ActiveMQ example source code file (CpuSamplerTask.java)

This example ActiveMQ source code file (CpuSamplerTask.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

abstractperformancesampler, cpu, cpu, cpusamplertask, found, io, ioexception, ioexception, linuxcpusamplerplugin, no, no, os, plugin, sampler, sampler

The ActiveMQ CpuSamplerTask.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.io.IOException;

import org.apache.activemq.tool.reports.AbstractPerfReportWriter;
import org.apache.activemq.tool.sampler.plugins.CpuSamplerPlugin;
import org.apache.activemq.tool.sampler.plugins.LinuxCpuSamplerPlugin;

public class CpuSamplerTask extends AbstractPerformanceSampler {

    private CpuSamplerPlugin plugin;

    public void createPlugin() throws IOException {
        createPlugin(System.getProperty("os.name"));
    }

    public void createPlugin(String osName) throws IOException {
        if (osName == null) {
            throw new IOException("No defined OS name found. Found: " + osName);
        }

        if (osName.equalsIgnoreCase(CpuSamplerPlugin.LINUX)) {
            plugin = new LinuxCpuSamplerPlugin(getInterval());
        } else {
            throw new IOException("No CPU Sampler Plugin found for OS: " + osName + ". CPU Sampler will not be started.");
        }
    }

    public void sampleData() {
        if (plugin != null && perfReportWriter != null) {
            perfReportWriter.writeCsvData(AbstractPerfReportWriter.REPORT_PLUGIN_CPU, "index=" + sampleIndex + "," + plugin.getCpuUtilizationStats());
        }
    }

    protected void onRampUpStart() {
        super.onRampUpStart();
        if (plugin != null) {
            plugin.start();
        }
    }

    protected void onRampDownEnd() {
        super.onRampDownEnd();
        if (plugin != null) {
            plugin.stop();
        }
    }
}