org.mule.module.management.agent.YourKitProfilerAgent.java Source code

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Here is the source code for org.mule.module.management.agent.YourKitProfilerAgent.java

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/*
 * $Id$
 * --------------------------------------------------------------------------------------
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 *
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */

package org.mule.module.management.agent;

import org.mule.api.MuleContext;
import org.mule.api.MuleException;
import org.mule.api.agent.Agent;
import org.mule.api.context.MuleContextAware;
import org.mule.api.lifecycle.InitialisationException;
import org.mule.config.i18n.CoreMessages;
import org.mule.module.management.i18n.ManagementMessages;
import org.mule.module.management.mbean.YourKitProfilerService;
import org.mule.module.management.support.AutoDiscoveryJmxSupportFactory;
import org.mule.module.management.support.JmxSupport;
import org.mule.module.management.support.JmxSupportFactory;
import org.mule.util.ClassUtils;

import java.util.Collections;
import java.util.List;

import javax.management.InstanceNotFoundException;
import javax.management.MBeanRegistrationException;
import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class YourKitProfilerAgent implements Agent, MuleContextAware {
    /**
     * MBean name to register under.
     */
    public static final String PROFILER_OBJECT_NAME = "name=Profiler";

    private String name = "yourkit-profiler";
    private MBeanServer mBeanServer;
    private ObjectName profilerName;

    private JmxSupportFactory jmxSupportFactory = AutoDiscoveryJmxSupportFactory.getInstance();
    private JmxSupport jmxSupport = jmxSupportFactory.getJmxSupport();

    /**
     * Logger used by this class
     */
    protected static final Log logger = LogFactory.getLog(YourKitProfilerAgent.class);

    protected MuleContext muleContext;

    public void setMuleContext(MuleContext context) {
        muleContext = context;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDescription() {
        return "Profiler JMX Agent";
    }

    public List<Class<? extends Agent>> getDependentAgents() {
        return Collections.emptyList();
    }

    public void initialise() throws InitialisationException {
        if (!isApiAvailable()) {
            logger.warn("Cannot find YourKit API. Profiler JMX Agent will be unregistered.");
            unregisterMeQuietly();
            return;
        }

        final List servers = MBeanServerFactory.findMBeanServer(null);
        if (servers.isEmpty()) {
            throw new InitialisationException(ManagementMessages.noMBeanServerAvailable(), this);
        }

        try {
            mBeanServer = (MBeanServer) servers.get(0);

            profilerName = jmxSupport
                    .getObjectName(jmxSupport.getDomainName(muleContext) + ":" + PROFILER_OBJECT_NAME);

            // unregister existing YourKit MBean first if required
            unregisterMBeansIfNecessary();
            mBeanServer.registerMBean(new YourKitProfilerService(), profilerName);
        } catch (Exception e) {
            throw new InitialisationException(CoreMessages.failedToStart(this.getName()), e, this);
        }
    }

    /**
     * Unregister Profiler MBean if there are any left over the old deployment
     */
    protected void unregisterMBeansIfNecessary()
            throws MalformedObjectNameException, InstanceNotFoundException, MBeanRegistrationException {
        if (mBeanServer == null || profilerName == null) {
            return;
        }
        if (mBeanServer.isRegistered(profilerName)) {
            mBeanServer.unregisterMBean(profilerName);
        }
    }

    /**
     * Quietly unregister ourselves.
     */
    protected void unregisterMeQuietly() {
        try {
            // remove the agent from the list, it's not functional
            muleContext.getRegistry().unregisterAgent(this.getName());
        } catch (MuleException e) {
            // not interested, really
        }
    }

    private boolean isApiAvailable() {
        try {
            ClassUtils.getClass("com.yourkit.api.Controller");
            return true;
        } catch (ClassNotFoundException e) {
            return false;
        }
    }

    public void start() throws MuleException {
        // nothing to do
    }

    public void stop() throws MuleException {
        // nothing to do
    }

    public void dispose() {
        try {
            unregisterMBeansIfNecessary();
        } catch (Exception e) {
            logger.error("Couldn't unregister MBean: "
                    + (profilerName != null ? profilerName.getCanonicalName() : "null"), e);
        }
    }

}