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# frozen_string_literal: true
# rubocop:todo all
# Copyright (C) 2015-2020 MongoDB Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
module Mongo
class Cluster
module Topology
# Defines behavior for when a cluster is in an unknown state.
#
# @since 2.0.0
class Unknown < Base
include NoReplicaSetOptions
# The display name for the topology.
#
# @since 2.0.0
NAME = 'Unknown'.freeze
# Get the display name.
#
# @example Get the display name.
# Unknown.display_name
#
# @return [ String ] The display name.
#
# @since 2.0.0
def display_name
self.class.name.gsub(/.*::/, '')
end
# @note This method is experimental and subject to change.
#
# @api experimental
# @since 2.7.0
def summary
details = server_descriptions.keys.join(',')
"#{display_name}[#{details}]"
end
# Determine if the topology would select a readable server for the
# provided candidates and read preference.
#
# @example Is a readable server present?
# topology.has_readable_server?(cluster, server_selector)
#
# @param [ Cluster ] cluster The cluster.
# @param [ ServerSelector ] server_selector The server
# selector.
#
# @return [ false ] An Unknown topology will never have a readable server.
#
# @since 2.4.0
def has_readable_server?(cluster, server_selector = nil); false; end
# Determine if the topology would select a writable server for the
# provided candidates.
#
# @example Is a writable server present?
# topology.has_writable_server?(servers)
#
# @param [ Cluster ] cluster The cluster.
#
# @return [ false ] An Unknown topology will never have a writable server.
#
# @since 2.4.0
def has_writable_server?(cluster); false; end
# An unknown topology is not a replica set.
#
# @example Is the topology a replica set?
# Unknown.replica_set?
#
# @return [ false ] Always false.
#
# @since 2.0.0
def replica_set?; false; end
# Select appropriate servers for this topology.
#
# @example Select the servers.
# Unknown.servers(servers)
#
# @param [ Array<Server> ] servers The known servers.
#
# @raise [ Unknown ] Cannot select servers when the topology is
# unknown.
#
# @since 2.0.0
def servers(servers)
[]
end
# An unknown topology is not sharded.
#
# @example Is the topology sharded?
# Unknown.sharded?
#
# @return [ false ] Always false.
#
# @since 2.0.0
def sharded?; false; end
# An unknown topology is not single.
#
# @example Is the topology single?
# Unknown.single?
#
# @return [ true ] Always false.
#
# @since 2.0.0
def single?; false; end
# An unknown topology is unknown.
#
# @example Is the topology unknown?
# Unknown.unknown?
#
# @return [ true ] Always true.
#
# @since 2.0.0
def unknown?; true; end
end
end
end
end
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