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# frozen_string_literal: true
# rubocop:todo all
# Copyright (C) 2016-2020 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 Monitoring
module Event
# Event fired when the topology changes.
#
# @since 2.4.0
class TopologyChanged < Mongo::Event::Base
# @return [ Cluster::Topology ] previous_topology The previous topology.
attr_reader :previous_topology
# @return [ Cluster::Topology ] new_topology The new topology.
attr_reader :new_topology
# Create the event.
#
# @example Create the event.
# TopologyChanged.new(previous, new)
#
# @param [ Cluster::Topology ] previous_topology The previous topology.
# @param [ Cluster::Topology ] new_topology The new topology.
#
# @since 2.4.0
def initialize(previous_topology, new_topology)
@previous_topology = previous_topology
@new_topology = new_topology
end
# Returns a concise yet useful summary of the event.
#
# @return [ String ] String summary of the event.
#
# @note This method is experimental and subject to change.
#
# @since 2.7.0
# @api experimental
def summary
"#<#{short_class_name}" +
" prev=#{previous_topology.summary}" +
" new=#{new_topology.summary}>"
end
end
end
end
end
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