Listing 2:

public class CreditApprovalImpl implements CreditRequest {
    public DataObject calulateCreditScore(DataObject creditApp) {

ServiceManager serviceManager = new ServiceManager();

BOFactory bof =
(BOFactory)serviceManager.locateService("com/ibm/websphere/bo/BOFactory");
DataObject creditRating = bof.create("http://CreditApproval", "CreditRating");
creditRating.setString("customerId", creditApp.getString("customerId"));

    creditRating.setInt("creditScore", 750);
    creditRating.setDouble("creditLimit", 10000d);
    return creditRating;
   }

}

In this implementation class, we use the CreditApplication input to create a simple CreditRating business object that we then return to the caller.

A service component is defined in a Service Component Definition Language (SCDL) file. A component file created with SCDL is roughly analogous to an EJB deployment descriptor, in that it defines the interface, implementation, and several qualities of service requirements of an SCA component. The SCDL file for the Java classes above would look like this:

Listing 3:

<?xml version="1.0" encoding="UTF-8"?>
<scdl:component xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:java="http://www.ibm.com/xmlns/prod/websphere/scdl/java/6.0.0" xmlns:ns1=
"http://CreditApproval/CreditRequest"
xmlns:scdl="http://www.ibm.com/xmlns/prod/websphere/scdl/6.0.0"
xmlns:wsdl="http://www.ibm.com/xmlns/prod/websphere/scdl/wsdl/6.0.0"
displayName="CreditApproval" name="CreditApproval">
   <interfaces>
     <interface xsi:type="java:JavaInterface" interface="CreditRequest " >
     <method name="calulateCreditScore"/>
    </interface>
   </interfaces>
   <implementation xsi:type="java:JavaImplementation" class=" CreditApprovalImpl"/>
</scdl:component>

Similarly, we could have used WSDL to represent the interface as shown here:

Listing 4:

<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions xmlns:bons1="http://CreditApproval"
xmlns:tns="http://CreditApproval/CreditRequest"
xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="CreditRequest"
targetNamespace="http://CreditApproval/CreditRequest">
  <wsdl:types>
    <xsd:schema targetNamespace="http://CreditApproval/CreditRequest"
	xmlns:bons1="http://CreditApproval"
	xmlns:tns="http://CreditApproval/CreditRequest"
	xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <xsd:import namespace="http://CreditApproval"
	  schemaLocation="xsd-includes/http.CreditApproval.xsd"/>
      <xsd:element name="calulateCreditScore">
        <xsd:complexType>
          <xsd:sequence>
            <xsd:element name="CreditApp" nillable="true"
			type="bons1:CreditApp"/>
          </xsd:sequence>
        </xsd:complexType>
      </xsd:element>
      <xsd:element name="calulateCreditScoreResponse">
        <xsd:complexType>
          <xsd:sequence>
            <xsd:element name="CreditRating" nillable="true"
			type="bons1:CreditRating"/>
          </xsd:sequence>
        </xsd:complexType>
      </xsd:element>
    </xsd:schema>
  </wsdl:types>
    <wsdl:message name="calulateCreditScoreRequestMsg">
    <wsdl:part element="tns:calulateCreditScore"
	name="calulateCreditScoreParameters"/>
  </wsdl:message>
    <wsdl:message name="calulateCreditScoreResponseMsg">
    <wsdl:part element="tns:calulateCreditScoreResponse"
	name="calulateCreditScoreResult"/>
  </wsdl:message>
    <wsdl:portType name="CreditRequest">
    <wsdl:operation name="calulateCreditScore">
      <wsdl:input message="tns:calulateCreditScoreRequestMsg"
	  name="calulateCreditScoreRequest"/>
      <wsdl:output message="tns:calulateCreditScoreResponseMsg"
	  name="calulateCreditScoreResponse"/>
    </wsdl:operation>
  </wsdl:portType>
</wsdl:definitions>

Our SCDL file would bind the interface to a WSDL document:

Listing 5:

<?xml version="1.0" encoding="UTF-8"?>
<scdl:component xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:java="http://www.ibm.com/xmlns/prod/websphere/scdl/java/6.0.0"
xmlns:ns1="http://CreditApproval/CreditRequest"
xmlns:scdl="http://www.ibm.com/xmlns/prod/websphere/scdl/6.0.0"
xmlns:wsdl="http://www.ibm.com/xmlns/prod/websphere/scdl/wsdl/6.0.0"
displayName="CreditApproval" name="CreditApproval">
  <interfaces>
    <interface xsi:type="wsdl:WSDLPortType" portType="ns1:CreditRequest">
      <method name="calulateCreditScore"/>
    </interface>
  </interfaces>
  <implementation xsi:type="java:JavaImplementation" class="CreditApprovalImpl"/>
</scdl:component>