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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 <chain/> of endpoints. The schema does not allow a <request-handler-advice-chain> as a child element of the chain itself.

However, a <request-handler-advice-chain> can be added to individual reply-producing endpoints within a <chain> element. An exception is that, in a chain that produces no reply, because the last element in the chain is an outbound-channel-adapter, that last element cannot be advised. If you need to advise such an element, it must be moved outside the chain (with the output-channel of the chain being the input-channel of the adapter). The adapter can then be advised as usual. For chains that produce a reply, every child element can be advised.