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package com.sun.enterprise.admin.monitor.stats;
import org.glassfish.j2ee.statistics.Stats;
import org.glassfish.j2ee.statistics.CountStatistic;
import org.glassfish.j2ee.statistics.BoundedRangeStatistic;
import org.glassfish.j2ee.statistics.RangeStatistic;

/**
 * Stats interface for the monitorable attributes of the
 * a generic ThreadPool. This combines the statistics that were exposed in 7.0
 * with the new ones. In 8.0, the generic Thread Pool that can be used by any component
 * in the server runtime is introduced.
 * @author Kedar Mhaswade
 * @since S1AS8.0
 * @version $Revision: 1.4 $
 */

public interface ThreadPoolStats extends Stats {
    
    /** Returns the statistical information about the number of Threads in the associated ThreaPool, 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 getCurrentNumberOfThreads();
    
    /** Returns the total number of available threads, as an instance of {@link CountStatistic}.
     * @return		an instance of {@link CountStatistic}
     */
    public CountStatistic getNumberOfAvailableThreads();
    
    /** Returns the number of busy threads, as an instance of {@link CountStatistic}.
     * @return		an instance of {@link CountStatistic}
     */
    public CountStatistic getNumberOfBusyThreads();
    
    /**
     * Returns the statistical information about the average completion time of a work item in milliseconds.
     * @return	an instance of {@link RangeStatistic}
     */
    public RangeStatistic getAverageWorkCompletionTime();
    
    /** Returns the the total number of work items added so far to the work queue associated with threadpool.
     * @return		an instance of {@link CountStatistic}
     */
    public CountStatistic getTotalWorkItemsAdded();
    
    /**
     * Returns average time in milliseconds a work item waited in the work queue before getting processed.
     * @return		an instance of {@link RangeStatistic}
     */
    public RangeStatistic getAverageTimeInQueue();
    
    /**
     * Returns the work items in queue
     * @return	an instance of {@link BoundedRangeStatistic}
     */
    public BoundedRangeStatistic getNumberOfWorkItemsInQueue();
    
}