Sample 800: Introduction to REST API

<!-- An empty flat synapse configuration shipped with the WSO2 ESB -->
<definitions xmlns="http://ws.apache.org/ns/synapse">
    <!-- You can add any flat sequences, endpoints, etc.. to this synapse.xml file if you do
    *not* want to keep the artifacts in several files -->
<api name="StockQuoteAPI" context="/stockquote">
   <resource uri-template="/view/{symbol}" methods="GET">
      <inSequence>
         <payloadFactory>
        <format>
        <m0:getQuote xmlns:m0="http://services.samples">
                <m0:request>
                   <m0:symbol>$1</m0:symbol>
                </m0:request>
             </m0:getQuote>
        </format>
        <args>
        <arg expression="get-property('uri.var.symbol')"/>
        </args>
     </payloadFactory>
     <send>
        <endpoint>
        <address uri="http://localhost:9000/services/SimpleStockQuoteService" format="soap11"/>
        </endpoint>
     </send>
      </inSequence>
      <outSequence>
     <send/>
      </outSequence>
   </resource>
   <resource url-pattern="/order/*" methods="POST">
      <inSequence>
        <property name="FORCE_SC_ACCEPTED" value="true" scope="axis2"/>
    <property name="OUT_ONLY" value="true"/>
    <send>
            <endpoint>
                <address uri="http://localhost:9000/services/SimpleStockQuoteService" format="soap11"/>
            </endpoint>
         </send>
      </inSequence>      
   </resource>
</api>
</definitions>

Objective:

Introduce the REST API support in WSO2 ESB..

Prerequisites:

You have to start the axis2 server and deploy the SimpleStockQuoteService.
Start the Synapse configuration numbered 800: wso2esb-samples.sh -sn 800
You need a REST client like curl to test this.

curl -v http://127.0.0.1:8280/stockquote/view/IBM

curl -v http://127.0.0.1:8280/stockquote/view/MSFT

The GET calls are handled by the first resource in the StockQuoteAPI. These REST calls will get converted into SOAP calls and sent to the Axis2 server. The response will be sent to the client in POX format.

The following command posts a simple XML to the ESB. Save the following sample request as "placeorder.xml" in your local file system and execute the command that is used to invoke a SOAP service. The ESB returns the 202 response back to the client.

curl -v -d @placeorder.xml -H "Content-type: application/xml" http://127.0.0.1:8280/stockquote/order/

<placeOrder xmlns="http://services.samples">
  <order>
     <price>50</price>
     <quantity>10</quantity>
     <symbol>IBM</symbol>
  </order>
</placeOrder>