The document discusses new coordination framework capabilities in WSO2 ESB 4.9.0 that improve business availability and scalability. It introduces scheduled tasks and message processors that can be deployed in clusters to ensure continuous operation as long as one node remains active. Message processors provide guaranteed delivery using store and forward mechanisms while supporting throttling. Scheduled tasks allow injecting messages on timed intervals using cron expressions. A demonstration shows coordinating tasks and message processors across a clustered environment.

1. Improved Business Availability and
Scalability with WSO2 ESB 4.9.0’s New
Coordination Framework
Ravindra Ranwala
Software Engineer
Nadeeshaan Gunasinghe
Software Engineer
Nov 2015

2. About the Presenters
● Ravindra Ranwala Software Engineer WSO2
● Nadeeshaan Gunasinghe Software Engineer WSO2

3. Outline
● Business Availability
● Business Scalability
● Coordination Support in WSO2 ESB
○ Message Processor
○ Scheduled Tasks
● Demonstration on Tasks and Message Processor in a Clustered Environment
● Conclusion
● Q&A

4. Business Availability
● Ensure your systems run most of the time without interruptions
● How to Achieve
○ Avoiding Single point of failures
● Real world Implementation
○ Clusters of Service Nodes

5. Business Scalability
● Definition: Accepts increased traffic in graceful and controlled manner
● How to Achieve
○ By adding more nodes to a system
● Real World Implementation
○ Clustering the Nodes

6. Task Coordination Support in WSO2 ESB
● Using the much faster coordination support of the Carbon framework
● Scheduled Tasks and Message Processors
○ Deploying in the clusters and coordination across the nodes
○ Continuously running as long as there is at least one node is up and
running

7. Message Processor
● Guaranteed delivery with store and forward mechanism
● Rate matching/ Throttling can be done by using the Sampling Processor
● JMS Message broker as the persistence store – WSO2 MB, Apache ActiveMQ etc.
● MP Coordination support - Clustered Environment
○ Yields high Availability and Scalability

8. Store And Forward - Guaranteed Delivery
● Scheduled Message Forwarding Processor can be
used.

9. Store and Forward - Request Rate Matching
● Sampling Message Processor can be used.

10. MP Coordination Support - Single Task

11. MP Coordination Support - Multiple Tasks

12. Scheduled Tasks
● Facilitate to run a job triggered by a timer
● WSO2 ESB has it’s inbuilt task support to allow injecting messages to ESB in scheduled
intervals
● Task Trigger types
○ Specifying the count and interval
○ Cron expressions
○ Making the task run only once with the once atribute

13. Scheduled Tasks Ctd..
● Writing own tasks with custom Java Classes implementing org.apache.synapse.startup.Task
Interface

14. Scheduled Tasks Ctd..

15. Scheduled Tasks Ctd..
● Source Configuration for scheduling the task
<task class="org.apache.synapse.startup.tasks.MessageInjector"
group="synapse.simple.quartz" name="SimpleStockQuoteTask">
<trigger count="12" interval="60"/>
</task>

16. Scheduled Tasks Ctd..
● Injecting a Message to a Specified Sequence through a task
<task name="SampleInjectToSequenceTask" class="org.apache.synapse.startup.tasks.MessageInjector" roup="synapse.simple.quartz">
<trigger count="2" interval="5"/>
<property xmlns:task="http://www.wso2.org/products/wso2commons/tasks"name="injectTo" value="sequence"/>
<property xmlns:task="http://www.wso2.org/products/wso2commons/tasks"name="message">
<m0:getQuote xmlns:m0="http://services.samples">
<m0:request>
<m0:symbol>IBM</m0:symbol>
</m0:request>
</m0:getQuote>
</property>
<property xmlns:task="http://www.wso2.org/products/wso2commons/tasks"name="sequenceName" value="SampleSequence"/>
</task>

17. Scheduled Tasks Ctd..
● Injecting a Message to a Specified proxy service through a task
<task name="SampleInjectToProxyTask" class="org.apache.synapse.startup.tasks.MessageInjector" group="synapse.simple.quartz">
<trigger count="2" interval="5"/>
<property xmlns:task="http://www.wso2.org/products/wso2commons/tasks"name="message">
<m0:getQuote xmlns:m0="http://services.samples">
<m0:request>
<m0:symbol>IBM</m0:symbol>
</m0:request>
</m0:getQuote>
</property>
<property xmlns:task="http://www.wso2.org/products/wso2commons/tasks"name="proxyName" value="SampleProxy"/>
<property xmlns:task="http://www.wso2.org/products/wso2commons/tasks"name="injectTo" value="proxy"/>
</task>

18. Scheduled Task Demo

19. Q & A

20. Thank You

21. References
● https://en.wikipedia.org/wiki/High_availability_software
● https://en.wikipedia.org/wiki/Scalability
● http://ravindraranwala.blogspot.com/2015/09/message-processor-coordination-support.html
● http://soatutorials.blogspot.com/2015/09/wso2-esb-490-released.html

22. Contact us !