sequenceDiagram participant C as Client participant TS as Temporal Server participant W as OrderTrackingWorkflow participant A as Activity participant ES as External System Note over C,ES: Workflow State Inspection via Queries C->>TS: Start OrderTrackingWorkflow TS->>W: Initialize workflow W->>W: Set initial state W->>A: Execute validation activity A->>W: Validation complete W->>W: Update order status = VALIDATED Note over C,ES: Real-time State Queries C->>TS: Query: getCurrentStatus() TS->>W: Execute query method W->>TS: Return current status TS->>C: Status: VALIDATED W->>A: Execute inventory activity A->>ES: Check inventory ES->>A: Inventory available A->>W: Inventory reserved W->>W: Update status = INVENTORY_RESERVED C->>TS: Query: getOrderDetails() TS->>W: Execute query method W->>TS: Return detailed order info TS->>C: Order details with items C->>TS: Query: getProcessingHistory() TS->>W: Execute query method W->>TS: Return processing steps TS->>C: Step-by-step history rect rgb(245, 255, 245) Note over C,ES: Queries - Read-only, No side effects end rect rgb(255, 245, 245) Note over C,ES: Signals - Write operations, Change state end rect rgb(245, 245, 255) Note over C,ES: Activities - External operations, Side effects end