Overview

The TICDSPreSynchronizationOperation class describes a generic operation used by the TICoreDataSync framework to synchronize changes made to a document.

In brief, a pre-synchronization operation pulls down remote sync commands and changes.

In full, the operation carries out the following tasks: (Sync Command tasks are included below, although not yet implemented)

1. Fetch an array containing UUID strings for each client device that has synchronized this document.
2. For each client device that isn’t the current device:
   1. Fetch an array containing UUID strings for each available SyncCommandSet.
3. Determine which SyncCommandSets haven’t yet been applied locally.
4. If any SyncCommandSets haven’t yet been applied, fetch them to the UnappliedSyncCommandSets helper file directory.
5. Go through each SyncCommandSet and:
   1. Carry out the command, determining whether synchronization can continue, or whether e.g. the entire store needs to be downloaded.
   2. Add the UUID of the set to the list of AppliedSyncCommands.ticdsync.
6. If synchronization can continue, then for each client device that isn’t the current device:
   1. Fetch an array containing UUID strings for each available SyncChangeSet.
   2. Determine which SyncChangeSets haven’t yet been applied locally.
   3. If any SyncChangeSets haven’t yet been applied, fetch them to the UnappliedSyncChangeSets helper file directory.

Operations are typically created automatically by the relevant sync manager.

%warning%
Warning: You must use one of the subclasses of TICDSPreSynchronizationOperation.