Hi Brett, thanks for the hint to your project. I did not know it before.
However, I would like to see a proof (i.e. a short explanation is sufficient) how you intend to solve the problem I have mentioned. Running code is no proof :-) For some reasons I strongly doubt that your code (or any possible code) can handle this without changes to the C/S protocol. Your application seems to be different anyway. If I am not mistaken (I just read the wave you mentioned) you are running a web client which connects to your web server which connects to FedOne. Right? The problem I mentioned is between your web server and FedOne. In my case it is between QWaveClient and FedOne. Your web app can of course recover as long as FedOne and your web server are stable. But what happens if your WebServer crashes in an unfortunate moment? Your code will suffer from the very problem I described. However, would like to be proven wrong here since this would give me a solution to my initial problem :-) Greetings Torben 2010/1/20 Brett Morgan <[email protected]> > Actually, no, OT deals with this case. My almost working code that I > presented at LCA2010 deals with this edge case. Unfortunately it has bugs, > and dies in the arse randomly. Sigh. > > Wave that I presented from: > https://wave.google.com/wave/#restored:wave:googlewave.com!w%252BTBvx4ehoA > The code: > http://code.google.com/p/wave-ot-editor/source/browse/#svn/wave-ot-editor > > I can put together a JUnit test case showing that this case actually > stabilises using the Wave OT code, if that would help... > > > On Wed, Jan 20, 2010 at 11:40 AM, Torben Weis <[email protected]>wrote: > >> Hi Brett, >> >> thanks for the suggestion. >> However, it seems to me that this approach is not completely correct. >> >> Imagine two clients which are sending a delta against the same server >> version. >> The delta says to insert "Hello" at some position in a blip. >> The correct outcome is "HelloHello" being inserted. >> Now one client fails to submit its delta, the other one succeeds. >> The client that failed cannot detect that it failed, because the other >> delta looks exactly the same. Thus, in the end "Hello" will be inserted >> only once. >> >> I agree that this is an academic corner case, but I see no solution for >> this >> when relying on delta comparisons. >> >> Greetings >> Torben >> >> >> 2010/1/19 Brett Morgan <[email protected]> >> >>> If you are transforming your docops, you can compare the docops coming >>> back down for equality. You are doing client side transformations, right? >>> >>> org.waveprotocol.wave.model.operation.OpComparators is the FedOne code >>> for comparing equality of ops. Which, after a whole bunch of edge case >>> checking turns into the following comparison: >>> >>> DocOpUtil.toConciseString(a).equals(DocOpUtil.toConciseString(b)) >>> >>> In short, comparing docops for equality is easy, as long as you keep >>> transforming your docops... >>> >>> On Wed, Jan 20, 2010 at 9:42 AM, Torben Weis <[email protected]>wrote: >>> >>>> Hi James, >>>> >>>> How about when the client connects to the server again it does a history >>>>> check against the known good deltas it has sent out. If the last delta >>>>> it sent out isn't in the history, then it hasn't been received. >>>>> >>>> >>>> The problem is that this is impossible. How should QWaveClient recognize >>>> a delta as >>>> being its own? The server has perhaps transformed the delta, i.e. simple >>>> delta comparison >>>> is not possible and looking at version numbers does not help either. >>>> >>>> Greetings >>>> Torben >>>> >>>> >>>>> >>>>> -- >>>>> >>>>> James Purser >>>>> http://wavingtheshiny.collaborynth.com.au >>>>> Wave Addresses: >>>>> [email protected] (wave.google.com) >>>>> [email protected] (wavesandbox.com) >>>>> [email protected] (collaborynth.com.au FedOne Server) >>>>> Skype: purserj1977 >>>>> GTalk: [email protected] >>>>> >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Wave Protocol" group. >>>>> To post to this group, send email to [email protected]. >>>>> To unsubscribe from this group, send email to >>>>> [email protected]<wave-protocol%[email protected]> >>>>> . >>>>> For more options, visit this group at >>>>> http://groups.google.com/group/wave-protocol?hl=en. >>>>> >>>>> >>>>> >>>>> >>>> >>>> >>>> -- >>>> --------------------------- >>>> Prof. Torben Weis >>>> Universitaet Duisburg-Essen >>>> [email protected] >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Wave Protocol" group. >>>> To post to this group, send email to [email protected]. >>>> To unsubscribe from this group, send email to >>>> [email protected]<wave-protocol%[email protected]> >>>> . >>>> For more options, visit this group at >>>> http://groups.google.com/group/wave-protocol?hl=en. >>>> >>>> >>> >>> >>> -- >>> Brett Morgan http://domesticmouse.livejournal.com/ >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Wave Protocol" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]<wave-protocol%[email protected]> >>> . >>> For more options, visit this group at >>> http://groups.google.com/group/wave-protocol?hl=en. >>> >>> >> >> >> -- >> --------------------------- >> Prof. Torben Weis >> Universitaet Duisburg-Essen >> [email protected] >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Wave Protocol" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]<wave-protocol%[email protected]> >> . >> For more options, visit this group at >> http://groups.google.com/group/wave-protocol?hl=en. >> >> > > > -- > Brett Morgan http://domesticmouse.livejournal.com/ > > -- > You received this message because you are subscribed to the Google Groups > "Wave Protocol" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<wave-protocol%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/wave-protocol?hl=en. > > -- --------------------------- Prof. Torben Weis Universitaet Duisburg-Essen [email protected]--
You received this message because you are subscribed to the Google Groups "Wave Protocol" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to [email protected].
For more options, visit this group at http://groups.google.com/group/wave-protocol?hl=en.
