Setting codebase on a per entry basis....

Hi all,

I am having a little codebase issue and am looking for some
alternative viewpoints. My situation is as follows:

I have multiple processes using a Javaspace to communicate. One of the
Entries that is passing through the space can be considered to be a
kind of FactoryEntry. Its role is to allow a generic JavaSpace process
to create (and then write back into a Space) multiple instances of an
Entry whose parent type is well known. The process that is using the
FactoryEntry does not need to know the what type of Entry has actually
been created.

The generic process is able to retrieve and use the FactoryEntry in
the first instance because the codebase has been set properly by the
process that first placed the FactoryEntry into the space. The issue
is: how does the Generic process set the codebase for the new Entrys
that were created by the FactoryEntry?

One solution would be to ensure that the codebase of the generic
process always contains the details of any entry that it will ever
potentially see. This is not really feasible because it will involve
updating the codebase of many different generic processes everytime a
new Entry type is created. This will be an administrative nightmare.

What I really need is a way to programmatically set the codebase on a
per Entry basis as it is written into the Space.

It occurred to me that it might be possible to replace aspects of the
Marshalling code within the Jeri Exporter used by the Javaspace (most
notably MarshalOutputStreams and InvocationHandlers)  with code that
dynamically allows me to set the codebase based on the type of Entry
that is passing through. This would have the advantage in that I would
only have to change code in a few places (notably the proxys generated
by the Javaspace implementations I have deployed).

This was quickly a non starter - the MarshalOutputStreams, etc used by
the Jeri exporter are only for the PROXY - what I really need is a way
to be able to set the codebase INSIDE the proxy, not the codebase FOR
the proxy.

I am left with the feeling that there is no way to programmatically
set per Entry codebases without going inside the JavaSpace
implementation and making internal proxy/server changes..... am I
right in thinking this?

Cheers,

Ewan

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