Following up on the series "SOA and Java" where we analyze the technologies available in the Java space to build service-oriented applications, let us look at the service description of the Service Layer among the different layers of Service Oriented Applications.

The most important aspect of a service is the service description. When Web Services is used as the implementation technology for SOA, the messages and operations of the web service is described by Web Services Description Language (WSDL).

Shown below is an example of the WSDL for the “Time Service” web service which includes the port, operations, and message types.

<?xml version="1.0" encoding="UTF-8"?> 

<definitions name="MyTimeService" 

  targetNamespace="urn:oracle-ws"

  xmlns:tns="urn:oracle-ws"

  xmlns="http://schemas.xmlsoap.org/wsdl/"

  xmlns:xsd="http://www.w3.org/2001/XMLSchema" 

  xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/">

<types/>

<message name="TimeService_getDateTime">

<part name="String_1" type="xsd:string"/></message>

<message name="TimeService_getDateTimeResponse">

<part name="result" type="xsd:string"/></message>

<portType name="TimeService">

<operation name="getDateTime" parameterOrder="String_1">

<input message="tns:TimeService_getDateTime"/>

<output message="tns:TimeService_getDateTimeResponse"/>

</operation>

</portType>

<binding name="TimeServiceBinding" type="tns:TimeService">

<operation name="getDateTime">

<input>

<soap:body

  encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"

  use="encoded"

  namespace="urn:oracle-ws"/>

</input>

<output>

  <soap:body

    encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"

    use="encoded"

    namespace="urn:oracle-ws"/>

</output>

<soap:operation soapAction=""/></operation>

<soap:binding

  transport="http://schemas.xmlsoap.org/soap/http" style="rpc"/>

</binding>

<service name="MyTimeService">

<port

  name="TimeServicePort"

  binding="tns:TimeServiceBinding">

  <soap:address location="REPLACE_WITH_ACTUAL_URL"/>

</port> 

</service> 

</definitions> 

Regardless of whether the Web Service based on the above WSDL is built using .Net technology or Java technology, it must support the operations and messages described in the WSDL.

Next in this series is, Building the Service Layer in Java

Binary Spectrum, a Microsoft Gold certified partner and a member of theSun Partner Advantage Programhas years of expertise in designing and developing custom software and integrated solutions, the services include various types of SOA implementations Enterprice Service Bus (ESB) implementations and Java Composite Application Platform Suite (CAPS) implementations, device integration and, help desk management, inventory and stock control, manufacturing requirement process, client appointment management, document reference and encyclopedia search engines.

If you are interested in outsourcing software development or would like to find out more about our services and offerings, please get in touch with us. You might want to send us a mail, or simply contact us at info@binaryspectrum.com. A senior member of our customer engagement team will get in touch with you within 24 hours.