77 lines
1.5 KiB
Swift
77 lines
1.5 KiB
Swift
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//
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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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private final class BatchUpdatesTracker {
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private var batchUpdatesCount = 0
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var isPerformingBatchUpdates: Bool {
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get {
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return batchUpdatesCount > 0
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}
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}
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func incrementBatchUpdatesCount() {
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batchUpdatesCount = batchUpdatesCount + 1
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}
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func decrementBatchUpdatesCount() {
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batchUpdatesCount = batchUpdatesCount - 1
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if batchUpdatesCount < 1 {
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if batchUpdatesCount < 0 {
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assertionFailure("Batch updates count should never be below 0.")
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batchUpdatesCount = 0
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}
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batchUpdatesCount = 0
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postDataModelDidPerformBatchUpdates()
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}
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}
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func postDataModelDidPerformBatchUpdates() {
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NotificationCenter.default.post(name: .DataModelDidPerformBatchUpdates, object: nil)
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}
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}
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fileprivate let batchUpdatesTracker = BatchUpdatesTracker()
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public func dataModelIsPerformingBatchUpdates() -> Bool {
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return batchUpdatesTracker.isPerformingBatchUpdates
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}
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public typealias BatchUpdatesBlock = () -> Void
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public func performDataModelBatchUpdates(_ batchUpdatesBlock: BatchUpdatesBlock) {
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startDataModelBatchUpdates()
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batchUpdatesBlock()
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endDataModelBatchUpdates()
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}
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private func startDataModelBatchUpdates() {
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batchUpdatesTracker.incrementBatchUpdatesCount()
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}
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private func endDataModelBatchUpdates() {
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batchUpdatesTracker.decrementBatchUpdatesCount()
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}
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