com.aliyun.openservices.loghub.client.ILogHubCheckPointTracker Maven / Gradle / Ivy
package com.aliyun.openservices.loghub.client;
import com.aliyun.openservices.loghub.client.exceptions.LogHubCheckPointException;
/**
* Provide an interface for the user to save a shard's check point to the
* outside system. It provide two mode to save check point : to memory / to
* persistent system
*
* when the shard is taken by other worker, the ILogHubCheckPointTracker will
* try to persistent the last save checkpoint in memory to out side system
*/
public interface ILogHubCheckPointTracker {
/**
* Save the check point into the outside system or just save into memory
* according to the parameter @persistent if true of false
*
* @param persistent if it is set to true, save the check point to outside system,
* other wise save it to memory
*/
void saveCheckPoint(boolean persistent) throws LogHubCheckPointException;
/**
* Get the last saved check point
*
* @return the last saved checkpoint
*/
String getCheckPoint();
/**
* Get the cursor of current fetched data.
*
* @return The cursor of current fetched data.
*/
String getCurrentCursor();
}