org.jboss.web.tomcat.service.session
Class FieldBasedClusteredSipApplicationSession

java.lang.Object
  org.mobicents.servlet.sip.core.session.SipApplicationSessionImpl
      org.jboss.web.tomcat.service.session.ClusteredSipApplicationSession
          org.jboss.web.tomcat.service.session.JBossCacheClusteredSipApplicationSession
              org.jboss.web.tomcat.service.session.FieldBasedClusteredSipApplicationSession

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, SipApplicationSession, org.jboss.aspects.patterns.observable.Observer, MobicentsSipApplicationSession

public class FieldBasedClusteredSipApplicationSession
extends JBossCacheClusteredSipApplicationSession
implements org.jboss.aspects.patterns.observable.Observer

Implementation of a clustered sip application session for the JBossCacheManager. This class is based on the following Jboss class org.jboss.web.tomcat.service.session.FieldBasedClusteredSession JBOSS AS 4.2.2 Tag The replication granularity level is field based; that is, we replicate only the dirty field in a POJO that is part of a session attribute. E.g., once a user do setAttribute("pojo", pojo), pojo will be monitored automatically for field changes and accessing. It offers couple of advantages:

• pojo.setName(), for example, will only replicate the name field in the pojo. And thus is more efficient.
• If pojo has a complex object graph, we will handle that automtically providing that the children object is also aspectized.

Note that in current version, all the attributes and its associated childre graph objects are required to be aspectized. That is, you can't simply declare them as Serializable. This is restricted because of the marshalling/unmarshalling issue.

We use JBossCache for our internal, replicated data store. The internal structure is like in JBossCache:

 /SIPSESSION
    /hostname
       /sip_application_name    (path + session id is unique)
          /sipappsessionid    Map(id, session)
                          (VERSION_KEY, version)  // Used for version tracking. version is an Integer.
             /ATTRIBUTE    Map(can be empty)
                /pojo      Map(field name, field value) (pojo naming is by field.getName())

 

Author:

Ben Wang, Brian Stansberry, Jean Deruelle

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.mobicents.servlet.sip.core.session.SipApplicationSessionImpl

SipApplicationSessionImpl.SipApplicationSessionTimerTask

Nested classes/interfaces inherited from interface javax.servlet.sip.SipApplicationSession

SipApplicationSession.Protocol

Field Summary

protected java.util.Map	attributes_
protected static java.lang.String	info Descriptive information describing this Session implementation.

Fields inherited from class org.jboss.web.tomcat.service.session.JBossCacheClusteredSipApplicationSession

proxy_

Fields inherited from class org.jboss.web.tomcat.service.session.ClusteredSipApplicationSession

alwaysReplicateMetadata, excludedAttributes, firstAccess, futureExpirationTimeOnPassivation, hasActivationListener, httpSessionsOnPassivation, invalidationPolicy, isSessionModifiedSinceLastSave, lastReplicated, maxUnreplicatedFactor, maxUnreplicatedInterval, outdatedTime, outdatedVersion, replicationExcludes, sessionAttributesDirty, sessionMetadataDirty, sipSessionsOnPassivation, sm, version

Fields inherited from class org.mobicents.servlet.sip.core.session.SipApplicationSessionImpl

creationTime, currentRequestHandler, executorService, expirationTimerFuture, expirationTimerTask, expired, httpSessions, invalidateWhenReady, isValid, key, lastAccessedTime, readyToInvalidate, servletTimers, sipApplicationSessionAttributeMap, sipContext, sipSessions

Fields inherited from interface org.mobicents.servlet.sip.core.session.MobicentsSipApplicationSession

SIP_APPLICATION_KEY_PARAM_NAME

Constructor Summary

protected

FieldBasedClusteredSipApplicationSession(SipApplicationSessionKey key, SipContext sipContext)

Method Summary

protected boolean	canAttributeBeReplicated(java.lang.Object attribute) Overrides the superclass to allow instrumented classes and non-serializable Collections and Maps.
void	fireChange(org.jboss.aspects.patterns.observable.Subject subject) Call back handler for the aop Subject/Observer pattern.
protected java.lang.Object	getJBossInternalAttribute(java.lang.String name)
protected java.util.Map	getJBossInternalAttributes()
protected java.util.Set	getJBossInternalKeys()
protected boolean	isMutable(java.lang.Object attribute) Overrides the superclass to treat classes implementing Subject as "immutable", since as an Observer we will detect any changes to those types.
protected java.lang.String[]	keys() Method inherited from Tomcat.
protected void	populateAttributes() Populate the attributes stored in the distributed store to the local transient map.
protected java.lang.Object	removeJBossInternalAttribute(java.lang.String name, boolean localCall, boolean localOnly)
void	removeMyself() Remove myself from the internal store.
void	removeMyselfLocal() Remove myself from the local internal store.
protected java.lang.Object	setJBossInternalAttribute(java.lang.String key, java.lang.Object value) This is the hook for setAttribute.
java.lang.String	toString() Return a string representation of this object.

