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title="Java SCA Runtime Component Hierarchy">Java SCA Runtime Component Hierarchy</A> + </TD> + + <TD align="right" valign="middle" class="topBarDiv" align="left" nowrap="true"> + <A href="http://mail-archives.apache.org/mod_mbox/tuscany-user">User List</A> | <A href="http://mail-archives.apache.org/mod_mbox/tuscany-dev">Dev List</A> | <A href="http://issues.apache.org/jira/browse/Tuscany">Issue Tracker</A> + </TD> + </TR> + </TABLE> + <!-- breadCrumbs macro end --> + + + <TABLE border="0" cellpadding="0" width="100%" bgcolor="#FFFFFF"> + <TR> + <TD align="left" valign="top"> + + <!-- pageContent macro --> + <DIV id="PageContent"> + + <DIV class="pagecontent"> + <DIV class="wiki-content"> + <H2><A name="JavaSCARuntimeComponentHierarchy-Theassmeblydiagram"></A>The assmebly diagram</H2> + +<P><SPAN class="image-wrap" style=""><IMG src="java-sca-runtime-component-hierarchy.data/recursive_composite.jpg" style="border: 0px solid black"></SPAN></P> +<DIV class="code panel" style="background-color: #ffffff;border-color: #6699ff;border-style: solid;border-width: 1px;"><DIV class="codeHeader panelHeader" style="border-bottom-width: 1px;border-bottom-style: solid;border-bottom-color: #6699ff;background-color: #D5EFFF;"><B>Composite1</B></DIV><DIV class="codeContent panelContent" style="background-color: #ffffff;"> +<PRE class="code-java"> +<composite xmlns=<SPAN class="code-quote">"http:<SPAN class="code-comment">//www.osoa.org/xmlns/sca/1.0"</SPAN> +</SPAN> targetNamespace=<SPAN class="code-quote">"http:<SPAN class="code-comment">//sample"</SPAN> +</SPAN> xmlns:sample=<SPAN class="code-quote">"http:<SPAN class="code-comment">//sample"</SPAN> +</SPAN> name=<SPAN class="code-quote">"Composite1"</SPAN>> + + <component name=<SPAN class="code-quote">"ComponentA"</SPAN>> + <implementation.java class=<SPAN class="code-quote">"sample.ComponentAImpl"</SPAN>/> + </component> + + <component name=<SPAN class="code-quote">"ComponentB"</SPAN>> + <!-- Implemented by Composite3 --> + <implementation.composite name=<SPAN class="code-quote">"sample:Composite3"</SPAN>/> + + <!-- Wired to ComponentA --> + <reference name=<SPAN class="code-quote">"Reference1"</SPAN> target=<SPAN class="code-quote">"ComponentA"</SPAN>/> + + <property name=<SPAN class="code-quote">"Property1"</SPAN>>ABC</property> + </component> + + <!-- ComponentB.Service1 is promoted --> + <service name=<SPAN class="code-quote">"Service1"</SPAN> promote=<SPAN class="code-quote">"ComponentB/Service1"</SPAN> /> + +</composite> +</PRE> +</DIV></DIV> +<DIV class="code panel" style="background-color: #ffffff;border-color: #6699ff;border-style: solid;border-width: 1px;"><DIV class="codeHeader panelHeader" style="border-bottom-width: 1px;border-bottom-style: solid;border-bottom-color: #6699ff;background-color: #D5EFFF;"><B>Composite2</B></DIV><DIV class="codeContent panelContent" style="background-color: #ffffff;"> +<PRE class="code-java"> +<composite xmlns=<SPAN class="code-quote">"http:<SPAN class="code-comment">//www.osoa.org/xmlns/sca/1.0"</SPAN> targetNamespace=<SPAN class="code-quote">"http://sample"</SPAN> xmlns:sample=<SPAN class="code-quote">"http://sample"</SPAN> +</SPAN> name=<SPAN class="code-quote">"Composite2"</SPAN>> + + <component name=<SPAN class="code-quote">"ComponentC"</SPAN>> + <implementation.java class=<SPAN class="code-quote">"sample.ComponentAImpl"</SPAN> /> + + <!-- Wired to ComponentD.Service1 --> + <reference name=<SPAN class="code-quote">"Reference1"</SPAN> target=<SPAN class="code-quote">"ComponentD/Service1"</SPAN> /> + </component> + + <component name=<SPAN class="code-quote">"ComponentD"</SPAN>> + <!-- Implemented by Composite3 --> + <implementation.composite name=<SPAN class="code-quote">"sample:Composite3"</SPAN> /> + + <!