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"""Cache management for GUI - LRU caches for performance optimization."""
from PySide6 import QtCore, QtGui
class TrackExtrasCache:
"""Thread-safe LRU cache for track extra metadata."""
def __init__(self, max_size: int = 256):
self._lock = QtCore.QReadWriteLock()
self._data: dict[str, dict] = {}
self._order: list[str] = []
self._max_size = max_size
def get(self, track_id: str) -> dict | None:
"""Get cached extras for a track ID."""
with QtCore.QReadLocker(self._lock):
return self._data.get(track_id)
def set(self, track_id: str, extras: dict) -> None:
"""Cache extras for a track ID with LRU eviction."""
with QtCore.QWriteLocker(self._lock):
if track_id in self._data:
self._order.remove(track_id)
self._data[track_id] = extras
self._order.append(track_id)
if len(self._order) > self._max_size:
oldest = self._order.pop(0)
self._data.pop(oldest, None)
class CoverPixmapCache:
"""Thread-safe LRU cache for cover pixmaps to avoid re-downloading."""
def __init__(self, max_size: int = 100):
self._lock = QtCore.QReadWriteLock()
self._pixmaps: dict[str, QtGui.QPixmap] = {}
self._order: list[str] = []
self._max_size = max_size
def get(self, cover_url: str) -> QtGui.QPixmap | None:
"""Get cached pixmap for a cover URL."""
with QtCore.QReadLocker(self._lock):
return self._pixmaps.get(cover_url)
def set(self, cover_url: str, pixmap: QtGui.QPixmap) -> None:
"""Cache a pixmap with LRU eviction."""
with QtCore.QWriteLocker(self._lock):
if cover_url in self._pixmaps:
self._order.remove(cover_url)
self._pixmaps[cover_url] = pixmap
self._order.append(cover_url)
if len(self._order) > self._max_size:
oldest = self._order.pop(0)
self._pixmaps.pop(oldest, None)
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