Class: Snmp2mkr::EngineThreads::Timer

Inherits:
Object
  • Object
show all
Defined in:
lib/snmp2mkr/engine_threads/timer.rb

Defined Under Namespace

Classes: Entry

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(logger: Logger.new($stdout)) ⇒ Timer

Returns a new instance of Timer.



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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 6

def initialize(logger: Logger.new($stdout))
  @shutdown = false
  @entries = []
  @logger = logger
  @thread = nil
end

Instance Attribute Details

#entries ⇒ Object (readonly)

Returns the value of attribute entries.



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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 13

def entries
  @entries
end

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 13

def logger
  @logger
end

#thread ⇒ Object (readonly)

Returns the value of attribute thread.



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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 13

def thread
  @thread
end

Instance Method Details

#add(interval, &hook) ⇒ Object 



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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 15

def add(interval, &hook)
  entry = Entry.new(interval, hook, now - interval + rand(15))
  logger.info "Added timer #{entry.inspect}"
  @entries << entry
end

#join ⇒ Object 



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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 25

def join
  return unless running?
  @thread.join
end

#kick(entry) ⇒ Object 



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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 61

def kick(entry)
  logger.debug "timer kick entry #{entry.inspect}"
  entry.last = now
  Thread.new do
    begin
      entry.hook.call
    rescue Exception => e
      logger.error "#{e.inspect}\n\t#{e.backtrace.join("\n\t")}"
    end
  end
end

#main_loop ⇒ Object 



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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 41

def main_loop
  logger.info "timer started"
  loop do
    break if @shutdown
    tick
    sleep 1
  end
  logger.info "timer shutdown"
rescue Exception => e
  logger.error "#{e.inspect}\n\t#{e.backtrace.join("\n\t")}"
  retry
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 21

def running?
  @thread && @thread.alive?
end

#start ⇒ Object 



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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 30

def start
  return if running?
  @shutdown = false
  @thread = Thread.new(&method(:main_loop))
end

#stop ⇒ Object 



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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 36

def stop
  return unless running?
  @shutdown = true
end

#tick ⇒ Object 



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# File 'lib/snmp2mkr/engine_threads/timer.rb', line 54

def tick
  t = now
  @entries.each do |entry|
    kick(entry) if (now - entry.last) > entry.interval
  end
end