Hello again.
Having trouble with FortressServiceManager/Selector again.
Okay, in my roles file I have this:
<role name="com.company.component.RoleInterface">
<component shorthand="componentOne"
class="com.company.component.ImplOne"
handler="org.apache.avalon.fortress.impl.handler.FactoryComponentHandler"/>
<component shorthand="componentTwo"
class="com.company.component.ImplTwo"
handler="org.apache.avalon.fortress.impl.handler.FactoryComponentHandler"/>
</role>
First off, is this valid? It sure appears to be.
Yes.
So now we turn to the container's configuration file:
<componentOne id="one"> <config>stuff</config> </componentOne>
<componentTwo id="two"> <config>stuff</config> </componentTwo>
Now, if I use the service manager to lookup the role "com.company.component.RoleInterface" or RoleInterface.ROLE, I should get a ServiceSelector, correct? In other words:
Object o = m_serviceManager.lookup(RoleInterface.ROLE);
No. That gets you the default implementation.
the object 'o' should be a ServiceSelector since I have two different components of the same role. Instead, I'm getting 'o' as a proxy for the "ImplOne" object. So in order for me to get an "ImplTwo" object, I have to do something like this:
Object o = m_serviceManager.lookup(RoleInterface.ROLE+"/componentTwo");
Right. And if you want the selector, you need to do this:
Object o = m_serviceManager.lookup(RoleInterface.ROLE+"Selector");
(See the Developing with Avalon whitepaper for the documented convention).
This is done to allow easier migration from ECM based projects where you had to simply *know* which roles were accessible via selector or not. This way your components are more portable.
Is this the way it's supposed to work? I'm fairly certain that the first example should return a ServiceSelector since I have two components defined for the same Role. Perhaps I misunderstand the "contracts" of the ServiceManager, so if anyone has some insight, I'd appriciate it.
You just forgot to specify the selector with the +"Selector" idiom.
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