class ActiveSupport::Cache::Store

def read(name, options = nil)

Options are passed to the underlying cache implementation.

+nil+ is returned.
the cache with the given key, then that data is returned. Otherwise,
Fetches data from the cache, using the given key. If there is data in 
def read(name, options = nil)
  options = merged_options(options)
  key = namespaced_key(name, options)
  instrument(:read, name, options) do |payload|
    entry = read_entry(key, options)
    if entry
      if entry.expired?
        delete_entry(key, options)
        payload[:hit] = false if payload
        nil
      else
        payload[:hit] = true if payload
        entry.value
      end
    else
      payload[:hit] = false if payload
      nil
    end
  end
end