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| 1 | +/* | |
| 2 | + * Copyright (c) 2003, 2004, 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.jmx.remote.internal; | |
| 27 | + | |
| 28 | +import java.io.IOException; | |
| 29 | + | |
| 30 | +import com.sun.jmx.remote.util.ClassLogger; | |
| 31 | + | |
| 32 | +public abstract class ServerCommunicatorAdmin { | |
| 33 | + public ServerCommunicatorAdmin(long timeout) { | |
| 34 | + if (logger.traceOn()) { | |
| 35 | + logger.trace("Constructor", | |
| 36 | + "Creates a new ServerCommunicatorAdmin object "+ | |
| 37 | + "with the timeout "+timeout); | |
| 38 | + } | |
| 39 | + | |
| 40 | + this.timeout = timeout; | |
| 41 | + | |
| 42 | + timestamp = 0; | |
| 43 | + if (timeout < Long.MAX_VALUE) { | |
| 44 | + Runnable timeoutTask = new Timeout(); | |
| 45 | + final Thread t = new Thread(timeoutTask); | |
| 46 | + t.setName("JMX server connection timeout " + t.getId()); | |
| 47 | + // If you change this name you will need to change a unit test | |
| 48 | + // (NoServerTimeoutTest) | |
| 49 | + t.setDaemon(true); | |
| 50 | + t.start(); | |
| 51 | + } | |
| 52 | + } | |
| 53 | + | |
| 54 | + /** | |
| 55 | + * Tells that a new request message is received. | |
| 56 | + * A caller of this method should always call the method | |
| 57 | + * <code>rspOutgoing</code> to inform that a response is sent out | |
| 58 | + * for the received request. | |
| 59 | + * @return the value of the termination flag: | |
| 60 | + * <ul><code>true</code> if the connection is already being terminated, | |
| 61 | + * <br><code>false</code> otherwise.</ul> | |
| 62 | + */ | |
| 63 | + public boolean reqIncoming() { | |
| 64 | + if (logger.traceOn()) { | |
| 65 | + logger.trace("reqIncoming", "Receive a new request."); | |
| 66 | + } | |
| 67 | + | |
| 68 | + synchronized(lock) { | |
| 69 | + if (terminated) { | |
| 70 | + logger.warning("reqIncoming", | |
| 71 | + "The server has decided to close " + | |
| 72 | + "this client connection."); | |
| 73 | + } | |
| 74 | + ++currentJobs; | |
| 75 | + | |
| 76 | + return terminated; | |
| 77 | + } | |
| 78 | + } | |
| 79 | + | |
| 80 | + /** | |
| 81 | + * Tells that a response is sent out for a received request. | |
| 82 | + * @return the value of the termination flag: | |
| 83 | + * <ul><code>true</code> if the connection is already being terminated, | |
| 84 | + * <br><code>false</code> otherwise.</ul> | |
| 85 | + */ | |
| 86 | + public boolean rspOutgoing() { | |
| 87 | + if (logger.traceOn()) { | |
| 88 | + logger.trace("reqIncoming", "Finish a request."); | |
| 89 | + } | |
| 90 | + | |
| 91 | + synchronized(lock) { | |
| 92 | + if (--currentJobs == 0) { | |
| 93 | + timestamp = System.currentTimeMillis(); | |
| 94 | + logtime("Admin: Timestamp=",timestamp); | |
| 95 | + // tells the adminor to restart waiting with timeout | |
| 96 | + lock.notify(); | |
| 97 | + } | |
| 98 | + return terminated; | |
| 99 | + } | |
| 100 | + } | |
| 101 | + | |
| 102 | + /** | |
| 103 | + * Called by this class to tell an implementation to do stop. | |
| 104 | + */ | |
| 105 | + protected abstract void doStop(); | |
| 106 | + | |
| 107 | + /** | |
| 108 | + * Terminates this object. | |
| 109 | + * Called only by outside, so do not need to call doStop | |
| 110 | + */ | |
| 111 | + public void terminate() { | |
| 112 | + if (logger.traceOn()) { | |
| 113 | + logger.trace("terminate", | |
| 114 | + "terminate the ServerCommunicatorAdmin object."); | |
| 115 | + } | |
| 116 | + | |
| 117 | + synchronized(lock) { | |
| 118 | + if (terminated) { | |
| 119 | + return; | |
| 120 | + } | |
| 121 | + | |
| 122 | + terminated = true; | |
| 123 | + | |
| 124 | + // tell Timeout to terminate | |
