Please enable JavaScript.

Coggle requires JavaScript to display documents.

Concurency (Operations (Knowledge (For building functionality that should…

- - - - Manage the maximum number of operations that can run simultaneously
      - Add work to
        
        Pass a closure
        
        Pass an array of Operations
        
        Paa an Operation
      - Manage the scheduling of an Operation
      - Run in the background by default
    - - Need to be write be myself
      - Want to make an operation async, need to make subclass of the Async Operation class
  - - - 1st end - second begin
      - pass data from 1st to 2nd operation
    - - You can add or remove dependency operation
      - {Operation}.addDependency()
      - {Operation}.removeDependency()
    - - By using Protocol (example ImageDataProvider)
      - in the main function of 2nd operation, check if any dependency is type ImageDataProvider, get image from that dependency and execute its task
- - - - Use thread barrier
      - private let threadSafeCountQueue = DispatchQueue(label: "...", attributes: .concurrent)
        private var _count = 0
        public var count: Int {
        get {
        return threadSafeCountQueue.sync {
        return _count
        }
        }
        set {
        threadSafeCountQueue.async(flags: .barrier) { [unowned self] in
        self._count = newValue
        }
        }
        }
- - - - Long running non UI task
      - Doesn't mean concurrent
    - - Single thread, single task at any given time
    - - Multi thread, multi tasks