Package com.aquima.web.session

Class ConcurrentSessionModificationMonitor

java.lang.Object

com.aquima.web.session.ConcurrentSessionModificationMonitor

All Implemented Interfaces:

com.blueriq.component.api.store.keyvalue.IKeyspaceEventListener, org.springframework.beans.factory.DisposableBean

public class ConcurrentSessionModificationMonitor
extends Object
implements com.blueriq.component.api.store.keyvalue.IKeyspaceEventListener, org.springframework.beans.factory.DisposableBean

This component detects when a session is about to be modified by multiple runtime nodes and interrupts the requests on all but the last request.

A request which is going to (potentially) modify the session must first register the session with this component and unregister when the request is done. This component will write a "guard" key in the key-value store representing the registered request and session. It also receives notifications from the keyspace monitor when other guards are written and can detect if another request for the same session has started. When a concurrent request is detected, all other registered requests for that session are interrupted.

Since:

11.0

Author:

Petru Galanton

Constructor Summary

Constructors

Constructor	Description
ConcurrentSessionModificationMonitor(com.blueriq.component.api.store.keyvalue.IKeyspaceMonitor keyspaceMonitor, com.blueriq.component.api.store.keyvalue.IKeyValueStore keyValueStore)

Method Summary

Modifier and Type	Method	Description
void	destroy()
protected String	getNamespacedGuard(com.blueriq.component.api.IAquimaSession session, String namespace, String token)
void	onEvent(com.blueriq.component.api.store.keyvalue.KeyspaceEvent event, String key)
void	register(com.blueriq.component.api.IAquimaSession session, String namespace, String token)	Registers a request that is going to modify the given session.
void	unregister(com.blueriq.component.api.IAquimaSession session, String namespace, String token)	Unregisters a previously registered request.

Methods inherited from class java.lang.Object

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

Constructor Details

ConcurrentSessionModificationMonitor

public ConcurrentSessionModificationMonitor(com.blueriq.component.api.store.keyvalue.IKeyspaceMonitor keyspaceMonitor,
 com.blueriq.component.api.store.keyvalue.IKeyValueStore keyValueStore)

Method Details

destroy

public void destroy()
             throws Exception

Specified by:

destroy in interface org.springframework.beans.factory.DisposableBean

Throws:

Exception

onEvent

public void onEvent(com.blueriq.component.api.store.keyvalue.KeyspaceEvent event,
 String key)

Specified by:

onEvent in interface com.blueriq.component.api.store.keyvalue.IKeyspaceEventListener

register

public void register(com.blueriq.component.api.IAquimaSession session,
 String namespace,
 String token)

Registers a request that is going to modify the given session. The request is identified and distinguished from other requests through the token parameter, which should be different for each request (eg. a randomly generated GUID). The namespace parameter helps to group related requests and can be, for example, the HTTP session id.

Parameters:

session - the session which should be monitored for concurrent modifications

namespace - the namespace for this request

token - a unique identifier for this request

unregister

public void unregister(com.blueriq.component.api.IAquimaSession session,
 String namespace,
 String token)

Unregisters a previously registered request. The session, namespace and token parameters must be the same as those used to register. This method should be called at the end of the request.

Parameters:

session - the session that should no longer be monitored.

namespace - the namespace for the request

token - the unique identifier for the request

getNamespacedGuard

protected String getNamespacedGuard(com.blueriq.component.api.IAquimaSession session,
 String namespace,
 String token)