Class: Zold::Metronome

Inherits:
Object
  • Object
show all
Defined in:
lib/zold/metronome.rb

Overview

Metronome

Instance Method Summary collapse

Constructor Details

#initialize(log = Log::Quiet.new) ⇒ Metronome

Returns a new instance of Metronome.



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# File 'lib/zold/metronome.rb', line 35

def initialize(log = Log::Quiet.new)
  @log = log
  @routines = []
  @threads = []
  @starts = {}
  @failures = {}
end

Instance Method Details

#add(routine) ⇒ Object 



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# File 'lib/zold/metronome.rb', line 59

def add(routine)
  @routines << routine
  @log.info("Added #{routine.class.name} to the metronome")
end

#start ⇒ Object 



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# File 'lib/zold/metronome.rb', line 64

def start
  alive = true
  @routines.each_with_index do |r, idx|
    @threads << Thread.start do
      Thread.current.abort_on_exception = true
      Thread.current.name = "#{r.class.name}-#{idx}"
      step = 0
      while alive
        @starts[Thread.current] = Time.now
        begin
          r.exec(step)
          @log.info("Routine #{r.class.name} ##{step} done in #{Age.new(@starts[Thread.current])}")
        rescue StandardError => e
          @failures[r.class.name] = Time.now.utc.iso8601 + "\n" + Backtrace.new(e).to_s
          @log.error("Routine #{r.class.name} ##{step} failed in #{Age.new(@starts[Thread.current])}")
          @log.error(Backtrace.new(e).to_s)
        end
        step += 1
        sleep(1)
      end
    end
  end
  begin
    yield(self)
  ensure
    alive = false
    @log.info("Stopping the metronome with #{@threads.count} threads: #{@threads.map(&:name).join(', ')}")
    start = Time.now
    @threads.each do |t|
      tstart = Time.now
      if t.join(60)
        @log.info("Thread #{t.name} finished in #{Age.new(tstart)}")
      else
        t.exit
        @log.info("Thread #{t.name} killed in #{Age.new(tstart)}")
      end
    end
    @log.info("Metronome stopped in #{Age.new(start)}, #{@failures.count} failures")
  end
end

#to_text ⇒ Object 



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# File 'lib/zold/metronome.rb', line 43

def to_text
  [
    Time.now.utc.iso8601,
    'Current threads:',
    @threads.map do |t|
      [
        "#{t.name}: status=#{t.status}; alive=#{t.alive?}",
        "Most recent start: #{Age.new(@starts[t])} ago",
        t.backtrace.nil? ? 'NO BACKTRACE' : "  #{t.backtrace.join("\n  ")}"
      ].join("\n")
    end,
    'Failures:',
    @failures.map { |r, f| "#{r}\n#{f}\n" }
  ].flatten.join("\n\n")
end