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# Copyright (C) 2016 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
# Subscribes to Topology Changed events and logs them.
#
# @since 2.4.0
class TopologyChangedLogSubscriber < SDAMLogSubscriber
private
def log_event(event)
if event.previous_topology != event.new_topology
log_debug(
"Topology type '#{event.previous_topology.display_name.downcase}' changed to " +
"type '#{event.new_topology.display_name.downcase}'."
)
else
log_debug(
"There was a change in the members of the '#{event.new_topology.display_name.downcase}' " +
"topology."
)
end
end
end
end
end
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