Webinar presentation http://www.returnonintelligence.ru/webinars/enterprise-service-bus/

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Enterprise Service Bus
Evgeny Epifantsev
december 2009
updated 2012

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Trainer contacts
• Evgeny Epifantsev
• Developer
• eepifantsev@exigenservices.com
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Goals
• Provide an overview on:
• What is Enterprise Service Bus?
• How to implement it?
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Agenda
• Introduction
• EAI evolution: P2P->MOM Hub->ESB
• ESB purpose and functions overview
• QoS and Policy Enforcement
• Components: Mediator VFTER (validate, filter, transform, enrich, route),
Choreographer
• Example of above topics
• Open source ESB
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Part 1: Overview and ESB Concepts

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Definition
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ESB is idea of using common integration infrastructure across all
enterprise application and systems.
An Enterprise Service Bus (ESB) is a new architecture that exploits
Web services, messaging middleware, intelligent routing,
and transformation. ESBs act as a lightweight,
ubiquitous integration backbone through which software services
and application components flow."

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What is ESB?
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What is ESB?
Is a Pattern?
Is a Product?
Is an Architectural Component?
Is a Hardware Component?

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Evolution
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Point-to-Point
- Tight coupling
- Complexity ~N2
- No visibility
- Hard to secure
Service Bus (ESB)
+ Scalable
+ Service-oriented
+ Flexible
- Harder administration
+ Standards-based
+ Cost less than EAI
bus
Enterprise Application
Integration
Hub:
- Scalability
+ Easy administration
Bus:
- Standards and
proprietary
- High cost

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ESB Architecture context
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Java/EJB Http
Java/EJB HttpService location transparency
Sharing service across the enterprise
Separate of Business Services from Service implementation

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ESB as a Pattern of SOA
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WSDL
Business service
definition PlaceTrade
PlaceTrade
saveOrTradeOrder()
Java
implementation service
For saveOrTradeOrder()

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ESB capabilities
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Routing
Message
transformation
Message
enhancement
Security
Transaction
management Service
orchestration
Process
choreography
Message
processing
Mapping
service
Protocol
transformation

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ESB basic functions
ROUTING messages between services
• Addressability, static/deterministic routing
• Content-based routing
• Policy-based routing
• Complex Rule-based routing
CONVERTATION
•Adapters and protocol conversion
•Transport protocols (synchronous and
asynchronous)
MESSAGING
• Message transformation
• Message processing
• Message enhancement

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BUS: Protocol Conversion
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ESB
Requests
Responses
Requests
Responses
Requests
Responses
Requests
Responses
Service
Requester
Service
Provider
Phone with wap - WXML/HTTPPhone with wap - WXML/HTTP
.NET - SOAP/HTTP.NET - SOAP/HTTP
C++ - XML/JMSC++ - XML/JMS
SAP - BAPISAP - BAPI
WebSphere 5.1 - SOAP/JMSWebSphere 5.1 - SOAP/JMS
SAP - BAPISAP - BAPI
External partner - SOAP/HTTPSExternal partner - SOAP/HTTPS
User application - RMIUser application - RMI
Database – SQLDatabase – SQL
Application - XML/JMSApplication - XML/JMS

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Service mapping
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The ability to translate a business service into the corresponding
service implementation and provide binding and location information
 Could be implemented through XML, a database, or embedded
within the Mediator ESB component
 Usually contains the following core information
• Implementation service name
• Service protocol and binding information
• Protocol-specific info (i.e. timeouts)
• Service-specific routing information

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Process choreography
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The ability to manage complex business process that require the
coordination of multiple business services to fulfill a single business
service request
 Usually BPEL based
PlaceFixedIncomeTrade
CreateOrder SelectBid PlaceTrade ExecuteTrade
Each of business node can be an
independent business service

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Service orchestration
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The ability to manage the coordination of multiple implementation
services
 Can be BPEL based but is usually implemented through inter-
service
communication or aggregate services
 Difference between Service orchestration and Process
Choreography is based on type of service being coordinated
• Process choreography - Business services
• Service orchestration - implementation service

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Transaction management
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The ability to provide a single unit of work for a business service
request by providing a framework for the coordination of multiple
disparate services
 ESB should provide a compensatory transactional framework for a
service request
• WS - Coordination
• WS - AT
• WS –Business Activity

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Security
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The ability to protect enterprise services from authorized access
 Services visible to the entire enterprise through ESB
 The 4 “A’s” of Security
•Authentication
• Authorization
• Auditing
• Administration
 ESB should provide authentication, authorization and auditing
 ESB should access a security manager for authentication and
authorization rather than have the direct responsibility

