/**
* Helios, OpenSource Monitoring
* Brought to you by the Helios Development Group
*
* Copyright 2007, Helios Development Group and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This 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 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*
*/
package org.helios.netty.ajax;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;
import java.util.concurrent.TimeUnit;
import org.json.JSONObject;
/**
* <p>Title: MemoryReporter</p>
* <p>Description: Wakes up every <i>n</i> seconds and broadcasts the heap usage to all channels in the shared channel group</p>
* <p>Company: Helios Development Group LLC</p>
* @author Whitehead (nwhitehead AT heliosdev DOT org)
* <p><code>org.helios.netty.ajax.MemoryReporter</code></p>
*/
public class MemoryReporter extends Thread {
/** The memory mx bean */
public static final MemoryMXBean mxBean = ManagementFactory.getMemoryMXBean();
/** The number of ms. to sleep */
private final long sleepTime;
/**
* Creates a new MemoryReporter
* @param frequency The frequency in seconds of the memory reporting
*/
public MemoryReporter(int frequency) {
super("MemoryReporter-" + frequency);
setDaemon(true);
sleepTime = TimeUnit.MILLISECONDS.convert(frequency, TimeUnit.SECONDS);
}
/**
* Broadcasts the heap memory usage every <code>sleepTime</code> ms.
* {@inheritDoc}
* @see java.lang.Thread#run()
*/
public void run() {
while(true) {
try { join(sleepTime); } catch (Exception e) {}
MemoryUsage musage = mxBean.getHeapMemoryUsage();
SharedChannelGroup.getInstance().write(new JSONObject(musage));
}
}
}