[Neo] Event framework has landed

Atle Prange atle.prange at gmail.com
Thu Apr 29 11:46:47 CEST 2010


Really nice, but it seems that afterCommit() never receives any data, the
TransactionData argument is always null..

On Tue, Apr 27, 2010 at 10:15 AM, Mattias Persson <mattias at neotechnology.com
> wrote:

> Hi everyone!
>
> I'm quite pleased to announce that the new event framework has been
> committed in kernel 1.1-SNAPSHOT. After feedback from you guys the
> framework
> got quite small and cosy. Here's a summary.
>
> *TransactionEventHandler*
> can be registered at a GraphDatabaseService and will thereafter recieve
> diffs of modifications made in each transaction before and after they are
> committed. The transaction can still be modified in beforeCommit() and that
> method can also throw an exception to prevent the transaction from
> committing, causing a TransactionFailureException to be thrown from the
> code
> which is committing the transaction.
>
> *KernelEventHandler*
> can be registered at a GraphDatabaseService and will receive notifications
> about when a shutdown is about to occur for the GraphhDatabaseService
> instance. It will also receive notifications about "kernel panics" which is
> a state which the kernel can come to from where it cannot continue without
> needing to be restarted. An example of such an error would be a hard drive
> breakdown or when no more space is left on the device the graph database is
> running on.
>
> The next step is to write an "auto indexer" for the IndexService so that
> that you won't have to do the manual indexService.index( node, key, value )
> anymore. Another thing would be to remove (deprecate) the
> IndexService#shutdown() method as it no longer would be required.
>
> So it'd be great if you guys would try this out and tell us how it feels.
>
> --
> Mattias Persson, [mattias at neotechnology.com]
> Hacker, Neo Technology
> www.neotechnology.com
> _______________________________________________
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