mirror of
https://github.com/blakeblackshear/frigate.git
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40 lines
1.1 KiB
Python
40 lines
1.1 KiB
Python
import multiprocessing as mp
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import queue
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import threading
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from multiprocessing import Queue
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from multiprocessing.synchronize import Event as MpEvent
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from typing import Callable
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from frigate.comms.dispatcher import Communicator
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class InterProcessCommunicator(Communicator):
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def __init__(self, queue: Queue) -> None:
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self.queue = queue
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self.stop_event: MpEvent = mp.Event()
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def publish(self, topic: str, payload: str, retain: bool) -> None:
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"""There is no communication back to the processes."""
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pass
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def subscribe(self, receiver: Callable) -> None:
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self._dispatcher = receiver
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self.reader_thread = threading.Thread(target=self.read)
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self.reader_thread.start()
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def read(self) -> None:
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while not self.stop_event.is_set():
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try:
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(
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topic,
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value,
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) = self.queue.get(True, 1)
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except queue.Empty:
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continue
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self._dispatcher(topic, value)
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def stop(self) -> None:
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self.stop_event.set()
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self.reader_thread.join()
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