Sinatra with a persistent variable

Question

My sinatra app has to parse a ~60MB XML-file. This file hardly ever changes: on a nightly cron job, It is overwritten with another one.

Are there tricks or ways to

Answer 1

Two options:

• Save the parsed file to a new file and always read that one.

You can save in a file – serialize - a hash with two keys: 'last-modified' and 'data'.

The 'last-modified' value is a date and you check in every request if that day is today. If it is not today then a new file is downloaded, parsed and stored with today's date.

The 'data' value is the parsed file.

That way you parse just once time, sort of a cache.

• Save the parsed file to a NoSQL database, for example redis.