This document discusses using an Enterprise Service Bus (ESB) to integrate legacy systems into a Service Oriented Architecture (SOA). An ESB provides an infrastructure to build composite applications by acting as "glue" between systems. It abstracts the underlying enterprise messaging system and supports multiple integration strategies. Some key ESB characteristics that help with integration include streamlining development, performing data transformation, intelligent routing, monitoring, exception handling, and security. The document assigns discussing the process of enterprise-wide integration of legacy systems to an SOA using an ESB.

1. Service Oriented Architecture: 23
Enterprise Integration through ESB
Prof Neeraj Bhargava
Vaibhav Khanna
Department of Computer Science
School of Engineering and Systems Sciences
Maharshi Dayanand Saraswati University Ajmer

2. 2
Legacy Business Process
Business Process 1
Business Process 2
Business Process 3

3. 3
Architectural Choke Point
• Monolithic
• Extremely complex
• Very tightly coupled
• Difficult to find clean integration points
• Lack of standards makes it difficult to
integrate
• Rigid architecture makes even small
changes complex and costly

4. 4
SOA Business Process
Business Process
Shared Service
Information Framework
Supplier

5. How Do You Build a Service-
Oriented Architecture Solution?

6. 6
IT Infrastructure is an Ecosystem
• COBOL
• C++
• Java
• J2EE
• Networks
• TCP/IP
• Web Service
• Mid-Tier Servers
• .NET
• Messaging
• HTML
• Operating Systems
• CICS
• Routers
• Databases
• Mainframes

7. 7
Managing the Ecosystem
Technology Management
• Product duplication
• Standards
• Product/Vendor lock-in
• Support skill sets
Version Management
• Managed
Evergreening
• Limited versions in
production

8. 8
Legacy Integration

9. 9
SOA Integration
SOA Architecture

10. 10
Integration Stack
• Industry Standards
• Language
Standards
• Custom API’s
• Native Interfaces
Ubiquity
Proprietary

11. 11
What is an Enterprise Service Bus
(ESB)?
• An enterprise service bus is an infrastructure used for
building compound applications
• The enterprise service bus is the glue that holds the
compound application together
• The enterprise service bus is an emerging style for
integrating enterprise applications in an
implementation-independent fashion
• An enterprise service bus can be thought of as an
abstraction layer on top of an Enterprise Messaging
System

12. 12
Key Characteristics of an ESB
• Streamlines development
• Supports multiple binding strategies
• Performs data transformation
• Intelligent routing
• Real time monitoring
• Exception handling
• Service security

13. Assignment
• Discuss the process of Enterprise wide
integration of the legacy systems to a Service
oriented Architecture using ESB
• Thank You