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ENTERPRISE SERVICE BUS

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Goals Introduction to Enterprise Service Bus (ESB)

What is an ESB ?

Evolution of ESB

Features Of ESB

Role of ESB in Services Oriented Architecture

(SOA)Key Advantages & Disadvantages Of ESB

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Step to Understanding ESB Concept

Review Key SOA terms and Concept

Enterprise Service Bus Description

Definition And Scope of ESB How ESB Software Works

Key Characteristic and Benefits SOA Without ESB

SOA With ESB ESB Value Proposition

Role of ESB

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WHAT IS ESB ?y Enterprise Service Bus is the Methodology to provide the

Integration to the different Services. Here Services means any

component which is providing some functionality to the

Clients. ESB provides the Base for all those Services to interact

with each other.

y An enterprise service bus (ESB) is a pattern of middleware that

unifies and connects services, applications and resources within

a business. Put another way, it is the framework within whichthe capabilities of a business' applications are made available

for reuse by other applications throughout the organization and

beyond.

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Definitions And Scope Of ESB

y In computing, an enterprise service bus (ESB) consists of a softwarearchitecture construct which provides fundamental services forcomplex architectures via an event-driven and standards -basedmessaging-engine (the bus). Developers typically implement an ESB

using technologies found in a category of middleware infrastructureproducts, usually based on recognized standards.

y An ESB generally provides an abstraction layer on top of animplementation of an enterprise messaging system , whichallows integration architects to exploit the value of messaging

without writing code. Unlike the more classical enterpriseapplication integration (EAI) approach of a monolithic stack in ahub and spoke architecture, an enterprise service bus builds onbase functions broken up into their constituent parts, withdistributed deployment where needed, working in harmony asnecessary.

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Service Oriented Architecture (SOA)Definition Of Some Key Terms

. A Service?A Repeatable

Customer Task For Exp CheckCustomer Credit ; Open aNew Account;

.Service Oriented Architecture (SOA) ?

An IT

Architectural Style ThatSupports ServiceOrientation.

.Service Orientation?

A Way of

Integrating Your Business AsLinked Services And TheOutcomes That They Bring.

.A CompositionApplication ?

A Set Of RelatedAnd Integrated ServiceThat Support A BusinessProcess Built On AnSOA.

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Basic SOA

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What is an Enterprise Service Bus?An Enterprise Service Bus(ESB) isan Flexible Connectivity Infrastructure

for Integrating Application And Services.

An ESB Powers Your SOA By Reducing the Number, Size And Complexityo f Interface.

An ESB Performs Following Between

Requestor And Service

Routing Messages BetweenService.

Converting TransportProtocols Between Request

And Service Transforming Message

Formats Between RequestorAnd Service

Handling Business EventsFrom Disparate Source.

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Leverage the SOA Reference Architecture

Interaction Services Information

Partner Services Business App Services Access Services

Development

Services

Management

Services

Infrastructure Services

Enables collaboration

between people, processes &

information

Manages diverse data and

content in a unified

manner

Connect with trading

partners

Build on a robust,

scaleable, and secure

services environment

Facilitate interactions with

existing information and

application assets

Integrated

environmentfor design and

creation of

solution assets

Manage andsecure

services,

applications &

resources

Optimizes throughput, availability and utilization

Apps&

InfoAssets

Process Services

Business ServicesSupports enterprise business process andgoals through businesses functional service

Enterprise Service Bus

Orchestrate and automate

business processes

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Interaction Services Information Services

Partner Services Business App Services Access Services

Development

Services

Management

Services

Infrastructure Services

Enables collaboration

between people, processes &

information

Manages diverse data and

content in a unified

manner

Connect with trading

partners

Build on a robust,

scaleable, and secure

services environment

Facilitate interactions with

existing information and

application assets

Integrated

environment

for design and

creation of

solution assets

Manage and

secure

services,

applications &

resources

Optimizes throughput, availability and utilization

Apps&

I

nfoAssets

Process Services

Business ServicesSupports enterprise business process and

goals through businesses functional service

Enterprise Service Bus

Orchestrate and automate

business processes

Supporting Products

WebSphereESB

WebSphereData Power

WebSphereService

Registry &Repository

WebSphereMessageBroker

WebSphereTransformation

Extender

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EVOLUTION OF ESBy Enterprise Service Bus concept started off life in the mid

