Move queue helper functions to staticmethods on their adapters.

Co-authored-by: Cursor <[email protected]>

python_repositories/adapters/file_backed_queue_adapter.py

@@ -11,22 +11,13 @@ from typing import Any, Self, TextIO
 
 import structlog
 
-from python_repositories.adapters.memory_queue_adapter import (
-    MemoryQueueAdapter,
-    _parse_age,
-)
+from python_repositories.adapters.memory_queue_adapter import MemoryQueueAdapter
 from python_repositories.config.file_queue_config import FileQueueConfig
 from python_repositories.interfaces.queue_repository_interface import (
     QueueRepositoryInterface,
 )
 
 
-def _json_default(value: object) -> str:
-    if isinstance(value, datetime):
-        return value.isoformat()
-    raise TypeError(f"Object of type {type(value)!r} is not JSON serializable")
-
-
 class FileBackedQueueAdapter(QueueRepositoryInterface):
     """Queue that mirrors an in-memory buffer to an append-friendly JSONL file.
 
@@ -54,6 +45,12 @@ class FileBackedQueueAdapter(QueueRepositoryInterface):
         self._append_handle: TextIO | None = None
         self.logger = structlog.get_logger(self.__class__.__name__)
 
+    @staticmethod
+    def _json_default(value: object) -> str:
+        if isinstance(value, datetime):
+            return value.isoformat()
+        raise TypeError(f"Object of type {type(value)!r} is not JSON serializable")
+
     def __enter__(self) -> Self:
         self.connect()
         return self
@@ -170,7 +167,7 @@ class FileBackedQueueAdapter(QueueRepositoryInterface):
                         )
                         continue
                     try:
-                        if _parse_age(age_value) < cutoff:
+                        if MemoryQueueAdapter._parse_age(age_value) < cutoff:
                             continue
                     except ValueError:
                         self.logger.warning(
@@ -194,7 +191,7 @@ class FileBackedQueueAdapter(QueueRepositoryInterface):
             raise RuntimeError("append handle is not open")
         for item in items:
             self._append_handle.write(
-                json.dumps(item, default=_json_default, separators=(",", ":"))
+                json.dumps(item, default=self._json_default, separators=(",", ":"))
             )
             self._append_handle.write("\n")
         self._append_handle.flush()
@@ -210,7 +207,7 @@ class FileBackedQueueAdapter(QueueRepositoryInterface):
         with tmp_path.open("w", encoding="utf-8") as handle:
             for item in self._memory.snapshot():
                 handle.write(
-                    json.dumps(item, default=_json_default, separators=(",", ":"))
+                    json.dumps(item, default=self._json_default, separators=(",", ":"))
                 )
                 handle.write("\n")
             handle.flush()