Re: [Prevayler-discussion] Soft and Weak Reference for prevayler idea

[Klaus W. <kla...@ya...>]

Hi Marconi,

With Prevayler you do need enough RAM to hold all your business objects. That can be a problem if
you don't have enough money to buy it.

Basically, what you are suggesting is we make Prevayler into an object-oriented database. Many
OODBMs already exist, though, and I am not going to implement yet another one. Variations on this
idea are suggested once a month on this list. Its OK.  :)

Welcome to the list.  :)

See you, Klaus.


--- Marconi Pereira Soldate <so...@bo...> wrote:
> I was reading about these types of references and
> they can solve three bigger problems that (I think) exist in prevayler.
> 
> 1) Keep everything in RAM requires a lot of RAM.
> Thousands of objects that are in memory can be only occupying memory space.
> 
> 2) Having thousand of objects in the memory, snapshot and the
> deserialization of the system seems to occupy a considerable time.
> 
> 3) During the re-execution of a transaction, problems can occur
> (Erros and RuntimesExceptions, right ?) that could leave a inconsistent
> system.
> Design the system on another way, the business objects could have weak
> references in way that, if are not being very used, the Garbage Colector
> could collect them.  When need them again, would be brought for the memory
> (task to be carried through by a subclass of Soft or Weak Reference).
> As the system would be designed I still does not know, but I am certain that
> it has a skill to implement this idea.
> 
> First, these cited problems really exist or I did not understand the
> system correctly?  This idea already was thought? It works ?
> 
> Thanks.
> 
> 
> Marconi
> 
> 
> 
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