90s it was as an extension of a messaging pipe - that is,message based communications.

y ESB concepts emerged majorly in 1996-97y Standards activity in the integration marketplace increased

and took root, and users wanted to find ways to lower theentry price for integration - having to buy a hub was veryexpensive, particularly when connections were few in theearly stages of integration development. There were alsofairly groundless concerns about availability with the huband spoke model due to the perceived single point offailure. As a result, the ESB emerged

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FEATURES OF ESBy Invocation - support for synchronous and asynchronous transport protocols,

service mapping (locating and binding).

y Routing - addressability, static/deterministic routing, content-based routing,

rules-based routing, policy-based routing.y Mediation - adapters, protocol transformation, service mapping.

y Messaging - message-processing, message transformation and messageenhancement.

y Process choreography - implementation of complex business processes

y Service orchestration - coordination of multiple implementation services

exposed as a single, aggregate service.

y Complex event processing - event-interpretation, correlation, pattern-matching.

y Management - monitoring, audit, logging, metering, admin console.

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Inaddition,an ESB is expected to exhibit thefollowing

characteristics:y general use of XML as the standard communication language

y support for web-services standards

y validation against schemas for sending and receiving messages

y the ability to apply business rules uniformly

y enriching messages from other sources

y the splitting and combining of multiple messages and the

handling of exceptions

y the provision of a unified abstraction across multiple layers

y queuing, holding messages if applications temporarily become

unavailable

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ROLE OF ESB IN SOAy SOA is a service oriented Architecture, means we are developing

the business logic as a service to finish small task.

y SOA is a way of architecting your IT programs around a service-oriented concept

y The absolute key to this is that an SOA service relates to aBUSINESS piece of functionality as opposed to someprogramming activity

y

Therefore, it is clear to see that SOA requires some sort ofcommunications capability, and while this does not have to be anESB, the ESB fits the role very well particularly with its affinity tostandards such as web services.

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ROLE OF ESB IN SOAyAn ESB does not itself implement a service-oriented

architecture (SOA) but provides the features with

which one may implement such.y ESBs attempt to isolate the coupling between the

service called and the transport medium. Most ESBproviders incorporate SOA principles and allow for

independent message formats.yAnd ESB is not essential for a SOA, but it is very

helpful

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SOA Without ESBDecouples Interface FromApplication

Rich BusinessAbstractive

Describe the

Application Interface

Decouples the

Interface From

The BusinessApplication

The Number AndComplexity Of

The Interface

Is Reduced

BusinessApplication

And Other

Interface BecomeReusable.

But Interfaces Tightly Coupled With Point To Point Connection

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SOA With ESBDecouple Interface From Point To Point Connections

Decouples The PointTo Point Connection

From The Interface.

Allows For DynamicSelection

Substitution AndMatching

Enable More FlexibleCoupling And

Decoupling Of TheApplications.

Enables You To FindBoth The Application

And The InterfaceFor Reuse.

ResultGreat Business Responsiveness

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BENEFITS OF ESBy Today's fast-paced business world demands the ability to

change and adapt rapidly. An enterprise service bus can enable

you to integrate your business applications and processes

quickly and easily, allowing you to respond to business

challenges and opportunities as soon as they arise.

y The ESB pattern can improve operational performance and

reduce costs while simplifying the task of connecting dissimilar

applications across a network of different operating systems.

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BENEFITS OF ESBy An enterprise service bus (ESB) enables a business to make

use of a comprehensive, flexible and consistent approach tointegration while also reducing the complexity of the

applications being integrated. Due to the complex andvarying nature of business needs, ESB is an evolutionalprogression that unifies message oriented, event driven andservice oriented approaches for integrating applicationsand service. Implementing an ESB facilitates greater reuseof IT assets by separating application logics and integration

tasks, so you can reduce the number, size, and complexityof integration interfaces. In doing so, you can add orchange services with minimal interruption to existing ITenvironment; reduce cost and risk involved as businesschanges and new opportunities arise.

