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package org.glassfish.enterprise.iiop.impl;

import com.sun.corba.ee.spi.folb.ClusterInstanceInfo;
import com.sun.corba.ee.spi.folb.GroupInfoService;
import com.sun.corba.ee.spi.folb.GroupInfoServiceObserver;
import org.glassfish.logging.annotation.LogMessageInfo;

import java.util.List;
import java.util.logging.Level;

import static org.glassfish.enterprise.iiop.impl.NamingClusterInfoImpl.logger;

/**
 * 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 {
    @LogMessageInfo(message = "Problem with membership change notification. Exception occurred : {0}",
    cause = "check server.log for details",
    action = "check network configuration and cluster setup")
    public static final String GROUPINFOSERVICE_MEMBERSHIP_NOTIFICATION_PROBLEM = "AS-ORB-00003";

    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() {
        doMembershipChange();
        if (logger.isLoggable(Level.FINE)) {
            logger.log(Level.FINE, "GroupInfoServiceObserverImpl.forceMembershipChange called");
        }
    }

    @Override
    // This method is called when the client is informed about a cluster
    // membership change through ClientGroupManager.receive_star.
    public void membershipChange() {
        doMembershipChange();
        if (logger.isLoggable(Level.FINE)) {
            logger.log(Level.FINE, "GroupInfoServiceObserverImpl.membershipChange called");
        }
    }

    private void doMembershipChange() {
        try {
            List instanceInfoList =
                    gis.getClusterInstanceInfo(null, rr.getHostPortList());
            if (instanceInfoList != null && instanceInfoList.size() > 0) {
                rr.setClusterInstanceInfo(instanceInfoList);
            }
        } catch (Exception e) {
            logger.log(Level.SEVERE, GROUPINFOSERVICE_MEMBERSHIP_NOTIFICATION_PROBLEM, e);
            logger.log(Level.SEVERE, "", e);
        }
    }
}