Task Queue

A queue to schedule tasks to run in sequence always waiting for the previous task to be completed.

Example

TaskQueue queue = new TaskQueue();

Future function() {
  var completer1 = new Completer();
  Timer.run(expectAsync0(() => completer1.complete(1)));
  return completer1.future;
}

Future function2() {
  var completer2 = new Completer();
  Timer.run(expectAsync0(() => completer2.complete(2)));
  return completer2.future;
}

// function2 will only start to run after function has been completed
Future future1 = queue.schedule(function);
Future future2 = queue.schedule(function2);

Further Improvments

• Allow to iterate of the items in the queue.
• Remove a specific item from the queue.
• Allow to stop the queue on error.

Initial Requirements

• Add Task to Queue
• Execute Queue in the right order
• Execute one Task after another
• Allow to check if the queue is empty and no task is running