On Tue, 01 May 2012 11:58:28 +0300, Nemo <n...@lsub.org> wrote:
On Apr 30, 2012, at 11:54 PM, aram wrote:
Hi,
i explore the UI of octopus and i try to understand how omero notifies
the viewers for events.
It is apparent from the documentation that the viewers "read" events
from the ui/olive file.
However, when i cat that file from the shell and "play" with a terminal
a bit, i get no data.
The terminals are updated correctly which indicates that the events are
delivered.
I checked the source of olive (port/live/live.b) and it simply reads
(by calling updateproc(fd)) the file as expected.
Obviously i am missing something important that the documentation does
not cover.
How can i read events posted by omero?
Thanks
There are two type of events. IIRC.
User events like open, exec, ... are posted via o/ports, and you can
read them from there.
Yes, i receive successfully events targeted to applications (o/mero:.*).
However ...
UI events are sent through a file with a protocol for o/live.
(Time ago they were sent also through ports, but I think I changed that).
The viewer reads a tree and then gets updates from that file.
That's internal and I don't think the man page describes that.
... i am interested for this ^^. In mero.b these events are described as
# Events:
# from o/mero to o/live (via merop):
# "Tupdate file data"
# "Ctl top"
# "Ctl ins tag vers pos string"
# "Ctl del tag vers pos string"
I want to be able to listen precisely these events.
I assume by "the viewer reads a tree and then gets updates from that file"
you mean that the /mnt/ui/olive file is read?
I checked the viewers code again, and it does not do anything strange or
cryptic. The fact that bothers me is that by executing
% cat olive
I receive nothing, whereas by executing
% touch /mnt/ports/listen_app_events
% echo 'o/mero:.*' > listen_app_events
% cat listen_app_events
i receive application events (exec, close, ets) just fine.
I can take a look to the source so I remember if you don't have luck
with these hints.
hth
Thanks for your time.
--
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