org.glassfish.admin.mbeanserver.MBeanServerFactory Maven / Gradle / Ivy

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Support for instantiation of Glassfish MBeanServer
There is a newer version: 10.0-b28
/*
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 *
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 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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package org.glassfish.admin.mbeanserver;

import org.jvnet.hk2.annotations.FactoryFor;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.component.Factory;
import org.jvnet.hk2.component.ComponentException;

import javax.management.MBeanServer;

import org.glassfish.api.Startup;
import org.glassfish.api.Async;
import org.glassfish.internal.api.*;

/**
    Factory for the MBeanServer.  Required so that HK2 can find an MBeanServer
    for modules doing @Inject MBeanServer.
 */
@Service
@FactoryFor(MBeanServer.class)
public final class MBeanServerFactory implements Factory, PostStartup {
    private static void debug( final String s ) { System.out.println(s); }
    
    private final MBeanServer     mMBeanServer;
    
    public MBeanServerFactory()
    {
        // initialize eagerly; ~20ms
        mMBeanServer = java.lang.management.ManagementFactory.getPlatformMBeanServer();
    }
    
    public void postConstruct()
    {
    }
    
    /**
     * The system calls this method to obtain a reference
     * to the component.
     *
     * @return null is a valid return value. This is useful
     *         when a factory primarily does a look-up and it fails
     *         to find the specified component, yet you don't want that
     *         by itself to be an error. If the injection wants
     *         a non-null value (i.e., @Inject(optional=false)).
     * @throws org.jvnet.hk2.component.ComponentException
     *          If the factory failed to get/create an instance
     *          and would like to propagate the error to the caller.
     */
    public Object getObject() throws ComponentException {
        return mMBeanServer;
    }
    
}