org.apache.catalina.ha.session
Class DeltaSession

java.lang.Object
  org.apache.catalina.session.StandardSession
      org.apache.catalina.ha.session.DeltaSession

All Implemented Interfaces:

Externalizable, Serializable, HttpSession, ClusterSession, Session, ReplicatedMapEntry

public class DeltaSession
extends StandardSession
implements Externalizable, ClusterSession, ReplicatedMapEntry

Similar to the StandardSession except that this session will keep track of deltas during a request.

Version:

$Id: DeltaSession.java 1327623 2012-04-18 18:46:41Z kkolinko $

Author:

Filip Hanik

See Also:

Serialized Form

Field Summary

protected Lock	diffLock
static Log	log
protected static StringManager	sm The string manager for this package.

Fields inherited from class org.apache.catalina.session.StandardSession

accessCount, ACTIVITY_CHECK, attributes, authType, creationTime, EMPTY_ARRAY, excludedAttributes, expiring, facade, id, info, isNew, isValid, LAST_ACCESS_AT_START, lastAccessedTime, listeners, manager, maxInactiveInterval, NOT_SERIALIZED, notes, principal, sessionContext, STRICT_SERVLET_COMPLIANCE, support, thisAccessedTime

Fields inherited from interface org.apache.catalina.Session

SESSION_ACTIVATED_EVENT, SESSION_CREATED_EVENT, SESSION_DESTROYED_EVENT, SESSION_PASSIVATED_EVENT

Constructor Summary

DeltaSession()

DeltaSession(Manager manager)
Construct a new Session associated with the specified Manager.

Method Summary

void	accessEntry() Access to an existing object.
void	applyDiff(byte[] diff, int offset, int length) Applies a diff to an existing object.
void	endAccess() End the access and register to ReplicationValve (crossContext support)
protected boolean	exclude(String name) Exclude attributes from replication.
void	expire(boolean notify) Perform the internal processing required to invalidate this session, without triggering an exception if the session has already expired.
void	expire(boolean notify, boolean notifyCluster)
protected Object	getAttributeInternal(String name) Return the value of an attribute without a check for validity.
ClassLoader[]	getClassLoaders()
DeltaRequest	getDeltaRequest()
byte[]	getDiff() Returns a diff and sets the dirty map to false
long	getLastTimeReplicated() Return the last replicate time.
long	getVersion() For accuracy checking, a serialized attribute can contain a version number This number increases as modifications are made to the data.
boolean	isAccessReplicate() If this returns true, to replicate that an object has been accessed
protected boolean	isAttributeDistributable(String name, Object value) Check whether the Object can be distributed.
boolean	isDiffable() If this returns true, the map will extract the diff using getDiff() Otherwise it will serialize the entire object.
boolean	isDirty() Has the object changed since last replication and is not in a locked state
boolean	isPrimarySession() returns true if this session is the primary session, if that is the case, the manager can expire it upon timeout.
boolean	isValid() Return the isValid flag for this session.
void	lock() Lock during serialization
void	readExternal(ObjectInput in)
protected void	readObject(ObjectInputStream stream) Read a serialized version of this session object from the specified object input stream.
void	readObjectData(ObjectInput stream)
void	readObjectData(ObjectInputStream stream) Read a serialized version of the contents of this session object from the specified object input stream, without requiring that the StandardSession itself have been serialized.
void	recycle() Release all object references, and initialize instance variables, in preparation for reuse of this object.
void	removeAttribute(String name, boolean notify) Remove the object bound with the specified name from this session.
void	removeAttribute(String name, boolean notify, boolean addDeltaRequest)
protected void	removeAttributeInternal(String name, boolean notify, boolean addDeltaRequest)
void	resetDeltaRequest()
void	resetDiff() Resets the current diff state and resets the dirty flag
protected void	setAccessCount(int count)
void	setAttribute(String name, Object value) Bind an object to this session, using the specified name.
void	setAttribute(String name, Object value, boolean notify, boolean addDeltaRequest)
void	setAuthType(String authType) Set the authentication type used to authenticate our cached Principal, if any.
void	setAuthType(String authType, boolean addDeltaRequest)
void	setId(String id) Set the session identifier for this session.
void	setId(String id, boolean notify) Set the session identifier for this session and optionally notifies any associated listeners that a new session has been created.
void	setLastTimeReplicated(long lastTimeReplicated) Set the last replicate time.
void	setMaxInactiveInterval(int interval) Set the maximum time interval, in seconds, between client requests before the servlet container will invalidate the session.
void	setMaxInactiveInterval(int interval, boolean addDeltaRequest)
void	setNew(boolean isNew) Set the isNew flag for this session.
void	setNew(boolean isNew, boolean addDeltaRequest)
void	setOwner(Object owner) This method is called after the object has been created on a remote map.
void	setPrimarySession(boolean primarySession) Sets whether this is the primary session or not.
void	setPrincipal(Principal principal) Set the authenticated Principal that is associated with this Session.
void	setPrincipal(Principal principal, boolean addDeltaRequest)
void	setVersion(long version) Forces a certain version to a replicated map entry
String	toString() Return a string representation of this object.
void	unlock() Unlock after serialization
void	writeExternal(ObjectOutput out)
protected void	writeObject(ObjectOutputStream stream) Write a serialized version of this session object to the specified object output stream.
void	writeObjectData(ObjectOutput stream)
void	writeObjectData(ObjectOutputStream stream) Write a serialized version of the contents of this session object to the specified object output stream, without requiring that the StandardSession itself have been serialized.

