Re: [Oorexx-devel] Serializable updates

[Rick M. <obj...@gm...>]

On Tue, Oct 20, 2009 at 2:57 PM, Moritz Hoffmann <ant...@gm...> wrote:
> [Sending mail didn't seem to work - retrying...]

I saw both versions of your mail.

>
> Hi,
> I started working on the Serializable class again. I hope to get it to
> improve it a lot, as it has some severe problems right now :-) The
> examples in the incubator will not work using the latest version, I will
> update that stepwise.
>
> What I want to change is that objects need to be serialized explicitly
> rather than just being able to serialize a single object. Thus, any
> class that should be serialized has to offer a readObject and
> writeObject method:
>
> ::CLASS "SerTest" MIXINCLASS Serializable PUBLIC
> ::ATTRIBUTE o
>
> ::METHOD readObject
>     expose o
>     use arg handler
>     o = handler~readObject
>
> ::METHOD writeObject
>     expose o
>     use arg handler
>     handler~writeObject(o)
>
> The methods can use readObject and writeObject provided by the
> serialization handler to save and restore the objects. This is the how
> serialization works in Java, for example.
>
> The new version uses 4.0 features for resolving classes. It also removes
> the custom handlers for rexx internal classes - in future I want all
> classes to serialize themselves. This is still a point where we can have
> a choice on how to implement it.
>
> Maybe one of you gives me a hint where to start for
> designing/implementing the internal class' serialization code. I also
> want to find out, if more methods like
> read/write(Logical|Number|whatever) should be added to the handler.

I suspect many of the serialization methods can be more easily
implemented using Rexx code rather than C++ methods.  See the front of
the CoreClasses.orx file for some examples of how these types of
methods are added to classes that have been implemented primarily in
C++ code.  For example, the set-like methods that are used by the
collection classes.

Rick

>
> Kind regards,
> Moritz
>
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