org.neo4j.causalclustering.core.replication.session

Class LocalSessionPool

java.lang.Object

org.neo4j.causalclustering.core.replication.session.LocalSessionPool

public class LocalSessionPool
extends Object

Keeps a pool of local sub-sessions, to be used under a single global session.

Constructor Summary

Constructors

Constructor and Description
LocalSessionPool(GlobalSession globalSession)

Method Summary

Modifier and Type	Method and Description
OperationContext	acquireSession() Acquires a session and returns the next unique operation context within that session.
GlobalSession	getGlobalSession()
long	openSessionCount()
void	releaseSession(OperationContext operationContext) Releases a previously acquired session using the operation context as a key.

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalSessionPool

public LocalSessionPool(GlobalSession globalSession)

Method Detail

getGlobalSession

public GlobalSession getGlobalSession()

acquireSession

public OperationContext acquireSession()

Acquires a session and returns the next unique operation context within that session. The session must be released when the operation has been successfully finished.

releaseSession

public void releaseSession(OperationContext operationContext)

Releases a previously acquired session using the operation context as a key. An unsuccessful operation should not be released, but it will leak a local session. The reason for not releasing an unsuccessful session is that operation handlers might restrict sequence numbers to occur in strict order, and thus an operation that it hasn't handled will block any future operations under that session. In general all operations should be retried until they do succeed, or the entire session manager should eventually be restarted, thus allocating a new global session to operate under.

openSessionCount

public long openSessionCount()