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Contents
# Copyright (C) 2018-2019 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 Server
# @api private
class RoundTripTimeAverager
# The weighting factor (alpha) for calculating the average moving
# round trip time.
RTT_WEIGHT_FACTOR = 0.2.freeze
private_constant :RTT_WEIGHT_FACTOR
def initialize
@last_round_trip_time = nil
@average_round_trip_time = nil
end
attr_reader :last_round_trip_time
attr_reader :average_round_trip_time
def measure
start = Time.now
begin
rv = yield
rescue Exception => exc
end
last_round_trip_time = Time.now - start
# If ismaster fails, we need to return the last round trip time
# because it is used in the heartbeat failed SDAM event,
# but we must not update the round trip time recorded in the server.
unless exc
@last_round_trip_time = last_round_trip_time
update_average_round_trip_time
end
[rv, exc, last_round_trip_time, average_round_trip_time]
end
private
# This method is separate for testing purposes.
def update_average_round_trip_time
@average_round_trip_time = if average_round_trip_time
RTT_WEIGHT_FACTOR * last_round_trip_time + (1 - RTT_WEIGHT_FACTOR) * average_round_trip_time
else
last_round_trip_time
end
end
end
end
end
Version data entries
33 entries across 33 versions & 2 rubygems