The SAP NetWeaver Application Server is the central foundation for the entire SAP which is present in application layer (business server) in three tier architecture. Application Server is responsible for interpreting the ABAP programs. It cotains several executable programs and every program will start automatically when an Application Sever started.
Technical Components
An SAP system consists of several application server instances, as well as one or more databases.
In addition to the whatever number of dialog instances users choose to execute, there is one central instance that contains the message server and the enqueue server. It cannot process any dialog requests.
A dialog instance consists of the following components:
· The Internet Communication Manager (ICM) sets up the connection to the Internet. It can process both server and client Web requests.It supports the protocols HTTP, HTTPS, and SMTP. The SAP Web AS may be a Web server or a client (see SAP Web Application Server: Web Server or Web Client)
· The dispatcher distributes the requests to the work processes. If all the processes are occupied the requests are stored in the dispatcher queue.
· The Work Processes execute ABAP or Java programs.
· The SAP Gateway makes the RFC interface between the SAP instances available (within an SAP System and beyond system boundaries).
· The Message Server exchanges messages and balances the load in the SAP system.
· In the J2EE component of the SAP NetWeaver AS there are also components Java Dispatcher, Server Process and Software Deployment Manager For more information see Java Cluster Architecture.
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