ai.grakn.engine.backgroundtasks.taskstorage

Class SynchronizedStateStorage

java.lang.Object

ai.grakn.engine.backgroundtasks.taskstorage.SynchronizedStateStorage

public class SynchronizedStateStorage
extends Object

Manages the state of background BackgroundTask in a synchronized manner withing a cluster. This means that all updates must be performed by acquiring a distributed mutex so that no concurrent writes are possible.

Author:

Denis Lobanov, Alexandra Orth

Method Summary

Modifier and Type	Method and Description
void	close()
org.apache.curator.framework.CuratorFramework	connection()
static SynchronizedStateStorage	getInstance()
SynchronizedState	getState(String id)
void	newState(String id, TaskStatus status, String engineID, String checkpoint)
Boolean	updateState(String id, TaskStatus status, String engineID, String checkpoint)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getInstance

public static SynchronizedStateStorage getInstance()
                                            throws Exception

Throws:

Exception

connection

public org.apache.curator.framework.CuratorFramework connection()

close

public void close()

newState

public void newState(String id,
                     TaskStatus status,
                     String engineID,
                     String checkpoint)
              throws Exception

Throws:

Exception

updateState

public Boolean updateState(String id,
                           TaskStatus status,
                           String engineID,
                           String checkpoint)

getState

public SynchronizedState getState(String id)