from dataclasses import dataclass, field
from typing import Dict


@dataclass
class CacheStats(object):
    """Collect statistics on cache performance."""

    hits: int = 0  # cache hits
    misses: int = 0  # cache misses
    high_watermark: int = 0  # amount of cache used
    in_cache: int = 0  # number of models in cache
    cleared: int = 0  # number of models cleared to make space
    cache_size: int = 0  # total size of cache
    loaded_model_sizes: Dict[str, int] = field(default_factory=dict)