Methods inherited from class org.apache.catalina.session.StandardSession

access, activate, addSessionListener, expire, fireContainerEvent, fireSessionEvent, getAttribute, getAttributeNames, getAuthType, getCreationTime, getCreationTimeInternal, getId, getIdInternal, getInfo, getLastAccessedTime, getLastAccessedTimeInternal, getManager, getMaxInactiveInterval, getNote, getNoteNames, getPrincipal, getServletContext, getSession, getSessionContext, getThisAccessedTime, getThisAccessedTimeInternal, getValue, getValueNames, invalidate, isNew, isValidInternal, keys, passivate, putValue, removeAttribute, removeAttributeInternal, removeNote, removeSessionListener, removeValue, setAttribute, setCreationTime, setManager, setNote, setValid, tellNew

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.catalina.Session

access, addSessionListener, expire, getAuthType, getCreationTime, getCreationTimeInternal, getId, getIdInternal, getInfo, getLastAccessedTime, getLastAccessedTimeInternal, getManager, getMaxInactiveInterval, getNote, getNoteNames, getPrincipal, getSession, getThisAccessedTime, getThisAccessedTimeInternal, removeNote, removeSessionListener, setCreationTime, setManager, setNote, setValid

Methods inherited from interface javax.servlet.http.HttpSession

getAttribute, getAttributeNames, getCreationTime, getId, getLastAccessedTime, getMaxInactiveInterval, getServletContext, getSessionContext, getValue, getValueNames, invalidate, isNew, putValue, removeAttribute, removeValue

Field Detail

log

public static final Log log

sm

protected static final StringManager sm

The string manager for this package.

diffLock

protected final Lock diffLock

Constructor Detail

DeltaSession

public DeltaSession()

DeltaSession

public DeltaSession(Manager manager)

Construct a new Session associated with the specified Manager.

Parameters:

manager - The manager with which this Session is associated

Method Detail

isDirty

public boolean isDirty()

Has the object changed since last replication and is not in a locked state

Specified by:

isDirty in interface ReplicatedMapEntry

Returns:

boolean

isDiffable

public boolean isDiffable()

If this returns true, the map will extract the diff using getDiff() Otherwise it will serialize the entire object.

Specified by:

isDiffable in interface ReplicatedMapEntry

Returns:

boolean

getDiff

public byte[] getDiff()
               throws IOException

Returns a diff and sets the dirty map to false

Specified by:

getDiff in interface ReplicatedMapEntry

Returns:

byte[]

Throws:

IOException

getClassLoaders

public ClassLoader[] getClassLoaders()

applyDiff

public void applyDiff(byte[] diff,
                      int offset,
                      int length)
               throws IOException,
                      ClassNotFoundException

Applies a diff to an existing object.

Specified by:

applyDiff in interface ReplicatedMapEntry

Parameters:

diff - byte[]

offset - int

length - int

Throws:

IOException

ClassNotFoundException

resetDiff

public void resetDiff()

Resets the current diff state and resets the dirty flag

Specified by:

resetDiff in interface ReplicatedMapEntry

lock

public void lock()

Lock during serialization

Specified by:

lock in interface ReplicatedMapEntry

unlock

public void unlock()

Unlock after serialization

Specified by:

unlock in interface ReplicatedMapEntry

setOwner

public void setOwner(Object owner)

Description copied from interface: ReplicatedMapEntry

This method is called after the object has been created on a remote map. On this method, the object can initialize itself for any data that wasn't

Specified by:

setOwner in interface ReplicatedMapEntry

Parameters:

owner - Object

isAccessReplicate

public boolean isAccessReplicate()

If this returns true, to replicate that an object has been accessed

Specified by:

isAccessReplicate in interface ReplicatedMapEntry

Returns:

boolean

accessEntry

public void accessEntry()

Access to an existing object.

