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# Copyright (C) 2014-2017 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
# A manager that calls #execute on its executors at a regular interval.
#
# @api private
#
# @since 2.5.0
class PeriodicExecutor
# The default time interval for the periodic executor to execute.
#
# @since 2.5.0
FREQUENCY = 5
# Create a periodic executor.
#
# @example Create a PeriodicExecutor.
# Mongo::Cluster::PeriodicExecutor.new(reaper, reaper2)
#
# @api private
#
# @since 2.5.0
def initialize(*executors)
@thread = nil
@executors = executors
end
# Start the thread.
#
# @example Start the periodic executor's thread.
# periodic_executor.run!
#
# @api private
#
# @since 2.5.0
def run!
@thread && @thread.alive? ? @thread : start!
end
alias :restart! :run!
# Stop the executor's thread.
#
# @example Stop the executors's thread.
# periodic_executor.stop!
#
# @api private
#
# @since 2.5.0
def stop!
begin; flush; rescue; end
@thread.kill && @thread.stop?
end
# Trigger an execute call on each reaper.
#
# @example Trigger all reapers.
# periodic_executor.execute
#
# @api private
#
# @since 2.5.0
def execute
@executors.each(&:execute) and true
end
# Execute all pending operations.
#
# @example Execute all pending operations.
# periodic_executor.flush
#
# @api private
#
# @since 2.5.0
def flush
@executors.each(&:flush) and true
end
private
def start!
@thread = Thread.new(FREQUENCY) do |i|
loop do
sleep(i)
execute
end
end
end
end
end
end
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