def __init__(self, path):
"""Initialise the class instance. This remembers the path identiy
and sets up the object's 'action' queue."""
# Always initialise the parent class instance...
super().__init__()
assert 0 < path <= Control.num_paths(), \
"Invalid strobe ID (%s)" % path
self.path = path
# Create our 'action' queue.
# STOP, START and QUIT commands are supplied to us through this queue.
# The queue is a small, limited size. When full the queue will block.
self.action_queue = queue.LifoQueue(_QUEUE_SIZE)
# We operate a counter (pending count) that is incremented when
# actions are placed in the queue and decremented after they have
# been taken out and processed. This allows the 'wait()' method
# to operate correctly - i.e. wait until a) the action queue
# is empty and the event has also been processed. The value is
# incremented for each put and decremented at the end of the run()
# code.
self.pending_count = 0
self.pending_count_lock = threading.Lock()
# Timestamp of last 'demand' input
self.last_demand_time = None
# Flag, cleared to exit the thread run() loop
self.running = True
def test_reset(self):
Control.reset()
# Validate...
a, b, path = Control.get_last_set_data()
self.assertFalse(a)
self.assertFalse(b)
self.assertEqual(Control.num_paths(), path)
def test_invalid_path_controller(self):
with self.assertRaises(AssertionError):
PathController.PathController(Control.num_paths() + 1)