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BENEFITS OF ESBy The benefit of an ESB is that it eases the process of creating an

SOA.

y Within the boundaries of an ESB, support for multiple

protocols and data transformation enables heterogeneous

services to behave as if they were homogeneousy The support for reliable and secure messaging and queuing is

also available through straight-forward configuration rather

than coding

yAdd in the availability of logging and access control forgovernance and ESB can be a very useful tool indeed

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BENEFITS OF ESBy Faster and cheaper accommodation of existing systems.

y Increased flexibility; easier to change as requirements change.

yStandards-based

y Scales from point-solutions to enterprise-wide deployment

(distributed bus).

y Predefined ready-for-use service types.

yMore configuration rather than integration coding.

y No central rules-engine, no central broker.

y Incremental patching with zero down-time; enterprise becomes

"refactorable

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All customer services communicate in the same way with the ESB: the ESB

translates a message to the correct message type and sends the message to the

correct producer service.

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Potential IT Benefits:y

Create additional value from existing applications andinformation

y Quickly add best-of-breed applications

y Reduce the total cost of ownership through a standards based

service-oriented architecture (SOA)y Quickly respond to changing value-chain requirements

y Leverage existing assets in new ways

y Simplify complex programming tasks

yReduce software development and maintenance cost

y Improve system security, scalability, availability and robustness

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Potential Business Benefits :y

Improve customer service and business agilityy Lower operating costs

y Access real time business information accurately and rapidly

y Accelerate mergers and acquisitions

y Lower inventory costsy Improve return on assets

y Eliminate manual process errors

y Improve and automate value-chain management

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The key advantages of using an ESB are less about

features and functions and more about how you use it.

y Standardization

y Loose Coupling

y Scalability and Reliability

yRouting and mediation

y Complex message exchange patterns

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Key Benefits & Disadvantages Of ESB Advantages OF ESB

Faster and cheaper accommodation ofexisting systems.

Increased flexibility; easier to changeas requirements change.

Standards-based

Scales from point-solutions toenterprise-wide deployment(distributed bus).

More configuration rather thanintegration coding.

Incremental Patching with zero down-time; enterprise becomes refactorable

Disadvantages OF ESB

Usually requires an Enterprise MessageModel, resulting in additionalmanagement overhead.

Requires ongoing management of messageversions to ensure the intended benefit ofloose coupling. Incorrect, insuff icient, orincomplete management of messageversions can result in tight couplinginstead of the intended loose coupling.

It normally requires more hardware thansimple point-to-point messaging.

Though ESB systems can require asignificant effort to implement, theyproduce no commercial value without thesubsequent development of SOA servicesfor the ESB

Middleware analysis skills needed toconfigure, manage, and operate an ESB.

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ESB Value PropositionFocus On Your Core Business Not Your IT

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Industry analysts confirm multiple

ESB futureESB Adoption Trends - Gartner

80% of large companies will have ESBs or similar SOA infrastructure

products from three or more vendors in 2009. (0.7 probability)

half of all large companies will apply a systematic, federated approach

to managing their disparate SOA domains and ESBs in 2009. (0.7probability)

RoySchulte, Gartner, Succeeding With Multiple SOA Service Domains and Disparate ESBs, May 2007

ESB Adoption Trends - Forrester

Some of Forrester's most advanced clients got on the ESB bandwagonyears ago and today find that they have an embarrassment of riches, with

multiple ESBs. This outcome is almost inevitable for larger enterprises; no

single ESB today can satisfy all requirements equally well across the

whole of a large enterprise.

Larry Fulton, Forrester, Shaping Your Middleware Strategy to Benefit from ESBs, May 2007

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SOURC

ESy EBIZQ.NET

y WIKIPEDIA

y IBM.COMy SOABLOKE.COM

y JAVABEAT.COM

*******Thank You*******

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