didFinish method never called when task is finished about overdrive HOT 2 CLOSED

The problem is that your queue instance is deallocated before the didFinish(task:inQueue) is called. For example, imagine if you had this method:

func doSomething() {
  let queue = CustomTaskQueue()
  queue.start()
}

After the start() method is executed, doSomething() method will return and deallocate the queue instance. However, task execution is asynchronous, and by the time it finishes, queue instance may be deallocated. That means that the didFinish(task:inQueue) method is never called.

Also, this specific code is structured this way because of how XCTest cases are structured, and you shouldn't use the same principle in your code. Most of the time TaskQueueDelegate should never know anything about the underlying queue. So, you implement TaskQueueDelegatemethods in some class and add it to existing TaskQueue

class SomeTaskQueueDelegate {
 // Implement methods
}

let queue = TaskQueue(qos: .default)
let delegate = SomeTaskQueueDelegate()

queue.delegate = delegate

let task = ImageTask()
queue.add(task: task)

Still, you'll need to make sure that you don't loose reference to your TaskQueue instances (like you would do for any other object).

Hope that this was helpful.

from overdrive.

Thank you @Arikis for the detailed precisions. It's logic now. My mistake was to do not consider observers methods in my tests to get information when a task begins and finishes.

from overdrive.