I'm new to Guice and am stumped right now as how to properly use
Guice's facilities to accomplish what I need.
The situation, simplified:
- A depends on B and C
- B and C depend on D
- I'd like B and C to share a D since what D is providing is expensive
to compute and will be the same for both B and C.
+--> [ B ]--+
[ A ]---| |---> [ D ]
+--> [ C ]--+
- Each time my service S is called, it uses a graph of objects shaped
like this to respond to the request.
This code is running running in s Spring container. The servlet-class
is configured to HttpRequestHandlerServlet. The service itself is
running as an HttpInvokerServiceExporter. (I'm new to Sping too,
though others in my team have more experience with it.) The whole mess
is running on JBoss.
What I'd like:
Every time I handled a call to my service, I request a new from A the
injector. This gets me a new B and a new C. It also gets me two new
Ds, but I only want one to avoid repeated work.
(A, B, C are stateless, but D is mutable and use-once-per-request.)
D as Singleton scope is not what I want since this would reuse D
across multiple service calls. I *guess* what I want is for D to be in
Request Scope and A, B, C to be unscoped, but I don't understand how
to accomplish this. I'm too much of a noob.
I've read the docs on Scopes on the guice homepage and I'm going back
over the relevant sections in Google Guice book from APress, but I'm
not groking it yet.
As a stop-gap I'm just declaring D as sigleton, but constructing a new
injector for each call. This is expensive, though not prohibitively so
because the module is not all that complex. I'm sure there's a better
way. Please enlighten me!
thanks,
Ben
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