The document defines middleware as software that allows processes running on different machines to interact. It discusses different types of middleware including transaction processing monitors, remote procedure calls, message oriented middleware, and object request brokers. Message oriented middleware is highlighted as a type that uses message passing to enable asynchronous and reliable communication between distributed applications.

1. Middleware By: Varun Arora [email_address] www.varunarora.in 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09

2. Table of Contents Middleware Use Middleware Types Message Oriented Middleware Advantages Products Architectural Significance 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09

3. Middleware - Definition Middleware is connectivity software that consists of a set of enabling services that allow multiple processes running on one or more machines to interact with each other. 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09

4. Middleware – Technical Detail Middleware services are sets of distributed software that exist between the application and the operating system and network services on a system node in the network. 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09

5. Middleware – Use 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09 API Middleware (Distributed System Services) Platform OS Platform interface Platform interface Platform OS Application Application

6. Middleware - Use Middleware services provide a more functional set of API than OS and network services to allow an application to – Locate transparently across the network, providing interaction with other application or service Be independent from network services. 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09

7. Middleware - Use Be reliable and available. Scale-up in capacity without losing function. 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09

8. Middleware – Different Forms Transaction Processing (TP) monitors. Remote Procedure Calls (RPC) Message Oriented Middleware (MOM) Object Request Brokers (ORBs) 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09

9. TP Monitors - Demonstration 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09 Client Transaction Type Requests Database Processing Routines Client Client Client Client Client Transaction Processing Monitor

10. RPC - Demonstration 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09 T R A N S P O R T N E T W O R K N E T W O R K T R A N S P O R T RPC Stub RPC Stub Application Application Server Application specific procedure invocations and returns

11. ORB - Demonstration 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09 Client Application Remote Service (Object) ORB Locate service Activate service communicate Establish connection

12. Message Oriented Middleware MOM (Message Oriented Middleware) is a client / server infrastructure which allows the application to be distributed over multiple heterogeneous platforms. Reduces complexity of applications spanning operating systems and network protocols by insulating them from un-necessary details. 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09

13. Message Oriented Middleware Data is exchanged by message passing and/or message queuing supporting both synchronous and asynchronous interactions between distributed computing processes. The MOM system ensures message delivery by using reliable queues and by providing the directory, security, and administrative services required to support messaging. 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09

14. MOM - Demonstration 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09 Queue MOM Provider Message Message Application A (Client A) Application B (Client B) A P P L I C A T I O N M O M A P I T R A N S P O R T N E T W O R K A P P L I C A T I O N M O M A P I T R A N S P O R T N E T W O R K

15. MOM - Advantages Asynchronous Flexible Portability Interoperability Reduces Complexity 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09

16. MOM - Products IBM Websphere MQ Series Sonic MQ MS MQ Java Message Queue 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09

17. MOM - Architectural Significance 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09 Mainframe Database Transaction J2EE Application Middle Layer Listener Listener Message Message Message Message Message Process C Process B Process A A P P L I C A T I O N 1 2 3 4 5 6 7 8 0 9 C B A Q1 Q2

18. Queries?? Thank You!! 3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09