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SOA and EDA

Thoughts onService Oriented Architecture and Event-Driven Architecture

- and more -

DisclaimerThis is a personal weblog - The opinions expressed here represent my own and not those of my

employer

Friday, August 24, 2007

What is EAI?

What is Enterprise Application Integration or EAI? Application Integration isironically about application division. This article explains how applications are

divided into separated components and how the components are glued together.

Several glue-areas are recognized where mashups, portals, shared databases,

SOA and EDA all play a role in gluing the pieces together.

In this article several steps are described to finally reach the integrated

application. These steps however are not meant as a logical sequence. In

practice these steps will evolve concurrently over time, led by architectural

directions and roadmaps.

Let us start with the chaos.

Context

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Many current application landscapes consist of an organically grown collection of

monolithic applications that interact by many different application- and

technology-specific interfaces. All these applications have their own

implementations of access control, user interfacing, persistency and business

process control. Interface control is merged with business rules within thedifferent applications, representing the overall business processes.

This leads to:

Complex and long lasting maintenance efforts

Data inconsistency

Error-prone interface maintenance because of many (sometimes unknown)

dependencies

Exponential growth of complexity when extending the system

In the current age where the pace of minor and major business-changes

accelerates quickly to comply with global demands and where business more

and more will be implemented and performed by IT, such an application

landscape will not suffice anymore.

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What is one thing we can do to bring order in the chaos? The answer is: strip the

applications down to core business rules implementations by externalizing

shared areas for exchange, access and persistency.

Externalize shared Exchange Areafrom applications

Bringing the interface control outside the application into a shared facility to be

used by all applications results in uniformity of message exchange. Generic data

transformation and routing services offer a layer of indirection between the

communicating applications, which makes the applications less dependent on

knowledge of each others data formats, technologies, addressing and location. In

this layer generic facilities may be implemented to secure data transport in a

standards based and sophisticated way, without any impact on the applications

themselves.

Another huge advantage is that (changes of) process definitions can be

accomplished much easier. Business processes that involve more than one

application are established in the interface control mechanisms. Taking these

mechanisms outside the applications allows for a more flexible configurable

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solution. This principle, combined with a design style to break down the business

logic within an application into well defined components is the basis for BPM

(Business Process Management).

The effects of externalizing an exchange area are:

Less maintenance efforts

More speed and flexibility in changing business processes

Uniformity of management

Linear growth of complexity when extending the system

Services at a shared external exchange area brings applications together at the

business logic layer.

Externalize shared Access Areafrom applications

Bringing user interface and access control from the individual applications to a

generic facility makes the application:

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Independent from user devices

Independent from user location

Independent from user interface

Independent from application access control

Generic services can establish single sign-on, customized house-style

decorations, remote access, personalization (language, time-zone, preferences).

This leads to:

Less maintenance efforts when changing overall presentation

Uniformity and consistency of presentation

Services at a shared external access area brings applications together at the

user interface layer.

Externalize shared Persistency Areafrom applications

This externalization principle is very common for decades already: get all the fine

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grained data persistency logic out of the application and use shared database

services. The persistency area offers services for:

Virtualization

Real-time data synchronization Data warehouses

Recovery

Meta data management

Some of the benefits are:

Data more actual (real-time synchronization)

Consistency of data (synchronization, data warehouse)

Less database management (recovery, meta model)

Services at a shared external persistency area brings applications together at the

data layer.

Virtual one single integrated application

Externalizing these three shared areas from the applications leaves a fourth area

where the implementation of business logic resides. Business logic may be

implemented by ERP, COTS, custom code and legacy. These concrete ways todeliver business logic dont exclude each other, but overlap (e.g. the greater part

of legacy will mostly be custom code).

Finally this architectural design leads to virtual one big integrated enterprise

application.

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Once in place, opportunities grow. In

particular the exchange area is interesting. When business logic implementations

are broken down to adequately sized and designed components, the exchange

area will enable standards based BPM, BAM and CEP:

Business Process Management: Flexible business processdefinition/maintenance

Business Activity Monitoring: Real-time view on operational business state

Event processing: React proactively to potential bottlenecks; correlate

detected events to generate new events

The exchange area will allow for BPM, BAM and CEP to make use of standards

based access services and standards based persistency services in the context

of SOA and EDA.

Mashups: integration at the client side

There is however one more aspect to application integration at the user interface

layer. And that is the clients. Portals facilitate integration at the server side. At the

client side (e.g. the web browser) new technologies are introduced based on

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Javascript and AJAX. Integration at the client side of the user interface are called

a mashup. Mashups bring applications together in the browser while portals bring

applications together with the help of portlets on the server.

The glue

The externalized areas can all be characterized as Enterprise Application

Integration, each of which is very different from the other in nature. The areas

each offer their own kind of services to glue the components together.

The multiple faces of Enterprise Application Integration recapitulated:

Integration at the data layer: the glue is shared databases, DBMS, data

warehouse

Integration at the business logic layer : the glue is ESB, SOA, EDA

Integration at the user interface layer (server side): the glue is portlets in

portals

Integration at the user interface layer (client side): the glue is mashups

Labels: eai, patterns

Posted by Jack van Hoof @ 4:41 PM

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3 comments:

Nick Malik said...

Hi Jack,

Fascinating analysis. A bit oversimplified for my taste. Don't get me wrong: as a

reference roadmap, it is fairly interesting, but there are elements that I believe make it

impractical or unrealistic.

For example, in the first diagram, you show apps integrated only between middle layers.

I disagree. Apps can be integrated with connections from db-2-db, middle-2-middle, ui-2-

ui, and by using humans (app-2-human-2-app).

