Middleware Basics

3/2/2008 Varun Arora @ SICSR M.Sc.(CA)2007-’09 1

Middleware

By:

Varun Arora

varorain@yahoo.co.in

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

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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.

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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.

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Middleware – Use

API

Middleware (Distributed System Services)

PlatformOS

Application Application

Platform interface Platform interface

PlatformOS

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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.

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Middleware - Use

Be reliable and available. Scale-up in capacity without losing function.

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Middleware – Different Forms

Transaction Processing (TP) monitors. Remote Procedure Calls (RPC) Message Oriented Middleware (MOM) Object Request Brokers (ORBs)

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TP Monitors - Demonstration

Client Transaction Type Requests

Database

Processing Routines

Client

Client

Client

Client

Client

TransactionProcessing

Monitor

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RPC - Demonstration

TRANSPORT

NETWORK

NETWORK

TRANSPORT

RPC Stub

RPC Stub

Application

ApplicationServer

Application specificprocedure invocations

and returns

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ORB - Demonstration

Client Application Remote Service(Object)

ORB

Locate service Activate service

communicate

Establishconnection

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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.

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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.

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MOM - Demonstration

Queue

MOM Provider

APPLICATION

MOM

API

TRANSPORT

NETWORK

APPLICATION

MOM

API

TRANSPORT

NETWORK

Message Message

Application A(Client A)

Application B(Client B)

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MOM - Advantages

Asynchronous Flexible Portability Interoperability Reduces Complexity

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MOM - Products

IBM Websphere MQ Series Sonic MQ MS MQ Java Message Queue

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MOM - Architectural SignificanceMainframe

Database

Transaction

J2EE Application

Middle Layer

Listener

Listener

Message

Message

Message

MessageMessage

Process C

Process B

Process A

APPLICATION

1

2 3

4

5 67

8

0

9

C

B

AQ1 Q2

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Queries??

Thank You!!