-- The property value is <SPAN class="code-quote">"XYZ"</SPAN> --> + <property name=<SPAN class="code-quote">"Property1"</SPAN>>XYZ</property> + </component> + + <!-- ComponentD.Reference1 is promoted --> + <reference name=<SPAN class="code-quote">"Reference1"</SPAN> promote=<SPAN class="code-quote">"ComponentD/Reference1"</SPAN> /> + +</composite> +</PRE> +</DIV></DIV> +<DIV class="code panel" style="background-color: #ffffff;border-color: #6699ff;border-style: solid;border-width: 1px;"><DIV class="codeHeader panelHeader" style="border-bottom-width: 1px;border-bottom-style: solid;border-bottom-color: #6699ff;background-color: #D5EFFF;"><B>Composite3</B></DIV><DIV class="codeContent panelContent" style="background-color: #ffffff;"> +<PRE class="code-java"> +<composite xmlns=<SPAN class="code-quote">"http:<SPAN class="code-comment">//www.osoa.org/xmlns/sca/1.0"</SPAN> targetNamespace=<SPAN class="code-quote">"http://sample"</SPAN> xmlns:sample=<SPAN class="code-quote">"http://sample"</SPAN> +</SPAN> xmlns:xsd=<SPAN class="code-quote">"http:<SPAN class="code-comment">//www.w3.org/2001/XMLSchema"</SPAN> name=<SPAN class="code-quote">"Composite3"</SPAN>> +</SPAN> + <component name=<SPAN class="code-quote">"ComponentE"</SPAN>> + <implementation.java class=<SPAN class="code-quote">"sample.ComponentEImpl"</SPAN> /> + <reference name=<SPAN class="code-quote">"Reference1"</SPAN> target=<SPAN class="code-quote">"ComponentF/Service1"</SPAN> /> + + <!-- The property is from the composite Property1 --> + <property name=<SPAN class="code-quote">"Property1"</SPAN> source=<SPAN class="code-quote">"$Property1"</SPAN> /> + </component> + + <component name=<SPAN class="code-quote">"ComponentF"</SPAN>> + <implementation.java class=<SPAN class="code-quote">"sample.ComponentFImpl"</SPAN> /> + </component> + + <service name=<SPAN class="code-quote">"Service1"</SPAN> promote=<SPAN class="code-quote">"ComponentE/Service1"</SPAN> /> + + <reference name=<SPAN class="code-quote">"Reference1"</SPAN> promote=<SPAN class="code-quote">"ComponentF/Reference1"</SPAN>> + <binding.sca /> + </reference> + + <property name=<SPAN class="code-quote">"Property1"</SPAN> type=<SPAN class="code-quote">"xsd:string"</SPAN>>123</property> + +</composite> +</PRE> +</DIV></DIV> +<P>1) Two components are implemented by the same composite<BR> + <BR> +Path a: Composite1.ComponentB is implemented by Composite3<BR> +Path b: Composite2.ComponentD is implemented by Composite3<BR> + <BR> +The service/reference can be promoted to different things:<BR> + <BR> +a: the final target for the ComponentF.Reference1 is Composite1.ComponentA<BR> +b: the final target for the ComponentF.Reference1 is Composite1.Reference1 (pointing to an external service)<BR> + <BR> +The property can be set to different value following different composition path:<BR> + <BR> +a: Composite3.ComponentE.Property1 is overrided by Composite1.ComponentB.Property1 (say value="ABC")<BR> +b: Composite3.ComponentE.Property1 is overrided by Composite2.ComponentD.Property1 (say value="XYZ")<BR> + <BR> +To represent the fully-configured components, we need to clone the model for Composite3 for Path a and b so that it can be used to hold different resolved values.</P> + + +<DIV class="panel" style="background-color: #ffffff;border-color: #6699ff;border-style: solid;border-width: 1px;"><DIV class="panelHeader" style="border-bottom-width: 1px;border-bottom-style: solid;border-bottom-color: #6699ff;background-color: #D5EFFF;"><B>Runtime Wires</B></DIV><DIV class="panelContent" style="background-color: #ffffff;"> +<P>Hi,</P> + +<P>I'm trying to indentify all the paths of SCA component interactions which <BR> +require to have runtime wires/invocation chains.