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/*
 * @(#)ClusterListener.java	1.9 06/28/07
 */ 

package com.sun.messaging.jmq.jmsserver.cluster;

import com.sun.messaging.jmq.io.MQAddress;
import com.sun.messaging.jmq.util.UID;

/**
 * A listener on changes to ClusterManager.
 *
 * The listener has a method for cluster configuration changes and a seperate method
 * for cluster state changes.
 * <P>
 * 
 * @see ClusterManager
 */
public interface ClusterListener extends java.util.EventListener
{

   /**
    * Called to notify ClusterListeners when the cluster service
    * configuration. Configuration changes include:
    * <UL><LI>cluster service port</LI>
    *     <LI>cluster service hostname</LI>
    *     <LI>cluster service transport</LI>
    * </UL><P>
    *
    * @param name the name of the changed property
    * @param value the new value of the changed property
    */
    public void clusterPropertyChanged(String name, String value);


   /**
    * Called when a new broker has been added.
    * @param brokerSession uid associated with the added broker
    * @param broker the new broker added.
    */
    public void brokerAdded(ClusteredBroker broker, UID brokerSession);

   /**
    * Called when a broker has been removed.
    * @param brokerSession uid associated with the removed broker
    * @param broker the broker removed.
    */
    public void brokerRemoved(ClusteredBroker broker, UID brokerSession);

   /**
    * Called when the broker who is the master broker changes
    * (because of a reload properties).
    * @param oldMaster the previous master broker.
    * @param newMaster the new master broker.
    */
    public void masterBrokerChanged(ClusteredBroker oldMaster,
                    ClusteredBroker newMaster);

   /**
    * Called when the status of a broker has changed. The
    * status may not be accurate if a previous listener updated
    * the status for this specific broker.
    * @param brokerid the name of the broker updated.
    * @param oldStatus the previous status.
    * @param newStatus the new status.
    * @param brokerSession uid associated with the changed broker
    * @param userData data associated with the state change
    */
    public void brokerStatusChanged(String brokerid,
                  int oldStatus, int newStatus, UID uid, Object userData);

   /**
    * Called when the state of a broker has changed. The
    * state may not be accurate if a previous listener updated
    * the state for this specific broker.
    * @param brokerid the name of the broker updated.
    * @param oldState the previous state.
    * @param newState the new state.
    */
    public void brokerStateChanged(String brokerid,
                  BrokerState oldState, BrokerState newState);

   /**
    * Called when the version of a broker has changed. The
    * state may not be accurate if a previous listener updated
    * the version for this specific broker.
    * @param brokerid the name of the broker updated.
    * @param oldVersion the previous version.
    * @param newVersion the new version.
    */
    public void brokerVersionChanged(String brokerid,
                  int oldVersion, int newVersion);

   /**
    * Called when the url address of a broker has changed. The
    * address may not be accurate if a previous listener updated
    * the address for this specific broker.
    * @param brokerid the name of the broker updated.
    * @param newAddress the previous address.
    * @param oldAddress the new address.
    */
    public void brokerURLChanged(String brokerid,
                  MQAddress oldAddress, MQAddress newAddress);



} 

