refactor: update Cache class initialization and open method; adjust cache path handling and improve cache management

Author: wonyoung-jang

logseq_analyzer/app.py

@@ -202,6 +202,7 @@ def setup_cache(args: Args) -> tuple[Cache, FileIndex]:
     index = FileIndex()
     cache_path = CacheFile(Constants.CACHE_FILE.value).path
     cache = Cache(cache_path)
+    cache.open(protocol=5)
     cache.initialize(args.graph_cache, index)
     logger.debug("run_app: setup_cache")
     return cache, index

logseq_analyzer/io/cache.py

@@ -27,17 +27,17 @@ class Cache:
     def __init__(self, cache_path: Path = None) -> None:
         """Initialize the class."""
         self.cache_path: Path = cache_path
-        self.cache: shelve.Shelf[Any] = self.open(protocol=5)
+        self.cache: shelve.Shelf[Any] = None
 
     def __repr__(self) -> str:
         return f'{self.__class__.__qualname__}(cache_path="{self.cache_path}")'
 
     def __str__(self) -> str:
         return f"{self.__class__.__qualname__}: {self.cache_path}"
 
-    def open(self, protocol: int = 5) -> shelve.Shelf[Any]:
+    def open(self, protocol: int = 5) -> None:
         """Open the cache file."""
-        return shelve.open(self.cache_path, protocol=protocol)
+        self.cache = shelve.open(self.cache_path, protocol=protocol)
 
     def close(self) -> None:
         """Close the cache file."""
@@ -63,8 +63,8 @@ def initialize(self, clear: bool, index: "FileIndex") -> None:
     def clear(self) -> None:
         """Clear the cache."""
         self.close()
-        self.cache_path.unlink()
-        self.cache = self.open(protocol=5)
+        self.cache_path.unlink(missing_ok=True)
+        self.open()
 
     def clear_deleted_files(self, index: "FileIndex") -> None:
         """Clear the deleted files from the cache."""