com.englishtown.jmx.BeanManager Maven / Gradle / Ivy

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/*
 * The MIT License (MIT)
 * Copyright © 2013 Englishtown 
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the “Software”), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.englishtown.jmx;

import javax.management.*;
import java.lang.management.ManagementFactory;
import java.util.Hashtable;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 */
public enum BeanManager {
    INSTANCE;

    private static final String DOMAIN = "com.englishtown";
    private MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
    private ConcurrentHashMap registeredBeans = new ConcurrentHashMap<>();
    private boolean enabled;

    private BeanManager() {
        enabled = ("true".equals(System.getProperty("englishtown.jmx")));
    }

    public synchronized BeanContainer registerBean(final Object bean, final Hashtable keys) throws MalformedObjectNameException, NotCompliantMBeanException, MBeanRegistrationException, InstanceAlreadyExistsException {
        ObjectName objectName = new ObjectName(DOMAIN, keys);
        if (!mBeanServer.isRegistered(objectName)) {
            mBeanServer.registerMBean(bean, objectName);
        }

        BeanContainer beanContainer = new BeanContainer(bean, objectName);
        BeanContainer registeredBeanContainer = registeredBeans.putIfAbsent(objectName, beanContainer);

        return (registeredBeanContainer == null ? beanContainer : registeredBeanContainer);
    }

    public synchronized void unregisterBean(final ObjectName objectName) throws MBeanRegistrationException, InstanceNotFoundException {
        if (mBeanServer.isRegistered(objectName)) {
            mBeanServer.unregisterMBean(objectName);
        }

        registeredBeans.remove(objectName);
    }

    public void unregisterBean(final Hashtable keys) throws MalformedObjectNameException, InstanceNotFoundException, MBeanRegistrationException {
        ObjectName objectName = new ObjectName(DOMAIN, keys);
        this.unregisterBean(objectName);
    }

    public synchronized void unregisterAllBeans() throws MBeanRegistrationException, InstanceNotFoundException {
        Set objectNames = registeredBeans.keySet();

        for (ObjectName objectName : objectNames) {
            unregisterBean(objectName);
        }
    }

    public boolean isRegistered(final ObjectName objectName) {
        return mBeanServer.isRegistered(objectName);
    }

    public BeanContainer getBeanContainerForObjectName(final ObjectName objectName) {
        return registeredBeans.get(objectName);
    }

    public boolean isEnabled() {
        return enabled;
    }
}