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Quality of Service and Policy enforcement
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• Security WS-Security, SAML
• Reliable delivery for each connection
• Transaction management
WS-AT, WS-Coordination,
WS-Business Activity
• Traffic management
• Policy (WS-Policy)
R1R1
P1P1
P2P2
Tx_not
supported
Tx_not
supported
Tx_requiredTx_required
Tx_requiredTx_required
CompensationCompensation
CompensationCompensation
requestor provider
1
2
3
response
No
answer

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CEI

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Common Event Infrastructure
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Based on Common Base Event
(IBM implementation of Web Services Distributed Management )
Common Event Infrastructure (CEI) is IBM's implementation of API, and
infrastructure for the creation, transmission, persistence and distribution of a wide
range of business, system and network Common Base Event formatted events.
CEI Event Submission Interfaces (Event Source)
CEI Event Subscription Interfaces (Event Server)
CEI Event Query Interfaces (Event Server)

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CEI Event types

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Common Event Browser

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ESB Components

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ESB components
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 ESB can broken down into the following components
• Mediator
• Service registry
• Choreographer
• Rules Engine
MediatorMediator
Service
registry
Service
registry
ChoreographerChoreographer Rules engineRules engine

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Mediator (Routing, Message transformation)
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Mediator
Requests
Responses
Requests
Responses
Requests
Responses
Requests
Responses
Service
Requester
Service
ProviderValidation
XSD
Validation
XSD
Transform
XSLT
Transform
XSLT
Enrich
XPath
Enrich
XPath
OperateOperateRoute
UDDI
Route
UDDI
VETRO
export
import

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Process choreographer
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BPEL – Business Process Execution language
partnerLink
purchasing
partnerLink
purchasing
purchaseOrderPTpurchaseOrderPT partnerLink
invoicing
partnerLink
invoicing
ComputePricePTComputePricePT
invoiceCallbackPTinvoiceCallbackPT
<wsdl:portType
name="purchaseOrderPT">
<wsdl:operation …
</wsdl:operation>
</wsdl:portType>
<plnk:partnerLinkType
name="purchasingLT">
</plnk:partnerLinkType>
<plnk:partnerLinkType name="invoicingLT">
<plnk:role portType="pos:computePricePT" />
<plnk:role portType="pos:invoiceCallbackPT“ />
</plnk:partnerLinkType>

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BPEL Process
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<sequence>
<receive portType="lns:purchaseOrderPT" … />
<flow>
<invoke portType="lns:computePricePT“ … />
<receive portType="lns:invoiceCallbackPT" …/>
</flow>
<reply portType="lns:purchaseOrderPT” … />
<sequence>
<sequence>
<receive portType="lns:purchaseOrderPT" … />
<flow>
<invoke portType="lns:computePricePT“ … />
<receive portType="lns:invoiceCallbackPT" …/>
</flow>
<reply portType="lns:purchaseOrderPT” … />
<sequence>

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Implementation Mediation Module
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Mediation flow
Mediation module
Requests
Responses
Requests
Responses
Requests
Responses
Requests
Responses
Service
Requester
Service
Provider
Exports Imports
Mediation flow
component ExportsImports

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Implementation mediation Flow
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InterfacesInterfaces Mediation primitivesMediation primitives

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Implementation in Business Works
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Implementation steps
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Import WSDL(SCA, Web
Service, HTML, JMS)
Import WSDL(SCA, Web
Service, HTML, JMS)
Create mediatorCreate mediator
Connect WSDL ports with
mediator (import)
Connect WSDL ports with
mediator (import)
Generate exports with
binging (SCA, Web
Service, HTML, JMS)
Generate exports with
binging (SCA, Web
Service, HTML, JMS)
Messaging ResourcesWebSphere ESB
Create bus instanceCreate bus instance
Setup SDO repositorySetup SDO repository
Setup resource adaptersSetup resource adapters
Create client listeners for
every protocols
Create client listeners for
every protocols
Create interceptorsCreate interceptors
Create mediator (EJB)Create mediator (EJB)

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ESB platforms
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Sun GlassFish ESB NetBeans IDE, BPEL orchestration, WS JAX-WS,
Business Rules, Transaction, BAM
Matrix BusinessWorks no transaction, no dusiness rules, BAM
Mule ESB EE custom implementation model, WS CXF, No BAM,
no Business rules
IONA Fuse ESB Apache ServiceMix, JBI, OSGI, WS CXF, no BAM,
Business rules
WSO2 ESB Apache Synapse, WS Apache Axis2
WebSphere ESB WebSphere MQ, JMS, BPEL, SCA
WS JAX-WS, BAM, Business Rules
Oracle ESB JMS, BPEL

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Open source way
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ESB
Business
Rules
Business
Rules
DroolsDrools
RoutingRouting
eipeip
javajava
camelcamel
ChoreographyChoreographyjBPMjBPM
Transform
ation
Transform
ation
xpathxpath
xsltxslt
simplesimple
EventsEventsIBMIBM
OracleOracle
JMSJMS
AMQAMQ

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Thank You!
Questions?
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