class Aws::EndpointCache

def []=(key, value)
  @mutex.synchronize do
    # delete the least recent used endpoint when cache is full
    unless @entries.size < @max_entries
      old_key, = @entries.shift
      delete_polling_thread(old_key)
    end
    # delete old value if exists
    @entries.delete(key)
    @entries[key] = Endpoint.new(value.to_hash)
  end
end