Package org.apache.tapestry5.http.internal.services

Class ClusteredSessionImpl

java.lang.Object

org.apache.tapestry5.http.internal.services.SessionImpl

org.apache.tapestry5.http.internal.services.ClusteredSessionImpl

All Implemented Interfaces:

Session

public class ClusteredSessionImpl
extends SessionImpl

A thin wrapper around HttpSession that supports re-storing of mutable session attributes at the end of the request (see restoreDirtyObjects()). This is only used when clustering.

Since:

5.3

See Also:

SessionPersistedObjectAnalyzer

Constructor Summary

Constructors

Constructor	Description
ClusteredSessionImpl(HttpServletRequest request, HttpSession session, SessionLock lock, SessionPersistedObjectAnalyzer analyzer)

Method Summary

Modifier and Type	Method	Description
Object	getAttribute(String name)	Returns the value previously stored in the session.
void	invalidate()	Invalidates this session then unbinds any objects bound to it.
void	restoreDirtyObjects()	Re-stores dirty objects back into the session.
void	setAttribute(String name, Object value)	Sets the value of an attribute.

Methods inherited from class org.apache.tapestry5.http.internal.services.SessionImpl

getAttributeNames, getAttributeNames, getMaxInactiveInterval, isInvalidated, setMaxInactiveInterval

Methods inherited from class java.lang.Object

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

Constructor Detail

ClusteredSessionImpl

public ClusteredSessionImpl(HttpServletRequest request,
                            HttpSession session,
                            SessionLock lock,
                            SessionPersistedObjectAnalyzer analyzer)

Method Detail

getAttribute

public Object getAttribute(String name)

Description copied from interface: Session

Returns the value previously stored in the session.

Specified by:

getAttribute in interface Session

Overrides:

getAttribute in class SessionImpl

setAttribute

public void setAttribute(String name,
                         Object value)

Description copied from interface: Session

Sets the value of an attribute. If the value is null, then the attribute is deleted.

Specified by:

setAttribute in interface Session

Overrides:

setAttribute in class SessionImpl

invalidate

public void invalidate()

Description copied from interface: Session

Invalidates this session then unbinds any objects bound to it.

Specified by:

invalidate in interface Session

Overrides:

invalidate in class SessionImpl

restoreDirtyObjects

public void restoreDirtyObjects()

Description copied from interface: Session

Re-stores dirty objects back into the session. This is necessary to support clustering, because (in most application servers) session objects are only broadcast around the cluster from setAttribute(). If a mutable session object is read and changed, those changes will be limited to a single server in the cluster, which can cause confusing application failures in the event of a failover. Does nothing if there are no changes, or the session has been invalidated.

Specified by:

restoreDirtyObjects in interface Session

Overrides:

restoreDirtyObjects in class SessionImpl

See Also:

OptimizedSessionPersistedObject, OptimizedSessionPersistedObjectAnalyzer, ImmutableSessionPersistedObject