mongodb/mongo-ruby-driver — pull request #253 by durran (2013-08-19 19:21:05+00:00)
Title: RUBY-589 Implement new Cluster Model

Simple and straightforward cluster as we discussed. Only provides a `nodes` method to get a list of all candidate nodes (nodes that can be operated on), and an `add` method for auto-discovery to be able to add a newly discovered node from an `ismaster` command to the cluster.

Node will have the threaded healthchecks encapsulated within it, there's no need to actually have cluster receive any status updates - it only cares when someone wants a node list.