gistfile1.rb

require "redis"

Redis.current.del("test")

def do_set!
  did_set = nil

  Redis.current.pipelined do
    did_set = Redis.current.setnx("test", "ja")
    Redis.current.expire("test", 3600)
  end
  did_set.value
end

p do_set!
p do_set!