com.heliosapm.opentsdb.server.MemoryReporter.java Source code

Introduction

Here is the source code for com.heliosapm.opentsdb.server.MemoryReporter.java

Source

/*
* Copyright 2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.heliosapm.opentsdb.server;

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>com.heliosapm.opentsdb.server.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));
        }
    }
}