[#OCESPER-12] Reduce configuration needed for inbound channel adapter in simple case

OpenCredo Esper

Reduce configuration needed for inbound channel adapter in simple case

Created: 19/Feb/10 11:21 AM Updated: 21/Feb/11 12:02 PM

Component/s:

EsperSpringIntegrationSupport

Affects Version/s:

2.0

Fix Version/s:

2.1

Time Tracking:

Original Estimate:

1 day

Remaining Estimate:

1 day

Time Spent:

Not Specified

Description

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Currently the inbound channel adapter is plugged in to an EsperTemplate as an update listener. Where I simply want to connect an Esper query I would expect the adapter to be capable of creating a default template so the below should work.

<inbound-channel-adapter channel="channelToPublishTo">
<esper-query sourceId="indicateWhereTheEventCameFrom">select * from X</esper-query>
</inbound-channel-adapter>

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Tomas Lukosius added a comment - 19/Aug/10 10:26 AM

Changed assignee and fix version.

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Tomas Lukosius added a comment - 21/Aug/10 10:34 AM

Inbound adapter creates EsperTemplate and listens for events specified in <si-esper:epl>:

<si-esper:inbound-channel-adapter id="inboundGateway" channel="inboundRawEsperMessages" template-name="testTemplate">
<si-esper:epl>select * from org.opencredo.esper.integration.MessageContext</si-esper:epl>
</si-esper:inbound-channel-adapter>

Note1: attribute "template-name" is useful when you need to create EsperTamplate with name, so next snipped is valid too:
....
<si-esper:inbound-channel-adapter id="inboundGateway" channel="inboundRawEsperMessages" template-name="testTemplate">
<si-esper:epl>select * from org.opencredo.esper.integration.MessageContext</si-esper:epl>
</si-esper:inbound-channel-adapter>

<esper:template id="testTemplate">
<esper:statements></esper:statements>
</esper:template>
....

Now it is possible to add events to template bean "testTemplate" and inbound-channel-adapter with id "inboundGateway" will react to events on those events.

Note2:
<si-esper:epl> - is optional, if it is not specified <si-esper:inbound-channel-adapter ..> becomes unmatched listener.