Jason: I'll admit I was unable to figure out exactly what Shindig's
approach is, exactly, unfortunately. However there is definitely more
than one way to skin this cat. My current implementation an Action, a
Result and a Handler for each operation. This does result in some
class proliferation, but has the upside of having everything nicely
self-contained.
In my implementation, I actually have a 'Dispatch' class which can be
injected directly, and a separate DispatchServiceServlet which is also
injected the same Dispatch instance and provides access from GWT/RPC.
To hold you over while I get the code sorted, here is a simple example
of what an action/result/handler looks like:
It's just a concrete implementation of ActionHandler. Essentially,
each Action/Result has a single ActionHandler that does the actual
execution on the server side.
getActionType() returns the concrete Action subclass that the handler
supports. For example, a 'Get User' operation might look like this:
public class GetUser implements Action<GetUserResult> {
private String name;
// For serialization
GetUser() {}
public GetUser( String name ) {
this.name = name;
}
public String getName() {
return name;
}
}
public class GetUserResult implements Result {
private User user;
// Serialization
GetUserResult() {}
public GetUserResult( User user ) {
this.user = user;
}
public User getUser() {
return user;
}
}
// This class is server-side only
public GetUserHandler implements ActionHandler<GetUser, GetUserResult>
{
private final UserDAO dao;
@Inject
public GetUserHandler( UserDAO dao ) {
this.dao = dao;
}
public Class<GetUser> getActionType() {
return GetUser.class;
}
public GetUserResult execute( GetUser action ) throws Exception {
return new GetUserResult( dao.getUser( action.getName() ) );
}
}
A very simple example, and the actual 'getting' code is wrapped in the
DAO in this case. It could equally be coded directly in, or hooking up
to a non-DB service. Depends how you want to implement it.
David
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