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/*
 * $Id: EJBPoolStats.java,v 1.2 2007/05/05 05:31:02 tcfujii Exp $
 * $Date: 2007/05/05 05:31:02 $
 * $Revision: 1.2 $
 */

package com.sun.appserv.management.monitor.statistics;
import javax.management.j2ee.statistics.Stats;
import javax.management.j2ee.statistics.CountStatistic;
import javax.management.j2ee.statistics.BoundedRangeStatistic;

/** A Stats interface to represent the statistical data exposed by an EJB Bean Pool.
 * These are based on the statistics exposed in S1AS7.0. 
 * All the EJB Pool implementations should expose statistical data by implementing this interface.
 */

public interface EJBPoolStats extends Stats
{

	/** Returns the statistical information about the number of EJBs in the associated pool, as an instance of BoundedRangeStatistic.
	 * This returned value gives an idea about how the pool is changing.
	 * @return		an instance of {@link BoundedRangeStatistic}
     */
    public BoundedRangeStatistic getNumBeansInPool();
    
    /** Returns the number of threads waiting for free Beans, as an instance of CountStatistic.
	 * This indicates the congestion of requests.
	 * @return		an instance of {@link BoundedRangeStatistic}
     */
    public BoundedRangeStatistic getNumThreadsWaiting();
    
    /** Returns the number of Beans created in associated pool so far over time, since the gathering of data started, as a CountStatistic.
	 * @return		an instance of {@link CountStatistic}
     */
    public CountStatistic getTotalBeansCreated();
    
    /** Returns the number of Beans destroyed from associated pool so far over time, since the gathering of data started, as a CountStatistic.
	 * @return		an instance of {@link CountStatistic}
     */
    public CountStatistic getTotalBeansDestroyed();
    
    /** Returns the maximum number of messages to load into a JMS session, at a time, as a CountStatistic.
	 * @return		an instance of {@link CountStatistic}
     */
    public CountStatistic getJMSMaxMessagesLoad();
}