Metasploit Framework
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Most caching libraries don't do locking, meaning that >1 process can be calculating a cached value at the same time. Since you presumably cache things because they cost CPU, database reads, or money, doesn't it make sense to lock while caching?
Grape + Goliath + ActiveRecord High concurrency API framework
It will fetch the countries and according to that fetch the state of that countries, currently it is for countries listing
Her is an ORM (Object Relational Mapper) that maps REST resources to Ruby objects. It is designed to build applications that are powered by a RESTful API instead of a database.