvent)e).dispatch((NamingListener)v.elementAt(i)); | ||
| 149 | |||
| 150 | // An exception occurred: if notify all naming listeners | ||
| 151 | } else if (e instanceof NamingExceptionEvent) { | ||
| 152 | ((NamingExceptionEvent)e).dispatch( | ||
| 153 | (NamingListener)v.elementAt(i)); | ||
| 154 | } else if (e instanceof UnsolicitedNotificationEvent) { | ||
| 155 | ((UnsolicitedNotificationEvent)e).dispatch( | ||
| 156 | (UnsolicitedNotificationListener)v.elementAt(i)); | ||
| 157 | } | ||
| 158 | } | ||
| 159 | |||
| 160 | qe = null; e = null; v = null; | ||
| 161 | } | ||
| 162 | } catch (InterruptedException e) { | ||
| 163 | // just die | ||
| 164 | } | ||
| 165 | } | ||
| 166 | |||
| 167 | // package private; used by EventSupport; | ||
| 168 | /** | ||
| 169 | * Stop the dispatcher so we can be destroyed. | ||
| 170 | */ | ||
| 171 | void stop() { | ||
| 172 | if (debug) System.err.println("EventQueue stopping"); | ||
| 173 | if (qThread != null) { | ||
| 174 | qThread.interrupt(); // kill our thread | ||
| 175 | qThread = null; | ||
| 176 | } | ||
| 177 | } | ||
| 178 | } | ||