Java SCA Runtime Component Hierarchy

<composite xmlns="http://www.osoa.org/xmlns/sca/1.0"
    targetNamespace="http://sample"
    xmlns:sample="http://sample"
    name="Composite1">

    <component name="ComponentA">
        <implementation.java class="sample.ComponentAImpl"/>
    </component>

    <component name="ComponentB">
        <!-- Implemented by Composite3 -->
        <implementation.composite name="sample:Composite3"/>

        <!-- Wired to ComponentA -->
        <reference name="Reference1" target="ComponentA"/>

        <property name="Property1">ABC</property>
    </component>

    <!-- ComponentB.Service1 is promoted -->
    <service name="Service1" promote="ComponentB/Service1" />

</composite>

<composite xmlns="http://www.osoa.org/xmlns/sca/1.0" targetNamespace="http://sample" xmlns:sample="http://sample"
    name="Composite2">

    <component name="ComponentC">
        <implementation.java class="sample.ComponentAImpl" />

        <!-- Wired to ComponentD.Service1 -->
        <reference name="Reference1" target="ComponentD/Service1" />
    </component>

    <component name="ComponentD">
        <!-- Implemented by Composite3 -->
        <implementation.composite name="sample:Composite3" />

        <!-- The property value is "XYZ" -->
        <property name="Property1">XYZ</property>
    </component>

    <!-- ComponentD.Reference1 is promoted -->
    <reference name="Reference1" promote="ComponentD/Reference1" />

</composite>

<composite xmlns="http://www.osoa.org/xmlns/sca/1.0" targetNamespace="http://sample" xmlns:sample="http://sample"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="Composite3">

    <component name="ComponentE">
        <implementation.java class="sample.ComponentEImpl" />
        <reference name="Reference1" target="ComponentF/Service1" />

        <!-- The property is from the composite Property1 -->
        <property name="Property1" source="$Property1" />
    </component>

    <component name="ComponentF">
        <implementation.java class="sample.ComponentFImpl" />
    </component>

    <service name="Service1" promote="ComponentE/Service1" />

    <reference name="Reference1" promote="ComponentF/Reference1">
        <binding.sca />
    </reference>

    <property name="Property1" type="xsd:string">123</property>

</composite>

public interface RuntimeContext<M> extends Lifecycle {
    /**
     * Create an intercetor for the model in the invocation chain. For a reference binding,
     * the interceptor is responsible to make the outbound invocation over the binding protocol.
     * For a service binding, the interceptor is responsible to dispatch the incoming call to
     * the target component service that the service promotes. For a component implementation,
     * the interceptor will be responsible for calling the implementation logic for the given
     * component.
     * 
     * @param model The service that defines the binding
     * @param operation The operation that the interceptor will handle
     * @param isCallback A flag to tell if the operation is for the callback
     * @return An interceptor that handles the invocation logic, null should be returned if no 
     * interceptor is required
     */
    Interceptor createInterceptor(M model, Operation operation, boolean isCallback);
    
    /**
     * Get the effective interface contract imposed by the binding or implementation. For
     * example, it will be interface contract introspected from the WSDL portType used by the
     * endpoint for a WebService binding.
     * @param model The model object
     * 
     * @return The effective interface contract
     */
    InterfaceContract getEffectiveInterfaceContract(M model);
}

public interface ReferenceBindingContext extends RuntimeContext<Reference> {
    /**
     * @param wire
     */
    void setRuntimeWire(RuntimeWire wire);
    /**
     * @return
     */
    RuntimeWire getWire();    
}

public interface ServiceBindingContext extends RuntimeContext<Service> {
    /**
     * @param wire
     */
    void setRuntimeWire(RuntimeWire wire);
    /**
     * @return
     */
    RuntimeWire getWire();    
}

public interface ImplementationContext extends RuntimeContext<Component> {
}