On Mar 12, 2007, at 11:47 AM, Jeremy Boynes wrote:
On Mar 11, 2007, at 10:16 PM, Jeremy Boynes wrote:
Firstly, transporting Scope is not enough on its own as there is
more than one COMPOSITE scope. The builders used to get this from
the deployment context but with federation it will need to be
passed to in the PCD. I think instead we should treat
ScopeContainers as resources and give them IDs like ClassLoaders.
For COMPOSITE scope the ID can be the URI of the component
implemented by the composite; for others we can use well known
IDs. Every component has a scope so I think we can put
scopeContainerID down in to PCD itself.
Following on with this I'm going to make the following changes to
the ScopeContainer SPI to externalize the idea of a instance of a
scope i.e a ScopeContext:
* add methods startContext(Object id) and stopContext(Object id)
this will place external code in control of the lifecycle of the
scope context so that it can be initiated
by the code that dictates the lifecycle. This will allow us to
avoid having the container register for and
receive events just to detect context lifetime.
* change get and return wrapper to also pass the contextId
* add a Map<Scope, Object> to the WorkContext to associate scope
context ids with the current work
* update the target invoker to get wrappers based on the current
work context and the component's scope
Taking this a little further I think we need an additional mapping
here - a component group. This allows us to partition a Scope into
groups of component that support a common lifetime. The obvious
application for this is with COMPOSITE scope where there are a group
of components whose lifetime is tied to that of a composite; a more
subtle application would be in conjunction with an EAR deployment
where we want to relate HttpSession scoped components in different
web applications. This would also allow us to support eagerInit
semantics for scope types over and above COMPOSITE.
To support this I'm going to add another two method to
ScopeContainer: createComponentGroup(Object) and removeComponentGroup
(Object) and change the register/unregister methods to add a
component group id so that the container can associate the component
with the group.
--
Jeremy
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