| 367 | |
| 368 | |
| 369 | class CacheInstance(Dict[str, Any]): |
| 370 | __slots__ = ["timeout", "name", "_timetable"] |
| 371 | |
| 372 | def __init__(self, name="noname", timeout=None): |
| 373 | # type: (str, Optional[int]) -> None |
| 374 | self.timeout = timeout |
| 375 | self.name = name |
| 376 | self._timetable = {} # type: Dict[str, float] |
| 377 | |
| 378 | def flush(self): |
| 379 | # type: () -> None |
| 380 | self._timetable.clear() |
| 381 | self.clear() |
| 382 | |
| 383 | def __getitem__(self, item): |
| 384 | # type: (str) -> Any |
| 385 | if item in self.__slots__: |
| 386 | return object.__getattribute__(self, item) |
| 387 | if not self.__contains__(item): |
| 388 | raise KeyError(item) |
| 389 | return super(CacheInstance, self).__getitem__(item) |
| 390 | |
| 391 | def __contains__(self, item): |
| 392 | if not super(CacheInstance, self).__contains__(item): |
| 393 | return False |
| 394 | if self.timeout is not None: |
| 395 | t = self._timetable[item] |
| 396 | if time.time() - t > self.timeout: |
| 397 | return False |
| 398 | return True |
| 399 | |
| 400 | def get(self, item, default=None): |
| 401 | # type: (str, Optional[Any]) -> Any |
| 402 | # overloading this method is needed to force the dict to go through |
| 403 | # the timetable check |
| 404 | try: |
| 405 | return self[item] |
| 406 | except KeyError: |
| 407 | return default |
| 408 | |
| 409 | def __setitem__(self, item, v): |
| 410 | # type: (str, str) -> None |
| 411 | if item in self.__slots__: |
| 412 | return object.__setattr__(self, item, v) |
| 413 | self._timetable[item] = time.time() |
| 414 | super(CacheInstance, self).__setitem__(item, v) |
| 415 | |
| 416 | def update(self, |
| 417 | other, # type: Any |
| 418 | **kwargs # type: Any |
| 419 | ): |
| 420 | # type: (...) -> None |
| 421 | for key, value in other.items(): |
| 422 | # We only update an element from `other` either if it does |
| 423 | # not exist in `self` or if the entry in `self` is older. |
| 424 | if key not in self or self._timetable[key] < other._timetable[key]: |
| 425 | dict.__setitem__(self, key, value) |
| 426 | self._timetable[key] = other._timetable[key] |