6.4.4 Listeners that operate in association with events occurring in the database session failover functionality

When using the database session failover functionality, the sessionDidActivate() method in the javax.servlet.http.HttpSessionActivationListener interface is invoked when inheriting of a global session occurs. In that case, the sessionCreated() method in the javax.servlet.http.HttpSessionListener interface is not invoked.

With processing using an HTTP session, the listeners associated with the HTTP session corresponding to events stipulated in Java EE operate. Listeners associated with an HTTP session are the classes that implement the following interfaces:

javax.servlet.http.HttpSessionListener
javax.servlet.http.HttpSessionActivationListener
javax.servlet.http.HttpSessionAttributeListener
javax.servlet.http.HttpSessionBindingListener

When using the database session failover functionality, listeners associated with an HTTP session operate with events in the database session failover functionality as key factors.

The following table describes mapping among events stipulated in Java EE, events that occur in the database session failover functionality, and listeners that operate with events as key factors.

Table 6‒13: Events that occur in the database session failover functionality and listeners to be operated
Sr. No.	Event stipulated in Java EE	Corresponding event (when using the database session failover functionality)	Listener that operates
1	Creating an HTTP session	Creating an HTTP session	The `sessionCreated()` method in the `javax.servlet.http.HttpSessionListener` interface
2	Disabling an HTTP session	Disabling an HTTP session Stopping a Web application	The `sessionDestroyed()` method in the `javax.servlet.http.HttpSessionListener` interface The `attributeRemoved()` method in the `javax.servlet.http.HttpSessionAttributeListener` interface^# The `valueUnbound()` method in the `javax.servlet.http.HttpSessionBindingListener` interface^#
3	Adding HTTP session attributes	Adding HTTP session attributes	The `attributeAdded()` method in the `javax.servlet.http.HttpSessionAttributeListene`r interface The `valueBound()` method in the `javax.servlet.http.HttpSessionBindingListene`r interface
4	Changing HTTP session attributes	Changing HTTP session attributes	The `aattributeReplaced()` method in the `javax.servlet.http.HttpSessionAttributeListener` interface
5	Deleting HTTP session attributes	Deleting HTTP session attributes Stopping a Web application	The `attributeRemoved()` method in the `javax.servlet.http.HttpSessionAttributeListener` interface The `valueUnbound()` method in the `javax.servlet.http.HttpSessionBindingListener` interface
6	Activating a session	Inheriting global session	The `sessionDidActivate()` method in the `javax.servlet.http.HttpSessionActivationListener` interface
7	Deactivating a session	(no corresponding event)	(No listener operates)

# Case when attributes were added when the event occurred.

Other listeners operate in the same way as cases in which the database session failover functionality is not used.

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