Release 10.1A: OpenEdge Application Server:
Developing AppServer Applications

Understanding AppServer operating modes

When you configure an AppServer, you specify an operating mode that indicates how the AppServer broker manages its AppServer agent pool and assigns client requests to AppServer agents within the pool. The choice of operating mode has a potentially major affect on the performance and design of your AppServer application, including both the procedures that run on the AppServer and your client application.

Any Progress® 4GL procedure running on the AppServer can determine the operating mode it is running on by reading the value of the SERVER-OPERATING-MODE attribute on the SESSION system handle. This is a CHARACTER parameter that returns the name of the operating mode as a string:

"STATE-RESET"
"STATE-AWARE"
"STATELESS"
"STATE-FREE"

The following sections describe these operating modes in detail.

For information on the AppServer architecture and an overview of AppServer operating modes, see OpenEdge Getting Started: Application and Integration Services . For information on how to configure the operating mode for an AppServer instance, see OpenEdge Application Server: Administration .