| 125 | + lock.notify(); | |
| 126 | + } | |
| 127 | + } | |
| 128 | + | |
| 129 | +// -------------------------------------------------------------- | |
| 130 | +// private classes | |
| 131 | +// -------------------------------------------------------------- | |
| 132 | + private class Timeout implements Runnable { | |
| 133 | + public void run() { | |
| 134 | + boolean stopping = false; | |
| 135 | + | |
| 136 | + synchronized(lock) { | |
| 137 | + if (timestamp == 0) timestamp = System.currentTimeMillis(); | |
| 138 | + logtime("Admin: timeout=",timeout); | |
| 139 | + logtime("Admin: Timestamp=",timestamp); | |
| 140 | + | |
| 141 | + while(!terminated) { | |
| 142 | + try { | |
| 143 | + // wait until there is no more job | |
| 144 | + while(!terminated && currentJobs != 0) { | |
| 145 | + if (logger.traceOn()) { | |
| 146 | + logger.trace("Timeout-run", | |
| 147 | + "Waiting without timeout."); | |
| 148 | + } | |
| 149 | + | |
| 150 | + lock.wait(); | |
| 151 | + } | |
| 152 | + | |
| 153 | + if (terminated) return; | |
| 154 | + | |
| 155 | + final long remaining = | |
| 156 | + timeout - (System.currentTimeMillis() - timestamp); | |
| 157 | + | |
| 158 | + logtime("Admin: remaining timeout=",remaining); | |
| 159 | + | |
| 160 | + if (remaining > 0) { | |
| 161 | + | |
| 162 | + if (logger.traceOn()) { | |
| 163 | + logger.trace("Timeout-run", | |
| 164 | + "Waiting with timeout: "+ | |
| 165 | + remaining + " ms remaining"); | |
| 166 | + } | |
| 167 | + | |
| 168 | + lock.wait(remaining); | |
| 169 | + } | |
| 170 | + | |
| 171 | + if (currentJobs > 0) continue; | |
| 172 | + | |
| 173 | + final long elapsed = | |
| 174 | + System.currentTimeMillis() - timestamp; | |
| 175 | + logtime("Admin: elapsed=",elapsed); | |
| 176 | + | |
| 177 | + if (!terminated && elapsed > timeout) { | |
| 178 | + if (logger.traceOn()) { | |
| 179 | + logger.trace("Timeout-run", | |
| 180 | + "timeout elapsed"); | |
| 181 | + } | |
| 182 | + logtime("Admin: timeout elapsed! "+ | |
| 183 | + elapsed+">",timeout); | |
| 184 | + // stopping | |
| 185 | + terminated = true; | |
| 186 | + | |
| 187 | + stopping = true; | |
| 188 | + break; | |
| 189 | + } | |
| 190 | + } catch (InterruptedException ire) { | |
| 191 | + logger.warning("Timeout-run","Unexpected Exception: "+ | |
| 192 | + ire); | |
| 193 | + logger.debug("Timeout-run",ire); | |
| 194 | + return; | |
| 195 | + } | |
| 196 | + } | |
| 197 | + } | |
| 198 | + | |
| 199 | + if (stopping) { | |
| 200 | + if (logger.traceOn()) { | |
| 201 | + logger.trace("Timeout-run", "Call the doStop."); | |
| 202 | + } | |
| 203 | + | |
| 204 | + doStop(); | |
| 205 | + } | |
| 206 | + } | |
| 207 | + } | |
| 208 | + | |
| 209 | + private void logtime(String desc,long time) { | |
| 210 | + timelogger.trace("synchro",desc+time); | |
| 211 | + } | |
| 212 | + | |
| 213 | +// -------------------------------------------------------------- | |
| 214 | +// private variables | |
| 215 | +// -------------------------------------------------------------- | |
| 216 | + private long timestamp; | |
| 217 | + | |
| 218 | + private final int[] lock = new int[0]; | |
| 219 | + private int currentJobs = 0; | |
| 220 | + | |
| 221 | + private long timeout; | |
| 222 | + | |
| 223 | + // state issue | |
| 224 | + private boolean terminated = false; | |
| 225 | + | |
| 226 | + private static final ClassLogger logger = | |
| 227 | + new ClassLogger("javax.management.remote.misc", | |
| 228 | + "ServerCommunicatorAdmin"); | |
| 229 | + private static final ClassLogger timelogger = | |
| 230 | + new ClassLogger("javax.management.remote.timeout", | |
| 231 | + "ServerCommunicatorAdmin"); | |
| 232 | +} | |