/*
* Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
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*/
package com.sun.jmx.remote.internal;
import com.sun.jmx.remote.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(null,
timeoutTask,
"JMX-Server-Admin-Timeout",
0,
false);
t.setName("JMX server connection timeout " + t.getId());
// 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.
Returns: the value of the termination flag:
true if the connection is already being terminated,
false otherwise.
/**
* Tells that a new request message is received.
* A caller of this method should always call the method
* <code>rspOutgoing</code> 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.
Returns: the value of the termination flag:
true if the connection is already being terminated,
false otherwise.
/**
* 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.
/**
* 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
/**
* 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");
}