# Source code for scrapy.statscollectors

    """
    Scrapy extension for collecting scraping stats
    """
    import logging
    import pprint
    from typing import TYPE_CHECKING, Any, Dict, Optional

    from scrapy import Spider

    if TYPE_CHECKING:
        from scrapy.crawler import Crawler

    logger = logging.getLogger(__name__)

    StatsT = Dict[str, Any]

    class StatsCollector:
        def __init__(self, crawler: "Crawler"):
            self._dump: bool = crawler.settings.getbool("STATS_DUMP")
            self._stats: StatsT = {}

        def get_value(
            self, key: str, default: Any = None, spider: Optional[Spider] = None
        ) -> Any:
            return self._stats.get(key, default)

        def get_stats(self, spider: Optional[Spider] = None) -> StatsT:
            return self._stats

        def set_value(self, key: str, value: Any, spider: Optional[Spider] = None) -> None:
            self._stats[key] = value

        def set_stats(self, stats: StatsT, spider: Optional[Spider] = None) -> None:
            self._stats = stats

        def inc_value(
            self, key: str, count: int = 1, start: int = 0, spider: Optional[Spider] = None
        ) -> None:
            d = self._stats
            d[key] = d.setdefault(key, start) + count

        def max_value(self, key: str, value: Any, spider: Optional[Spider] = None) -> None:
            self._stats[key] = max(self._stats.setdefault(key, value), value)

        def min_value(self, key: str, value: Any, spider: Optional[Spider] = None) -> None:
            self._stats[key] = min(self._stats.setdefault(key, value), value)

        def clear_stats(self, spider: Optional[Spider] = None) -> None:
            self._stats.clear()

        def open_spider(self, spider: Spider) -> None:
            pass

        def close_spider(self, spider: Spider, reason: str) -> None:
            if self._dump:
                logger.info(
                    "Dumping Scrapy stats:\n" + pprint.pformat(self._stats),
                    extra={"spider": spider},
                )
            self._persist_stats(self._stats, spider)

        def _persist_stats(self, stats: StatsT, spider: Spider) -> None:
            pass

    class MemoryStatsCollector(StatsCollector):
        def __init__(self, crawler: "Crawler"):
            super().__init__(crawler)
            self.spider_stats: Dict[str, StatsT] = {}

        def _persist_stats(self, stats: StatsT, spider: Spider) -> None:
            self.spider_stats[spider.name] = stats

    class DummyStatsCollector(StatsCollector):
        def get_value(
            self, key: str, default: Any = None, spider: Optional[Spider] = None
        ) -> Any:
            return default

        def set_value(self, key: str, value: Any, spider: Optional[Spider] = None) -> None:
            pass

        def set_stats(self, stats: StatsT, spider: Optional[Spider] = None) -> None:
            pass

        def inc_value(
            self, key: str, count: int = 1, start: int = 0, spider: Optional[Spider] = None
        ) -> None:
            pass

        def max_value(self, key: str, value: Any, spider: Optional[Spider] = None) -> None:
            pass

        def min_value(self, key: str, value: Any, spider: Optional[Spider] = None) -> None:
            pass