initial

.venv/lib/python3.12/site-packages/ezdxf/messenger.py

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+# Copyright (c) 2024, Manfred Moitzi
+# License: MIT License
+from __future__ import annotations
+from typing import TYPE_CHECKING, Any
+
+if TYPE_CHECKING:
+    from ezdxf.document import Drawing
+
+
+class Messenger:
+    def __init__(self, doc: Drawing) -> None:
+        self.doc = doc
+        self.entitydb = doc.entitydb
+
+    def broadcast(self, message_type: int, data: Any = None) -> None:
+        """Broadcast a message to all entities in the entity database."""
+        # Receiver can change the entity database while processing the message.
+        for entity in list(self.entitydb.values()):
+            entity.notify(message_type, data)