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| from collections import OrderedDict | |
| from datetime import datetime | |
| from typing import Optional | |
| class CacheHandler: | |
| def __init__(self, max_cache_size: int = 1000): | |
| # Using OrderedDict to maintain the order of insertion for efficient removal of oldest items | |
| self.cache = OrderedDict() | |
| self.max_cache_size = max_cache_size | |
| self.misses = 0 | |
| self.hits = 0 | |
| def add_to_cache( | |
| self, url: str, title: str, text: str, summary_type: int, summary: str | |
| ): | |
| # If URL already exists, update it and move it to the end to mark it as the most recently used | |
| if url in self.cache: | |
| self.cache.move_to_end(url) | |
| self.cache[url][f"summary_{summary_type}"] = summary | |
| self.cache[url]["date"] = datetime.now() | |
| else: | |
| # Add new entry to the cache | |
| self.cache[url] = { | |
| "title": title, | |
| "text": text, | |
| "date": datetime.now(), | |
| "summary_0": summary if summary_type == 0 else None, | |
| "summary_50": summary if summary_type == 50 else None, | |
| "summary_100": summary if summary_type == 100 else None, | |
| } | |
| # Remove the oldest item if cache exceeds max size | |
| if len(self.cache) > self.max_cache_size: | |
| self.cache.popitem(last=False) # pop the oldest item | |
| def get_from_cache( | |
| self, url: str, summary_type: int, second_try: bool = False | |
| ) -> Optional[tuple]: | |
| if url in self.cache and self.cache[url][f"summary_{summary_type}"] is not None: | |
| # Move the accessed item to the end to mark it as recently used | |
| self.cache.move_to_end(url) | |
| self.hits += 1 | |
| if second_try: | |
| # In the first try we didn't get the cache hit, probably because it was a shortened URL | |
| # So me decrease the number of misses, because we got the cache hit in the end | |
| self.misses -= 1 | |
| return ( | |
| self.cache[url]["title"], | |
| self.cache[url]["text"], | |
| self.cache[url][f"summary_{summary_type}"], | |
| ) | |
| else: | |
| if not second_try: | |
| self.misses += 1 | |
| return None, None, None | |
| def get_cache_stats(self): | |
| return self.hits, self.misses, len(self.cache) | |