Buddhima Wijeweera interned in the Technology Group - Integration team at their department of Computer Science & Engineering. Their two internship projects were to create a resequencing message processor and a JDBC message store for the ESB. The resequencer is a message processor that sends messages out in the proper sequence by preserving the order, as the ESB currently processes messages through different routes that change the original order. The implementation finds the starting sequence number and manages the flow of messages through the proxy, in-sequence, message store selected by the resequencer, and to the endpoint.

1. Internship period
Buddhima Wijeweera
Department Of Computer Science & Engineering

2. As An Intern I’m Working For
 Technology Group – Integration
 Team - ESB

3. Internship Projects
 Create a Resequencing Message Processor for ESB
 Create a JDBC Message Store For Synapse

4. Resequencer
 What is resequencer
 What is currently happen
 Requirement
 Implementation
 How it works

5. Resequencer is
 A message processor in ESB
 Sending out messages in a sequence
 Preserving the order of sending messages

6. Current situation
 ESB gets messages
 Mediates in different routes
 All routes are not similar
 Order of messages after processing is different
 Endpoints send messages to services

7. Requirement
 At some point in ESB messages should have the order
 Implement the Resequencer Enterprise Integration Pattern in ESB
Link: http://www.eaipatterns.com/Resequencer.html

8. Implementation
 Finding Starting Sequence Number
 Flow of Messages

9. Finding Starting
Sequence Number
 Before starting ESB
 After starting ESB

10. Flow Of Messages
 Proxy
 In-sequence
 Message Store
 Selection done by
Resequencer
 Rest of processing
 Endpoint

11. How it works
 Messages mediate through ESB
 At some point messages fall in to a message store
 Resequencer attached to that store do a linear search on the
sequence number inside messages
 If it find out the message with the sequence number it expects,
handover that message to respective sequence

12. Demonstration

13. Special Advantages
 Depends on current Message Processor implementation
 No special kind of store is needed
 Resequencer has an in-built algorithm to identify starting number
 Sending to a sequence enables user to do more with selected
message
 More options to configure process

14. Limitations
 Currently can be applied with an In-Memory Store
 To avoid this new project on creating a JDBC Message Store support for
ESB has begun

15. Test Automation Period
 ESB Test Automation
 Conditional Router Mediator
 Filter Mediator
 In mediator
 Validate Mediator
 Scheduled Message Processor
 Client Patch Automation
 Checking nhttp support
 Persistency of message processors and stores
 Fault Message validation
 Service WSDL through proxy

16. Technologies & Tools I Experienced
 Maven  Java
 TCPMon  JDBC
 Jconsole  IntelliJ IDEA
 Schema Validation  VFS
 JMS  Xpath
 XML  SOAP UI
 WSDL  ActiveMQ
 Axis2  Remote Debugging
 Synapse Configuration  Ant

17. Questions ?

18. Thank You !