66 lines
1.1 KiB
Swift
66 lines
1.1 KiB
Swift
//
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// BatchUpdates.swift
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// DataModel
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//
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// Created by Brent Simmons on 9/12/16.
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// Copyright © 2016 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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public typealias BatchUpdateBlock = () -> Void
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public extension Notification.Name {
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public static let BatchUpdateDidFinish = Notification.Name(rawValue: "BatchUpdateDidFinish")
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}
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final class BatchUpdate {
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static let shared = BatchUpdate()
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private var count = 0
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var isPerforming: Bool {
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get {
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return count > 0
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}
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}
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func perform(_ batchUpdateBlock: BatchUpdateBlock) {
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incrementCount()
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batchUpdateBlock()
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decrementCount()
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}
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}
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private extension BatchUpdate {
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func incrementCount() {
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count = count + 1
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}
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func decrementCount() {
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count = count - 1
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if count < 1 {
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if count < 0 {
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assertionFailure("Batch updates count should never be below 0.")
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count = 0
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}
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count = 0
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postBatchUpdateDidPerform()
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}
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}
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func postBatchUpdateDidPerform() {
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NotificationCenter.default.post(name: .BatchUpdateDidFinish, object: nil, userInfo: nil)
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}
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}
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