Yorkie

 Client "A" (Go)                 Agent                        Mongo DB
┌───────────────────┐           ┌────────────────────────┐   ┌───────────┐
│  Document "D-1"   │◄─Changes─►│  Collection "C-1"      │   │ Changes   │
│  { a: 1, b: {} }  │           │ ┌───────────────────┐  │◄─►│ Snapshots │
└───────────────────┘           │ │  Document "D-1"   │  │   └───────────┘
 Client "B" (JS)                │ │  { a: 2, b: {} }  │  │
┌───────────────────┐           │ │                   │  │
│  Document "D-1"   │◄─Changes─►│ │  Document "D-2"   │  │
│  { a: 2, b: {} }  │           │ │  { a: 3, b: {} }  │  │
└───────────────────┘           │ └───────────────────┘  │
 Client "C" (Admin)             │                        │
┌────────────────────┐          └────────────────────────┘
│  Query "Q-1"       │               ▲
│ db[c-1].find({a:2})├─MongoDB Query─┘
└────────────────────┘

• Clients can have a replica of the document representing an application model locally on several devices.
• Each client can independently update the document on their local device, even while offline.
• When a network connection is available, Yorkie figures out which changes need to be synced from one device to another, and brings them into the same state.
• If the document was changed concurrently on different devices, Yorkie automatically syncs the changes, so that every replica ends up in the same state with resolving conflict.