import threading
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from typing import Any, Generic, List, TypeVar
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from redis.typing import Number
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T = TypeVar("T")
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class WeightedList(Generic[T]):
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"""
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Thread-safe weighted list.
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"""
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def __init__(self):
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self._items: List[tuple[Any, Number]] = []
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self._lock = threading.RLock()
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def add(self, item: Any, weight: float) -> None:
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"""Add item with weight, maintaining sorted order"""
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with self._lock:
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# Find insertion point using binary search
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left, right = 0, len(self._items)
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while left < right:
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mid = (left + right) // 2
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if self._items[mid][1] < weight:
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right = mid
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else:
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left = mid + 1
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self._items.insert(left, (item, weight))
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def remove(self, item):
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"""Remove first occurrence of item"""
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with self._lock:
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for i, (stored_item, weight) in enumerate(self._items):
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if stored_item == item:
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self._items.pop(i)
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return weight
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raise ValueError("Item not found")
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def get_by_weight_range(
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self, min_weight: float, max_weight: float
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) -> List[tuple[Any, Number]]:
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"""Get all items within weight range"""
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with self._lock:
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result = []
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for item, weight in self._items:
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if min_weight <= weight <= max_weight:
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result.append((item, weight))
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return result
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def get_top_n(self, n: int) -> List[tuple[Any, Number]]:
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"""Get top N the highest weighted items"""
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with self._lock:
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return [(item, weight) for item, weight in self._items[:n]]
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def update_weight(self, item, new_weight: float):
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with self._lock:
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"""Update weight of an item"""
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old_weight = self.remove(item)
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self.add(item, new_weight)
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return old_weight
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def __iter__(self):
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"""Iterate in descending weight order"""
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with self._lock:
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items_copy = (
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self._items.copy()
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) # Create snapshot as lock released after each 'yield'
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for item, weight in items_copy:
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yield item, weight
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def __len__(self):
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with self._lock:
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return len(self._items)
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def __getitem__(self, index) -> tuple[Any, Number]:
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with self._lock:
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item, weight = self._items[index]
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return item, weight
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