Offline first architecture

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Offline-First Architecture Deep Dive

Overview

Offline-first: local DB is source of truth, sync when connected.

Core Concepts

1. All reads from local DB
2. Writes queued, synced
3. Conflict resolution on sync
4. Seamless online/offline

Code Examples

// Room as local source
@Dao
interface UserDao {
    @Insert(onConflict = OnConflictStrategy.REPLACE)
    suspend fun insertUser(user: User)
    @Query("SELECT * FROM users")
    fun getAllUsers(): Flow<List<User>>
}
// Repository coordinates
class UserRepository(
    private val api: UserApi,
    private val dao: UserDao
) {
    fun getUsers(): Flow<List<User>> = dao.getAllUsers()
    suspend fun syncUsers() {
        val remote = api.listUsers()
        dao.insertAll(remote)
    }
}

Senior-Level Insights

• WorkManager for background sync
• Prioritize recent changes
• Handle partial sync failures