Re: Future of Prevayler?

Of course,  sorry I wasn't clearer.   I am building a desktop app btw, so my needs may seem different than others.

There are two basic 'types' of transactions, fully journaled to disk and 'memory only' (which is really just a null serializer I think).   For large transactions like batch loading or fully hypothetical data sets, I would like to switch out the transaction journaler on the fly.  I would also like to flush and lock.  In other words,  I can do it myself, but it's alway better through the system.

By flush and lock, I mean that I want the current journal shut down, and the system locked to new transactions except for the one I am about to call.

Here is me making stuff up : 

// Finish transactions, flush the current journal and return a lock when you are done.
Object lock = prevSystem.flushAndLock();
if (lock != null) {
	prevSystem.turnOffTransactionSerialization();
	
	// prevSystem will is locked and will reject any execute requests that don't have the lock object
	prevSystem.execute( new LongRunningBatchTransaction(), lock );
	
	// Back to normal
	prevSystem.turnOnTransationSerialization();
	
	// Capture what you did
	prevSystem.snapShot();

	// Should be in a finally() or shut down on error.
	prevSystem.unlock(lock);
}

// Now the batch work is done and we are ready to go back to normal work

On Apr 15, 2010, at 3:34 PM, William Pietri wrote:

> On 04/15/2010 03:01 PM, Ross Rick wrote:
>> A way to convert from disk to memory transactions and back without restarting the prevalent system.
> 
> Could you say more about this? I understood the rest, but I don't get 
> this one.
> 
> William
> 
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------------------------------------------------------------------------------
Download Intel® Parallel Studio Eval
Try the new software tools for yourself. Speed compiling, find bugs
proactively, and fine-tune applications for parallel performance.
See why Intel Parallel Studio got high marks during beta.
http://p.sf.net/sfu/intel-sw-dev
_______________________________________________
To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion
_______________________________________________
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