Object serialization

Luigi Paioro luigi at lambrate.inaf.it
Tue Feb 26 08:51:40 PST 2008

Thank you Simon...

> Encoding things for D-Bus in this way involves the same sort of design
> decisions you'd make when choosing how to encode something in JSON or XML.
> Now, if what you want is some sort of generic object storage/retrieval system,
> you have exactly the same issues as if you were doing generic object
> storage and retrieval using files on disk. You'll have to define a way to
> construct an object instance from a dictionary, struct or byte-array,
> enforcing use of a "safe" constructor that cannot crash or
> cause unwanted code to execute when it is fed invalid data, then have
> objects provide a method that dumps their state into such a format.


> I believe that attempting to "solve" this problem in a generic way, without
> having any particular use-case in mind, is likely to lead to a system that's
> not particularly useful for *any* use case.

Indeed. You have stricken the target. I do have a specific use case in 
mind that I already have partially implemented for a possible SOAP 
service (starting from a UML design). I'm dealing with a framework that 
should be able to exploit different RPC systems (at least at design 
level). One of them is SOAP, another is XML-RPC, and my team proposed 
also DBus.

So, what I have to do is to call a (remote) service passing a complex 
data structure as argument. This complex data structure should also be 
stored (serialized) in a file, but not necessarily. We can see it like 
an XML document exchanged in a SOAP communication, or an object encoded 
in JSON format and exchanged, for instance, via HTTP GET.

As I said above, I have already implemented this complex data model 
using XML for SOAP messaging and data storage in files, and now I'm 
trying to find a way to do the same for DBus (and XML-RPC... the data 
model serialization as a dictionary could follow the same rules I suppose).

I don't know whether you find it interesting or useful, but here you can 
get an example of this data model serialization as XML document instance:


Thank you again.


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