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/*
 * $Header: /cvs/glassfish/appserv-api/src/java/com/sun/appserv/management/ext/lb/LoadBalancer.java,v 1.2 2007/05/05 05:30:49 tcfujii Exp $
 * $Revision: 1.2 $
 * $Date: 2007/05/05 05:30:49 $
 */

package com.sun.appserv.management.ext.lb;

import java.util.Date;

import static com.sun.appserv.management.base.XTypes.*;
import com.sun.appserv.management.base.AMX;

/**
   Runtime counterpart for the config MBean {@link com.sun.appserv.management.config.LoadBalancerConfig} 
   representing the load-balancer element.
 */
public interface LoadBalancer extends AMX {

    /** The j2eeType as returned by {@link com.sun.appserv.management.base.AMX#getJ2EEType}. */
    public static final String	J2EE_TYPE = LOAD_BALANCER;

    /**
      Applies changes in the corresponding configuration to this LB 
     */
    public void applyLBChanges();        

    /**
      @return true if there are pending changes for this LB
     */
    public boolean isApplyChangeRequired();       

    /**
      Exports the corresponding LBConfig information and returns the contents as a string.
      @see com.sun.appserv.management.config.LBConfig
     */
    public String getLoadBalancerXML();    
      
    /**
      Returns the timestamp of the most recent export of corresponding LBConfig
     */
    public Date getLastExported();        
    
    /**
      Returns the timestamp of the most recent application of corresponding LBConfig
     */
    public Date getLastApplied();            

    /**
      Returns the timestamp of the last time the stats on this loadbalancer were reset
     */
    public Date getLastResetTime();            

    /**
      Reset the monitoring stats on this loadbalancer.
     */
    public void resetStats();
    
    /**
      Reset the monitoring stats on this loadbalancer.
     */
    public boolean testConnection();
            
    /**
     * Returns the uhealthy/healthy/quiesced status for an insatnce load balanced
     * by this load balancer.
     */
    public String getStatus(String instanceName);     
}