// Copyright (c) 2023 Proton AG
//
// This file is part of Proton Mail Bridge.
//
// Proton Mail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Proton Mail Bridge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Proton Mail Bridge.  If not, see <https://www.gnu.org/licenses/>.

package userevents

// Subscribable represents a type that allows the registration of event subscribers.
type Subscribable interface {
	Subscribe(subscription EventSubscriber)
	Unsubscribe(subscription EventSubscriber)
}

type NoOpSubscribable struct{}

func (n NoOpSubscribable) Subscribe(_ EventSubscriber) {
	// Does nothing
}

func (n NoOpSubscribable) Unsubscribe(_ EventSubscriber) {
	// Does nothing
}