mirror of
https://github.com/home-assistant/core
synced 2024-08-02 23:40:32 +02:00
77 lines
2.3 KiB
Python
77 lines
2.3 KiB
Python
"""Base class for August entity."""
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from homeassistant.const import EVENT_HOMEASSISTANT_STOP
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from homeassistant.core import callback
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from homeassistant.helpers.event import async_track_time_interval
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class AugustSubscriberMixin:
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"""Base implementation for a subscriber."""
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def __init__(self, hass, update_interval):
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"""Initialize an subscriber."""
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super().__init__()
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self._hass = hass
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self._update_interval = update_interval
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self._subscriptions = {}
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self._unsub_interval = None
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self._stop_interval = None
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@callback
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def async_subscribe_device_id(self, device_id, update_callback):
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"""Add an callback subscriber.
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Returns a callable that can be used to unsubscribe.
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"""
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if not self._subscriptions:
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self._async_setup_listeners()
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self._subscriptions.setdefault(device_id, []).append(update_callback)
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def _unsubscribe():
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self.async_unsubscribe_device_id(device_id, update_callback)
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return _unsubscribe
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@callback
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def _async_setup_listeners(self):
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"""Create interval and stop listeners."""
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self._unsub_interval = async_track_time_interval(
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self._hass, self._async_refresh, self._update_interval
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)
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@callback
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def _async_cancel_update_interval(_):
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self._stop_interval = None
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self._unsub_interval()
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self._stop_interval = self._hass.bus.async_listen(
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EVENT_HOMEASSISTANT_STOP, _async_cancel_update_interval
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)
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@callback
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def async_unsubscribe_device_id(self, device_id, update_callback):
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"""Remove a callback subscriber."""
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self._subscriptions[device_id].remove(update_callback)
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if not self._subscriptions[device_id]:
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del self._subscriptions[device_id]
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if self._subscriptions:
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return
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self._unsub_interval()
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self._unsub_interval = None
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if self._stop_interval:
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self._stop_interval()
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self._stop_interval = None
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@callback
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def async_signal_device_id_update(self, device_id):
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"""Call the callbacks for a device_id."""
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if not self._subscriptions.get(device_id):
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return
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for update_callback in self._subscriptions[device_id]:
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update_callback()
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