ActiveMQ example source code file (AbstractPerformanceSampler.java)

This example ActiveMQ source code file (AbstractPerformanceSampler.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

abstractobjectproperties, abstractperformancesampler, atomicboolean, atomicboolean, interruptedexception, interruptedexception, performanceeventlistener, performancereportwriter, performancereportwriter, performancesampler, thread, thread

The ActiveMQ AbstractPerformanceSampler.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.sampler;

import java.util.concurrent.atomic.AtomicBoolean;

import org.apache.activemq.tool.properties.AbstractObjectProperties;
import org.apache.activemq.tool.reports.PerformanceReportWriter;

public abstract class AbstractPerformanceSampler extends AbstractObjectProperties implements PerformanceSampler {
    
    protected long rampUpTime = 30 * 1000; // 30 secs
    protected long rampDownTime = 30 * 1000; // 30 secs
    protected long duration = 5 * 60 * 1000; // 5 mins
    protected long interval = 1000; // 1 sec
    protected PerformanceReportWriter perfReportWriter;
    protected PerformanceEventListener perfEventListener;
    protected final AtomicBoolean isRunning = new AtomicBoolean(false);
    protected long sampleIndex;

    public long getRampUpTime() {
        return rampUpTime;
    }

    public void setRampUpTime(long rampUpTime) {
        this.rampUpTime = rampUpTime;
    }

    public long getRampDownTime() {
        return rampDownTime;
    }

    public void setRampDownTime(long rampDownTime) {
        this.rampDownTime = rampDownTime;
    }

    public long getDuration() {
        return duration;
    }

    public void setDuration(long duration) {
        this.duration = duration;
    }

    public long getInterval() {
        return interval;
    }

    public void setInterval(long interval) {
        this.interval = interval;
    }

    public PerformanceReportWriter getPerfReportWriter() {
        return perfReportWriter;
    }

    public void setPerfReportWriter(PerformanceReportWriter perfReportWriter) {
        this.perfReportWriter = perfReportWriter;
    }

    public PerformanceEventListener getPerfEventListener() {
        return perfEventListener;
    }

    public void setPerfEventListener(PerformanceEventListener perfEventListener) {
        this.perfEventListener = perfEventListener;
    }

    public void startSampler() {
        isRunning.set(true);
        Thread t = new Thread(this);
        t.start();
    }

    public void run() {
        try {
            onRampUpStart();
            if (perfEventListener != null) {
                perfEventListener.onRampUpStart(this);
            }

            try {
                Thread.sleep(rampUpTime);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            onSamplerStart();
            if (perfEventListener != null) {
                perfEventListener.onSamplerStart(this);
            }

            sample();

            onSamplerEnd();
            if (perfEventListener != null) {
                perfEventListener.onSamplerEnd(this);
            }

            try {
                Thread.sleep(rampDownTime);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            onRampDownEnd();
            if (perfEventListener != null) {
                perfEventListener.onRampDownEnd(this);
            }
        } finally {
            isRunning.set(false);
            synchronized (isRunning) {
                isRunning.notifyAll();
            }
        }
    }

    protected void sample() {
        // Compute for the actual duration window of the sampler
        long endTime = System.currentTimeMillis() + duration - rampDownTime - rampUpTime;

        while (System.currentTimeMillis() < endTime) {
            try {
                Thread.sleep(interval);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            sampleData();
            sampleIndex++;
        }
    }

    public abstract void sampleData();

    public boolean isRunning() {
        return isRunning.get();
    }

    public void waitUntilDone() {
        while (isRunning()) {
            try {
                synchronized (isRunning) {
                    isRunning.wait(0);
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    // Call back functions to customize behavior of thread.
    protected void onRampUpStart() {
    }

    protected void onSamplerStart() {
    }

    protected void onSamplerEnd() {
    }

    protected void onRampDownEnd() {
    }
}