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Enterprise Service BUS
Large IT organizations increasingly face the challenge of
integrating various web services, applications, and other
technologies into a single network. The solution to finding
a meaningful large-scale architecture that is capable of
spanning a global enterprise appears to have been met in
ESB, or Enterprise Service Bus. Rather
than conform to the
hub-and-spoke architecture of traditional enterprise
application integration products, ESB provides a highly
distributed approach to integration, with unique
capabilities that allow individual departments or business
units to build out their integration projects in
incremental, digestible chunks, maintaining their own local
control and autonomy, while still being able to connect
together each integration project into a larger, more global
integration fabric, or grid.
Enterprise Service Bus offers a thorough introduction and
overview for systems architects, system integrators,
technical project leads, and CTO/CIO level managers who need
to understand, assess, and evaluate this new approach.
Written by Dave Chappell, one of the best known and
authoritative voices in the field of enterprise middleware
and standards-based integration, the book drills down into
the technical details of the major components of ESB,
showing how it can utilize an event-driven SOA to bring a
variety of enterprise applications and services built on
J2EE, .NET, C/C++, and other legacy environments into the
reach of the everyday IT professional.
With Enterprise Service Bus, readers become well versed in
the problems faced by IT organizations today, gaining an
understanding of how current technology deficiencies impact
business issues. Through the study of real-world use cases
and integration patterns drawn from several industries using
ESB--including Telcos, financial services, retail, B2B
exchanges, energy, manufacturing, and more--the book clearly
and coherently outlines the benefits of moving toward this
integration strategy. The book also compares ESB to other
integration architectures, contrasting their inherent
strengths and limitations.
If you are charged with understanding, assessing, or
implementing an integration architecture, Enterprise Service
Bus will provide the straightforward information you need to
draw your conclusions about this important disruptive
technology.
Foreword
Preface
1. Introduction to the Enterprise Service Bus
SOA in an Event-Driven Enterprise
A New Approach to Pervasive Integration
SOA for Web Services, Available Today
Conventional Integration Approaches
Requirements Driven by IT Needs
Industry Traction
Characteristics of an ESB
Adoption of ESB by Industry
2. The State of Integration
Business Drivers Motivating Integration
The Current State of Enterprise Integration
Leveraging Best Practices from EAI and SOA
Refactoring to an ESB
3. Necessity Is the Mother of Invention
The Evolution of the ESB
The ESB in Global Manufacturing
Finding the Edge of the Extended Enterprise
Standards-Based Integration
Case Study: Manufacturing
4. XML: The Foundation for Business Data Integration
The Language of Integration
Applications Bend, but Don't Break
Content-Based Routing and Transformation
A Generic Data Exchange Architecture
5. Message Oriented Middleware (MOM)
Tightly Coupled Versus Loosely Coupled Interfaces
MOM Concepts
Asynchronous Reliability
Reliable Messaging Models
Transacted Messages
The Request/Reply Messaging Pattern
Messaging Standards
6. Service Containers and Abstract Endpoints
SOA Through Abstract Endpoints
Messaging and Connectivity at the Core
Diverse Connection Choices
Diagramming Notations
Independently Deployable Integration Services
The ESB Service Container
Service Containers, Application Servers, and Integration Brokers
7. ESB Service Invocations, Routing, and SOA
Find, Bind, and Invoke
ESB Service Invocation
Itinerary-Based Routing: Highly Distributed SOA
Content-Based Routing (CBR)
Service Reusability
Specialized Services of the ESB
8. Protocols, Messaging, Custom Adapters, and Services
The ESB MOM Core
A Generic Message Invocation Framework
Case Study: Partner Integration
9. Batch Transfer Latency
Drawbacks of ETL
The Typical Solution: Overbloat the Inventory
Case Study: Migrating Toward Real-Time Integration
10. Java Components in an ESB
Java Business Integration (JBI)
The J2EE Connector Architecture (JCA)
Java Management eXtensions (JMX)
11. ESB Integration Patterns and Recurring Design Solutions
The VETO Pattern
The Two-Step XRef Pattern
Portal Server Integration Patterns
The Forward Cache Integration Pattern
Federated Query Patterns
12. ESB and the Evolution of Web Services
Composability Among Specifications
Summary of WS-* Specifications
Adopting the WS-* Specifications in an ESB
Conclusion
Appendix: List of ESB Vendors
Bibliography
Index
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