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/*
 * @(#)MemoryCallback.java	1.4 06/29/07
 */ 

package com.sun.messaging.jmq.jmsserver.memory;


/**
 * this class is used by the Client->Broker or
 * broker->broker flow control to request notification
 * when messages can resume
 *
 * Any client interested in receiving notifications when
 * either memory levels have changed or a specific level
 * of free memory should implement this method and register
 * using the MemoryManager:registerMemoryCallback method.
 * When memory levels change, updateMemory will be called.
 * 

* To receive callbacks when a specific amount of memory is * available OR resume should be called, register the Callback * with MemoryManager:notifyWhenAvailable(). * * @see MemoryManager */ public interface MemoryCallback { /** * called in respones to a notifyWhenAvailable request * * @param cnt value of JMQSize at this time * @param memory value of JMQBytes at this time * @param max value of JMQMaxMsgBytes */ public void resumeMemory(int cnt, long memory, long max); /** * called when the memory level has been changed * because of a state change (e.g. green -> yellow) * * @param cnt value of JMQSize at this time * @param memory value of JMQBytes at this time * @param max value of JMQMaxMsgBytes */ public void updateMemory(int cnt, long memory, long max); } /* * EOF */





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