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Anki is a smart spaced repetition flashcard program
bc9f6e6a24
Decks now have an "update sequence number". All objects also have a USN, which is set to the deck USN each time they are modified. When syncing, each side sends any objects with a USN >= clientUSN. When objects are copied via sync, they have their USNs bumped to the current serverUSN. After a sync, the USN on both sides is set to serverUSN + 1. This solves the failing three way test, ensures we receive all changes regardless of clock drift, and as the revlog also has a USN now, ensures that old revlog entries are imported properly too. Objects retain a separate modification time, which is used for conflict resolution, deck subscriptions/importing, and info for the user. Note that if the clock is too far off, it will still cause confusion for users, as the due counts may be different depending on the time. For this reason it's probably a good idea to keep a limit on how far the clock can deviate. We still keep track of the last sync time, but only so we can determine if the schema has changed since the last sync. The media code needs to be updated to use USNs too. |
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