Refactor: Unified Cache Design

[you-n-g]

🌟 Feature Description

Simplify Cache Design

Motivation

Currently, RD-Agent has a lot of repeatitive cache implementation(e.g. #415)
We can have a shared cache implement and provide a design that will not affect the readability of the main code.

• The shared cache design including:
  • storage
  • handling multi-processing
  • key getter function
  • cache invalidation machenism
  • ....

Here are some example:

Example1...

Code without cache

def f(...):
   ...

Code with cache.

@cache(key=a_func_to_gen_cache_key, drop_cache_mechanism=...)
def f(...):
   ...

Example2...

Code without cache

<a block of code>

Code with cache.

@cache(...)
def _f(...)
    <a block of code>
    return ...
_f(...)