puml

cd.puml

+@startuml
+
+interface SmartHomeMediator {
+    +notify(SmartDevice sender, string event)
+}
+
+class SmartDevice {
+    SmartHomeMediator mediator
+    +sendEvent(string event)
+}
+
+SmartDevice --> SmartHomeMediator : uses
+SmartDevice ..|> SmartHomeMediator
+
+class Light {
+    +turnOn()
+    +turnOff()
+}
+
+class Thermostat {
+    +setTemperature(int temp)
+}
+
+class SecuritySystem {
+    +arm()
+    +disarm()
+}
+
+class DoorLock {
+    +lock()
+    +unlock()
+}
+
+class Camera {
+    +startRecording()
+    +stopRecording()
+}
+
+class Speaker {
+    +playMusic()
+    +stopMusic()
+}
+
+class HomeMediator {
+    - Light light
+    - Thermostat thermostat
+    - SecuritySystem security
+    - DoorLock doorLock
+    - Camera camera
+    - Speaker speaker
+    +notify(SmartDevice sender, string event)
+}
+
+SmartHomeMediator <|.. HomeMediator
+SmartDevice <|-- Light
+SmartDevice <|-- Thermostat
+SmartDevice <|-- SecuritySystem
+SmartDevice <|-- DoorLock
+SmartDevice <|-- Camera
+SmartDevice <|-- Speaker
+
+HomeMediator *-- Light : owns
+HomeMediator *-- Thermostat : owns
+HomeMediator *-- SecuritySystem : owns
+HomeMediator *-- DoorLock : owns
+HomeMediator *-- Camera : owns
+HomeMediator *-- Speaker : owns
+
+@enduml