Specified by:

accessEntry in interface ReplicatedMapEntry

isPrimarySession

public boolean isPrimarySession()

returns true if this session is the primary session, if that is the case, the manager can expire it upon timeout.

Specified by:

isPrimarySession in interface ClusterSession

Returns:

True if this session is primary

setPrimarySession

public void setPrimarySession(boolean primarySession)

Sets whether this is the primary session or not.

Specified by:

setPrimarySession in interface ClusterSession

Parameters:

primarySession - Flag value

setId

public void setId(String id,
                  boolean notify)

Set the session identifier for this session and optionally notifies any associated listeners that a new session has been created.

Specified by:

setId in interface Session

Overrides:

setId in class StandardSession

Parameters:

id - The new session identifier

notify - Should any associated listeners be notified that a new session has been created?

setId

public void setId(String id)

Set the session identifier for this session.

Specified by:

setId in interface Session

Overrides:

setId in class StandardSession

Parameters:

id - The new session identifier

setMaxInactiveInterval

public void setMaxInactiveInterval(int interval)

Description copied from class: StandardSession

Set the maximum time interval, in seconds, between client requests before the servlet container will invalidate the session. A zero or negative time indicates that the session should never time out.

Specified by:

setMaxInactiveInterval in interface HttpSession

Specified by:

setMaxInactiveInterval in interface Session

Overrides:

setMaxInactiveInterval in class StandardSession

Parameters:

interval - The new maximum interval

setMaxInactiveInterval

public void setMaxInactiveInterval(int interval,
                                   boolean addDeltaRequest)

setNew

public void setNew(boolean isNew)

Set the isNew flag for this session.

Specified by:

setNew in interface Session

Overrides:

setNew in class StandardSession

Parameters:

isNew - The new value for the isNew flag

setNew

public void setNew(boolean isNew,
                   boolean addDeltaRequest)

setPrincipal

public void setPrincipal(Principal principal)

Set the authenticated Principal that is associated with this Session. This provides an Authenticator with a means to cache a previously authenticated Principal, and avoid potentially expensive Realm.authenticate() calls on every request.

Specified by:

setPrincipal in interface Session

Overrides:

setPrincipal in class StandardSession

Parameters:

principal - The new Principal, or null if none

setPrincipal

public void setPrincipal(Principal principal,
                         boolean addDeltaRequest)

setAuthType

public void setAuthType(String authType)

Set the authentication type used to authenticate our cached Principal, if any.

Specified by:

setAuthType in interface Session

Overrides:

setAuthType in class StandardSession

Parameters:

authType - The new cached authentication type

setAuthType

public void setAuthType(String authType,
                        boolean addDeltaRequest)

isValid

public boolean isValid()

Return the isValid flag for this session.

Specified by:

isValid in interface Session

Overrides:

isValid in class StandardSession

endAccess

public void endAccess()

End the access and register to ReplicationValve (crossContext support)

Specified by:

endAccess in interface Session

Overrides:

endAccess in class StandardSession

expire

public void expire(boolean notify)

Perform the internal processing required to invalidate this session, without triggering an exception if the session has already expired.

Overrides:

expire in class StandardSession

Parameters:

notify - Should we notify listeners about the demise of this session?

expire

public void expire(boolean notify,
                   boolean notifyCluster)

recycle

public void recycle()

Release all object references, and initialize instance variables, in preparation for reuse of this object.

Specified by:

recycle in interface Session

Overrides:

recycle in class StandardSession

toString

public String toString()

Return a string representation of this object.

Overrides:

toString in class StandardSession

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

readObjectData

public void readObjectData(ObjectInputStream stream)
                    throws ClassNotFoundException,
                           IOException

Read a serialized version of the contents of this session object from the specified object input stream, without requiring that the StandardSession itself have been serialized.

Overrides:

readObjectData in class StandardSession

Parameters:

stream - The object input stream to read from

Throws:

ClassNotFoundException - if an unknown class is specified

IOException - if an input/output error occurs

readObjectData

public void readObjectData(ObjectInput stream)
                    throws ClassNotFoundException,
                           IOException

Throws:

ClassNotFoundException

IOException

writeObjectData

public void writeObjectData(ObjectOutputStream stream)
                     throws IOException

Write a serialized version of the contents of this session object to the specified object output stream, without requiring that the StandardSession itself have been serialized.

