[Owncloud] Fwd: Re: Usage of triggers: ok for OC apps or too risky ?

[Thomas Müller]

to the list as well .....

:-/

--- Original Nachricht ---
Betreff: Re: [Owncloud] Usage of triggers: ok for OC apps or too risky ?
Von: Arthur Schiwon <blizzz at owncloud.com>
An: "owncloud at kde.org" <owncloud at kde.org>
Datum: 30.07.2012 16:36


Hey,

it depends a bit on what is going to happen in the database. As long as 
no ownCloud-logic is bypassed by possible write-actions, it's fine i guess.

Cheers
Arthur

On 07/29/2012 02:13 PM, Christian Reiner wrote:
> Hello all,
> i plan to offer a live monitoring for the occurance of certain events inside
> an OC app. These events are already captured by that app, stored in the
> database and also offered via a hook. However, since OC is based on php inside
> a web server environment the users session is spread over several processes.
> I thought of using long polling ajax requests, but obviously want to prevent
> having to poll the database at fixed intervals. Instead, when trying to react
> more or less immediately on an event I have to react directly to the event.
> Since this event is captured inside another process two options arise:
> 1. inter process communication
> 2. using triggers inside the database engine
> Inter process comminucation is a great thing, however looking at the operating
> systems and the various approaches it seems unlikely to ger this working
> reliable outside unix like systems. On MS Windows there is no dbus, phps
> shared memory extension does not exist and named pipes are not available. I
> know there are only few installations of OC out there, but it would be a pitty
> to reduce the list of features on such systems anyway. So I think of using the
> second aproach: database triggers.
> To my surprise I read that triggers are supported by SQLite these days, and
> the 'real' database servers relevant here all do so as well. So apart from me
> having to implement and test that:
>
> does anyone here see a reason against using triggers in OC apps ?
>
> Thanks,
> Christian
>

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