user manual

64 BES Developer’s Guide
Session management with JSS
In the diagram, “JSS Management with a Centralized JSS and Two Web
Containers” on page 64, there are four virtual machines:
■
The first machine hosts the Apache web server,
■
two other machines contain an instance of the Borland web container,
■
and the fourth machine hosts the JSS and relational database (JDataStore
or a JDBC datasource).
If an interruption occurs between the Apache web server (Machine 1) which is
passing a client request to the first web container instance (Machine 2), then
the second web container instance (Machine 3) can continue processing the
client request by retrieving the session information from the JSS (Machine 4).
The items in the Shopping Cart are retained and the client request continues
to be processed.
Figure 6.1 JSS Management with a Centralized JSS and Two Web Containers
In the diagram, “JSS Management with Two Web Containers and a
Centralized Backend Datastore” on page 66, are the following four virtual
machines: