# persistent-cache-decorator
[](https://pypi.org/project/persistent-cache-decorator)
[](https://pypi.org/project/persistent-cache-decorator)
[](https://results.pre-commit.ci/latest/github/FlavioAmurrioCS/persistent-cache-decorator/main)
-----
**Table of Contents**
- [persistent-cache-decorator](#persistent-cache-decorator)
- [Installation](#installation)
- [Usage](#usage)
- [Cached Property](#cached-property)
- [Creating a custom cache backend](#creating-a-custom-cache-backend)
- [License](#license)
## Installation
```console
pip install persistent-cache-decorator
```
## Usage
```python
from __future__ import annotations
import time
from persistent_cache.backend import CacheBackend
from persistent_cache.decorators import json_cache
from persistent_cache.decorators import persistent_cache
@persistent_cache(minutes=4)
def long_func(n: int) -> str:
"""Long Func Documentation."""
# Long function
time.sleep(n)
return f"{n}"
# reveal_type(long_func)
# Runtime type is "_persistent_cache"
# <persistent_cache_decorator._persistent_cache object at 0x10468be50>
# Call function(takes 5 seconds)
long_func(5)
"5"
# Call function again (takes 0 seconds)
long_func(5)
"5"
# Bypass caching(takes 5 seconds)
long_func.no_cache_call(5)
"5"
# Call function again (takes 0 seconds)
long_func(5)
"5"
# Clear cache for this function
long_func.cache_clear()
# Call function(takes 5 seconds)
long_func(5)
```
## Cached Property
```python
from typing import NamedTuple # noqa: E402
from persistent_cache.decorators import json_cached_property # noqa: E402
# To cache instance methods, use the json_cache decorator you can do the following:
# Reference: https://www.youtube.com/watch?v=sVjtp6tGo0g
class Pet:
def __init__(self, name: str, age: int) -> None:
self.name = name
self.age = age
# creating the cache function this way will allow the cache to be cleared using the instance
# It will also only use the arguments as the key
self.online_information = json_cache(days=2)(self._online_information)
def _online_information(self, source: str) -> int:
# Something that takes a long time
return len(source)
pet = Pet("Rex", 5)
pet.online_information(source="https://api.github.com/users/rex")
pet.online_information.cache_clear()
# NEW: or you can use the json_cached_property decorator to cache the result of a method
# This makes use of Python's Descriptors: https://www.youtube.com/watch?v=vBys0SwYvCQ
class Person(NamedTuple):
name: str
age: int
# The decorator works with Namedtuples as well as with classes
@json_cached_property(days=2)
def online_information(self, source: str) -> int:
# Something that takes a long time
return len(source)
person = Person("John", 30)
# The following call will cache the result using the class instance as well as the arguments as the key # noqa: E501
person.online_information(source="https://api.github.com/users/john")
# To clear the cache, use the method from the class directly
Person.online_information.cache_clear()
```
## Creating a custom cache backend
```python
from typing_extensions import Any # noqa: E402
from typing import Callable # noqa: E402
from persistent_cache.decorators import cache_decorator_factory # noqa: E402
from typing import TYPE_CHECKING # noqa: E402
if TYPE_CHECKING:
import datetime
from persistent_cache.decorators import _R
# Define a custom cache backend
class RedisCacheBackend(CacheBackend):
def get_cache_or_call( # type: ignore[empty-body]
self,
*,
func: Callable[..., _R],
args: tuple[Any, ...],
kwargs: dict[str, Any],
lifespan: datetime.timedelta,
) -> _R:
...
def del_func_cache(self, *, func: Callable[..., Any]) -> None:
...
# Singleton Instance
REDIS_CACHE_BACKEND = RedisCacheBackend()
# Quick way of defining a decorator. You can use this if you want multiple decorators with different cache durations. # noqa: E501
redis_cache = cache_decorator_factory(backend=REDIS_CACHE_BACKEND)
@redis_cache(days=1)
def foo(time: float) -> float:
from time import sleep
sleep(time)
return time
```
## License
`persistent-cache-decorator` is distributed under the terms of the [MIT](https://spdx.org/licenses/MIT.html) license.
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