[fdo-internals] Please review RFC 66

[Greg Boone]

Thanks Dave. I was thinking along these lines as well. We can implement such a wrapper solution within the FDO Implementation.

Greg

-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org [mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of David Wilbur
Sent: Friday, April 26, 2013 10:15 AM
To: FDO Internals Mail List
Subject: Re: [fdo-internals] Please review RFC 66

Below is the rough pattern for allowing managed implementations of unmanaged interfaces, it requires an UnmanagedWrapper implementation:


----- Unmanaged

class IUnmanagedInterface
{
   virtual SomeMethod()
}

class UnmanagedInterfaceManager
{
   RegisterInterface(IUnmanagedInterface interface)
   { 
     // actually register somehow, add to list, use the interface, etc.
   }
}


----- Mixed wrapper implementation of the interface, simply forwards to the managed reference

class UnmanagedWrapper : IUnmanagedInterface {
   UnmanagedWrapper(managedInterface) { _managedInterface = managedInterface }

   SomeMethod() { _managedInterface.SomeMethod() } // forward to the managed implementation }


----- Managed API

interface IManagedInterface
{
   SomeMethod()
}

class ManagedInterfaceManager
{
   RegisterInterface(IManagedInterface interface)
   {
       UnmanagedWrapper wrapper = new UnmanagedWrapper(plugin);
       UnmanagedInterfaceManager.RegisterInterface(wrapper);
   }
}
       

-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org [mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Christine Bao
Sent: Thursday, April 25, 2013 11:53 PM
To: FDO Internals Mail List
Subject: Re: [fdo-internals] Please review RFC 66

Hi Jackie, 

No, the .NET mgFdoCoordinateSystemTransform is not possible to be override and take effect. I agree with you that this API should not be exposed in .NET side. 

The detail of why .NET API cannot be override can refer to previous discussion.

Thanks & regards,
Christine

-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org [mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Jackie Ng
Sent: Friday, April 26, 2013 12:50 PM
To: fdo-internals at lists.osgeo.org
Subject: Re: [fdo-internals] Please review RFC 66

Is it even possible to override .net FDO classes?

Because that's the only way I could see us taking advantage of such APIs in the .net side. If we can't plug in a custom fully managed implementation of FdoCoordinateSystemTransform into this API, then there isn't much value in exposing this API to the .net side.

- Jackie



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