Introduction to Networking for NonStop S-Series Servers

Application Programming With Communications
Products
Introduction to Networking for HP NonStop S-Series Servers—520670-005
3-6
Application Architecture Examples
Figure 3-3 on page 3-7 illustrates two related securities applications:
•
A cooperative processing application to retrieve stock quotes from a wire service
and maintain an SQL database of stock prices on the NonStop S-series server.
•
A trading application in which personal computers (PCs) emulate HP terminals for
access to a Pathway application. The same PCs also emulate IBM 3270 terminals,
so system managers can monitor the status of batch operations on the IBM host.
Account and portfolio information is maintained in an SQL database on the
NonStop S-series server.
The trading application requires no communications programming. The NonStop
Transmission Control Protocol/Internet Protocol (NonStop TCP/IP) product and the
TELNET application (which implements the NonStop TCP/IP network terminal
protocol), along with the corresponding software and the 6530 emulators on the PCs,
allow the Pathway application to support the PCs transparently. Likewise, the EM3270
emulator on the NonStop S-series server provides for transparent communication with
the IBM host. The cooperative processing application requires one communications
programming task on the NonStop S-series server: an application using the sockets
interface of NonStop TCP/IP to communicate with a companion application on the
workstation that receives the stock quotes. (The same application also performs
database functions.)