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Sample 266: Switching from TCP to HTTP/S

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Last updated: Oct 30, 2012Version comment
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Objective: Demonstrate receiving SOAP messages over TCP and forwarding them over HTTP

<definitions xmlns="http://ws.apache.org/ns/synapse"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://ws.apache.org/ns/synapse http://synapse.apache.org/ns/2010/04/configuration/synapse_config.xsd">

    <proxy name="StockQuoteProxy" transports="tcp">
        <target>
            <endpoint>
                <address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
            </endpoint>
            <inSequence>
                <log level="full"/>
                <property name="OUT_ONLY" value="true"/>
            </inSequence>
        </target>
    </proxy>

</definitions>

Prerequisites:

  • Configure ESB to use the TCP transport. The sample Axis2 client should also be setup to send TCP requests. Refer Setting Up the TCP Transport section in the ESB Samples Setup for more details.
  • Start Synpase using sample 266: ie synapse -sample 266
  • Start Axis2 server with SimpleStockService deployed

This sample is similar to Sample 250 . Only difference is instead of the JMS transport we will be using the TCP transport to receive messages. TCP is not an application layer protocol. Hence there are no application level headers available in the requests. ESB has to simply read the XML content coming through the socket and dispatch it to the right proxy service based on the information available in the message payload itself. The TCP transport is capable of dispatching requests based on addressing headers or the first element in the SOAP body. In this sample, we will get the sample client to send WS-Addressing headers in the request. Therefore the dispatching will take place based on the addressing header values.

Invoke the stockquote client using the following command. Note the TCP URL in the command.

ant stockquote -Daddurl=tcp://localhost:6060/services/StockQuoteProxy -Dmode=placeorder

The TCP transport will receive the message and hand it over to the mediation engine. Synapse will dispatch the request to the StockQuoteProxy service based on the addressing header values.
The sample Axis2 server console will print a message indicating that it has received the request:

Thu May 20 12:25:01 IST 2010 samples.services.SimpleStockQuoteService :: Accepted order #1 for : 17621 stocks of IBM at $ 73.48068475255796