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package com.sun.enterprise.naming.impl;

import java.util.List;

import com.sun.corba.ee.spi.folb.GroupInfoServiceObserver;
import com.sun.corba.ee.spi.folb.GroupInfoService;
import com.sun.corba.ee.spi.folb.ClusterInstanceInfo;

import java.util.logging.Logger;
import java.util.logging.Level;
import com.sun.logging.LogDomains;


/**
 * Called when the GroupInfoService that you register with
 * has a change.  You should call the GroupInfoService
 * getClusterInstanceInfo method to get
 * updated info.
 * @author Ken Cavanaugh
 * @author Sheetal Vartak
 */
public class GroupInfoServiceObserverImpl 
    implements GroupInfoServiceObserver {

    protected static final Logger _logger = LogDomains.getLogger(
        GroupInfoServiceObserverImpl.class, LogDomains.JNDI_LOGGER);

    private static void doLog( Level level, String fmt, Object... args )  {
        if (_logger.isLoggable(level)) {
            _logger.log( level, fmt, args ) ;
        }
    }

    private static void fineLog( String fmt, Object... args ) {
        doLog( Level.FINE, fmt, args ) ;
    }


    private GroupInfoService gis;
    private RoundRobinPolicy rr ;

    public GroupInfoServiceObserverImpl(GroupInfoService gis, 
        RoundRobinPolicy rr ) {

	this.gis = gis;
        this.rr = rr ;
    }

    // This method is called for internally forced updates: 
    // see SerialInitContextFactory.getInitialContext.
    public void forceMembershipChange() {
        fineLog( "GroupInfoServiceObserverImpl.forceMembershipChange called") ;
        doMembershipChange() ;
    }

    @Override
    // This method is called when the client is informed about a cluster
    // membership change through ClientGroupManager.receive_star.
    public void membershipChange() {
        fineLog( "GroupInfoServiceObserverImpl.membershipChange called") ;
        doMembershipChange() ;
    }

    private void doMembershipChange() {
	try {
	    List instanceInfoList =
                gis.getClusterInstanceInfo((String[])null, rr.getHostPortList() );
	    if (instanceInfoList != null && instanceInfoList.size() > 0) {
                rr.setClusterInstanceInfo(instanceInfoList);
	    }
	} catch(Exception e) {
	    _logger.log(Level.SEVERE,
                "groupinfoservice.membership.notification.problem", new Object[] {e});
	}
    }
}