12 Dec
2013
12 Dec
'13
4:40 p.m.
Hi K
One of the simplest example of custom job started in a background
thread that needs acces to a usable XWikiContext/XWiii is probably
https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-core/xwi….
To summarize:
* you annotate your job component
@InstantiationStrategy(ComponentInstantiationStrategy.PER_LOOKUP) to
make it unique get call to getInstance()
* org.xwiki.context.concurrent.ExecutionContextRunnable wrapper is
taking care or initializing an ExecutionContext for that thread for
any Runnable
* you access the current XWikiContext where you need it ny injecting
the XWikiContext Provider
On Thu, Dec 12, 2013 at 3:35 PM, Lukáš Raška <lukas(a)raska.me> wrote:
Hi,
as discussed on IRC, I have trouble creating multiple simultaneous tasks
from inside component.
Creating new thread results in malformed context, which can result in
XWikiException.
This could probably be avoided using Jobs, but nobody seems to know how
exactly.
As of 5.1, it should be able to create custom jobs by extending
AbstractJob.
But how to get context inside that job? Could I use Provider in such way as
in ScriptWikiStreamConverterJob? (Multitaskness should be achieved with
InstantiationStrategy)
About what I need to achieve - component creating API for "videolibrary"
extension (converting video attachment in certaing page to web-playable
format using libav). Since it should be safe to use, attachment is
immediately copied to specified temp folder (filesystem) after uploading.
Old attachment is deleted to ensure we didn't convert same file twice
(there is no callback with filenames for html5 fileupload widget). After
this, video will be converted to specified format and attached to different
page (using InputStream?).
Is this idea safe to use? (or am I missing another possible problem?)
Thanks for replies
--
Best Regards
Lukas Raska
_______________________________________________
devs mailing list
devs(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/devs
--
Thomas Mortagne