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package com.sun.enterprise.connectors.naming;

import com.sun.appserv.connectors.internal.spi.ConnectorNamingEventListener;
import com.sun.appserv.connectors.internal.spi.ConnectorNamingEvent;

import java.util.ArrayList;

/**
 * Notifier for connector resource naming events
 * @author Jagadish Ramu
 */
public class ConnectorResourceNamingEventNotifier implements ConnectorNamingEventNotifier{

     private ArrayList listeners;
     private static ConnectorResourceNamingEventNotifier notifier;

     private ConnectorResourceNamingEventNotifier(){
        listeners= new ArrayList();
     }

      /**
       * Returns an instance of event notifier (singleton)
       * @return  ConnectorNamingEventNotifier
       */
     public static synchronized ConnectorNamingEventNotifier getInstance(){
         if(notifier == null){
            notifier = new ConnectorResourceNamingEventNotifier();
         }
        return notifier;
     }

    /**
     * To add Listener which gets notified when the event happens
     * @param listener
     */
    public void addListener(ConnectorNamingEventListener listener){
        listeners.add(listener);
    }

    /**
     * To remove listener such that it wont be notified anymore.
     * @param listener
     */
    public void removeListener(ConnectorNamingEventListener listener){
        listeners.remove(listener);
    }

    /**
     * Notifies all the registered listeners about the naming event.
     * @param event
     */
    public void notifyListeners(ConnectorNamingEvent event){

        for(ConnectorNamingEventListener listener : listeners){
            listener.connectorNamingEventPerformed(event);
        }
    }
}