com.googlecode.arit.mbeans.MBeanScanner.java Source code

Introduction

Here is the source code for com.googlecode.arit.mbeans.MBeanScanner.java

Source

/*
 * Copyright 2010-2011 Andreas Veithen
 *
 * 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.googlecode.arit.mbeans;

import java.util.ArrayList;
import java.util.Set;

import javax.management.JMException;
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;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;

import com.googlecode.arit.Messages;
import com.googlecode.arit.resource.CleanerPlugin;
import com.googlecode.arit.resource.ResourceScanner;
import com.googlecode.arit.resource.ResourceType;
import com.googlecode.arit.resource.SimpleResource;

public class MBeanScanner implements ResourceScanner, CleanerPlugin {

    private static final Log LOG = LogFactory.getLog(MBeanScanner.class);

    @Autowired
    @Qualifier("mbean")
    private ResourceType resourceType;

    @Autowired
    private MBeanServerInspector mbsInspector;

    @Autowired(required = false)
    private Messages messages;

    public boolean isAvailable() {
        return mbsInspector.isAvailable();
    }

    public String getDescription() {
        return "MBeans";
    }

    public void scanForResources(ResourceListener resourceEventListener) {
        ArrayList<MBeanServer> mbeanServers = MBeanServerFactory.findMBeanServer(null);
        for (MBeanServer mbs : mbeanServers) {
            MBeanAccessor mbeanAccessor = mbsInspector.inspect(mbs);
            if (mbeanAccessor == null) {
                String errorMsg = "Unable to inspect MBeanServer of type " + mbs.getClass().getName();
                LOG.error(errorMsg);
                if (messages != null) {
                    messages.addMessage(errorMsg);
                }
            } else {
                Set<ObjectName> mbeans;
                try {
                    mbeans = mbs.queryNames(new ObjectName("*:*"), null);
                } catch (MalformedObjectNameException ex) {
                    // We should never get here
                    throw new Error(ex);
                }

                for (ObjectName name : mbeans) {
                    Object mbean = mbeanAccessor.retrieve(name);
                    SimpleResource<Object> mbeanResource = new SimpleResource<Object>(resourceType, mbean,
                            "MBean: " + name);
                    mbeanResource.addClassloaderReference(mbean.getClass().getClassLoader(),
                            "Implementation class: " + mbean.getClass().getName());
                    resourceEventListener.onResourceFound(mbeanResource);
                }
            }
        }
    }

    public void clean(ClassLoader classLoader) {
        ArrayList<MBeanServer> mbeanServers = MBeanServerFactory.findMBeanServer(null);
        for (MBeanServer mbs : mbeanServers) {
            MBeanAccessor mbeanAccessor = mbsInspector.inspect(mbs);
            if (mbeanAccessor == null) {
                String errorMsg = "Unable to inspect MBeanServer of type " + mbs.getClass().getName();
                LOG.error(errorMsg);
                if (messages != null) {
                    messages.addMessage(errorMsg);
                }
            } else {
                Set<ObjectName> mbeans;
                try {
                    mbeans = mbs.queryNames(new ObjectName("*:*"), null);
                } catch (MalformedObjectNameException ex) {
                    // We should never get here
                    throw new Error(ex);
                }

                for (ObjectName name : mbeans) {
                    Object mbean = mbeanAccessor.retrieve(name);
                    if (mbean.getClass().getClassLoader().equals(classLoader)) {
                        try {
                            mbs.unregisterMBean(name);
                        } catch (JMException ex) {
                            String errorMsg = "Error during cleanup of mbean - unregistration of mbean "
                                    + name.toString() + " failed";
                            LOG.error(errorMsg, ex);
                            if (messages != null) {
                                messages.addMessage(errorMsg);
                            }
                        }
                    }
                }
            }
        }
    }
}