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Application Migration and Development Guide
Application Development with PAS for OpenEdge : PAS for OpenEdge and Client Interaction : Choosing the application model : Session-free model
Session-free model
The session-free model is specifically designed for business applications or SOAP Web services that return a complete result, starting and ending any transactions, in a single request. Thus, the server maintains no context for any client that it services. Requests from a session-free client are handled by any available ABL session in any available multi-session agent that supports the required business application. The session-free client (or the session-free SOAP Web service on behalf of a SOAP Web service client) has each of its server requests executed by an available ABL session chosen by the PAS for OpenEdge session manager from its pool of ABL sessions.. Thus, PAS for OE executes requests from all session-free clients as it receives them, and completes each request independently of any prior request.
In this application model, all requests from a single client are multi-threaded, meaning that multiple requests from a single client can be executed in parallel, as PAS for OE resources permit. The more ABL sessions that are available to handle requests for a given business application (or SOAP Web service), the more requests that the application or SOAP Web service can handle simultaneously from a single client. Each PAS for OE instance executes requests as fast as communications and server agent resources permit. Thus, the same client can have multiple requests executed by an application server at one time, and each application server can execute requests from any number of clients at one time, both limited by the number of ABL sessions and multi-session agents configured for each application server.