Re: [ojb-users] Long Transactions

[Thomas M. <tho...@ho...>]

Hi Stephan,

I'm not sure about your application scenario. Please give some more 
detail on what you want to do!

Stephan Merker wrote:
> Hello,
> 
> can anybody give me a hint what'ts the right way to perform long
> transactions using OJB with the ODMG API?
> 
> E.g.
> 
> - Client requests an object  by sending a request to the server
> - server performs OQL query = 1st transaction
> - object is send to client

2nd tx must be opened and unmodified object must be locked in WRITE mode 
here!

> - client modifies object
> - client sends object back to server
> - server performs update = 2nd transaction
> 
> How-to perform the update? I tried Transaction.lock(obj, Transaction.WRITE)
> but then the object is not written because the dirty check is performed
> against the object passed to the lock() method and not against the state of
> the persistent object (in the database or cache).
> 

The object must be locked *before* the client can perform modifications!
It's no problem to hold long ODMG transaction, as they do not consume DB 
resources (OJB provides a db independent tx isolation mechanism)!

cheers,

Thomas

> Any ideas?
> 
> Thanks,
> Stephan
> 
> 
> 
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