Raymond, HelloworldDelegateComponent and HelloworldDelegateComponent2 are using the implementation class sample.HelloworldDelegateImpl. Both these components are invoking a service from HelloworldXComponent which uses implementation class sample.HelloworldImpl. Each of these components are using a single instance per component of the respective implementation classes through out the scope of the composite. Let us say 1. HelloworldDelegateComponent is using instance A of HelloworldDelegateImpl 2. HelloworldDelegateComponent2 is using instance B of HelloworldDelegateImpl 3. HelloworldXComponent is using instance C of HelloworldImpl.
The problem is that a) when A is invoking service from C, C.callback should be injected with the callback service provided by A and b) when B is invoking service from C, C.callback should be injected with the callback service provided by B Even though it is one instance of HelloworldImpl that is used, the callback field should keep changing depending on who is invoking the service. Don't know if it is feasible. On Thu, Feb 5, 2009 at 12:49 AM, Raymond Feng <[email protected]> wrote: > Hi, > > This is interesting. In your case, you have two components > HelloworldDelegateComponent and HelloworldDelegateComponent2 that use the > same java implementation class: sample.HelloworldImpl which is composite > scoped. Now the question is how to interpret the following statement in the > SCA java spec: > > 295 1.2.4.3. Composite scope > 296 All service requests are dispatched to the same implementation instance > for the lifetime of the containing > 297 composite. The lifetime of the containing composite is defined as the > time it becomes active in the runtime > 298 to the time it is deactivated, either normally or abnormally. > > There are two ways: > > 1) There is going to be one instance of sample.HelloworldImpl (A) that are > shared by HelloworldDelegateComponent and HelloworldDelegateComponent2. > Requests to both components will be dispatched to A. > > 2) There are going to be two instances of sample.HelloworldImpl (A & B), > one for HelloworldDelegateComponent and the other for > HelloworldDelegateComponent2. Request to HelloworldDelegateComponent will be > dispatched to A while requests to HelloworldDelegateComponent2 will be > dispatched B. > > It seems that Tuscany works in the 1st way. We need clarifications from the > spec group. > > Thanks, > Raymond > > From: Vamsavardhana Reddy > Sent: Wednesday, February 04, 2009 8:30 AM > To: [email protected] > Subject: Callback problem with COMPOSITE scoped implementation > > > > I have a composite with three components as given below: > > <composite xmlns="http://www.osoa.org/xmlns/sca/1.0"; > targetNamespace="http://sample"; > name="HelloworldDelegate"> > > <component name="HelloworldXComponent"> > <implementation.java class="sample.HelloworldImpl"/> > </component> > > <component name="HelloworldDelegateComponent"> > <implementation.java class="sample.HelloworldDelegateImpl"/> > <service name="HelloworldDelegate"> > <binding.ws uri=" > http://localhost:8080/tuscany/HelloworldDelegate"/> > </service> > <reference name="helloworld" target="HelloworldXComponent"/> > <property name="salutation">Monsieur</property> > </component> > > <component name="HelloworldDelegateComponent2"> > <implementation.java class="sample.HelloworldDelegateImpl"/> > <service name="HelloworldDelegate"> > <binding.ws uri=" > http://localhost:8080/tuscany/HelloworldDelegate2"/> > </service> > <reference name="helloworld" target="HelloworldXComponent"/> > <property name="salutation">Mr.</property> > </component> > </composite> > > HelloworldImpl provides a Helloworld service and requires a > HelloworldCallback callback service. > HelloworldDelegateImpl provides HelloworldDelegate service and > HelloworldCallback service. There are two components, namely > HelloworldDelegateComponent (with salutation "Monsieur") and > HelloworldDelegateComponent2 (with salutation "Mr."). Both these components > invoke Helloworld service provided by HelloworldXComponent. > Both the implementations are COMPOSITE scoped. > > When I use the HelloworldDelegate service from HelloworldDelegateComponent > the output I see in the console is the following: > HelloworldDelegateComponent: > HelloworldDelegateImpl(sample.helloworlddelegatei...@28e2f1).sayHello: > vamsi > HelloworldXComponent: > HelloworldImpl(sample.helloworldi...@10076aa).sayHello: > vamsi > HelloworldDelegateComponent: > HelloworldDelegateImpl(sample.helloworlddelegatei...@28e2f1).whoIs: vamsi > > and the message got back is "Hello Monsieur vamsi". > ------------------------------ > When I use the HelloworldDelegate service from HelloworldDelegateComponent > the output I see in the console is the following: > HelloworldDelegateComponent2: > HelloworldDelegateImpl(sample.helloworlddelegatei...@146e74b).sayHello: > vamsi > HelloworldXComponent: > HelloworldImpl(sample.helloworldi...@10076aa).sayHello: > vamsi > HelloworldDelegateComponent: > HelloworldDelegateImpl(sample.helloworlddelegatei...@28e2f1).whoIs: vamsi > > and the message got back is "Hello Monsieur vamsi". I was expecting "Hello > Mr. vamsi". > > Notice that in the second case, the callback service is called from > HelloworldDelegateComponent instead of HelloworldDelegateComponent2. Is this > the expected behaviour? > ----------------- > > If I make HelloworldImpl as STATELESS scoped (which is the default), then I > am seeing that the callback service is invoked on the same component that is > invoking the Helloworld service. The following is the output: > > HelloworldDelegateComponent: > HelloworldDelegateImpl(sample.helloworlddelegatei...@1c704a7).sayHello: > vamsi > HelloworldXComponent: HelloworldImpl(sample.helloworldi...@1af0f92).sayHello: > vamsi > HelloworldDelegateComponent: > HelloworldDelegateImpl(sample.helloworlddelegatei...@1c704a7).whoIs: vamsi > Hello Monsieur vamsi > > HelloworldDelegateComponent2: > HelloworldDelegateImpl(sample.helloworlddelegatei...@61dec0).sayHello: > vamsi > HelloworldXComponent: HelloworldImpl(sample.helloworldi...@4f3d72).sayHello: > vamsi > HelloworldDelegateComponent2: > HelloworldDelegateImpl(sample.helloworlddelegatei...@61dec0).whoIs: vamsi > Hello Mr. vamsi > > What am I missing? > > ++Vamsi > -- Vamsi
