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# Copyright (C) 2015 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
module Event
# This handles member discovered events for server descriptions.
#
# @since 2.4.0
class MemberDiscovered
include Monitoring::Publishable
# @return [ Mongo::Cluster ] cluster The cluster.
attr_reader :cluster
# @return [ Hash ] options The options.
attr_reader :options
# @return [ Monitoring ] monitoring The monitoring.
attr_reader :monitoring
# Initialize the new member discovered event handler.
#
# @example Create the new handler.
# MemberDiscovered.new(cluster)
#
# @param [ Mongo::Cluster ] cluster The cluster to publish from.
#
# @since 2.0.0
def initialize(cluster)
@cluster = cluster
@options = cluster.options
@monitoring = cluster.monitoring
end
# This event tells the cluster that a member of a topology is discovered.
#
# @example Handle the event.
# member_discovered.handle(previous_description, description)
#
# @param [ Server::Description ] previous The previous description of the server.
# @param [ Server::Description ] updated The updated description of the server.
#
# @since 2.4.0
def handle(previous, updated)
if updated.primary? || updated.mongos?
cluster.elect_primary!(updated)
else
cluster.member_discovered
end
end
end
end
end
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