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ActiveMQ example source code file (MemoryMonitoringTool.java)

This example ActiveMQ source code file (MemoryMonitoringTool.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

atomicboolean, atomicboolean, dataoutputstream, exception, io, management, memory, memorymonitoringtool, memorymxbean, properties, properties, reportgenerator, reportgenerator, string, thread, thread, util

The ActiveMQ MemoryMonitoringTool.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.activemq.tool;

import java.io.DataOutputStream;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.util.Properties;
import java.util.concurrent.atomic.AtomicBoolean;

public class MemoryMonitoringTool implements Runnable {

    protected Properties testSettings = new Properties();
    protected ReportGenerator reportGenerator = new ReportGenerator();

    private long checkpointInterval = 5000;          // 5 sec sample checkpointInterval
    private long resultIndex;
    private AtomicBoolean isRunning = new AtomicBoolean(false);
    private DataOutputStream dataDoutputStream;
    private MemoryMXBean memoryBean;

    public Properties getTestSettings() {
        return testSettings;
    }

    public void setTestSettings(Properties sysTestSettings) {
        this.testSettings = sysTestSettings;
    }

    public DataOutputStream getDataOutputStream() {
        return dataDoutputStream;
    }

    public void setDataOutputStream(DataOutputStream dataDoutputStream) {
        this.dataDoutputStream = dataDoutputStream;
    }


    public void stopMonitor() {
        isRunning.set(false);
    }


    public long getCheckpointInterval() {
        return checkpointInterval;
    }

    public void setCheckpointInterval(long checkpointInterval) {
        this.checkpointInterval = checkpointInterval;
    }


    public Thread startMonitor() {

        String intervalStr = this.getTestSettings().getProperty("checkpoint_interval");
        checkpointInterval = new Integer(intervalStr).intValue();
        this.getTestSettings().remove("checkpoint_interval");

        memoryBean = ManagementFactory.getMemoryMXBean();
        reportGenerator.setTestSettings(getTestSettings());
        addTestInformation();

        Thread t = new Thread(this);
        t.setName("Memory monitoring tool");
        isRunning.set(true);
        t.start();

        return t;

    }


    public void addTestInformation() {
        reportGenerator.setReportName(this.getTestSettings().getProperty("report_name"));
        reportGenerator.setReportDirectory(this.getTestSettings().getProperty("report_directory"));
        reportGenerator.startGenerateReport();

        reportGenerator.addTestInformation();
        reportGenerator.writeWithIndent(4, "<jvm_memory_settings>");
        reportGenerator.writeWithIndent(6, "<heap_memory>");
        reportGenerator.writeWithIndent(8, "<committed>" + memoryBean.getHeapMemoryUsage().getCommitted() + "");
        reportGenerator.writeWithIndent(8, "<max>" + memoryBean.getHeapMemoryUsage().getMax() + "");
        reportGenerator.writeWithIndent(6, "</heap_memory>");
        reportGenerator.writeWithIndent(6, "<non_heap_memory>");
        reportGenerator.writeWithIndent(8, "<committed>" + memoryBean.getNonHeapMemoryUsage().getCommitted() + "");
        reportGenerator.writeWithIndent(8, "<max>" + memoryBean.getNonHeapMemoryUsage().getMax() + "");
        reportGenerator.writeWithIndent(6, "</non_heap_memory>");
        reportGenerator.writeWithIndent(4, "</jvm_memory_settings>");

        reportGenerator.addClientSettings();
        reportGenerator.endTestInformation();
    }


    public void run() {

        long nonHeapMB = 0;
        long heapMB = 0;
        long oneMB = 1024 * 1024;

        reportGenerator.startTestResult(getCheckpointInterval());
        while (isRunning.get()) {

            try {
                //wait every check point before getting the next memory usage
                Thread.sleep(checkpointInterval);

                nonHeapMB = memoryBean.getNonHeapMemoryUsage().getUsed() / oneMB;
                heapMB = memoryBean.getHeapMemoryUsage().getUsed() / oneMB;

                reportGenerator.writeWithIndent(6, "<memory_usage index='" + resultIndex
                                                + "' non_heap_mb='" + nonHeapMB
                                                + "' non_heap_bytes='"
                                                + memoryBean.getNonHeapMemoryUsage().getUsed()
                                                + "' heap_mb='" + heapMB
                                                + "' heap_bytes='" + memoryBean.getHeapMemoryUsage().getUsed() + "'/>");

                resultIndex++;

            } catch (Exception e) {
                e.printStackTrace();

            }


        }
        reportGenerator.endTestResult();
        reportGenerator.stopGenerateReport();

    }


}

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