Decorator @cached creates cache with the Cache() factory

[padraic-shafer]

• See #473 ~~: Deprecate using cache specific constructors~~ ~~* https://github.com/aio-libs/aiocache/issues/473~~
  • Cache class was introduced as a proxy for instantiating the different backends. There should be only one way of doing things and Cache is the preferred way of doing that so will deprecate the others.
• This is now applied to cached._get_cache()

What do these changes do?

Decorator @cached creates cache with the Cache() factory constructor, instead of the cache-specific constructor.

Are there changes in behavior for the user?

This should be invisible to the end user.

Related issue number

#473: Deprecate using cache specific constructors

Checklist

• [X] I think the code is well written
• [ ] Unit tests for the changes exist
• [ ] Documentation reflects the changes
• [ ] Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[padraic-shafer]

Hi, do you have an feedback for this PR?

[Dreamsorcerer]

As mentioned in that issue, doesn't look like the deprecation has actually happened yet. But, might as well update this.

[codecov[bot]]

Codecov Report

Merging #568 (c17933e) into master (e64ff89) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #568   +/-   ##
=======================================
  Coverage   99.60%   99.60%           
=======================================
  Files          36       36           
  Lines        3560     3560           
  Branches      447      447           
=======================================
  Hits         3546     3546           
  Misses         12       12           
  Partials        2        2           

Flag	Coverage Δ
unit	99.57% <100.00%> (ø)

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Impacted Files	Coverage Δ
aiocache/decorators.py	100.00% <100.00%> (ø)

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