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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
import Foundation
/**
* Interface for listening to Loader updates.
*/
public protocol LoaderListener: AnyObject {
associatedtype T
func loader(dataLoaded data: T)
}
/**
* Base implementation for a "push" data model.
* Interested clients add themselves as listeners for data changes.
*/
open class Loader<T, ListenerType: LoaderListener> where T == ListenerType.T {
private let listeners = WeakList<ListenerType>()
public init() {}
open func addListener(_ listener: ListenerType) {
listeners.insert(listener)
}
open func load(_ data: T) {
for listener in listeners {
listener.loader(dataLoaded: data)
}
}
}