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Intent

This challenge intends to get a sense of how do you solve certain architectural and design problems, and how well do you document and test your work.

The Challenge

Implement a Memcached server (TCP/IP socket) that complies with the specified protocol.

About Memcached:

Free & open-source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.

The server must listen for new connections on a given TCP port. The implementation must accept connections and commands from any Memcached client and respond appropriately.

Requirements

A subset of Memcached commands, with all of their allowed options, must be supported.

Retrieval commands:

  • get
  • gets

Storage commands:

  • set
  • add
  • replace
  • append
  • prepend
  • cas

Find the details about each command in the protocol's documentation (see the References section)

Each command should have a set of unit tests covering each case.

The project should have a README.md describing how to run the server, run a demo client, and issue sample commands, and how to run the tests.

Extras

  • Purge expired keys
  • Manage multiple clients
  • Design and include architectural diagrams

Deliverables

The codebase must be published on GitHub.

Gems can't be used, the only exception to this is rspec.

After completing the challenge, send an email to coding-challenge@moove-it.com including the GitHub’s repository url. Tag the version you want to deliver as 1.0.0.

References

Full list of commands: http://lzone.de/cheat-sheet/memcached

The protocol specification: https://github.com/memcached/memcached/blob/master/doc/protocol.txt