Spring Integration - Cache requests for inbound/outbound gateway

Do you use inbound or outbound http gateway in Spring Integration and you was thinking about caching some requests ? There is a solution for that! It's can be achieved with <request-handler-advice-chain> and Spring Cache Advice.

<int-http:outbound-gateway>
   <int-http:request-handler-advice-chain>
        <cache:advice>
              <cache:caching cache="cacheKey">
                    <cache:cacheable method="handle*Message" key="#a0.payload.id"/>
              </cache:caching>
        </cache:advice>
   </int-http:request-handler-advice-chain>
</int-http:outbound-gateway>

You might see above that handle*Message will be considered by Spring Cache Advice to invoke cache functionality. To be more specific we are thinking about handleRequestMessage method and it's parameters defined as a part of HttpRequestExecutingMessageHandler which will be considered as a key - id in our case. Moreover you need to define explicitly cacheManager bean and define key for cache entry (cacheKey in our case) using for instance EhCache.

References : [1] Spring Integration - Cache for inbound/outbound gateway