The base application, with its 3270 user interface, provides
functions with which you can list the contents of a stored catalog,
select an item from the list, and enter a quantity to order. The application
has a modular design, which makes it simple to extend the application
to support newer technology, such as web services.
Figure 1 shows the structure
of the base application.Figure 1. Structure of the base
application
The components of the base application are:
A BMS presentation manager (DFH0XGUI) that supports a 3270 terminal
or emulator, and that interacts with the main catalog manager program.
A catalog manager program (DFH0XCMN) that is the core of the example
application, and that interacts with several back-end components:
A data handler program that provides the interface between the
catalog manager program and the data store. The base application provides
two versions of this program. They are the VSAM data handler program
(DFH0XVDS), which stores data in a VSAM data set; and a dummy data
handler (DFH0XSDS), which does not store data, but returns valid
responses to its caller. Configuration options let you choose between
the two programs.
A dispatch manager program that provides an interface for dispatching
an order to a customer. Again, configuration options let you choose
between the two versions of this program: DFHX0WOD is a web service
requester that invokes a remote order dispatch end point, and DFHX0SOD
is a dummy program that returns valid responses to its caller.
There
are two equivalent order dispatch endpoints: DFH0XODE is a CICS service
provider program; ExampleAppDispatchOrder.ear is
an enterprise archive that can be deployed in WebSphere Application
Server or similar environments.
A dummy stock manager program (DFH0XSSM) that returns valid responses
to its caller, but takes no other action.
