Class: Backoff

Inherits:
Delegator
  • Object
show all
Defined in:
lib/backoff.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(object, exception_classes, logger, options = {}) ⇒ Backoff 



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# File 'lib/backoff.rb', line 8

def initialize(object, exception_classes, logger, options = {})
  @exception_classes = exception_classes
  @delegate_sd_obj = object
  @logger = logger
  @sleeper = options[:sleeper] || Kernel.method(:sleep)
  @initial_backoff = options[:initial_backoff] || 1
  @multiplier = options[:multiplier] || 2
  @random = options[:random] || Random.new
  @jitter = options[:jitter] || lambda {|delay| @random.rand(0..delay.to_f) }
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args, &block) ⇒ Object 



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# File 'lib/backoff.rb', line 23

def method_missing(sym, *args, &block)
  _with_backoff { super }
end

Class Method Details

.wrap(object, exception_classes, logger, options) ⇒ Object 



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# File 'lib/backoff.rb', line 3

def self.wrap(object, exception_classes, logger, options)
  return object if object.is_a?(self.class)
  new(object, exception_classes, logger, options)
end

Instance Method Details

#__getobj__ ⇒ Object 



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# File 'lib/backoff.rb', line 19

def __getobj__
  @delegate_sd_obj
end

#_with_backoff(backoff = @initial_backoff) ⇒ Object 



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# File 'lib/backoff.rb', line 27

def _with_backoff(backoff = @initial_backoff)
  yield
rescue *@exception_classes => e
  jittered_backoff = @jitter.call(backoff)
  @logger.error "Got #{e.class}, sleeping #{jittered_backoff}"
  @sleeper.call(backoff)
  @logger.info "Woke up after #{e.class} retrying again"
  backoff *= @multiplier
  retry
end