org.eclipse.jetty.nosql.mongodb

Class MongoSessionIdManager

java.lang.Object

org.eclipse.jetty.util.component.AbstractLifeCycle

org.eclipse.jetty.server.session.AbstractSessionIdManager

org.eclipse.jetty.nosql.mongodb.MongoSessionIdManager

All Implemented Interfaces:

SessionIdManager, LifeCycle

public class MongoSessionIdManager
extends AbstractSessionIdManager

Based partially on the jdbc session id manager... Theory is that we really only need the session id manager for the local instance so we have something to scavenge on, namely the list of known ids this class has a timer that runs at the scavenge delay that runs a query for all id's known to this node and that have and old accessed value greater then the scavengeDelay. these found sessions are then run through the invalidateAll(id) method that is a bit hinky but is supposed to notify all handlers this id is now DOA and ought to be cleaned up. this ought to result in a save operation on the session that will change the valid field to false (this conjecture is unvalidated atm)

Nested Class Summary

Nested classes/interfaces inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

AbstractLifeCycle.AbstractLifeCycleListener

Nested classes/interfaces inherited from interface org.eclipse.jetty.util.component.LifeCycle

LifeCycle.Listener

Field Summary

Fields

Modifier and Type	Field and Description
protected Server	_server
protected Set<String>	_sessionsIds the collection of session ids known to this manager TODO consider if this ought to be concurrent or not

Fields inherited from class org.eclipse.jetty.server.session.AbstractSessionIdManager

_random, _reseed, _weakRandom, _workerName

Fields inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

_listeners, FAILED, RUNNING, STARTED, STARTING, STOPPED, STOPPING

Constructor Summary

Constructors

Constructor and Description
MongoSessionIdManager(Server server)
MongoSessionIdManager(Server server, com.mongodb.DBCollection sessions)

Method Summary

Methods

Modifier and Type	Method and Description
void	addSession(HttpSession session) Add a session to the list of known sessions for a given ID.
protected void	doStart()
protected void	doStop()
String	getClusterId(String nodeId) Get a cluster ID from a node ID.
String	getNodeId(String clusterId, HttpServletRequest request) Get a node ID from a cluster ID and a request
long	getPurgeInvalidAge()
long	getPurgeValidAge()
com.mongodb.DBCollection	getSessions()
boolean	idInUse(String sessionId) is the session id known to mongo, and is it valid
void	invalidateAll(String sessionId) Call HttpSession.invalidate() on all known sessions for the given id.
boolean	isPurgeEnabled()
protected void	purge() Purge is a process that cleans the mongodb cluster of old sessions that are no longer valid.
protected void	purgeFully() Purge is a process that cleans the mongodb cluster of old sessions that are no longer valid.
void	removeSession(HttpSession session) Remove session from the list of known sessions for a given ID.
protected void	scavenge() Scavenge is a process that periodically checks the tracked session ids of this given instance of the session id manager to see if they are past the point of expiration.
protected void	scavengeFully() ScavengeFully is a process that periodically checks the tracked session ids of this given instance of the session id manager to see if they are past the point of expiration.
void	setPurge(boolean purge)
void	setPurgeDelay(long purgeDelay)
void	setPurgeInvalidAge(long purgeValidAge) sets how old a session is to be persisted past the point it is no longer valid
void	setPurgeValidAge(long purgeValidAge) sets how old a session is to be persist past the point it is considered no longer viable and should be removed NOTE: set this value to 0 to disable purging of valid sessions
void	setScavengeDelay(long scavengeDelay) sets the scavengeDelay
void	setScavengePeriod(long scavengePeriod)

Methods inherited from class org.eclipse.jetty.server.session.AbstractSessionIdManager

getRandom, getReseed, getWorkerName, initRandom, newSessionId, setRandom, setReseed, setWorkerName

Methods inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

addLifeCycleListener, getState, getState, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, start, stop

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.jetty.util.component.LifeCycle

addLifeCycleListener, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, start, stop

