Serialize access to the UITableView for scrolling and diffable datasource updates. Issue #1806

iOS/MasterFeed/MasterFeedDataSourceOperation.swift

@@ -0,0 +1,39 @@
+//
+//  MasterFeedDataSourceOperation.swift
+//  NetNewsWire-iOS
+//
+//  Created by Maurice Parker on 2/23/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import UIKit
+import RSCore
+import RSTree
+
+class MasterFeedDataSourceOperation: MainThreadOperation {
+	
+	// MainThreadOperation
+	public var isCanceled = false
+	public var id: Int?
+	public weak var operationDelegate: MainThreadOperationDelegate?
+	public var name: String? = "MasterFeedDataSourceOperation"
+	public var completionBlock: MainThreadOperation.MainThreadOperationCompletionBlock?
+
+	private var dataSource: UITableViewDiffableDataSource<Node, Node>
+	private var snapshot: NSDiffableDataSourceSnapshot<Node, Node>
+	private var animating: Bool
+	
+	init(dataSource: UITableViewDiffableDataSource<Node, Node>, snapshot: NSDiffableDataSourceSnapshot<Node, Node>, animating: Bool) {
+		self.dataSource = dataSource
+		self.snapshot = snapshot
+		self.animating = animating
+	}
+	
+	func run() {
+		dataSource.apply(snapshot, animatingDifferences: animating) { [weak self] in
+			guard let self = self else { return }
+			self.operationDelegate?.operationDidComplete(self)
+		}
+	}
+	
+}