COVIDSafe code from version 1.1

CovidSafe/Feedback/Sources/AsyncAction.swift

@@ -0,0 +1,72 @@
+//  Copyright © 2015 Australian Government All rights reserved.
+
+import Foundation
+
+open class AsyncAction: Operation {
+
+  fileprivate var _executing = false
+  fileprivate var _finished = false
+
+  override fileprivate(set) open var isExecuting: Bool {
+    get {
+      return _executing
+    }
+    set {
+      willChangeValue(forKey: "isExecuting")
+      _executing = newValue
+      didChangeValue(forKey: "isExecuting")
+    }
+  }
+
+  override fileprivate(set) open var isFinished: Bool {
+    get {
+      return _finished
+    }
+    set {
+      willChangeValue(forKey: "isFinished")
+      _finished = newValue
+      didChangeValue(forKey: "isFinished")
+    }
+  }
+
+  override open var completionBlock: (() -> Void)? {
+    set {
+      super.completionBlock = newValue
+    }
+    get {
+      return {
+        super.completionBlock?()
+        self.actionCompleted()
+      }
+    }
+  }
+
+  override open var isAsynchronous: Bool {
+    return true
+  }
+
+  override open func start() {
+    if isCancelled {
+      isFinished = true
+      return
+    }
+
+    isExecuting = true
+    autoreleasepool {
+      self.run()
+    }
+  }
+
+  func run() {
+    preconditionFailure("This abstract method must be overridden.")
+  }
+
+  func actionCompleted() {
+    //optional
+  }
+
+  func finishedExecutingOperation() {
+    isExecuting = false
+    isFinished = true
+  }
+}