I'm currently designing a dependency injection solution for use within
application state objects that I'd also like to use elsewhere in my
application.
The idea is simple - I have a set of services that I need to use throughout
the app for which I don't want to be passing references around.
A good example is the Vlib sample that ships with Tap4. Taking a look at
the Visit object, it requires an IRequestCycle object to be passed in to get
the current user - I'd like to do away with this.
// Copied from Vlib - Visit.java
// Don't want to be passing this around!
public Person getUser(IRequestCycle cycle)
{
...
VirtualLibraryEngine vengine = (VirtualLibraryEngine) cycle.getEngine();
_user = vengine.readPerson(_userId);
...
}
What I'd like to do is simply annotate my Visit object and, with the right
HiveMind configuration, have it retrieve a request specific reference to
necessary application services.
Something like the following (additional notes inline):
public class Visit implements Serializable {
/*
* This should retrieve an object created or retrieved
* from a pool and bound to the current request (thread).
* AppServices will have injected objects of its own
* (references to EJBs, etc.)
*/
@InjectObject("service:myapp.services")
public abstract AppServices getAppServices()
{
}
}
Any idea on how to get this to work properly and efficiently (including the
nested HiveMind annotations within AppServices)?
-Lance
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