lib/zold/metronome.rb
# frozen_string_literal: true
# Copyright (c) 2018-2023 Zerocracy
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the 'Software'), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
require 'backtrace'
require_relative 'log'
require_relative 'age'
require_relative 'endless'
require_relative 'verbose_thread'
require_relative 'thread_pool'
# Background routines.
# Author:: Yegor Bugayenko (yegor256@gmail.com)
# Copyright:: Copyright (c) 2018 Yegor Bugayenko
# License:: MIT
module Zold
# Metronome
class Metronome
def initialize(log = Log::NULL)
@log = log
@routines = []
@threads = ThreadPool.new('metronome', log: log)
@failures = {}
end
def to_text
[
Time.now.utc.iso8601,
'Current threads:',
@threads.to_s,
'Failures:',
@failures.map { |r, f| "#{r}\n#{f}\n" }
].flatten.join("\n\n")
end
def add(routine)
@routines << routine
@log.info("Added #{routine.class.name} to the metronome")
end
def start
@routines.each_with_index do |r, idx|
@threads.add do
step = 0
Endless.new("#{r.class.name}-#{idx}", log: @log).run do
Thread.current.thread_variable_set(:start, Time.now)
step += 1
begin
r.exec(step)
@log.debug("Routine #{r.class.name} ##{step} done \
in #{Age.new(Thread.current.thread_variable_get(:start))}")
rescue StandardError => e
@failures[r.class.name] = "#{Time.now.utc.iso8601}\n#{Backtrace.new(e)}"
@log.error("Routine #{r.class.name} ##{step} failed \
in #{Age.new(Thread.current.thread_variable_get(:start))}")
raise e
end
sleep(1)
end
end
end
begin
yield(self)
ensure
@threads.kill
end
end
end
end