class NewRelic::Agent::EventLoop
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# File lib/new_relic/agent/event_loop.rb, line 58 def initialize @self_pipe_rd, @self_pipe_wr = IO.pipe @event_queue = Queue.new @stopped = false @timers = {} @subscriptions = Hash.new { |h, k| h[k] = [] } @subscriptions[:__add_timer] << proc { |t| set_timer(t) } @subscriptions[:__add_event] << proc { |e, blk| @subscriptions[e] << blk } end
Public Instance Methods
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# File lib/new_relic/agent/event_loop.rb, line 144 def dispatch_event(event, args) NewRelic::Agent.logger.debug("EventLoop: Dispatching event '#{event}' with #{@subscriptions[event].size} callback(s).") errors = [] @subscriptions[event].each do |s| begin s.call(*args) rescue NewRelic::Agent::ForceRestartException, NewRelic::Agent::ForceDisconnectException raise rescue => e errors << e end end if !errors.empty? ::NewRelic::Agent.logger.error("#{errors.size} error(s) running task for event '#{event}' in agent event loop:", *errors) end end
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# File lib/new_relic/agent/event_loop.rb, line 171 def fire(event, *args) @event_queue << [event, args] wakeup end
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# File lib/new_relic/agent/event_loop.rb, line 181 def fire_after(interval, event) ::NewRelic::Agent.logger.debug("Firing event #{event} after #{interval} seconds.") fire(:__add_timer, Timer.new(interval, event, false)) end
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# File lib/new_relic/agent/event_loop.rb, line 176 def fire_every(interval, event) ::NewRelic::Agent.logger.debug("Firing event #{event} every #{interval} seconds.") fire(:__add_timer, Timer.new(interval, event, true)) end
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# File lib/new_relic/agent/event_loop.rb, line 133 def fire_timer(timer) if timer.due? @event_queue << [timer.event] timer.set_fired_time end end
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# File lib/new_relic/agent/event_loop.rb, line 127 def fire_timers @timers.each do |event, timer| fire_timer(timer) end end
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# File lib/new_relic/agent/event_loop.rb, line 82 def next_timeout return nil if @timers.empty? timeout = @timers.values.map(&:next_fire_time).min - Process.clock_gettime(Process::CLOCK_REALTIME) [timeout, 0].max end
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# File lib/new_relic/agent/event_loop.rb, line 167 def on(event, &blk) fire(:__add_event, event, blk) end
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# File lib/new_relic/agent/event_loop.rb, line 140 def prune_timers @timers.delete_if { |e, t| t.finished? } end
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# File lib/new_relic/agent/event_loop.rb, line 163 def reschedule_timer_for_event(e) @timers[e]&.reschedule end
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# File lib/new_relic/agent/event_loop.rb, line 98 def run ::NewRelic::Agent.logger.debug('Running event loop') while !stopped? run_once end end
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# File lib/new_relic/agent/event_loop.rb, line 105 def run_once(nonblock = false) wait_to_run(nonblock) prune_timers fire_timers until @event_queue.empty? evt, args = @event_queue.pop dispatch_event(evt, args) reschedule_timer_for_event(evt) end end
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# File lib/new_relic/agent/event_loop.rb, line 69 def set_timer(timer) existing_timer = @timers[timer.event] if existing_timer elapsed_interval = Process.clock_gettime(Process::CLOCK_REALTIME) - existing_timer.last_interval_start timer.advance(elapsed_interval) end @timers[timer.event] = timer fire_timer(timer) end
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# File lib/new_relic/agent/event_loop.rb, line 93 def stop @stopped = true wakeup end
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# File lib/new_relic/agent/event_loop.rb, line 118 def wait_to_run(nonblock) timeout = nonblock ? 0 : next_timeout ready = IO.select([@self_pipe_rd], nil, nil, timeout) if ready && ready[0] && ready[0][0] && ready[0][0] == @self_pipe_rd @self_pipe_rd.read(1) end end
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# File lib/new_relic/agent/event_loop.rb, line 186 def wakeup begin @self_pipe_wr.write_nonblock('.') rescue Errno::EAGAIN ::NewRelic::Agent.logger.debug('Failed to wakeup event loop') end end