Compaq Reliable Transaction Router - Manual (Page 37)

RTR Facilities Bridge the Gap
RTR Facilities Bridge the Gap
Many applications can use RTR at the same time without
interfering with one another. This is achieved by defining a
separate facility for each application.
When an application calls the rtr_open_channel( ) routine to
declare a channel as a client or server, it specifies the name of
the facility it will use.
See the RTR System Manager’s Manual for information on how
to define facilities.
Broadcasts
Sometimes an application has a requirement to send unsolicited
messages to multiple recipients.
An example of such an application is a commodity trading
system, where the clients submit orders and also need to be
informed of the latest price changes.
The RTR broadcast capability meets this requirement.
Recipients subscribe to a class of broadcasts; a sender broadcasts
a message in this class, all interested recipients receive the
message.
RTR permits clients to broadcast messages to one or more
servers, or servers to broadcast to one or more clients. If a server
needs to broadcast a message to another server, it must open a
second channel as a client.
Flexibility and Growth
RTR allows you to cope easily with changes in:
• Network demand
Architectural Concepts 2–3