In Hector framework, take a look at TimeUUIDUtils.java You can create a UUID using TimeUUIDUtils.getTimeUUID(long time); or TimeUUIDUtils.getTimeUUID(ClockResolution clock)
and later on, TimeUUIDUtils.getTimeFromUUID(..) or just UUID.timestamp(); There are some example in TimeUUIDUtilsTest.java Let me know if it helps. On Tue, Jan 4, 2011 at 10:27 AM, Roshan Dawrani <roshandawr...@gmail.com>wrote: > Hello Victor, > > It is actually not that I need the 2 UUIDs to be exactly same - they need > to be same timestamp wise. > > So, what I need is to extract the timestamp portion from a time UUID (say, > U1) and then later in the cycle, use the same long timestamp value to > re-create a UUID (say, U2) that is equivalent of the previous one in terms > of its timestamp portion - i.e., I should be able to give this U2 and filter > the data from a column family - and it should be same as if I had used the > original UUID U1. > > Does it make any more sense than before? Any way I can do that? > > rgds, > Roshan > > > On Tue, Jan 4, 2011 at 11:46 PM, Victor Kabdebon < > victor.kabde...@gmail.com> wrote: > >> Hello Roshan, >> >> Well it is normal to do not be able to get the exact same UUID from a >> timestamp, it is its purpose. >> When you create an UUID you have in fact two information : random 64 bits >> number - 64 bits timestamp. You put that together and you have your uuid. >> . >> So unless you save your random number two UUID for the same milli( or >> micro) second are different. >> >> Best regards, >> Victor K. >> http://www.voxnucleus.fr >> >> 2011/1/4 Roshan Dawrani <roshandawr...@gmail.com> >> >> Hi, >>> I am having a little difficulty converting a time UUID to its timestamp >>> equivalent and back. Can someone please help? >>> >>> Here is what I am trying. Is it not the right way to do it? >>> >>> =========================================================== >>> UUID someUUID = TimeUUIDUtils.getUniqueTimeUUIDinMillis(); >>> >>> long time = someUUID.timestamp(); /* convery from UUID to a long >>> timestamp */ >>> UUID otherUUID = TimeUUIDUtils.getTimeUUID(time); /* do the >>> reverse and get back the UUID from timestamp */ >>> >>> System.out.println(someUUID); /* someUUID and otherUUID should be >>> same, but are different */ >>> System.out.println(otherUUID); >>> =========================================================== >>> >>> -- >>> Roshan >>> Blog: http://roshandawrani.wordpress.com/ >>> Twitter: @roshandawrani <http://twitter.com/roshandawrani> >>> Skype: roshandawrani >>> >>> >> > > > -- > Roshan > Blog: http://roshandawrani.wordpress.com/ > Twitter: @roshandawrani <http://twitter.com/roshandawrani> > Skype: roshandawrani > > -- Patricio.-
