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New Message on BDOTNET
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From: ArunNAndU
Message 1 in Discussion
Hi Raghvendra.
There was a time when
serialization was the term used to mean saving the object to disk as a
byte/binary file. But today we have more fine grain control as to what the
output format should be. So there are Object Serialization, XML Serialization etc.
generally clubbed under the name Object Persistence. Serialization is also done
for none storage purposes like network transfers.
Can't serialization be used to speed up data
access? Yes
definitely. That is what happens most of the time behind the scenes of a network
call or save of object to disk. More appropriately Object Serialization. But
limited to a language say Unmanaged C++ or IL. Each language defines the layout
of its class or object in memory. Hence within the language like all .NET
languages via IL or all C++ objects there is an easy or sometimes transparent
serialization process employed. But cross language it could be
challenging.
Can we serialize/de-serialize an object
to/from a stream of bytes and store it? ... Shoud it be always written in a
formatted file like xml... is there any other way?
Agreed,
frequent XML Parsing could be taxing. Hence XML Serialization is not
readily suited for disparate objects or any
object. But a proper object model could really benefit from a one time parse and
load concept. Furthermore. With pull parsing we have further optimized the
parsing business. Did you know MSXML parser is the fastest in the industry
:)
Having said that. Most of
the times it really is not a choice of developers to say "Come what may, I will
use XML Serialization" or something like that, it is purely requirement driven.
So evaluate your requirements and options carefully before making a
choice.
XML Serialization could
help over Object Serialization in object transfer across environments. But when
the requirement is object transfer within a language or environment, then we are
better off with object serialization.
Hope I have not confused
you more :).
Cheers!!!
Arun
-----Original Message-----
From: Raghavendra S
Naik [mailto:[EMAIL PROTECTED]
Sent: Monday, October 06,
2003 3:15 PM
To: Arun N. Kumar
Subject: RE: Serialization
across Virtual Machines
Hi Arun,
Thanx for your insight. I do think that encrypting the data stored is a better
way of doing things than changing the way things are stored. I did post
this question on BDOTNET. Could you kindly let me know where can i get
more info about your sessions on "XML Serialization".
There is some aspects that is not clear to
me ...
Can't serialization be used to speed up data
access?
i.e. If we use a memory image (binary byte
stream) of an object for storing data instead of reading from files with
formating (like in XML), which when read back, need parsing thus
increasing the time needed and also resources ... won't it be a better idea to
read back a binary byte stream and re-create an object? thus making it faster
(undermining the need to represent it in a standard format ... like
xml)?
Can we serialize/de-serialize an object
to/from a stream of bytes and store it? ... Shoud it be always written in
a formatted file like xml... is there any other way?
The main thing is that frequent xml parsing could be
very taxing.
Regards,
Raghavendra S Naik
>>> "Arun N. Kumar" <[EMAIL PROTECTED]> 10/06/03 12:58PM
>>>
Hi Raghavendra,
Yes, I had done a
couple of sessions on "XML DataBinding or XML Serialization ". But I would like to
add one more note.
In XML Serialization
the objects are converted to and from XML and the Sample used XML as the wire
format. Similar to SOAP. Since your requirement is not to use XML. I dont
think XML Serialization will help you directly.
Understanding "Object"
Serialization and Parsing them back into Java is possible but unadvisable, as
it is an internal representation and changes to either technologies breaks
your code.
There are many ways a
.NET app could talk to Java App. The best approach would be via XML and/or
SOAP due to advantages like simplicity, feasibility and availability of
tools to get this done quicker.
One solution to your
problem to stop snoopy eyes could be to encrypt the content. I feel this
approach would be better as it is foolproof. If you override the serialization
process or the ToString method and generate the same still you are vulnerable
to snoopers as your data is not secure.
Hope this helps. Would
be glad to help more. Post this on BDOTNET so others could also
benefit.
Cheers!!!
_____________________________
Arun N
Kumar<o:p></o:p>
Software
Architect
ZapApp India Private
Limited
Level G & 1,
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-----Original Message-----
From: Raghavendra S
Naik [mailto:[EMAIL PROTECTED]
Sent: Monday, October 06,
2003 12:02 PM
To: Arun N. Kumar
Subject: Serialization
across Virtual Machines
hi,<o:p></o:p>
I was referred to you by a colleague of mine who is also a member
of the BDOTNET group. I hope you could help me in figuring out a way to
"serialize an
object in .NET and de-serialize it in JAVA". <o:p></o:p>
<o:p></o:p>
The
catch is, XML/SOAP format
is not to be used. The serialized object
should be written in binary format. This is necessary to
avoid cognizance of the serialized data by an unauthorized person, which is
possible if the data is written in XML/SOAP format.<o:p></o:p>
<o:p></o:p>
Some methods that i could think of
were:
Use the existing .NET serialization mechanism to
write objects. Create a parser which de-serializes serialized
data written by .NET (for this, i need to know the exact method/format in
which .NET writes serialized objects
... Help needed!!!)
Override the way/format in which .NET serializes
objects ... so that the format of the serialized data is a custom format.
(can this be done?)
Your suggestions will be awaited.
Regards,
Raghu__________________________________________________
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