Description:
appjsonfilecache 0.2.2
Provides a function decorator that caches the return value in a JSON file in the appropriate application cache directory.
It requires all function parameters and return values to be encodeable to JSON, so that the cache is human-readable.
It supports a “vary” guard value (e.g. a data model version) that protects against using old versions of cache.
Additionally, a cheaper default function (e.g. returning shipped, precalculated values) can be specified as a stand-in
until an explicit recalculate function is called.
Usage
Example usage:
from app_json_file_cache import AppCache
cache = AppCache("myapp")
@cache("expensive")
def expensive_function():
return calculator()
More Example usage:
from app_json_file_cache import AppCache
cache = AppCache("myapp")
@cache("expensive", vary=VERSION)
def expensive_function(param):
return calculator(param)
expensive_function.recalculate(param1) # recalculate if external effects change
Using a default function until the next recalculate:
from app_json_file_cache import AppCache
cache = AppCache("myapp")
def cheap_standin(param):
return estimate(param)
@cache("expensive", vary=VERSION, cheap_default_func=cheap_standin)
def expensive_function(param):
return calculator(param)
expensive_function(param1) # cheap_standin is used
expensive_function.recalculate(param1) # cache is updated with expensive_function
expensive_function(param1) # cached value from expensive_function is used
Caveats
Names must be unique per app. If you reuse names, chaos ensues.
Each set of function parameter values creates a new file. This may lead to too many files in a directory on some systems.
Mixing positional and keyword arguments is not supported
It’s your responsibility that return values are serializable to JSON.
License
For personal and professional use. You cannot resell or redistribute these repositories in their original state.
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