---
tags: NewPOS, diagram, architecture
---

# Dock POS (New POS) diagram

## Dock Design

@startuml
package Service {
    class Service {
        add_characteristic()
        get_characteristic()
        set_context()
        run()    
    }
    class AccessoryService {}    
    class DockService {
        - Accessories
        serviceinfo()
        run()
        handle()
    }
    class YourService{
        - Device
    }
    
    DockService -u-|> Service
    YourService -u-|> AccessoryService
    AccessoryService -u-|> Service
}
package Device {
    class Device {
         add_service()
         get_service()
         run()
         start()
         stop()
    }
    class Bridge #aliceblue ##blue{
        -nodes

        add_device()
        start()
        stop()
    }
    class YourDevice {
        - Services
    }
    Bridge -d-|> Device
    YourDevice -d-|> Device
    
}

package Channel {
    class MQTTChannel {
        connect()
        disconnect()
        loop()
        publish()
        subscribe()    
        @property will_set()
        @property connected()

    }

    class ServiceDirectory {    
        is_primary()
        start()
        stop()
        register_service()
        unregister_service()
        is_registered()
        welcome()
        update()
        update_sd()
        update_service()
        lookup_service()
        handle_message()
    }
    MQTTChannel -r- ServiceDirectory:messager
}


DockService -- ServiceDirectory:msd
DockService -- MQTTChannel:messager

DockService --> Bridge:add_service

YourService -r-> DockService:add to accessories
YourService <--> YourDevice:Bind
@enduml

## Class Diagram

- Device
- contains Services
- responsible for starting/stopping Services
- Service
- contains the associated Device
- Bridge (Device)
- contains other Devices, responsible for communication between devices
- responsible for starting/stopping other Devices
- DockService (Service)
- contains AccessoryServices
- responsible for initializing/starting/stopping ServiceDirectory
- responsible for initializing/starting/stopping MQTTChannel
- AccessoryService (Service)
- contains associated DockService (context)
- ServiceDirectory
- contains list of service directory
- responsible for registration / lookup of other services / service directory (??)
- MQTTChannel
- contains DockService as its handler (to be changed)

@startuml dock_class_diagram

'skinparam defaultFontSize 20

class MQTTChannel {
  - _on_message_handlers
}

class ServiceDirectory {
  + messenger: MQTTChannel
  + start(messenger: MQTTChannel)
  + post_serviceinfo(serviceinfo: Dict[str,?])
  '+ register_service(serviceinfo: Dict[str,?])
  '+ unregister_service(serviceinfo: Dict[str,?])
  
}

class Service {
  + context: DockService
  + device: Device
  + set_context(context: DockService)
}

class DockService {
  msd: ServiceDirectory
  messenger: MQTTChannel
  + add_accessory(accsessory: AccessoryService)
  + handle_event(event)
}

class AccessoryService {
  emit_event(event)
}

class PrintService
class EDCService
class HIDInput
class Device {
  + services: Dict[str, Service]
  + add_service(service:Service)
}
class Bridge{
  + nodes: Dict[str, Device]
  + add_device(device: Device)
}

class PrinterDevice
class InvoicePrinter
<> isService
<> usesDock
' DockService -|> Service
' DockService <- Service 

Service <|-- isService
isService -- DockService
isService -- AccessoryService
'isService -- EDCService
Device <|-- Bridge
Device <|-- PrinterDevice
Device <|-- EDCDevice
InvoicePrinter <|-- PrinterDevice 


'PrinterDevice o-- PrintService

AccessoryService <|-- PrintService
AccessoryService <|-- HIDInput
AccessoryService <|-- EDCService

EDCService <|-- EDC_TSB

usesDock "*" - Service
usesDock --o "1" DockService

' ServiceDirectory o-- MQTTChannel
' DockService o-- MQTTChannel


'ServiceDirectory o- MQTChannel
MQTTChannel  "1" - "1" DockService
'DockService "1" - "1" MQTTChannel
MQTTChannel --o ServiceDirectory


DockService *--  ServiceDirectory
'DockService *-- MQTTChannel
'ServiceDirectory -* DockService
Service "*" -o "0..1" Device : "\t\t"
' Service o- Device
' Service -o Device
Device "*" --o "1" Bridge
' Service o- DockService


@enduml

## Device/Service object instantiation

@startwbs
* (Device)\nBridge
** (Service)\nDockService 
*** ServiceDirectory
*** MQTTChannel
** (EDCDevice)\nEDCDeviceFactory
*** (AccessoryService)\nEDCServiceFactory
** (EDCDevice)\nEDCDevice[TSB,NCCC,FUBO] 
*** (AccessoryService)\nEDCService[TSB,NCCC,FUBO]  
** (AccessoryService)\nHIDInput
** (AccessoryService)\nCheckDevice
** (Device)\nPrinter
*** (AccessoryService)\nPrinter 
@endwbs

1. PrinterDevice adds PrintService
- PrintService sets the PrinterDevice as its device
2. EDCDeviceFactory adds EDCServiceFactory
- EDCServiceFactory sets the EDCDeviceFactory as its device
4. EDCDevice[TSB,NCCC,FUBO], adds EDCService[TSB,NCCC,FUBO]
- EDCService[TSB,NCCC,FUBO] sets the EDCDevice[TSB,NCCC,FUBO] as its device
5. DockService adds AccessoryService s
- AccessoryService sets the DockService as its context
- If AccessoryService has device
- Add AccessoryService's device to DockService's device's (Bridge) device list
- Else
- AccessoryService sets the DockService's device (Bridge) as its device
6. Bridge adds DockService
- DockService sets the Bridge as its device
7. Starts Bridge
- run device's services
- start other nodes (device list)
- start PrinterDevice
- run device's services
- start EDCDeviceTSB
- run device's services