chapter 1 - eai intoduction

8/10/2019 Chapter 1 - EAI Intoduction

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Enterprise ApplicationIntegration


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Content

Architectures Middleware

What is EAI A Typical EAI Syste EAI !ene"its

Conclusion


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Architectures

1 layer architecture # onolithic In"or ation Syste s # presentation$ application logic$ and resource

anage ent were erged into a single tier 2 layer architecture # separation o" presentation layer "ro other 2 layers

%app & resource'

# (eca e popular as )ser*er/client) syste s 3 layer architecture # can (e achie*ed (y separating +M %resource

anage ent' "ro application logic layer


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Multi-tier Architectures

Where to put the (usiness-logic. # Client tier - 0

at clients

+ei ple enting it "or each di""erent type o" client +edistri(uting clients a"ter each so"tware update

# 4ata tier - 0 5endor and technology dependence grows 4i""erent applications ha*e di""erent needs "or the

sa e data 6er"or ance issues in resource usage


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Multi-tier Architectures

Where to put the (usiness-logic. # Middle tier - 8ES

!usiness logic has its own tier

We( (rowsers9TM:$ ;a*a


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Middleware I

Allows co unication # through a standard language # across di""erent plat"or s # (etween legacy and oder applications

Ta?es care o" # transactions (etween ser*ers

# data con*ersion # authentication # co unications (etween co puters


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Middleware II

6ro*ides runti e en*iron ent "orco ponents in the iddle-tier # Co ponent li"ecyle and anage ent # Transaction$ e*ent and security ser*ices # 6ro*ides connections to data(ases$

ain"ra es and legacy syste s

Seperates client-tier "ro the data source # Clean seperation o" user-inter"aces andpresentation logic "ro the data source


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Middleware III

Main use todayB legacy wrapping "or thinclient architectures

=ser inter"aces

!usiness logic

4ata sources

Client-tier %


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What is EAI

A step "orard in the e*olution o"iddleware

Integrates applications and enterprise datasources so that they can easily share(usiness processes and data

Integration is done without signi"icantchanges o" applications and data sources


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Middleware

Middleware

Middleware

Middleware

Middleware

EAI

Middleware


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E+6 Syste

:egacy Syste

4ata(ases

C+M Syste

Enterprise 6ortal Application

inancial Syste

SCM Syste

Internal Applications%;a*a$C$C&&'

EAI


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E a pleB a si ple supply chainpurchase

order

deli*er goods

write in*oice

order atricle

chec?a*aila(ility

docu entcusto er-contact

nota*aila(le a*aila(le

rdering Syste

WarehouseControlsyste

C+M Syste

E+6 Syste

Manu"acturing

Syste

inancial Syste

!usiness 6rocessManage ent


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Co ponents o" EAI

Adapters # ap heterogenous data "or ats$ inter"aces

and protocols into a co on odel and"or at

# hide heterogeneity # present uni"or *iew o" layers (elow

Message (ro?ers # "acilitates the interaction a ong adapters


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Message !ro?ers

Message oriented iddleware

Supporting integration o" heterogenoussyste s :ogic "or routing essages

iltering and processing essages


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ld essage-(asedinteropera(ility

in*entoryanage ent

pay ent-syste

onth-endclosingshipping

essage-oriented iddleware

dispacher

new 6


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Message !ro?ers

in*entoryanage ent

pay ent-syste

onth-endclosingshipping

essage (ro?er

dispacher

new 6


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4i""erence

sender recei*er

essage (ro?er core

In (asic M M it is thesender who speci"ies theidentity o" the receiers

With essage (ro?ers$custo essage routinglogic can (e de"ined at the

essae (ro?er le*el or atthe Jueue le*el


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+outing logic

senderKs identity essage type

essage content

4e"inition # essage (ro?er le*el # Jueue le*el


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in*entoryanage ent

%su(scri(er'

pay entsyste%su(scri(er'

onth-endclosing

%su(scri(er'

shipping%su(scri(er'

essage (ro?er

dispacher %pulisher'

new 6

The 6u(lish/Su(scri(eInteraction Model


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4e"inition essages su(scri(ers

want to recei*e 0a espaces

# new 6 N # Supply Chain new 6 N # Supply Chain ON

6ara eter-(ased # type P new 6 N A04 custo er P ACME

Co N A04 Juantity 12DD N


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The 6u(lish/Su(scri(eInteraction Model

ad in

essage (ro?er M!-A

client client Q ad in

essage (ro?er M!-C

client client Q

ad in

essage (ro?er M!-!

client client Q


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E a pleB Message e changes

Fuotation scenario1 +ecei*ing the Juote "ro the custo er 2 Accessing the Juotation syste to o(tain a

Juote3 Inserting Juote in"or ation into a "orecasting

syste %i e $ a syste that predicts the order

*olu e', Sending the Juote (ac? to the custo er


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E a pleB Message e changespu(lication o" a

Juote+eJuest essage

deli*ery o" essageJuote+eJuest

synchronous in*ocationo" the getFuote "unction

pu(lication o" anewFuote essage

deli*ery o" essagenewFuote

in*ocation o" thecreate orecastEntry

procedure

S artFuotation S art orecasting

S artFuotationadapter

S art orecastingadapter

essage (ro?er

pu(lication o" a Juoteessage

deli*ery o" essageJuote+ F processing


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EAI (ene"itsB

:ower de*elop ent costs # Integration is si pler (ecause syste s are ore

loosely coupled than in o(Lect (ro?ers

:ower opportunity costs # Integration is done ore Juic?ly # corresponding cost sa*ings reachie*ed sooner

:ower aintenance e""ort # adapters e tract the interaction with e ternal syste s # signi"icant ad*antage "ro the so"tware engineering

point o" *iew


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Conclusion

Enterprises integrate their applications # less e pensi*e than replace ent # ore e""icient than in"or ation islandsN

Enterprises ust esta(lish we(-presenceand a?e (usiness ser*ices a*aila(le towe(-clients

chapter 1 - eai intoduction

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