//
//  Debouncer.swift
//
//  Created by Sam Oakley on 20/03/2019.
//

import Foundation

class Debouncer {

    private static var pendingRequestWorkItems: [AnyHashable: DispatchWorkItem] = [:]

    static func perform(context: AnyHashable, after: DispatchTimeInterval, block: @escaping () -> Void) {
        let pendingRequestWorkItem = pendingRequestWorkItems[context]
        pendingRequestWorkItem?.cancel()

        let requestWorkItem = DispatchWorkItem(block: block)
        pendingRequestWorkItems[context] = requestWorkItem
        DispatchQueue.main.asyncAfter(deadline: .now() + after,
                                      execute: requestWorkItem)
    }
}