Re: Interfaces in Forte - has anyone used them?

We are making use of interfaces extensively and have never had the
slightest problem. Interfaces do not cause any overhead, since they are
mainly a means to support type checking by the compiler. At run-time the
interface does not appear any more.
Using Forte 3.0.F.2
General wrote:
>
We are embarking on the analysis phase of a large pay/personnel project. =
We have been advised to use interfaces wherever possible, because they =
promote flexibility and reusability. I am fairly well convinced of the =
benefits of using interfaces - they appear to have a lot of advantages, =
and no drawbacks. However, I do wonder whether Forte's implementation of =
interfaces is stable and usable (..it was only introduced in version 3). =
If not, we may be better advised to use standard techniques.
If you have used Forte interfaces I would be interested to hear how you =
got on.
regards,
Tim Kimber--
Dr. Thomas Kunst mailto:[email protected]
sd&m GmbH & Co. KG http://www.sdm.de
software design & management
Thomas-Dehler-Str. 27, 81737 Muenchen, Germany
Tel +49 89 63812-221 Fax -444
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Eric,
You are correct, "manipulate anAIFace object" is not really the correct
way of thinking about what is happening. We are really manipulating an
instance of an object through an interface.
In regards to your other statement: "if Project C needs visibility to B,
it must have B as a supplier Plan." Forte does not force this to happen
when you are using interfaces, which is what causes the problem. Let me
expand on my initial example and add enough detail so that you can create
the problem, which surfaces as a deserialization error:
Project A (No Supplier Plans)
Defines Interfaces: UnitIFace with method GetValue() which returns an
integer
Project B (Contains A as a Supplier Plan)
Defines Class: Unit with attribute _Value as an integer and method
GetValue() which returns _Value. Implements interface UnitIFace.
Project C (Contains A as a Supplier Plan)
Defines Class: Square with method Calculate which accepts an
UnitIFace as an input parameter and returns an integer. This class needs
to be setup as a distributed object so that I service object can be
defined using this class.
Defines Service Object: SqaureSO using the Square class.
Project D (Contains B and C as Supplier Plans)
Defines a class or uses a window that creates an instance of Class B
and passes it to the SquareSO service object that sqaures the value and
returns an integer.
Once this is setup, use the running man to run everything locally. This
will run fine because the dependencies for the local partition end up
including Projects A, B, C and D. Next, run distributed and move the SO
to a remote partition. Now when you execute you will receive a
deserialization error. This happens because the dependencies for the
remote partition only included project A and C. The partition did not
have the necessary information to deserialize the underlying instance of
Class Unit that is referenced through the inteface UnitIFace.
The problem can be resolved by either adding Project B as a supplier plan
to Project C or ensuring that the interface and class are declared in the
same project as I suggested in my previous message. In either case, this
must be resolved by the programmer since Forte is not yet smart enough to
correctly resolve the project dependencies, even though all of the
information needed to establish the correct dependency hierarchy is
available.
Bradley K Wells
[email protected]
Strong Capital Management, Inc
http://www.strong-funds.com/
From: Eric Pereira
Sent: Friday, July 31, 1998 5:57 PM
To: [email protected]
Cc: [email protected]
Subject: RE: Interfaces in Forte - has anyone used them?
Bradley,
Thanks for that descriptive note on interfaces.
I do have a observation : in that example you gave us, if Project C
needs visibility to B, it must have B as a supplier Plan. Therefore, I
don't quite understand how partioning classes in C would end up with a
run-time errror in distributed mode, given that B supplies C (something
you've perhaps missed out in your example ?).
Also, is it really possible to "manipulate AIFace objects" ? Interfaces
are'nt really objects, they just help implement a compile-time type
check.
Thanks.
Eric Pereira
Forte Consultant
----<snip>------------------
Example:
Project A - Contains AIFace
Project B - Contains Class B which implements AIFace, depends on Project
A
Project C - Contains Classes manipulating AIFace objects, depends on
Project A
This can run fine locally since the local partition has knowledge of all
the classes in A, B, and C. Now as soon as you throw a service object
on
classes on Project C and push them into a remote partition, your
application starts failing because that partition does not contain the
information form project B since there is no dependency on that project.
The partition needs the information from project B though since it
contains the definitions for the actual implementation objects, however
there was no way for Forte to determine that need when it generated the
partition.
This problem is initially eliminated by keeping the interfaces in the
same project as the underlying business objects. But once you start to
have interfaces implemented by multiple classes from multiple projects,
then this won't cover all the bases either. In any case, it is an issue
that you will need to consider at some level when using interfaces.
Good luck!
Bradley K Wells
[email protected]
Strong Capital Management, Inc
http://www.strong-funds.com/
From: "Ngai, Stuart" <[email protected]>
Date: Thu, 30 Jul 1998 11:10:50 -0400
Subject: RE: Interfaces in Forte - has anyone used them?
With version 3G, you can not create an array of interfaces. I believe
Forte
will have that feature in version 4 (which is scheduled to be in
production
at the end of next year).
-----Original Message-----
From: Thomas Kunst [SMTP:[email protected]]
Sent: Thursday, July 30, 1998 8:52 AM
To: [email protected]
Cc: General
Subject: Re: Interfaces in Forte - has anyone used them?
We are making use of interfaces extensively and have never had the
slightest problem. Interfaces do not cause any overhead, since theyare
mainly a means to support type checking by the compiler. At run-timethe
interface does not appear any more.
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Service objects inside libraries (WAS: Interfaces in Forte -has anyon

The following message is actually not about interfaces, but libraries:
> From: Jeanne Hesler <[email protected]>
> To: [email protected] <[email protected]>
> Date: Thursday, July 30, 1998 11:12 AM
> Subject: RE: Interfaces in Forte - has anyone used them?
>>
> Just to clarify a few things:
>>
1) Just to be 100% correct -- it is actually Libraries that areloaded and
not Interfaces. The distinction is important because a librarycould
potentially implement many interfaces (or provide manyimplementations for a
single interface).
2) The code in a Library may reference a service object, but itmay not
define a service object. Of course any SO's referenced by thelibrary
must already be known to the loading partition. It is OK to havecode like
this in a library:
MySO.doSomething();
The documentation is a little vague on this point, but I haveconfirmed that
this is true through Tech Support and by experimentation.
Actually you CAN define and use service objects inside libraries
(compiled or interpreted) with two restrictions:
1) You can not define two service objects inside library in different
projects and call one of them from another. If you need that, both
service objects must be in the same project.
2) If service object is defined and used only by library (if it never
referenced directly by application code), than in order to be able to
partition application, you will need to create dummy method inside
application, which will reference this service object (you do not need
to execute this method - just have in the code).
WBR,
Nickolay Sakharov.
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The way stateful Web services are currently handled is through the use of cookies ... once your stub invokes a stateful Web service a cookie is created which routes subseqent requests back to the Web service.
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(Below are my words)
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Send this to:
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Re: Interfaces in Forte - has anyone used them?

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