def play(self):
"""
Play the process.
"""
assert not self.__playing, \
"Cannot execute a process twice simultaneously"
try:
try:
MONITOR.register_process(self)
with self.__state_lock:
self._call_with_super_check(self.on_playing)
# Keep going until we run out of tasks
fn = self._next()
while fn is not None:
with self.__state_lock:
self._next_transition = None
fn()
fn = self._next()
except BaseException as e:
exc_type, value, tb = sys.exc_info()
self._perform_fail_noraise(e)
return
finally:
try:
MONITOR.deregister_process(self)
self._call_with_super_check(self.on_done_playing)
except BaseException as e:
if self.state != ProcessState.FAILED:
exc_type, value, tb = sys.exc_info()
self._perform_fail_noraise(e)
return self._outputs
def _on_stop_playing(self):
"""
WARNING: No state changes should be made after this call.
"""
MONITOR.deregister_process(self)
stack.pop(self)
self.__play_lock.release()
try:
self._call_with_super_check(self.on_done_playing)
except BaseException:
# Only set failed if it hasn't already failed, otherwise
# we could obscure the real reason
if self.state != ProcessState.FAILED:
self._set_and_execute_state(Failed(self, sys.exc_info()))
raise
self.__event_helper.fire_event(ProcessListener.on_process_done_playing,
self)
if self.has_terminated():
# There will be no more messages so remove the listeners. Otherwise we
# may continue to hold references to them and stop them being garbage
# collected
self.__event_helper.remove_all_listeners()