class MeasurementsPlayer(object):
def __init__(self, data_file, callback):
self.data_file = data_file
self.callback = callback
self.experiment_file = ExperimentFile(self.data_file)
def play(self):
playback_start = int(time.time())
measurement_start = None
logger.info('Start replaying file')
nb_messages = 0
for measurement in self.experiment_file.open_for_reading():
if not measurement_start:
measurement_start = measurement['created_at']
logger.info('Sending a message %s' % measurement['sensor_id'])
nb_messages += 1
playback_delta = int(time.time()) - playback_start
measurement_delta = measurement['created_at'] - measurement_start
if playback_delta < measurement_delta:
# Sleep in order to wait for the correct time to play
# back this measurement.
logger.info('sleeping %d' % (measurement_delta - playback_delta))
time.sleep((measurement_delta - playback_delta) / 1000000.0)
"""
else:
# Skip this measurement because we're behind
continue
"""
self.callback(json.dumps(measurement))
logger.info('Done replaying file with %s messages', nb_messages)
self.experiment_file.close()
class MeasurementsPlayer(object):
def __init__(self, data_file, callback):
self.data_file = data_file
self.callback = callback
self.experiment_file = ExperimentFile(self.data_file)
def play(self):
playback_start = int(time.time())
measurement_start = None
logger.info('Start replaying file')
nb_messages = 0
for measurement in self.experiment_file.open_for_reading():
if not measurement_start:
measurement_start = measurement['created_at']
logger.info('Sending a message %s' % measurement['sensor_id'])
nb_messages += 1
playback_delta = int(time.time()) - playback_start
measurement_delta = (measurement['created_at'] - measurement_start) / 1000.0
if playback_delta < measurement_delta:
# Sleep in order to wait for the correct time to play
# back this measurement.
time_to_sleep = measurement_delta - playback_delta
logger.info('sleeping %.2f seconds' % time_to_sleep)
time.sleep(time_to_sleep)
# Put the exact time of the measurement pumping into the
# created_at field so that we simulate that the measurement
# appeared right now.
measurement['created_at'] = int(time.time() * 1000.0)
self.callback(json.dumps(measurement))
logger.info('Done replaying file with %s messages', nb_messages)
self.experiment_file.close()
