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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 | } | ||