Field Detail

_server

protected Server _server

_sessionsIds

protected final Set<String> _sessionsIds

the collection of session ids known to this manager TODO consider if this ought to be concurrent or not

Constructor Detail

MongoSessionIdManager

public MongoSessionIdManager(Server server)
                      throws UnknownHostException,
                             com.mongodb.MongoException

Throws:

UnknownHostException

com.mongodb.MongoException

MongoSessionIdManager

public MongoSessionIdManager(Server server,
                     com.mongodb.DBCollection sessions)

Method Detail

scavenge

protected void scavenge()

Scavenge is a process that periodically checks the tracked session ids of this given instance of the session id manager to see if they are past the point of expiration.

scavengeFully

protected void scavengeFully()

ScavengeFully is a process that periodically checks the tracked session ids of this given instance of the session id manager to see if they are past the point of expiration. NOTE: this is potentially devastating and may lead to serious session coherence issues, not to be used in a running cluster

purge

protected void purge()

Purge is a process that cleans the mongodb cluster of old sessions that are no longer valid. There are two checks being done here: - if the accessed time is older then the current time minus the purge invalid age and it is no longer valid then remove that session - if the accessed time is older then the current time minus the purge valid age then we consider this a lost record and remove it NOTE: if your system supports long lived sessions then the purge valid age should be set to zero so the check is skipped. The second check was added to catch sessions that were being managed on machines that might have crashed without marking their sessions as 'valid=false'

purgeFully

protected void purgeFully()

Purge is a process that cleans the mongodb cluster of old sessions that are no longer valid.

getSessions

public com.mongodb.DBCollection getSessions()

isPurgeEnabled

public boolean isPurgeEnabled()

setPurge

public void setPurge(boolean purge)

setScavengeDelay

public void setScavengeDelay(long scavengeDelay)

sets the scavengeDelay

setScavengePeriod

public void setScavengePeriod(long scavengePeriod)

setPurgeDelay

public void setPurgeDelay(long purgeDelay)

getPurgeInvalidAge

public long getPurgeInvalidAge()

setPurgeInvalidAge

public void setPurgeInvalidAge(long purgeValidAge)

sets how old a session is to be persisted past the point it is no longer valid

getPurgeValidAge

public long getPurgeValidAge()

setPurgeValidAge

public void setPurgeValidAge(long purgeValidAge)

sets how old a session is to be persist past the point it is considered no longer viable and should be removed NOTE: set this value to 0 to disable purging of valid sessions

doStart

protected void doStart()
                throws Exception

Overrides:

doStart in class AbstractSessionIdManager

Throws:

Exception

doStop

protected void doStop()
               throws Exception

Overrides:

doStop in class AbstractSessionIdManager

Throws:

Exception

idInUse

public boolean idInUse(String sessionId)

is the session id known to mongo, and is it valid

Parameters:

sessionId - The session ID without any cluster node extension

Returns:

True if the session ID is in use by at least one context.

addSession

public void addSession(HttpSession session)

Description copied from interface: SessionIdManager

Add a session to the list of known sessions for a given ID.

Parameters:

session - The session

removeSession

public void removeSession(HttpSession session)

Description copied from interface: SessionIdManager

Remove session from the list of known sessions for a given ID.

invalidateAll

public void invalidateAll(String sessionId)

Description copied from interface: SessionIdManager

Call HttpSession.invalidate() on all known sessions for the given id.

Parameters:

sessionId - The session ID without any cluster node extension

getClusterId

public String getClusterId(String nodeId)

Description copied from interface: SessionIdManager

Get a cluster ID from a node ID. Strip node identifier from a located session ID.

Returns:

the cluster id

getNodeId

public String getNodeId(String clusterId,
               HttpServletRequest request)

Description copied from interface: SessionIdManager

Get a node ID from a cluster ID and a request

Parameters:

clusterId - The ID of the session

request - The request that for the session (or null)

Returns:

The session ID qualified with the node ID.