3.1.4.4 Algorithm for Updating the FSVCA Metadata When an Item Changes

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The inputs for this algorithm are the following:

SyncGid: The 24-byte SYNC_GID that uniquely identifies an item within the dataset.

IsDelete: A flag that indicates if an item is deleted from the dataset.

The Participant store MUST update the metadata as follows:

  • Increment the tick count of all the ClockVectorElements associated with the local replica in ClockVectorList.

  • Search for a FileItemEntry in FileItemList where SyncGid is equal to FileItemEntry.SyncGid. If an entry is found:

    • Set FileItemEntry.ChangeTickCount to the TickCount associated with the local replica in ClockVectorList.

    • If IsDelete is TRUE, set FileItemEntry.IsDeleted to TRUE.

  • Otherwise, create a FileItemEntry and initialize it as follows:

    • Set FileItemEntry.SyncGid to SyncGid.

    • Set FileItemEntry.CreateReplicaKey to the index of the local replica in the ReplicaTable.

    • Set FileItemEntry.CreateTickCount to the TickCount associated with the local replica in ClockVectorList.

    • Set FileItemEntry.ChangeReplicaKey to the index of the local replica in the ReplicaTable.

    • Set FileItemEntry.ChangeTickCount to the TickCount associated with the local replica in ClockVectorList.

    • Set FileItemEntry.IsDeleted to FALSE.

    • Set WinnerExists to FALSE.

    • Set WinningFileItem to 0.