Enterptise Service Bus webinar part 1. Author: Evgeniy Epifantsev

1. Enterprise Service Bus
Evgeny Epifantsev
december 2009
updated 2012
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2. Trainer contacts
• Evgeny Epifantsev
• Developer
• eepifantsev@exigenservices.com
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3. Goals
• Provide an overview on:
• What is Enterprise Service Bus?
• How to implement it?
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4. 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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5. Part 1: Overview and ESB Concepts
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6. Definition
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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7. What is ESB?
What is ESB?
Is a Pattern?
Is a Product?
Is an Architectural Component?
Is a Hardware Component?
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8. Evolution
Enterprise Application Service Bus (ESB)
Integration
+ Scalable
Hub:
+ Service-oriented
- Scalability
+ Flexible
+ Easy administration
- Harder administration
Bus:
+ Standards-based
- Standards and
+ Cost less than EAI
proprietary
bus
- High cost
Point-to-Point
- Tight coupling
- Complexity ~N2
- No visibility
- Hard to secure
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9. ESB Architecture context
Java/EJB Http
Service location transparency Java/EJB Http
Sharing service across the enterprise
Separate of Business Services from Service implementation
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10. ESB as a Pattern of SOA
PlaceTrade
WSDL
Business service
definition PlaceTrade
saveOrTradeOrder()
Java
implementation service
For saveOrTradeOrder()
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11. ESB capabilities
Message Protocol
Message
transformation transformation Mapping
enhancement
service
Routing
Message
processing
Security
Transaction Process
management choreography
Service
orchestration
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12. ESB basic functions
ROUTING messages between services
• Addressability, static/deterministic routing
• Content-based routing
• Policy-based routing
• Complex Rule-based routing
MESSAGING
• Message transformation
• Message processing
• Message enhancement
CONVERTATION
•Adapters and protocol conversion
•Transport protocols (synchronous and
asynchronous)
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13. BUS: Protocol Conversion
Phone with wap - - WXML/HTTP
Phone with wap WXML/HTTP SAP - - BAPI
SAP BAPI
.NET - - SOAP/HTTP
.NET SOAP/HTTP External partner - -SOAP/HTTPS
External partner SOAP/HTTPS
ESB
Service Requests
Requests Requests
Requests Service
Responses
Responses Responses
Responses
Requester Provider
C++ - -XML/JMS User application - -RMI
User application RMI
C++ XML/JMS
SAP - - BAPI
SAP BAPI Database ––SQL
Database SQL
WebSphere 5.1 - -SOAP/JMS
WebSphere 5.1 SOAP/JMS Application - -XML/JMS
Application XML/JMS
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14. Service mapping
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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15. Process choreography
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
Each of business node can be an
PlaceFixedIncomeTrade independent business service
CreateOrder SelectBid PlaceTrade ExecuteTrade
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16. Service orchestration
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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17. Transaction management
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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18. Security
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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19. Quality of Service and Policy enforcement
requestor provider
• Security WS-Security, SAML 1
No
answer
2
• Reliable delivery for each connection 3
response
• Transaction management
WS-AT, WS-Coordination, P1
P1
WS-Business Activity
Tx_required
Tx_required
• Traffic management Compensation
Compensation
Tx_not
Tx_not
R1
R1 supported
supported
• Policy (WS-Policy)
Tx_required
Tx_required
Compensation
Compensation
P2
P2
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20. CEI
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21. Common Event Infrastructure
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.
Based on Common Base Event
(IBM implementation of Web Services Distributed Management )
CEI Event Submission Interfaces (Event Source)
CEI Event Subscription Interfaces (Event Server)
CEI Event Query Interfaces (Event Server)
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22. CEI Event types
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23. Common Event Browser
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24. ESB Components
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25. ESB components
 ESB can broken down into the following components
• Mediator
• Service registry
• Choreographer
• Rules Engine
Service
Service
Mediator
Mediator registry
registry
Choreographer
Choreographer Rules engine
Rules engine
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26. Mediator (Routing, Message transformation)
VETRO
Service Service
Requester Mediator
Validation
Validation Enrich
Enrich
Provider
XSD
XSD XPath
XPath
Requests
Requests Requests
Requests
Responses
Responses Responses
Responses
Transform
Transform Route
Route Operate
Operate
XSLT
XSLT UDDI
UDDI
export
import
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27. Process choreographer
BPEL – Business Process Execution language
<plnk:partnerLinkType
name="purchasingLT">
</plnk:partnerLinkType>
partnerLink ComputePricePT
ComputePricePT
partnerLink partnerLink
partnerLink
purchaseOrderPT
purchaseOrderPT purchasing
purchasing invoicing
invoicing
invoiceCallbackPT
invoiceCallbackPT
<wsdl:portType
name="purchaseOrderPT">
<wsdl:operation …
</wsdl:operation>
</wsdl:portType>
<plnk:partnerLinkType name="invoicingLT">
<plnk:role portType="pos:computePricePT" />
<plnk:role portType="pos:invoiceCallbackPT“ />
</plnk:partnerLinkType>
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28. BPEL Process
<sequence>
<sequence>
<receive portType="lns:purchaseOrderPT" … />
<receive portType="lns:purchaseOrderPT" … />
<flow>
<flow>
<invoke portType="lns:computePricePT“ … />
<invoke portType="lns:computePricePT“ … />
<receive portType="lns:invoiceCallbackPT" …/>
<receive portType="lns:invoiceCallbackPT" …/>
</flow>
</flow>
<reply portType="lns:purchaseOrderPT” … />
<reply portType="lns:purchaseOrderPT” … />
<sequence>
<sequence>
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29. Implementation Mediation Module
Mediation module
Requests
Requests Requests
Requests
Responses
Responses Responses
Responses
Mediation flow
Service Service
Requester Provider
Mediation flow
Imports Exports component Imports Exports
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30. Implementation mediation Flow
Interfaces
Interfaces Mediation primitives
Mediation primitives
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31. Implementation in Business Works
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32. Implementation steps
WebSphere ESB Messaging Resources
Import WSDL(SCA, Web
Import WSDL(SCA, Web Create bus instance
Create bus instance
Service, HTML, JMS)
Service, HTML, JMS)
Setup SDO repository
Setup SDO repository
Create mediator
Create mediator
Setup resource adapters
Setup resource adapters
Connect WSDL ports with
Connect WSDL ports with
Create client listeners for
Create client listeners for
mediator (import)
mediator (import)
every protocols
every protocols
Generate exports with
Generate exports with Create interceptors
Create interceptors
binging (SCA, Web
binging (SCA, Web
Service, HTML, JMS)
Service, HTML, JMS)
Create mediator (EJB)
Create mediator (EJB)
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33. ESB platforms
WSO2 ESB Apache Synapse, WS Apache Axis2
Sun GlassFish ESB NetBeans IDE, BPEL orchestration, WS JAX-WS,
Business Rules, Transaction, 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
WebSphere ESB WebSphere MQ, JMS, BPEL, SCA
WS JAX-WS, BAM, Business Rules
Matrix BusinessWorks no transaction, no dusiness rules, BAM
Oracle ESB JMS, BPEL
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34. Open source way
Business
Business eip
eip
Drools
Drools
Rules
Rules Routing
Routing
camel
camel
jBPM
jBPM Choreography
Choreography
java
java
ESB
IBM
IBM Transform
Transform xslt
xslt
Events
Events
ation
ation
xpath
xpath
Oracle
Oracle
JMS
JMS
simple
simple
AMQ
AMQ
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35. Thank You!
Questions?
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