This section explains, through an example scenario, how the Message Expiration EIP can be implemented using WSO2 ESB. The following topics are covered:
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<definitions xmlns="http://ws.apache.org/ns/synapse">
<proxy xmlns="http://ws.apache.org/ns/synapse" name="MessageExpirationProxy" transports="https,http" statistics="disable" trace="disable" startOnLoad="true">
<target>
<inSequence onError="LogAndDropMessageFault">
<log level="full"/>
<send/>
</inSequence>
<outSequence onError="fault">
<log level="full"/>
<send/>
</outSequence>
<endpoint name="TimeoutEndpoint">
<address uri="http://localhost:9000/services/SimpleStockQuoteService">
<timeout>
<duration>30000</duration>
<responseAction>fault</responseAction>
</timeout>
</address>
</endpoint>
</target>
<description></description>
</proxy>
<sequence name="LogAndDropMessageFault">
<log level="full">
<property name="MESSAGE" value="Executing default "fault" sequence"/>
<property name="ERROR_CODE" expression="get-property('ERROR_CODE')"/>
<property name="ERROR_MESSAGE" expression="get-property('ERROR_MESSAGE')"/>
</log>
<drop/>
</sequence>
</definitions> |
Simulating the sample scenario
- Send a request using the Stock Quote client to WSO2 ESB in the following manner. For information on the Stock Quote client, refer to the Sample Clients section in the WSO2 ESB documentation.
ant stockquote -Dtrpurl=http://localhost:8280/services/MessageExpirationProxy -Dsymbol=foo
- Notice the expected response for the request. Next, drop the Axis2 server instance and restart the ESB. The endpoint will time out and be suspended after the timeout period, causing a fault condition.
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