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Adding Behavior to Endpoints
Prior to Spring Integration 2.2, you could add behavior to an entire Integration flow by adding an AOP Advice to a poller’s <advice-chain/>
element.
However, suppose you want to retry, say, just a REST Web Service call, and not any downstream endpoints.
For example, consider the following flow:
inbound-adapter->poller->http-gateway1->http-gateway2->jdbc-outbound-adapter
If you configure some retry-logic into an advice chain on the poller and the call to http-gateway2
failed because of a network glitch, the retry causes both http-gateway1
and http-gateway2
to be called a second time.
Similarly, after a transient failure in the jdbc-outbound-adapter, both HTTP gateways are called a second time before again calling the jdbc-outbound-adapter
.
Spring Integration 2.2 adds the ability to add behavior to individual endpoints.
This is achieved by the addition of the <request-handler-advice-chain/>
element to many endpoints.
The following example shows how to the <request-handler-advice-chain/>
element within an outbound-gateway
:
<int-http:outbound-gateway id="withAdvice"
url-expression="'http://localhost/test1'"
request-channel="requests"
reply-channel="nextChannel">
<int-http:request-handler-advice-chain>
<ref bean="myRetryAdvice" />
</int-http:request-handler-advice-chain>
</int-http:outbound-gateway>
In this case, myRetryAdvice
is applied only locally to this gateway and does not apply to further actions taken downstream after the reply is sent to nextChannel
.
The scope of the advice is limited to the endpoint itself.
At this time, you cannot advise an entire However, a |