UNDERSTANDING THE COMPONENT OF SAP R/3 ARCHITECTURE

ABAP+Java System Architecture

1. Message Server :It handles communication between distributed Dispatchers in ABAP system.
2. Dispatcher Queue: Various workprocess types are stored in this queue.
3. Dispatcher: It distributes requests to the workprocesses.
4. Gateway :It enables communication between SAP system and between SAP system and external systems.
5. ABAP-Workprocesses:- It separately executes dialog steps in R/3 applications.

Types of workprocesses are given as below:-

6. Memory-pipes: It enables communication between ICM and ABAP workprocesses.
7. Message Server: It handles java dispatchers and server processes.It enables communication within java runtime environment.
8. Enqueue Server:It handles logical locks that are set by the executed Java application program in a server process.
9. Central Services:Java cluster requires a special instance of the central services for managing locks and transmitting messages and data. Java cluster is a set of processes that work together to build reliable system. Instance is group of resources such as memory, work processes and so on.
10. Java Dispatcher: It receives the client requests and forwards to the server process.
11. SDM: Software Deployment Manager is used to install J2EE components.
12. Java Server Processes: It can processes a large number of requests simultaneously.
13. Threading: Multiple Processes executes separately in the background , this concept is called threading. 14. ICM: It enables communication between SAP system and HTTP,HTTPS,SMTP protocol. It means by entering system URL in the browser you can access SAP from browser also.