Sanjeev Fly weight and Value object are totally different. One is GOF
pattern and other is j2ee pattern . later is now called DTO. As the name
implies, it is used to transfer data across different tiers in coarse form
to overcome the network calls. Fly weight pattern is used when application
is using large no of ||ar object which differ only in certain respect.

take the case of simple editor. Each letter is represented by say a
object.Now when you are typing letter 'a' very often it only differs with
others only wrt its position. So instead of creating new instance for each
'a' , I will put this in some sort of common pool and while displaying it ,
I will pass some information (here the position). This way you can save the
memory and overhead associated with the creation of the object. For more
details refer to GOF book.

/Ashwani

> -----Original Message-----
> From: Sanjiv Kapila [mailto:skapila@(protected)]
> Sent: Tuesday, August 21, 2001 11:52 AM
> To: J2EEPATTERNS-INTEREST@(protected)
> Subject: Flyweight vs Value Object
>
>
> Can any one highlight me pros & cons of Flyweight vs Value
> Object paatern.
> As per my understanding Flyweight calls for dividing the
> result or their
> transfer across n/w in smaller bunched to avoid overloading
> whereas value
> object clubs diff. request in one to save multiple calls over network.
>
> Also I would like to know code snippet for making a flyweight
> pattern i.e.
> segregating a resulset in multiple bunches. I know we have
> fetchSize() that
> can define the no of records to fetch but how to indicate
> that pointer for
> starting record. Also what will happen if during this
> fetching some new
> records are inserted in the requested table?
>
> Regards
> Sanjiv
>
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