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/*
* @(#)ServerCommunicatorAdmin.java 1.3
*
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
*
* The contents of this file are subject to the terms of either the GNU General
* Public License Version 2 only ("GPL") or the Common Development and
* Distribution License("CDDL")(collectively, the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy of the
* License at http://opendmk.dev.java.net/legal_notices/licenses.txt or in the
* LEGAL_NOTICES folder that accompanied this code. See the License for the
* specific language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file found at
* http://opendmk.dev.java.net/legal_notices/licenses.txt
* or in the LEGAL_NOTICES folder that accompanied this code.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code.
*
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
*
* "Portions Copyrighted [year] [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding
*
* "[Contributor] elects to include this software in this distribution
* under the [CDDL or GPL Version 2] license."
*
* If you don't indicate a single choice of license, a recipient has the option
* to distribute your version of this file under either the CDDL or the GPL
* Version 2, or to extend the choice of license to its licensees as provided
* above. However, if you add GPL Version 2 code and therefore, elected the
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* subject to such option by the copyright holder.
*
*/
package com.sun.jmx.remote.opt.internal;
import java.io.IOException;
import com.sun.jmx.remote.opt.util.ClassLogger;
public abstract class ServerCommunicatorAdmin {
public ServerCommunicatorAdmin(long timeout) {
if (logger.traceOn()) {
logger.trace("Constructor",
"Creates a new ServerCommunicatorAdmin object "+
"with the timeout "+timeout);
}
this.timeout = timeout;
timestamp = 0;
if (timeout < Long.MAX_VALUE) {
Runnable timeoutTask = new Timeout();
final Thread t = new Thread(timeoutTask);
t.setName("JMX server connection timeout " + t.getName());
// If you change this name you will need to change a unit test
// (NoServerTimeoutTest)
t.setDaemon(true);
t.start();
}
}
/**
* Tells that a new request message is received.
* A caller of this method should always call the method
* rspOutgoing to inform that a response is sent out
* for the received request.
* @return the value of the termination flag:
*
true if the connection is already being terminated,
* false otherwise.
*/
public boolean reqIncoming() {
if (logger.traceOn()) {
logger.trace("reqIncoming", "Receive a new request.");
}
synchronized(lock) {
if (terminated) {
logger.warning("reqIncoming",
"The server has decided to close " +
"this client connection.");
}
++currentJobs;
return terminated;
}
}
/**
* Tells that a response is sent out for a received request.
* @return the value of the termination flag:
*
true if the connection is already being terminated,
* false otherwise.
*/
public boolean rspOutgoing() {
if (logger.traceOn()) {
logger.trace("reqIncoming", "Finish a request.");
}
synchronized(lock) {
if (--currentJobs == 0) {
timestamp = System.currentTimeMillis();
logtime("Admin: Timestamp=",timestamp);
// tells the adminor to restart waiting with timeout
lock.notify();
}
return terminated;
}
}
/**
* Called by this class to tell an implementation to do stop.
*/
protected abstract void doStop();
/**
* Terminates this object.
* Called only by outside, so do not need to call doStop
*/
public void terminate() {
if (logger.traceOn()) {
logger.trace("terminate",
"terminate the ServerCommunicatorAdmin object.");
}
synchronized(lock) {
if (terminated) {
return;
}
terminated = true;
// tell Timeout to terminate
lock.notify();
}
}
// --------------------------------------------------------------
// private classes
// --------------------------------------------------------------
private class Timeout implements Runnable {
public void run() {
boolean stopping = false;
synchronized(lock) {
if (timestamp == 0) timestamp = System.currentTimeMillis();
logtime("Admin: timeout=",timeout);
logtime("Admin: Timestamp=",timestamp);
while(!terminated) {
try {
// wait until there is no more job
while(!terminated && currentJobs != 0) {
if (logger.traceOn()) {
logger.trace("Timeout-run",
"Waiting without timeout.");
}
lock.wait();
}
if (terminated) return;
final long remaining =
timeout - (System.currentTimeMillis() - timestamp);
logtime("Admin: remaining timeout=",remaining);
if (remaining > 0) {
if (logger.traceOn()) {
logger.trace("Timeout-run",
"Waiting with timeout: "+
remaining + " ms remaining");
}
lock.wait(remaining);
}
if (currentJobs > 0) continue;
final long elapsed =
System.currentTimeMillis() - timestamp;
logtime("Admin: elapsed=",elapsed);
if (!terminated && elapsed > timeout) {
if (logger.traceOn()) {
logger.trace("Timeout-run",
"timeout elapsed");
}
logtime("Admin: timeout elapsed! "+
elapsed+">",timeout);
// stopping
terminated = true;
stopping = true;
break;
}
} catch (InterruptedException ire) {
logger.warning("Timeout-run","Unexpected Exception: "+
ire);
logger.debug("Timeout-run",ire);
return;
}
}
}
if (stopping) {
if (logger.traceOn()) {
logger.trace("Timeout-run", "Call the doStop.");
}
doStop();
}
}
}
private void logtime(String desc,long time) {
timelogger.trace("synchro",desc+time);
}
// --------------------------------------------------------------
// private variables
// --------------------------------------------------------------
private long timestamp;
private final int[] lock = new int[0];
private int currentJobs = 0;
private long timeout;
// state issue
private boolean terminated = false;
private static final ClassLogger logger =
new ClassLogger("javax.management.remote.misc",
"ServerCommunicatorAdmin");
private static final ClassLogger timelogger =
new ClassLogger("javax.management.remote.timeout",
"ServerCommunicatorAdmin");
}