Failing to recognize that creates a simple model, but one that may miss a critical

element: you can't move some of that integration into the EAI without forcing a complete

repartition and rewrite of the app.

Second, pulling the U/I off of a set of apps is often untenable, because it assumes good

design on the part of the original author (allowing the u/i to come off). You also lose sight

of the composability aspects. Where does composition happen in this model?

Third, you do NOT want to move to shared databases. They are an astoundingly bad

idea in SOME cases, and in MOST cases are actually infeasable. This is especially true

with larger COTS packages.

I like your sensabilities, but there is a better way to create this unified view. It is more

revolutionary than evolutionary, I'm afraid. But it can be done. Just not this way.

August 25, 2007 5:34 PM

Jack said...

http://blogs.msdn.com/nickmalikhttp://soa-eda.blogspot.com/2007/08/what-is-eai.html?showComment=1188056040000#c7504619963777631790http://www.blogger.com/profile/10073941747649739657http://www.blogger.com/profile/10073941747649739657http://www.blogger.com/profile/10073941747649739657http://blogs.msdn.com/nickmalikhttp://www.blogger.com/profile/10073941747649739657http://www.blogger.com/profile/10073941747649739657http://blogs.msdn.com/nickmalikhttp://www.blogger.com/profile/10073941747649739657http://www.blogger.com/profile/10073941747649739657http://blogs.msdn.com/nickmalikhttp://www.blogger.com/profile/10073941747649739657http://soa-eda.blogspot.com/2007/08/what-is-eai.html?showComment=1188056040000#c7504619963777631790http://blogs.msdn.com/nickmalik

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Hi Nick,

Thanks for your input. Of course it is oversimplified as all of the patterns I present here.

How can it be otherwise...

I started in the first diagram explaining how monolithic applications communicate:

software that pass files to each other. Believe me, we got over 400 business applications

that are linked together in this way.

I hope it is clear that I didn't want to define a roadmap; I tried to explain the different

views on application integration.

You are right: Apps can be integrated with connections from db-2-db, middle-2-middle,ui-2-ui, and by using humans (app-2-human-2-app). That is exactly what I try to explain

in this posting.

We have put in place a portal, an ESB and we standardize on two DBMS systems. That

is our application infrastructure.

We certainly don't break up our applications. But we enforce all changes to applications

and - more over - all new development efforts (including selecting packaged software) to

adhere the use of our application infrastructure (our portal, our ESB and our data

storgage facilities). And we prescribe the protocol standards like WSRP, JSR168,

SOAP, SQL etcetera. Developers are free to build their applications the way they like,

but the connectors to the application infrastructure must comply to our (open) standards,

and they are enforced to use this infrastructure.

About shared databases: you may be right, but take it in a broader perspective. We offer

data virtualisation, synchronization, back-up/recovery, and so on. These services are

meant when I say (oversimplified) shared databases.

-Jack

August 25, 2007 6:21 PM

http://soa-eda.blogspot.com/2007/08/what-is-eai.html?showComment=1188058860000#c1172138250125432160http://www.governmentfreegrants.org/http://soa-eda.blogspot.com/2007/08/what-is-eai.html?showComment=1188058860000#c1172138250125432160

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Free Grant Kit said...

Thanks for the info, you can also find Government Grants here,

or Free Grant Kit here,

Free Grant Kit Grant Kit

March 09, 2009 1:11 AM

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8/3/2019 SOA and EDA

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Blog Archive

2010 (4)

o June (2)

Proudly presented...

Flabbergasted

o

May (2) Start with "Why"

Cloud Computing Explained

2009 (11)

o October (1)

EDA in practice: Hi Jim, I need some data from you...

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The CIO's top 3 priorities

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Another great document on Cloud Computing

Proudly Presented: The Cloud

SOA beyond the hype

o April (2)

Cloud Computing: From Custom-build via COTS to Saa...

Diving into the Nerd's level of SOA

o March (2)

The importance of semantics mediation

A Federared Service Bus Infrastructure

o January (2)

The 10,000 Hour Rule

SOA Governance

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8/3/2019 SOA and EDA

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2008 (66)

o December (2)

Business Process Driven SOA - using BPMN and BPEL

Architectural Principles and Solution Architecture...

o November (8)

The architectural principle of fully self containe...

SOA Cookbook

Enterprise Agility - An Integrated Approach

Your SOA needs a Business Case

Cloud Computing: 16 corrections

CEP versus ESP - an academic exersise

SOA, EDA and CEP a winning combo

Is Event Processing revolutionary?

o October (5)

Using CEP is not beginning but finishing of EDA

EDA versus CEP, once again...

Market does not understand EDA

SOA Approach to Integration

EDA versus CEP (and SOA)

o September (3)

Monitoring services

SOA versus Service Calls - a short story

About failing projects and trust

o August (5)

Easy design decisions

Service Oriented Architecture with Java

How to model EDA

About CIOs and the tsunami

Writing lesson on EDA

o July (3)

Paying to stay dumb

"Irresistible Forces Meet the Movable Objects"

SOA and business applications

o June (8)

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My visit to Apama

Business versus technology

Which ESB do you choose?

The lethal power of a project leader

Do you recognize the cloud trend?

Ripping off services layers, bad idea

Enterprise Architect versus Solution Architect

Justifying SOA and ESB, how not to...

o May (3)

What is a Mashup?

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2007 (40)

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o August (10)

Thanks Udi Asynchronous and Synchronous: keep it simple

What is EAI?

SOA-selling battle goes on in blogosphere

Selling SOA to the business is a waste of time

Bringing SOA to Life

The big mistake about EDA

BPM versus SOA

The Role of Event Processing in Modern Business How to implement identity based Service Access Con...

o June (10)

o May (5)

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o March (2)

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