The data sync functionality is handled by Cloudant Sync. Cloudant Sync is a replication-protocol-compatible datastore for devices that don't want or need to run a full CouchDB instance. Cloudant replication functionality is used to synchronise data between the local datastore and a remote database, either a CouchDB instance or a Cloudant database. Many datastores can replicate with the same remote database, meaning that cross-device synchronisation is achieved by setting up replications from each device to the remote database.
Setup and Configuration
Dependencies
OpenSRP uses cloudant-sync-datastore-*.jar files setup in the core module as dependencies and doesn't load the cloudant dependencies through gradle as is norm. This is because the Cloudant sync library code has been modified to include a timestamp field (updated_at) to store the date and time a document is saved in the cloudant database.
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