class AbstractWorker(SynergyProcess):
"""
class works as an abstract basement for all workers and aggregators
it registers in the mq and awaits for the messages
"""
def __init__(self, process_name):
"""@param process_name: id of the process, the worker will be performing """
super(AbstractWorker, self).__init__(process_name)
self._init_performance_ticker(self.logger)
msg_suffix = 'in Production Mode'
if settings['under_test']:
msg_suffix = 'in Testing Mode'
self.logger.info('Started %s %s' % (self.process_name, msg_suffix))
def __del__(self):
try:
self.performance_ticker.cancel()
except Exception as e:
self.logger.error('Exception caught while cancelling the performance_ticker: %s' % str(e))
super(AbstractWorker, self).__del__()
# ********************** abstract methods ****************************
def _init_performance_ticker(self, logger):
self.performance_ticker = WorkerPerformanceTicker(logger)
self.performance_ticker.start()
# ********************** thread-related methods ****************************
def _mq_callback(self, message):
""" abstract method to process messages from MQ
@param message: mq message"""
pass
def _run_mq_listener(self):
try:
self.consumer = Consumer(self.process_name)
self.consumer.register(self._mq_callback)
self.consumer.wait()
except (AMQPException, IOError) as e:
self.logger.error('AMQPException: %s' % str(e))
finally:
self.__del__()
self.logger.info('Exiting main thread. All auxiliary threads stopped.')
def start(self):
self.main_thread = Thread(target=self._run_mq_listener)
self.main_thread.start()
def _run_mq_listener(self):
try:
self.consumer = Consumer(self.process_name)
self.consumer.register(self._mq_callback)
self.consumer.wait()
except (AMQPException, IOError) as e:
self.logger.error('AMQPException: %s' % str(e))
finally:
self.__del__()
self.logger.info('Exiting main thread. All auxiliary threads stopped.')