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What Is the Difference Between a Mutator and a Snapshot in Memento? Is It Significant?
May 7th, 2007It seems that you could create a snapshot, which would simply be a timestamp, and get rolling. However, let’s say that you begin to commit a mutation. You get a timestamp from the system. You write out an object into a Bin and then you go to sleep. Another thread creates a snapshot that is based on the timestamp only, it does not build map of committed mutations, and encounters the object written to the Bin. It will use that value, breaking atomicity, because the mutation thread has slept before it write the other objects in the mutation. There is no difference between an snapshot and a mutator, so we will define only the class Snapshot.
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