Phil Lewis wrote:
<snip>
The problem is that the MyClassEJBFactory creates an instance of the remote
interface using MyClassHome. When I try to fave the MyClassEJBFactory return
the remote interface, I get a compile time error saying that the factory
method
needs to return MyClassBusiness.
</snip>
This seems a bit strange to me, as I'm doing something very similar in some
benchmark code that I've written, where I have a number of beans that
implement the same interface with different implementations for
benchmarking.
Basically, I've implemented it as follows
// Business interface holds all business methods (a la Monson-Haefel, et
al)
public interface MyClassBusiness {
public method1()
...
}
// Remote Interface
public interface MyClass extends MyClassBusiness, javax.ejb.EJBObject {}
// Local version of same - could be an interface or a class
public interface MyClassLocal extends MyClassBusiness {}
public abstract class MyClassFactory {
public MyClassFactory() {};
public abstract MyClassBusiness create();
}
public MyClassEJBFactory extends MyClassFactory {
...
public MyClassBusiness create() {
return (myClassHome.create());
}
}
While I haven't tested this construction, I see no reason why the compiler
would complain about this since myClassHome.create() returns a MyClass
interface which IS a MyClassBusiness. Note that to make this work, you need
to put all your business methods in a separate interface which is inherited
by both MyClass and MyClassLocal a la Monson-Haefel. If your MyClass
interface extends MyClassBusiness, then your MyClassEJBFactory should be
able to cast MyClass interfaces to MyClassBusiness interfaces with impunity.
Note that this *does* mean that you lose the stuff in javax.ejb.EJBObject.
If this is a problem, then your local object needs to implement
javax.ejb.EJBObject as well, in which case MyClassFactory can return MyClass
interfaces instead of MyClassBusiness interfaces. Alternatively, you could
use run-time casting (yuck!), or implement a third interface which extends
MyClassBusiness with the methods from javax.ejb.EJBObject() that you
require...
Jeff 8-)
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