org.apache.jackrabbit.core.session
Class SessionState

java.lang.Object
  org.apache.jackrabbit.core.session.SessionState

public class SessionState
extends Object

Internal session state. This class keeps track of the lifecycle of a session and controls concurrent access to the session internals.

The session lifecycle is pretty simple: there are only two lifecycle states, "alive" and "closed", and only one possible state transition, from "alive" to "closed".

Concurrent access to session internals is controlled by the perform(SessionOperation) method that guarantees that no two operations are performed concurrently on the same session.

See Also:

JCR-890

Constructor Summary

SessionState(SessionContext context)
Creates a state instance for a session.

Method Summary

void	checkAlive() Throws an exception if this session is not alive.
boolean	close() Closes this session.
boolean	isAlive() Checks whether this session is alive.
<T> T	perform(SessionOperation<T> operation) Performs the given operation within a synchronized block.

Methods inherited from class java.lang.Object

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

Constructor Detail

SessionState

public SessionState(SessionContext context)

Creates a state instance for a session.

Parameters:

context - component context of this session

Method Detail

isAlive

public boolean isAlive()

Checks whether this session is alive. This method should generally only be called from within a performed SessionOperation, as otherwise there's no guarantee against another thread closing the session right after this method has returned.

Returns:

true if the session is alive, false otherwise

See Also:

Session.isLive()

checkAlive

public void checkAlive()
                throws RepositoryException

Throws an exception if this session is not alive.

Throws:

RepositoryException - throw if this session is not alive

perform

public <T> T perform(SessionOperation<T> operation)
          throws RepositoryException

Performs the given operation within a synchronized block. Special care is made to detect attempts to access the session concurrently and to log detailed warnings in such cases.

Parameters:

operation - session operation

Returns:

the return value of the executed operation

Throws:

RepositoryException - if the operation fails or if the session has already been closed

close

public boolean close()

Closes this session. Special care is made to detect attempts to access the session concurrently or to close it more than once, and to log detailed warnings in such cases.

Returns:

true if the session was closed, or false if the session had already been closed