Align max expected entities constant between modules (#118102)

homeassistant/const.py

@@ -1638,6 +1638,12 @@ FORMAT_DATE: Final = "%Y-%m-%d"
 FORMAT_TIME: Final = "%H:%M:%S"
 FORMAT_DATETIME: Final = f"{FORMAT_DATE} {FORMAT_TIME}"
 
+
+# Maximum entities expected in the state machine
+# This is not a hard limit, but caches and other
+# data structures will be pre-allocated to this size
+MAX_EXPECTED_ENTITY_IDS: Final = 16384
+
 # These can be removed if no deprecated constant are in this module anymore
 __getattr__ = partial(check_if_deprecated_constant, module_globals=globals())
 __dir__ = partial(

homeassistant/core.py

@@ -74,6 +74,7 @@ from .const import (
     EVENT_STATE_CHANGED,
     EVENT_STATE_REPORTED,
     MATCH_ALL,
+    MAX_EXPECTED_ENTITY_IDS,
     MAX_LENGTH_EVENT_EVENT_TYPE,
     MAX_LENGTH_STATE_STATE,
     UnitOfLength,
@@ -177,7 +178,6 @@ _DEPRECATED_SOURCE_YAML = DeprecatedConstantEnum(ConfigSource.YAML, "2025.1")
 # How long to wait until things that run on startup have to finish.
 TIMEOUT_EVENT_START = 15
 
-MAX_EXPECTED_ENTITY_IDS = 16384
 
 EVENTS_EXCLUDED_FROM_MATCH_ALL = {
     EVENT_HOMEASSISTANT_CLOSE,

homeassistant/helpers/entity_values.py

@@ -7,16 +7,15 @@ from functools import lru_cache
 import re
 from typing import Any
 
+from homeassistant.const import MAX_EXPECTED_ENTITY_IDS
 from homeassistant.core import split_entity_id
 
-_MAX_EXPECTED_ENTITIES = 16384
-
 
 class EntityValues:
     """Class to store entity id based values.
 
     This class is expected to only be used infrequently
-    as it caches all entity ids up to _MAX_EXPECTED_ENTITIES.
+    as it caches all entity ids up to MAX_EXPECTED_ENTITY_IDS.
 
     The cache includes `self` so it is important to
     only use this in places where usage of `EntityValues` is immortal.
@@ -41,7 +40,7 @@ class EntityValues:
 
         self._glob = compiled
 
-    @lru_cache(maxsize=_MAX_EXPECTED_ENTITIES)
+    @lru_cache(maxsize=MAX_EXPECTED_ENTITY_IDS)
     def get(self, entity_id: str) -> dict[str, str]:
         """Get config for an entity id."""
         domain, _ = split_entity_id(entity_id)