</P> + +<P>By the SCA spec, there are three cases for the wiring:</P> + +<P>1) Component.Reference (A.ref1) -<DEL>is wired to</DEL>-> Component.Service (B.svc1)<BR> +--------------------------------------------------------------------------------------------------<BR> +1.1) If both the service and reference are defined by non-composite <BR> +components, then the runtime wire is as simple as A.ref1-->B.svc1.</P> + +<P>1.2) If the service is defined on a composite component, then it can be <BR> +further resolved to the orginal atomic component service following the <BR> +service promotion chain.</P> + +<P>For example, A.ref1 --> B.svc1 (B is implemented by another composite and <BR> +B.svc1 promotes C.svc1), then the runtime wire will be: A.ref1 --> C.svc1</P> + +<P>1.3) If the reference is defined on a composite component, then it can be <BR> +further resolved to the orginal atomic component reference following the <BR> +reference promotion chain.</P> + +<P>For example, A.ref1 --> B.svc1 (A is implemented by another composite and <BR> +A.ref1 promotes C.ref1), then the runtime wire will be: C.ref1 --> B.svc1</P> + +<P>2) Composite.Reference (Composite1.ref1) -<DEL>promotes</DEL>-> Component.Reference <BR> +(B.ref1)<BR> +-----------------------------------------------------------------------------------------------------------------<BR> +If Composite1 is the top-level composite, and the B is a non-composite <BR> +component, then the runtime wire will be: B.ref1 --> Composite1.ref1</P> + +<P>If Composite1 is used to implement a component A in Composite2, then we need <BR> +to futher check if A.ref1 is promoted or wired until we hit the end of the <BR> +promotion chain. The final target will be either a composite reference or a <BR> +component service that the out-most reference is wired to. For example, if <BR> +A.ref1 is wired to D.svc1 in Composite2, then the runtime wire is B.ref1 --> <BR> +D.svc1. If A.ref1 is promoted by Composite2.ref1, then the runtime wire is <BR> +B.ref1 --> Composite2.ref1.</P> + +<P>If B is a composite component, then we need to find out the final component <BR> +reference that B.ref1 promotes. For example, it promotes D.ref1, then the <BR> +runtime wire is D.ref1 --> C.ref1</P> + +<P>3) Composite.Service (Composite1.svc1) -<DEL>promotes</DEL>-> Component.Service <BR> +(A.svc1)<BR> +-----------------------------------------------------------------------------------------------------------<BR> +The source will be the outmost service on the promotion chain. For example, <BR> +if Composite2.svc1 promotes B.svc1 and B is implemented by Composite1, then <BR> +it is Composite2.svc1.</P> + +<P>The target will be the innermost service on the promotion chain. For <BR> +example, if A is implemented by Composite3 and Composite3.svc1 promotes <BR> +C.svc1, then it is C.svc1.</P> + +<UL> + <LI>Please note, due to the spec limitation, the composite service cannot<BR> +promote a composite reference directly.</LI> +</UL> + + +<P>Based on the above scenarios, it seems that we can create runtime wires <BR> +using the following algorithm (assuming multiplicity = 1..1). The key is to <BR> +get a final list of targets and selected bindings.</P> + +<P>1) Runtime wire for references: For each of the references (r1) on <BR> +non-composite components, find the outmost reference (r0) on the reference <BR> +promotion chain. Then get the targets and selected bindings from r0. If SCA <BR> +binding is used for a target, it can be further optimized to use the <BR> +orginally promoted component service. The runtime wire should be created <BR> +between the r1 and a target (either a component service with SCA binding or <BR> +a reference binding) from r0.