Overrides:

writeObjectData in class StandardSession

Parameters:

stream - The object output stream to write to

Throws:

IOException - if an input/output error occurs

writeObjectData

public void writeObjectData(ObjectOutput stream)
                     throws IOException

Throws:

IOException

resetDeltaRequest

public void resetDeltaRequest()

getDeltaRequest

public DeltaRequest getDeltaRequest()

isAttributeDistributable

protected boolean isAttributeDistributable(String name,
                                           Object value)

Check whether the Object can be distributed. The object is always distributable, if the cluster manager decides to never distribute it.

Overrides:

isAttributeDistributable in class StandardSession

Parameters:

name - The name of the attribute to check

value - The value of the attribute to check

Returns:

true if the attribute is distributable, false otherwise

exclude

protected boolean exclude(String name)

Exclude attributes from replication.

Overrides:

exclude in class StandardSession

Parameters:

name - the attribute's name

Returns:

true if attribute should not be replicated

removeAttribute

public void removeAttribute(String name,
                            boolean notify)

Remove the object bound with the specified name from this session. If the session does not have an object bound with this name, this method does nothing.

After this method executes, and if the object implements HttpSessionBindingListener, the container calls valueUnbound() on the object.

Overrides:

removeAttribute in class StandardSession

Parameters:

name - Name of the object to remove from this session.

notify - Should we notify interested listeners that this attribute is being removed?

Throws:

IllegalStateException - if this method is called on an invalidated session

removeAttribute

public void removeAttribute(String name,
                            boolean notify,
                            boolean addDeltaRequest)

setAttribute

public void setAttribute(String name,
                         Object value)

Bind an object to this session, using the specified name. If an object of the same name is already bound to this session, the object is replaced.

After this method executes, and if the object implements HttpSessionBindingListener, the container calls valueBound() on the object.

Specified by:

setAttribute in interface HttpSession

Overrides:

setAttribute in class StandardSession

Parameters:

name - Name to which the object is bound, cannot be null

value - Object to be bound, cannot be null

Throws:

IllegalArgumentException - if an attempt is made to add a non-serializable object in an environment marked distributable.

IllegalStateException - if this method is called on an invalidated session

setAttribute

public void setAttribute(String name,
                         Object value,
                         boolean notify,
                         boolean addDeltaRequest)

readObject

protected void readObject(ObjectInputStream stream)
                   throws ClassNotFoundException,
                          IOException

Read a serialized version of this session object from the specified object input stream.

IMPLEMENTATION NOTE : The reference to the owning Manager is not restored by this method, and must be set explicitly.

Overrides:

readObject in class StandardSession

Parameters:

stream - The input stream to read from

Throws:

ClassNotFoundException - if an unknown class is specified

IOException - if an input/output error occurs

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

writeObject

protected void writeObject(ObjectOutputStream stream)
                    throws IOException

Write a serialized version of this session object to the specified object output stream.

IMPLEMENTATION NOTE : The owning Manager will not be stored in the serialized representation of this Session. After calling readObject(), you must set the associated Manager explicitly.

IMPLEMENTATION NOTE : Any attribute that is not Serializable will be unbound from the session, with appropriate actions if it implements HttpSessionBindingListener. If you do not want any such attributes, be sure the distributable property of the associated Manager is set to true.

Overrides:

writeObject in class StandardSession

Parameters:

stream - The output stream to write to

Throws:

IOException - if an input/output error occurs

getAttributeInternal

protected Object getAttributeInternal(String name)

Return the value of an attribute without a check for validity.

removeAttributeInternal

protected void removeAttributeInternal(String name,
                                       boolean notify,
                                       boolean addDeltaRequest)

getLastTimeReplicated

public long getLastTimeReplicated()

Description copied from interface: ReplicatedMapEntry

Return the last replicate time.

Specified by:

getLastTimeReplicated in interface ReplicatedMapEntry

getVersion

public long getVersion()

Description copied from interface: ReplicatedMapEntry

For accuracy checking, a serialized attribute can contain a version number This number increases as modifications are made to the data. The replicated map can use this to ensure accuracy on a periodic basis

Specified by:

getVersion in interface ReplicatedMapEntry

Returns:

long - the version number or -1 if the data is not versioned

setLastTimeReplicated

public void setLastTimeReplicated(long lastTimeReplicated)

Description copied from interface: ReplicatedMapEntry

Set the last replicate time.

Specified by:

setLastTimeReplicated in interface ReplicatedMapEntry

setVersion

public void setVersion(long version)

Description copied from interface: ReplicatedMapEntry

Forces a certain version to a replicated map entry

Specified by:

setVersion in interface ReplicatedMapEntry

Parameters:

version - long

setAccessCount

protected void setAccessCount(int count)