package core

import "github.com/google/uuid"

// abstraction for dispatcher to make it replaceable
type Subscriber interface {
	Subscribe() (int16, <-chan string)
	Unsubscribe(id int16) error
}

// abstraction for dispatcher to make it replaceable
type Publisher interface {
	Publish(message string)
	Streamer
}

// implementing struct should be responsible for message forwarding (to client)
type Streamer interface {
	SetStreaming(s bool) (ok bool)
	IsClosed() bool
}

// abstraction for persistance layer
type Storer interface {
	Save(tracking Tracking) error
	LoadAll() ([]TrackingMetadata, error)
	Load(id uuid.UUID) (*Tracking, error)
}