class Gem::Resolver::BestSet

def find_all(req) # :nodoc:
  pick_sets if @remote and @sets.empty?
  super
rescue Gem::RemoteFetcher::FetchError => e
  replace_failed_api_set e
  retry
end

def initialize(sources = Gem.sources)
  super()
  @sources = sources
end

def pick_sets # :nodoc:
  @sources.each_source do |source|
    @sets << source.dependency_resolver_set
  end
end

def prefetch(reqs) # :nodoc:
  pick_sets if @remote and @sets.empty?
  super
end

def pretty_print(q) # :nodoc:
  q.group 2, '[BestSet', ']' do
    q.breakable
    q.text 'sets:'
    q.breakable
    q.pp @sets
  end
end

def replace_failed_api_set(error) # :nodoc:
  uri = error.uri
  uri = URI uri unless URI === uri
  uri = uri + "."
  raise error unless api_set = @sets.find do |set|
    Gem::Resolver::APISet === set and set.dep_uri == uri
  end
  index_set = Gem::Resolver::IndexSet.new api_set.source
  @sets.map! do |set|
    next set unless set == api_set
    index_set
  end
end