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The addc-queues library supplies support for internal persistent queues using an optional DERBY database for storage.

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package com.addc.commons.queue;

/**
 * The IMbQueueStats interface defines the MBean contract for MBeans showing statistics
 * for a {@link PersistingQueue}
 *
 */
public interface IMbQueueStats {

    /**
     * Get the number of items put to the queue
     * 
     * @return The number of items put to the queue
     */
    long getItemsCreated();

    /**
     * Get the number of items dropped from the queue
     * 
     * @return The number of elements dropped from the queue
     */
    long getItemsDropped();

    /**
     * Get the number of items read from persistence
     * 
     * @return The number of items read from persistence
     */
    long getItemsReadFromPersistence();

    /**
     * Get the number of items written to persistence
     * 
     * @return The number of items written to persistence
     */
    long getItemsWrittenToPersistence();

}