What Is the Role of the Bulletin Board and Bulletin Board Liaison?


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The bulletin board (BB) is a memory segment in which all the application configuration and dynamic processing information is held at run time. It provides the following functionality:

Assigns service requests to specific servers. When a service is called, the bulletin board looks up servers that offer the requested service. Based on this information, and any data-dependent routing criteria, the bulletin board places the request data on the request queue of a valid server.
Maintains dynamic information about the state of an application, such as how many requests are waiting on a given server's queue and how many requests have been processed.
Provides server location transparency, allowing an application to be developed independently of deployment. Therefore, development and deployment costs are minimized.
Supports service name aliases, allowing multiple names to be assigned to the same service. This capability is useful for constructing interpreters, such as gateways.

The Bulletin Board Liaison (BBL) is a BEA Tuxedo server that performs periodic health checks of the bulletin board and coordinates functions of all parts of the system.

Bulletin Board and Bulletin Board Liaison