com.ebay.erl.mobius.util.JVMShutdownNotifier.java Source code

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Here is the source code for com.ebay.erl.mobius.util.JVMShutdownNotifier.java

Source

package com.ebay.erl.mobius.util;

import java.util.Observable;

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

/**
 * Observing JVM shutdown signal and notify
 * objects that register to this when a shutdown
 * signal happened.
 * 
 * <p>
 * This product is licensed under the Apache License,  Version 2.0, 
 * available at http://www.apache.org/licenses/LICENSE-2.0.
 * 
 * This product contains portions derived from Apache hadoop which is 
 * licensed under the Apache License, Version 2.0, available at 
 * http://hadoop.apache.org.
 * 
 *  2007  2012 eBay Inc., Evan Chiu, Woody Zhou, Neel Sundaresan
 *
 */
public class JVMShutdownNotifier extends Observable implements Runnable {
    private static final JVMShutdownNotifier _INSTANCE = new JVMShutdownNotifier();

    private static final Log LOGGER = LogFactory.getLog(JVMShutdownNotifier.class);

    private JVMShutdownNotifier() {
        ///////////////////////////////////
        // setup JVM termination Hookup
        ///////////////////////////////////
        Runtime.getRuntime().addShutdownHook(new Thread(this));
    }

    public static JVMShutdownNotifier getInstance() {
        return JVMShutdownNotifier._INSTANCE;
    }

    @Override
    public void run() {
        // JVM shutdown detected, notify objects
        LOGGER.info("JVM shutdown signal detected");
        this.setChanged();
        this.notifyObservers();
    }
}