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from time import perf_counter
import logging
logger = logging.getLogger(__name__)
class BaseHandler:
"""
Base class for pipeline parts. Each part of the pipeline has an input and an output queue.
The `setup` method along with `setup_args` and `setup_kwargs` can be used to address the specific requirements of the implemented pipeline part.
To stop a handler properly, set the stop_event and, to avoid queue deadlocks, place b"END" in the input queue.
Objects placed in the input queue will be processed by the `process` method, and the yielded results will be placed in the output queue.
The cleanup method handles stopping the handler, and b"END" is placed in the output queue.
"""
def __init__(self, stop_event, queue_in, queue_out, setup_args=(), setup_kwargs={}):
self.stop_event = stop_event
self.queue_in = queue_in
self.queue_out = queue_out
self.setup(*setup_args, **setup_kwargs)
self._times = []
def setup(self):
pass
def process(self):
raise NotImplementedError
def run(self):
while not self.stop_event.is_set():
input = self.queue_in.get()
if isinstance(input, bytes) and input == b"END":
# sentinelle signal to avoid queue deadlock
logger.debug("Stopping thread")
break
start_time = perf_counter()
for output in self.process(input):
self._times.append(perf_counter() - start_time)
logger.debug(f"{self.__class__.__name__}: {self.last_time: .3f} s")
self.queue_out.put(output)
start_time = perf_counter()
self.cleanup()
self.queue_out.put(b"END")
@property
def last_time(self):
return self._times[-1]
def cleanup(self):
pass
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