Sample 56: Using a WSDL Endpoint as the Target Endpoint

Note that WSO2 EI is shipped with the following changes to what is mentioned in this documentation:

<PRODUCT_HOME>/repository/samples/ directory that includes all Integration profile samples is changed to <EI_HOME>/samples/service-bus/.
<PRODUCT_HOME>/repository/samples/resources/ directory that includes all artifacts related to the Integration profile samples is changed to <EI_HOME>/samples/service-bus/resources/.

Introduction

This sample demonstrates how you can use a WSDL endpoint as the target endpoint. The configuration in this sample uses a WSDL endpoint inside the send mediator. This WSDL endpoint extracts the target endpoint reference from the WSDL document specified in the configuration. In this configuration the WSDL document is specified as a URI.

Prerequisites

For a list of prerequisites, see Prerequisites to Start the ESB Samples.

Building the sample

The XML configuration for this sample is as follows:

<definitions xmlns="http://ws.apache.org/ns/synapse">
    <sequence name="main">
        <in>
            <send>
                <!-- get epr from the given wsdl -->
                <endpoint>
                    <wsdl uri="file:samples/service-bus/resources/proxy/sample_proxy_1.wsdl"
                          service="SimpleStockQuoteService" port="SimpleStockQuoteServiceHttpSoap11Endpoint"/>
                </endpoint>
            </send>
        </in>
        <out>
            <send/>
        </out>
    </sequence>
</definitions>

This configuration file synapse_sample_56.xml is available in the <ESB_HOME>/repository/samples directory.

To build the sample

Start the ESB with the sample 56 configuration. For instructions on starting a sample ESB configuration, see Starting the ESB with a sample configuration.

The operation log keeps running until the server starts, which usually takes several seconds. Wait until the server has fully booted up and displays a message similar to "WSO2 Carbon started in n seconds."
Start the Axis2 server. For instructions on starting the Axis2 server, see Starting the Axis2 server.
Deploy the back-end service SimpleStockQuoteService. For instructions on deploying sample back-end services, see Deploying sample back-end services.

Executing the sample

The sample client used here is the Stock Quote Client, which can operate in several modes. For further details on this sample client and its operation modes, see Stock Quote Client.

To execute the sample client

Run the following command from the <ESB_HOME>/samples/axis2Client directory.
```
ant stockquote -Dsymbol=IBM -Dmode=quote -Daddurl=http://localhost:8280
```

Analyzing the output

When the client is run, you will see the following output on the client console:

Standard :: Stock price = $95.26454380258552

According to synapse_sample_56.xml the WSDL endpoint inside the send mediator extracts the EPR from the WSDL document. Since WSDL documents can have many services and many ports inside each service, the service and port of the required endpoint has to be specified in the configuration via the service and port attributes respectively. When it comes to address endpoints, the QoS parameters for the endpoint can be specified in the configuration. An excerpt taken from sample_proxy_1.wsdl, which is the WSDL document used in synapse_sample_56.xml is given below.

<wsdl:service name="SimpleStockQuoteService">
   <wsdl:port name="SimpleStockQuoteServiceHttpSoap11Endpoint" binding="ns:SimpleStockQuoteServiceSoap11Binding">
            <soap:address location="http://localhost:9000/services/SimpleStockQuoteService.SimpleStockQuoteServiceHttpSoap11Endpoint"/>
   </wsdl:port>
   <wsdl:port name="SimpleStockQuoteServiceHttpSoap12Endpoint" binding="ns:SimpleStockQuoteServiceSoap12Binding">
            <soap12:address location="http://localhost:9000/services/SimpleStockQuoteService.SimpleStockQuoteServiceHttpSoap12Endpoint"/>
   </wsdl:port>
</wsdl:service>

According to the above WSDL, the service and port specified in the configuration refers to the endpoint address http://localhost:9000/services/SimpleStockQuoteService.SimpleStockQuoteServiceHttpSoap11Endpoint