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From conflue...@apache.org
Subject [CONF] Apache Tuscany: SCA Java definitions.xml (page created)
Date Fri, 01 Aug 2008 12:23:01 GMT
SCA Java definitions.xml (TUSCANY) created by Simon Laws
   http://cwiki.apache.org/confluence/display/TUSCANY/SCA+Java+definitions.xml

Content:
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h1. defnitions.xml

Section 1.8 describes the definitions.xml file as holding all of the artifacts that are useful
for configuring an SCA domain but that are not specific to a particular composite or component.
It goes on to say that "All of these artifacts within and SCA Domain are defined in a global,
SCA Domain-wide file named definitions.xml". To achieve our extensibility goals we, in Tuscany,
consider the SCA Domain wide definitions.xml file to be a logical concept that is constructed
at runtime from the contents of definitions.xml files provided in contributions and in Tuscany
extensions. 

Each definitions.xml file may contain.

* Intents
* Policy sets
* Predefined binding specifications
* Binding type descriptions
* Implementation type descriptions

h2. Complete Features

h3. Add Intents and Policy Sets with an Extension

An extension, such as the modules/policy-security extension relies on some policy sets and
intents being available in the SCA Domain. The definitions.xml is the place to define these
and hence if you look in this extension module you will find the following. 

{code}
<definitions xmlns="http://www.osoa.org/xmlns/sca/1.0"
 			targetNamespace="http://www.osoa.org/xmlns/sca/1.0"
 			xmlns:sca="http://www.osoa.org/xmlns/sca/1.0"
 			xmlns:tuscany="http://tuscany.apache.org/xmlns/sca/1.0">

    <!-- POLICY SETS -->
    <policySet name="runAs" appliesTo="sca:implementation.java"/>
    <policySet name="allow" appliesTo="sca:implementation.java"/>
    <policySet name="rolesAllowed" appliesTo="sca:implementation.java"/>
    <policySet name="permitAll" appliesTo="sca:implementation.java"/>
    <policySet name="denyAll" appliesTo="sca:implementation.java"/>
    
	<!-- Policy Intents Defined by the SCA Runtime -->
	<intent name="authentication" 
	 		constrains="sca:binding">
		<description>
			Specifying this intent on references requires necessary authentication information
			to be sent along with outgoing messages. Specifying this intent on service requires
			incoming messages to be authenticated
		</description>
	</intent>
	
	<intent name="confidentiality" 
	 		constrains="sca:binding">
		<description>
			Specifying this intent requires message exchanged to be encrypted
		</description>
	</intent>
	
	<intent name="integrity" 
	 		constrains="sca:binding">
		<description>
			Specifying this intent requires message exchanged to be signed
		</description>
	</intent>
</definitions>
{code}

When this module is loaded at runtime the contents of this file are made generally available
and hence in you composite you can use statements such at. 

{code}

<component name="CalculatorServiceComponent">
    <implementation.java class="calculator.CalculatorServiceImpl"/>
    <reference name="addService" >
        <interface.java interface="calculator.AddService" />        
        <binding.ws uri="http://localhost:8080/sample-calculator-ws-secure-webapp/AddServiceComponent"
                    requires="authentication" />        
    </reference>
</component>
{code}

h2. TODO Features

h3. 

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