Adding State

Adding State

In the first part of this tutorial we have created a stateless service for simplicity. However, the most common patterns used when developing gCube services are the ones that allow to create stateful service. In this part of the tutorial we see how to add a state to the SampleService.

Towards a multi port-type service

To add a state we need firstly to add two new port-types to the SampleService:

• one is dedicated to create a new stateful resource, the so-called Factory service port-type
• the other one is dedicated to access and manage the state, the so-called Service instance port-type

For both, we need to perform the same steps done for the Stateless port-type:

• add the port-types to the profile file
• define the WSDL interface for each port-type
• provide the Java implementation of the two port-types

plus other specific steps that allow to manage stateful services.

Defining the port-type interfaces

WSDL interface for the factory service

Create a new WSDL file, name it Factory.wsdl and place the file in the SERVICE/etc folder.

<?xml version="1.0" encoding="UTF-8"?>
<definitions name="Factory"
    targetNamespace="http://acme.org/sample"
    xmlns:tns="http://acme.org/sample"
  	xmlns="http://schemas.xmlsoap.org/wsdl/"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:corefaults="http://gcube-system.org/namespaces/common/core/faults"
    xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/03/addressing" >
    
    <import namespace="http://gcube-system.org/namespaces/common/core/faults" location="../gcube/common/core/faults/GCUBEFaults.wsdl"/>
   
 	<types>
	<xsd:schema targetNamespace="http://acme.org/sample">
		
		 <xsd:import namespace="http://schemas.xmlsoap.org/ws/2004/03/addressing" 
schemaLocation="../ws/addressing/WS-Addressing.xsd" />
	
  		<xsd:element name="logon" type="xsd:string" />		
		<xsd:element name="logonResponse" type="wsa:EndpointReferenceType"/>
	</xsd:schema>
	</types>

	<message name="logonInputMessage">
		<part name="request" element="tns:logon"/>
	</message>
	<message name="logonOutputMessage">
		<part name="response" element="tns:logonResponse"/>
	</message>

	<portType name="FactoryPortType">
	
		<operation name="logon">
			<input message="tns:logonInputMessage"/>
			<output message="tns:logonOutputMessage"/>
			<fault name="fault" message="corefaults:GCUBEFaultMessage"></fault>
			<fault name="fault" message="corefaults:GCUBEUnrecoverableFaultMessage"></fault>
			<fault name="fault" message="corefaults:GCUBERetrySameFaultMessage"></fault>
			<fault name="fault" message="corefaults:GCUBERetryEquivalentFaultMessage"></fault>
		</operation>
	
	</portType>

</definitions>

WSDL interface for the service instance

Create a new WSDL file, name it Stateful.wsdl and place the file in the SERVICE/etc folder.

<?xml version="1.0" encoding="UTF-8"?>
<definitions name="Stateful"
    targetNamespace="http://acme.org/sample"
    xmlns:tns="http://acme.org/sample"
  	xmlns="http://schemas.xmlsoap.org/wsdl/"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:coretypes="http://gcube-system.org/namespaces/common/core/types"
    xmlns:corefaults="http://gcube-system.org/namespaces/common/core/faults">
    
    <import namespace="http://gcube-system.org/namespaces/common/core/faults" 
location="../gcube/common/core/faults/GCUBEFaults.wsdl"/>
    
 	<types>
	<xsd:schema targetNamespace="http://acme.org/sample">    	
	    <xsd:import namespace="http://gcube-system.org/namespaces/common/core/types" 
schemaLocation="../gcube/common/core/types/GCUBETypes.xsd"/>
	    	
  		<xsd:element name="aboutSF" type="coretypes:VOID" />
		<xsd:element name="aboutSFResponse" type="xsd:string" />				        
                    
	</xsd:schema>
	</types>

	<message name="aboutSFInputMessage">
		<part name="request" element="tns:aboutSF"/>
	</message>
	<message name="aboutSFOutputMessage">
		<part name="response" element="tns:aboutSFResponse"/>
	</message>

	<portType name="StatefulPortType">        
	
		<operation name="aboutSF">
			<input message="tns:aboutSFInputMessage"/>
			<output message="tns:aboutSFOutputMessage"/>
			<fault name="fault" message="corefaults:GCUBEFaultMessage"></fault>
		</operation>	
	
	</portType>

</definitions>

A Test Client

--Manuele.simi 23:59, 25 March 2008 (EET)