fix: Fix detection of whether any instance is initialized

Closes: #674

Author: vdusek

src/apify/_actor.py

@@ -98,8 +98,8 @@ async def main() -> None:
     _is_rebooting = False
     """Whether the Actor is currently rebooting."""
 
-    _is_any_instance_initialized = False
-    """Whether any Actor instance was initialized."""
+    _initialized_instance_count = 0
+    """Count of currently initialized Actor instances."""
 
     def __init__(
         self,
@@ -175,7 +175,7 @@ async def __aenter__(self) -> Self:
         self.log.debug('Configuration initialized')
 
         # Warn about non-standard usage patterns.
-        if _ActorType._is_any_instance_initialized:
+        if self._is_any_instance_initialized:
             self.log.warning('Repeated Actor initialization detected - this is non-standard usage, proceed with care.')
 
         # Update the global Actor proxy to refer to this instance.
@@ -197,7 +197,7 @@ async def __aenter__(self) -> Self:
 
         # Mark initialization as complete and update global state.
         self._is_initialized = True
-        _ActorType._is_any_instance_initialized = True
+        _ActorType._initialized_instance_count += 1
         return self
 
     async def __aexit__(
@@ -247,6 +247,9 @@ async def finalize() -> None:
         await asyncio.wait_for(finalize(), self._cleanup_timeout.total_seconds())
         self._is_initialized = False
 
+        # Update global state - decrement instance count (ensure it doesn't go negative)
+        _ActorType._initialized_instance_count = max(0, _ActorType._initialized_instance_count - 1)
+
         if self._exit_process:
             sys.exit(self.exit_code)
 
@@ -389,6 +392,11 @@ def _storage_client(self) -> SmartApifyStorageClient:
             'awaiting `Actor.init`.'
         )
 
+    @property
+    def _is_any_instance_initialized(self) -> bool:
+        """Whether any Actor instance is currently initialized."""
+        return self._initialized_instance_count > 0
+
     async def init(self) -> None:
         """Initialize the Actor without using context-manager syntax.
 

tests/unit/conftest.py

@@ -62,7 +62,7 @@ def prepare_test_env(monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -> Callabl
     def _prepare_test_env() -> None:
         if hasattr(apify._actor.Actor, '__wrapped__'):
             delattr(apify._actor.Actor, '__wrapped__')
-        apify._actor._ActorType._is_any_instance_initialized = False
+        apify._actor._ActorType._initialized_instance_count = 0
 
         # Set the environment variable for the local storage directory to the temporary path.
         monkeypatch.setenv(ApifyEnvVars.LOCAL_STORAGE_DIR, str(tmp_path))