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In this example, the first message is sent to the endpoint specified as cache is not hit. The response will come to the Cache Mediator inside the out mediator, which caches the response. The second similar message will match the cache and the response will be directly fetched from the cache and sent to the requester. This happens because no onCacheHit sequence is defined.

Code Block

	XML
	XML

<definitions xmlns="http://ws.apache.org/ns/synapse">
  <in>
    <cache timeout="20" scope="per-host" collector="false"
      hashGenerator="org.wso2.caching.digest.DOMHASHGenerator">
      <implementation type="memory" maxSize="100"/>
    </cache>

    <send>
      <endpoint>
        <address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
      </endpoint>
    </send>
  </in>

  <out>
    <cache collector="true"/>
    <send/>
  </out>
</definitions>

According to this example configuration, if you define a cache collector using the cache mediator in the in sequence, you need to add the RESPONSE property to consider the message as a response message.

Code Block

language	xml

<api xmlns="http://ws.apache.org/ns/synapse" name="cacheAPI" context="/cache">
   <resource methods="POST GET" uri-template="/headerapi/*">
	<inSequence>
		<cache       <inSequence>
         <cache id="cache-sample" scope="per-host" collector="false" hashGenerator="org.wso2.carbon.mediator.cache.digest.DOMHASHGenerator" timeout="5000">
			<protocol
            <implementation type="HTTP">
				<methods>GET, POST</methods>
				<headersToExcludeInHash>*</headersToExcludeInHash>
				<responseCodes>.*</responseCodes>
				<hashGenerator>org.wso2.carbon.mediator.cache.digest.HttpRequestHashGenerator</hashGenerator>
			</protocol>
		</cache>
		<call>
			<endpoint>
				memory" maxSize="1000"/>
         </cache>
         <call>
            <endpoint>
               <address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
			
            </endpoint>
		
         </call>
		
         <property name="RESPONSE" value="true" scope="default" type="STRING"/>
		<enrich>
			         <enrich>
            <source type="inline" clone="true">
				               <ax21:newvalue 					xmlns:ax21="http://services.samples/xsd">testsamplevalue
				                </ax21:newvalue>
			
            </source>
			<target
				
            <target xmlns:ax21="http://services.samples/xsd" 				xmlns:ns="http://services.samples" action="sibling" xpath="//ns:getQuoteResponse/ns:return/ax21:volume"/>
			         </enrich>
			<cache          <cache scope="per-host" collector="true"/>
			         <respond/>
		      </inSequence>
   </resource>
</api>

Excerpt

hidden	true

Description of the Cache Mediator in WSO2 ESB.

Versions Compared

Old Version 3

New Version 4

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