On Tue, 2010-01-19 at 18:50 +0100, Torben Weis wrote: > Hi, > > > I have been pondering on how to support offline-working in > QWaveClient. > It is getting tricky when the TCP connection breaks accidentially, > > > Let's imagine the client sent a delta to the server, the server > processes it, > but the client could not hear it because the connection is broken. > > > Eventually the client will reconnect. Now it does not have a chance of > seeing > whether its last delta has reached the server or not. > In general it seems next to impossible to tell whether any given > server delta corresponds > to a client delta, because deltas are transformed and do not carry > IDs. > > > Currently I see no quick solution. > Two more complex solutions come to my mind: > a) Introduce IDs in deltas. Unlikely because that would require Google > to change > its code heavily? Nevertheless, it would be nice because currently > QWaveClient uses > a most aweful hack to determin whether its delta has been processed > by the server ... > b) When connection to FedOne, the server should ask for a client ID. > For each client ID & wavelet ID it keeps a persistent record about > the version of the last submitted delta. > Upon connect the client can query fedone for this version > information. > This would mean no modifications to the federation protocol, but it > would require some fedone extensions. > > > Any other ideas, suggestions?
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. -- 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]
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