// ---------------------------------------------------------------------------
// jWebSocket - Monitor Stream
// Copyright (c) 2010 jWebSocket.org by Innotrade GmbH, Alexander Schulze.
// ---------------------------------------------------------------------------
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by the
// Free Software Foundation; either version 3 of the License, or (at your
// option) any later version.
// This program 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 Lesser General Public License for
// more details.
// You should have received a copy of the GNU Lesser General Public License along
// with this program; if not, see <http://www.gnu.org/licenses/lgpl.html>.
// ---------------------------------------------------------------------------
package org.jwebsocket.plugins.streaming;
import java.io.File;
import java.util.Date;
import org.apache.log4j.Logger;
import org.jwebsocket.logging.Logging;
import org.jwebsocket.server.TokenServer;
import org.jwebsocket.token.Token;
/**
* implements the jWebSocket monitor stream for demonstration purposes.
* Reads certain system parameters in a predefined interval of 1 second and
* reports it to all registered clients.
* @author aschulze
*/
public class MonitorStream extends TokenStream {
private static Logger log = Logging.getLogger(MonitorStream.class);
private Boolean isRunning = false;
private MonitorProcess monitorProcess = null;
private Thread monitorThread = null;
/**
* creates a new instance of the monitor stream.
* @param aStreamID The unique ID of the stream.
* @param aServer The Token Server associated with this stream.
*/
public MonitorStream(String aStreamID, TokenServer aServer) {
super(aStreamID, aServer);
startStream(-1);
}
/**
* starts the internal monitor thread to check for certain system
* parameters in a predefined interval of 1 second.
*/
@Override
public void startStream(long aTimeout) {
super.startStream(aTimeout);
if (log.isDebugEnabled()) {
log.debug("Starting Monitor stream...");
}
monitorProcess = new MonitorProcess();
monitorThread = new Thread(monitorProcess);
monitorThread.start();
}
/**
* stops the monitor thread.
*/
@Override
public void stopStream(long aTimeout) {
if (log.isDebugEnabled()) {
log.debug("Stopping Monitor stream...");
}
long lStarted = new Date().getTime();
isRunning = false;
try {
monitorThread.join(aTimeout);
} catch (Exception ex) {
log.error(ex.getClass().getSimpleName() + ": " + ex.getMessage());
}
if (log.isDebugEnabled()) {
long lDuration = new Date().getTime() - lStarted;
if (monitorThread.isAlive()) {
log.warn("Monitor stream did not stopped after " + lDuration + "ms.");
} else {
log.debug("Monitor stream stopped after " + lDuration + "ms.");
}
}
super.stopStream(aTimeout);
}
private class MonitorProcess implements Runnable {
@Override
public void run() {
if (log.isDebugEnabled()) {
log.debug("Running monitor stream...");
}
isRunning = true;
while (isRunning) {
try {
Thread.sleep(1000);
Token lToken = new Token("event");
lToken.put("name", "stream");
lToken.put("streamID", getStreamID());
// collect some data to monitor
Runtime lRT = Runtime.getRuntime();
lToken.put("totalMem", lRT.totalMemory());
lToken.put("freeMem", lRT.freeMemory());
TokenServer lServer = getServer();
lToken.put("clientCount", lServer.getAllConnectors().size());
File lFile = new File(".");
lToken.put("freeDisk", lFile.getFreeSpace());
lToken.put("totalDisk", lFile.getTotalSpace());
lToken.put("usableDisk", lFile.getUsableSpace());
// : further tags to be continued....
put(lToken);
} catch (InterruptedException ex) {
log.error("(run) " + ex.getClass().getSimpleName() + ": " + ex.getMessage());
}
}
if (log.isDebugEnabled()) {
log.debug("Monitor stream stopped.");
}
}
}
}