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Objective: Demonstrate the use of the Callout mediator for synchronous web service invocations.
<!-- Simple callout mediator --> <definitions xmlns="http://ws.apache.org/ns/synapse"> <callout serviceURL="http://localhost:9000/services/SimpleStockQuoteService" action="urn:getQuote"> <source xmlns:s11="http://schemas.xmlsoap.org/soap/envelope/" xmlns:s12="http://www.w3.org/2003/05/soap-envelope" xpath="s11:Body/child::*[fn:position()=1] | s12:Body/child::*[fn:position()=1]"/> <target xmlns:s11="http://schemas.xmlsoap.org/soap/envelope/" xmlns:s12="http://www.w3.org/2003/05/soap-envelope" xpath="s11:Body/child::*[fn:position()=1] | s12:Body/child::*[fn:position()=1]"/> </callout> <property name="RESPONSE" value="true"/> <header name="To" action="remove"/> <send/> <drop/> </definitions>
Prerequisites:
In this sample, the Callout mediator does the direct service invocation to the StockQuoteService using the client request, gets the response, and sets the response as the first child of the SOAP message body. Then, using the Send mediator, the message is sent back to the client.
Invoke the client as follows.
ant stockquote -Daddurl=http://localhost:9000/services/SimpleStockQuoteService -Dtrpurl=http://localhost:8280/