mq5.0-source.main.persist.txnlog.src.main.java.com.sun.messaging.jmq.io.txnlog.CheckPointListener Maven / Gradle / Ivy
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/*
* @(#)CheckPointListener.java 1.2 06/29/07
*/
package com.sun.messaging.jmq.io.txnlog;
/**
* A broker instance sets itself as a CheckPointListener
to the
* TransactionLogWriter. When the log writer detects that a sync
* operation is required, it calls the listener's checkpoint()
* method.
*
* When the check point listener is called, the broker SHOULD
* sync its message store ASAP and then call
* TransactionLogWriter.checkpoint() to instruct the log writer
* to perform a check point sync operation.
*
* In general, the log writer's performance will decrease if the
* broker fails to call TransactionLogWriter.checkpoint() after
* the check point listener is notified.
*
*/
public interface CheckPointListener {
/**
* Notify broker to perform a check point sync with the
* TransactionLogWriter
.
*
* When received the notification, broker should sync its
* message store and calls TransactionLogWriter.checkpoint()
* to inform the TransactionLogWriter that the message store
* is synced.
*
* @see TransactionLogWriter#setCheckPointListener(CheckPointListener)
* @see TransactionLogWriter#checkpoint
*/
public void checkpoint();
}