Methods inherited from class org.jboss.web.tomcat.service.session.JBossCacheClusteredSipApplicationSession

establishProxy, initAfterLoad, processSessionRepl, removeAttributeInternal, removeFromManager, removeJBossInternalAttribute

Methods inherited from class org.jboss.web.tomcat.service.session.ClusteredSipApplicationSession

access, activate, clearOutdated, expire, expire, getAttribute, getAttributeInternal, getAttributeNames, getAttributesInternal, getExceedsMaxUnreplicatedInterval, getLastReplicated, getMaxUnreplicatedFactor, getMaxUnreplicatedInterval, getReplicateSessionBody, getSessionAttributesDirty, getSessionMetadataDirty, getUseJK, getVersion, incrementVersion, isGetDirty, isNewData, isOutdated, isSessionDirty, isValid, isValid, passivate, readExternal, removeAttributeInternal, removeAttributeInternal, removeExcludedAttributes, sessionAttributesDirty, sessionDirty, sessionMetadataDirty, setAttribute, setInternalAttribute, setIsOutdated, setMaxUnreplicatedFactor, setMaxUnreplicatedInterval, setOutdatedVersion, setVersion, updateAccessTimeFromOutdatedTime, updateLastReplicated, writeExternal

Methods inherited from class org.mobicents.servlet.sip.core.session.SipApplicationSessionImpl

addHttpSession, addServletTimer, addSipSession, encodeURI, encodeURL, findHttpSession, getApplicationName, getCreationTime, getCurrentRequestHandler, getExecutorService, getExpirationTime, getId, getInvalidateWhenReady, getKey, getLastAccessedTime, getSession, getSessions, getSessions, getSipContext, getSipSession, getTimer, getTimers, hasTimerListener, invalidate, isExpired, isReadyToInvalidate, notifySipApplicationSessionListeners, onSipSessionReadyToInvalidate, removeAttribute, removeHttpSession, removeServletTimer, removeSipSession, setCurrentRequestHandler, setExpired, setExpires, setInvalidateWhenReady, setKey, tryToInvalidate

Methods inherited from class java.lang.Object

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

Field Detail

info

protected static final java.lang.String info

Descriptive information describing this Session implementation.

See Also:

Constant Field Values

attributes_

protected transient java.util.Map attributes_

Constructor Detail

FieldBasedClusteredSipApplicationSession

protected FieldBasedClusteredSipApplicationSession(SipApplicationSessionKey key,
                                                   SipContext sipContext)

Method Detail

toString

public java.lang.String toString()

Return a string representation of this object.

Overrides:

toString in class ClusteredSipApplicationSession

removeMyself

public void removeMyself()

Description copied from class: ClusteredSipApplicationSession

Remove myself from the internal store.

Specified by:

removeMyself in class ClusteredSipApplicationSession

removeMyselfLocal

public void removeMyselfLocal()

Description copied from class: ClusteredSipApplicationSession

Remove myself from the local internal store.

Specified by:

removeMyselfLocal in class ClusteredSipApplicationSession

populateAttributes

protected void populateAttributes()

Populate the attributes stored in the distributed store to the local transient map. Add ourself as an Observer to newly found attributes and remove ourself as an Observer to existing attributes that are no longer in the distributed store.

Specified by:

populateAttributes in class JBossCacheClusteredSipApplicationSession

getJBossInternalAttribute

protected java.lang.Object getJBossInternalAttribute(java.lang.String name)

Specified by:

getJBossInternalAttribute in class ClusteredSipApplicationSession

isMutable

protected boolean isMutable(java.lang.Object attribute)

Overrides the superclass to treat classes implementing Subject as "immutable", since as an Observer we will detect any changes to those types.

Overrides:

isMutable in class ClusteredSipApplicationSession

removeJBossInternalAttribute

protected java.lang.Object removeJBossInternalAttribute(java.lang.String name,
                                                        boolean localCall,
                                                        boolean localOnly)

Specified by:

removeJBossInternalAttribute in class JBossCacheClusteredSipApplicationSession

getJBossInternalAttributes

protected java.util.Map getJBossInternalAttributes()

Specified by:

getJBossInternalAttributes in class ClusteredSipApplicationSession

getJBossInternalKeys

protected java.util.Set getJBossInternalKeys()

keys

protected java.lang.String[] keys()

Method inherited from Tomcat. Return zero-length based string if not found.

Overrides:

keys in class ClusteredSipApplicationSession

canAttributeBeReplicated

protected boolean canAttributeBeReplicated(java.lang.Object attribute)

Overrides the superclass to allow instrumented classes and non-serializable Collections and Maps.

Overrides:

canAttributeBeReplicated in class ClusteredSipApplicationSession

Parameters:

attribute - the attribute

Returns:

true if attribute is null, Serializable or an array of primitives.

setJBossInternalAttribute

protected java.lang.Object setJBossInternalAttribute(java.lang.String key,
                                                     java.lang.Object value)

This is the hook for setAttribute. Note that in this FieldBasedClusteredSession using aop, user should not call setAttribute call too often since this will re-connect the attribute with the internal cache (and this is expensive).

Specified by:

setJBossInternalAttribute in class ClusteredSipApplicationSession

Parameters:

key -

value -

Returns:

Object

fireChange

public void fireChange(org.jboss.aspects.patterns.observable.Subject subject)

Call back handler for the aop Subject/Observer pattern. We subscribe to the event of field write and mark ourself dirty.

Specified by:

fireChange in interface org.jboss.aspects.patterns.observable.Observer

Parameters:

subject - the object we are Observing