Requirements AzureData

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Colby Williams edited this page Mar 14, 2018 · 3 revisions

Phase 0: Refactor

Cosmos DB DocumentDB/SQL API Coverage
Migrate code that can be reused by other SDKs to AzureCore
Support full Cosmos DB DocumentDB/SQL API
TokenProvider updates to support multiple Auth/Resource Token requirements
Add metadata to response object
Implement optimistic concurrency control (OCC) by adding appropriate Headers
- If-None-Match on all GET
- If-Modified-Since on GET (ignored when If-None-Match is specified)
- If-Match on PUT and DELETE
Conflict resolution
- Latest wins (silent)
- Mine wins (silent)
- Manual (callback)
Save tokens to Keychain (AzureCore)
Querying resources
- Support for "raw" SQL queries (validation?)
- Query type and custom syntax language for chaining together conditions
Overrides for partition keys

Phase 1: Data Persistence

Offline persistence is enabled by default (for all resources)
User has option to disable offline persistence (for all resources)
Data is successfully written remotely before caching locally
Only READING is supported while device is offline, WRITE throws a (useful) error
Add fromCache to response object when returning data from cache (device offline)
Simple API to Purge entire data cache

Phase 2: Offline Write

Add WRITE support when offline
Queue writes when offline
Automatically push any local changes as soon as device comes back online
- Send global notification to let user know data changed

Phase 3: Granular Persistence Control

User has option to disable offline persistence for collections only (documents would respect parent collection option persistence)

Phase 4: Time-To-Live

Add Time-To-Live (TTL) functionality to improve GET performance for non-volatile data

Phase N: Change Feed

Change feed support