Sample 430: Callout Mediator for Synchronous Web Service Invocations
<definitions xmlns="http://ws.apache.org/ns/synapse">
<sequence name="main">
<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>
<respond/>
</sequence>
</definitions>
Objective
Demonstrate the usage of the callout mediator for making synchronous (blocking) Web service calls during mediation
Pre-requisites
- Deploy the SimpleStockQuoteService in the sample Axis2 server and start Axis2
-
Start Synapse using the configuration numbered 430 (repository/conf/sample/synapse_sample_430.xml)
Unix/Linux: sh synapse.sh -sample 430
Windows: synapse.bat -sample 430
Executing the Client
In this sample, the callout mediator does the direct service invocation to the StockQuoteService using the client request, gets the response and sets it as the first child of the SOAP message body. Then using the send mediator, the message is sent back to the client. As a result there is no need to define any endpoints in this configuration.
Invoke the client as follows.
ant stockquote -Daddurl=http://localhost:9000/services/SimpleStockQuoteService -Dtrpurl=http://localhost:8280/