Use a timer for polling.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

src/frequenz/dispatch/actor.py

@@ -11,6 +11,7 @@
 import grpc.aio
 from dateutil import rrule
 from frequenz.channels import Sender
+from frequenz.channels.util import Timer
 from frequenz.client.dispatch import Client
 from frequenz.client.dispatch.types import Dispatch, Frequency, Weekday
 from frequenz.sdk.actor import Actor
@@ -93,14 +94,14 @@ def __init__(
         self._microgrid_id = microgrid_id
         self._updated_dispatch_sender = updated_dispatch_sender
         self._ready_dispatch_sender = ready_dispatch_sender
-        self._poll_interval = poll_interval
+        self._poll_timer = Timer.timeout(poll_interval)
 
     async def _run(self) -> None:
         """Run the actor."""
+        self._poll_timer.reset()
         try:
-            while True:
+            async for _ in self._poll_timer:
                 await self._fetch()
-                await asyncio.sleep(self._poll_interval.total_seconds())
         except asyncio.CancelledError:
             for task in self._scheduled.values():
                 task.cancel()