Hi Dishara, I don't think you can use RDATE for the implementing recurrences. For example, it would be impossible to describe an endless recurrence without untill date at all.
As Maxim already wrote, the main problem is database. Its structure should allow: - Create/update/delete recurrence events - Detect which recurrence instances appears in the given period of time - Allow to modify all the instances, one instance or a tail of the instances (the third case is actually optional - AFAIK not all the calendar applications support this-and-after recurrences, and this case is not strongly specified in RFC 2445). - Allow to have recurrence exceptions, i.e. to remove single instance in the recurrence chain Additionally, you would need to take into account time zone differences problems from the very beginning. Say, if user with time zone A invited user with time zone B to the daily meeting, and DST periods are different for A and B, it's not trivial how to calculate start time of the events on each day. Anyway, I would suggest to start from thinking about the database structure - how recurrence rules would be stored in the OpenMeetings database and how they can be queried from there. It seems like if the event is recurrent, recurrence rules should be stored in some separate table which does not present currently in OpenMeetings database. Best regards, Irina. On Tue, Mar 26, 2013 at 6:14 PM, Dishara Wijewardana < ddwijeward...@gmail.com> wrote: > Hi Irina, > Sorry for the late reply since I was not well in last couple of day. I was > able to set up ical4j and tested locally with all following mentioned > aspects with the API, relating to recurrence events. > > i.e > - Created an event (VEvent) for a given day/for a given period of > time (Monday 1PM - 4PM) > - Added attendees to the event > - Added Recurrence Rule for the event in different combinations > (WEEKLY(specified days only with a starting day for the week), DAILY,HOURLY > along with a given interval/setUntil and etc) > - Created a ical4j Calendar and added the previously created VEvent. > - And tried calculating the recurrence set with a given period of > time with different combinations. > > And those helped me to get familiar a bit with the ical4j API. > > So in terms of this project, I am +1 for using RRule for implementing > recurrence events using ical4j. We can also use sequence of dates (RDATE) > for the same purpose. But I have not tried that yet. Please let me know if > there is any advantage you already know using RDATE over RRule for this > particular purpose. Seems RRule is much cleaner and made for this purpose. > > On Fri, Mar 22, 2013 at 7:22 AM, Dishara Wijewardana < > ddwijeward...@gmail.com> wrote: > > > > > > > On Thu, Mar 21, 2013 at 10:44 PM, Irina Arkhipets < > > irina.arkhip...@gmail.com> wrote: > > > >> Dishara, > >> > >> Yes, moreover - this library is already used in OpenMeetings. > >> > >> Wonderful.. In fact I have created an eclipse project and was able to > > build the trunk.I will look in to this ical4j API and get an > understanding > > of how this can be incorporated to this project implementation. And thank > > you for pointing out the ical4j. > > > > > >> Regards, > >> Irina. > >> > >> On Thu, Mar 21, 2013 at 10:49 PM, Dishara Wijewardana < > >> ddwijeward...@gmail.com> wrote: > >> > >> > On Thu, Mar 21, 2013 at 11:23 AM, Irina Arkhipets < > >> > irina.arkhip...@gmail.com > >> > > wrote: > >> > > >> > > Hi Dishara, > >> > > > >> > > FYI: you can try ical4j library for your project as it already > >> implements > >> > > required recurrence models for java. > >> > > > >> > > >> > Hi Irina, > >> > This seems pretty good indeed. I also saw quite a few positive > feedbacks > >> > for them. Before digging in to this, can we ship this as a dependency > >> under > >> > Apache License 2 ? > >> > Please refer [1]. > >> > > >> > [1] - http://build.mnode.org/projects/ical4j/license.html > >> > > >> > > > >> > > https://sourceforge.net/projects/ical4j/ > >> > > > >> > > Best regards, > >> > > Irina. > >> > > > >> > > On Wed, Mar 20, 2013 at 12:41 AM, Dishara Wijewardana < > >> > > ddwijeward...@gmail.com> wrote: > >> > > > >> > > > Hi all, > >> > > > This is regarding the JIRA [1] created for one of the GSoC 2013 > >> project > >> > > > ideas. And I am moving the discussion regarding $subject at [1] to > >> open > >> > > > meeting dev list. > >> > > > > >> > > > Just a small brief of my self to the mailing list: I am Dishara > >> > > Wijewardana > >> > > > who is interested in contributing to Apache projects and I have > >> > > > successfully completed my last year GSoC (2012) in Apache Velocity > >> > > project > >> > > > and there I implemented a complete JSR 223 API support for > velocity. > >> > And > >> > > > willing to take part in GSoC this year with Apache OpenMeetings. > >> > > > > >> > > > Hi Irina, > >> > > > It seems that what you basically mentioned on [1] are the > >> fundamental > >> > > facts > >> > > > from iCalendar Specification which is related to recurrence events > >> > > > implementation. But I will start looking in to the spec [2] to > get a > >> > > better > >> > > > understanding and meanwhile will checkout the code and build it > >> first > >> > of > >> > > > all, and hopefully find a way in to the Open Meetings code base > ;-). > >> > Will > >> > > > post If I encounter any issues. > >> > > > > >> > > > [1] - https://issues.apache.org/jira/browse/OPENMEETINGS-549 > >> > > > [2] - http://www.ietf.org/rfc/rfc2445.txt > >> > > > > >> > > > -- > >> > > > Thanks > >> > > > /Dishara > >> > > > > >> > > > >> > > >> > > >> > > >> > -- > >> > Thanks > >> > /Dishara > >> > > >> > > > > > > > > -- > > Thanks > > /Dishara > > > > > > -- > Thanks > /Dishara >