</P> + +<P>2) Runtime wire for service promotions: For each of the service1 (s1) on <BR> +non-composite components, find the outmost service (s0, can be the same as <BR> +s1) on the service promotion chain. Create a runtime wire between the <BR> +selected binding of s0 and the component that defines s1. (Can we assume <BR> +that s1 is always local to s0?)</P> + +<P>The service/reference promotions make the picture complicated. I hope my <BR> +thought makes sense.</P> + +<P>Thanks,<BR> +Raymond</P> +</DIV></DIV> + +<DIV class="code panel" style="background-color: #ffffff;border-color: #6699ff;border-style: solid;border-width: 1px;"><DIV class="codeHeader panelHeader" style="border-bottom-width: 1px;border-bottom-style: solid;border-bottom-color: #6699ff;background-color: #D5EFFF;"><B>Runtime Context Interfaces</B></DIV><DIV class="codeContent panelContent" style="background-color: #ffffff;"> +<PRE class="code-java"> +<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">interface</SPAN> RuntimeContext<M> <SPAN class="code-keyword">extends</SPAN> Lifecycle { + /** + * Create an intercetor <SPAN class="code-keyword">for</SPAN> 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 <SPAN class="code-keyword">for</SPAN> calling the implementation logic <SPAN class="code-keyword">for</SPAN> 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 <SPAN class="code-keyword">if</SPAN> the operation is <SPAN class="code-keyword">for</SPAN> the callback + * @<SPAN class="code-keyword">return</SPAN> An interceptor that handles the invocation logic, <SPAN class="code-keyword">null</SPAN> should be returned <SPAN class="code-keyword">if</SPAN> no + * interceptor is required + */ + Interceptor createInterceptor(M model, Operation operation, <SPAN class="code-object">boolean</SPAN> isCallback); + + /** + * Get the effective <SPAN class="code-keyword">interface</SPAN> contract imposed by the binding or implementation. For + * example, it will be <SPAN class="code-keyword">interface</SPAN> contract introspected from the WSDL portType used by the + * endpoint <SPAN class="code-keyword">for</SPAN> a WebService binding. + * @param model The model object + * + * @<SPAN class="code-keyword">return</SPAN> The effective <SPAN class="code-keyword">interface</SPAN> contract + */ + InterfaceContract getEffectiveInterfaceContract(M model); +} + +<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">interface</SPAN> ReferenceBindingContext <SPAN class="code-keyword">extends</SPAN> RuntimeContext<Reference> { + /** + * @param wire + */ + void setRuntimeWire(RuntimeWire wire); + /** + * @<SPAN class="code-keyword">return</SPAN> + */ + RuntimeWire getWire(); +} + +<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">interface</SPAN> ServiceBindingContext <SPAN class="code-keyword">extends</SPAN> RuntimeContext<Service> { + /** + * @param wire + */ + void setRuntimeWire(RuntimeWire wire); + /** + * @<SPAN class="code-keyword">return</SPAN> + */ + RuntimeWire getWire(); +} + +<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">interface</SPAN> ImplementationContext <SPAN class="code-keyword">extends</SPAN> RuntimeContext<Component> { +} +</PRE> +</DIV></DIV> + </DIV> + </DIV> + </DIV> + <!-- pageContent macro end --> + + </TD> + </TR> + </TABLE> + + <!-- footer macro --> + <SCRIPT src="http://www.google-analytics.com/urchin.js" type="text/javascript"> + </SCRIPT> + <SCRIPT type="text/javascript"> + _uacct = "UA-1174707-5"; + urchinTracker(); + </SCRIPT> + + <A href="http://www.statcounter.com/" target="_blank"><IMG src="http://c26.statcounter.com/counter.php?sc_project=2619156&java=0&security=94bd7e7d&invisible=0" alt="website stats" border="0"></A> + + <DIV class="footer"> + Copyright � 2003-2012, The Apache Software Foundation </BR> + Apache Tuscany and the Apache Tuscany project logo are trademarks of The Apache Software Foundation. + </DIV> + <!-- footer macro end --> + + </BODY> +</HTML> |