com.h3c.util.persistence.cassandra.snapshotmgr

Interface DBSnapshotMgr

public interface DBSnapshotMgr

This interface specify the Persistence subject(Observable element) for backup listeners using the observer/listener design pattern. The registered backup services get notified when the persistence framework flush out all the current active transactions.So that backup process can init their DB backup.

Method Summary

Methods

Modifier and Type	Method and Description
DBstatus	getDatabaseStatus() Get the active status of Database.
void	registerBackupService(DBBackUpListener obj) Method to register the backup listener obj in persistence subject.
void	unregisterBackupService(DBBackUpListener obj) Method to unregister the specific backup listener in persistence subject.

Method Detail

registerBackupService

void registerBackupService(DBBackUpListener obj)
                           throws CassandraSnapShotException

Method to register the backup listener obj in persistence subject. The DB backup starts with this intimation so that database blocks new DB writes/reads, drain out all the current active transactions and ready for backup.Then the registered listeners will be notified to start the backup.

Parameters:

obj - The backup listener object to be registered.

Throws:

CassandraSnapShotException - Throws in case registration fails.

unregisterBackupService

void unregisterBackupService(DBBackUpListener obj)
                             throws CassandraSnapShotException

Method to unregister the specific backup listener in persistence subject. This informs the persistence layer that the backup operations completes and DB operations can continue as normal.

Parameters:

obj - The registered backup listener to unregister

Throws:

CassandraSnapShotException - Throws if unregister fails.

getDatabaseStatus

DBstatus getDatabaseStatus()

Get the active status of Database. DBstatus gives current status of persistence service. Backup service uses this information to calculate the delay in start the backup.

Returns:

Current status of persistence storage.