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| |
| <document> |
| <properties> |
| <title>Apache Synapse - Sample 1</title> |
| </properties> |
| <body> |
| <section name="Sample 1: Simple Content Based Routing (CBR) of Messages"> |
| <div class="xmlConf"><definitions xmlns="http://ws.apache.org/ns/synapse"> |
| |
| <sequence name="main"> |
| <!-- filtering of messages with XPath and regex matches --> |
| <filter source="get-property('To')" regex=".*/StockQuote.*"> |
| <then> |
| <send> |
| <endpoint> |
| <address uri="http://localhost:9000/services/SimpleStockQuoteService"/> |
| </endpoint> |
| </send> |
| <drop/> |
| </then> |
| </filter> |
| <send/> |
| </sequence> |
| |
| </definitions></div> |
| <subsection name="Objective"> |
| <p> |
| Introduction to simple content based routing - Shows how a message could be |
| made to pass through Synapse using the dumb client mode, where Synapse acts as |
| a gateway to accept all messages and then perform mediation and routing based |
| on message properties or content. |
| </p> |
| </subsection> |
| <subsection name="Pre-requisites"> |
| <p> |
| <ul> |
| <li> |
| Deploy the SimpleStockQuoteService in the sample Axis2 server and start Axis2 |
| </li> |
| <li> |
| Start Synapse using the configuration numbered 1 (repository/conf/sample/synapse_sample_1.xml) |
| <div class="command"> |
| Unix/Linux: sh synapse.sh -sample 1<br/> |
| Windows: synapse.bat -sample 1 |
| </div> |
| </li> |
| </ul> |
| </p> |
| </subsection> |
| <subsection name="Executing the Client"> |
| <p>Execute the sample client in the dumb client mode using the following command.</p> |
| <div class="command">ant stockquote -Dtrpurl=http://localhost:8280/services/StockQuote</div> |
| |
| <p> |
| This time you will see Synapse receiving a message for which Synapse was set |
| as the ultimate receiver. The filter mediator in the main sequence performs |
| a regular expression match on the 'To' header (http://localhost:8280/services/StockQuote) |
| to check whether it matches the expression ".*/StockQuote.*". Since the 'To' header |
| matches this expression the child mediators of the filter mediator get executed. |
| As a result, the message is sent to the Axis2 server. The drop mediator after |
| the send mediator terminates the flow of the sequence. Axis2 server will print |
| the following log when it receives the stock quote request from Synapse. |
| </p> |
| <div class="consoleOutput">Sat Nov 18 21:01:23 IST 2006 SimpleStockQuoteService :: Generating quote for : IBM</div> |
| <p> |
| During response processing, the filter condition fails, and thus the child mediators |
| of the filter are skipped. The 'send' mediator at the end of the sequence |
| forwards the response back to the client using the implicit 'To' address. |
| The client will print a message similar to the following when it receives the |
| response. |
| </p> |
| <div class="consoleOutput">Standard :: Stock price = $95.26454380258552</div> |
| </subsection> |
| </section> |
| <p><a href="../samples.html">Back to Catalog</a></p> |
| </body> |
| </document> |
