Caching pattern: Cache-Aside

[christofferh]

Implementation of #440, (+ minor style fixes)

I'll update documentation & UML once the solution has been reviewed and approved.

[coveralls]

Coverage decreased (-0.3%) to 83.995% when pulling b31edda on christofferh:feat/cache-aside into 6026eed on iluwatar:master.

[iluwatar]

@christofferh the implementation looks good. Please update the documentation so we can proceed with the merge.

[chinnachalam]

Is there any reason for not using logging framework like SLF4J or LOG4J Or Common logging?

[iluwatar]

@chinnachalam you are right, using a logging framework would give some advantages such as ability to redirect output and filter output based on logging levels. But I think we should handle this issue on a more general level since there are multiple patterns not using a logging framework at the moment. Would you raise an issue about this matter, please?

[christofferh]

@iluwatar, docs and and diagram added.

Sidenote: +1 for #190, as an intellij user the diagram generation part was not that enjoyable :)

[coveralls]

Coverage decreased (-0.03%) to 84.301% when pulling f114b5b on christofferh:feat/cache-aside into 6026eed on iluwatar:master.

[iluwatar]

Thank you @christofferh for this addition 👍