Class: Fluent::ElapsedTimeOutput

Inherits:
MultiOutput
  • Object
show all
Defined in:
lib/fluent/plugin/out_elapsed_time.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ElapsedTimeOutput

Returns a new instance of ElapsedTimeOutput.



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 33

def initialize
  super
  @outputs = []
  @elapsed = {}
  @emit_procs = []
end

Instance Attribute Details

#outputs ⇒ Object (readonly)

for test



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 41

def outputs
  @outputs
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 47

def configure(conf)
  super
  conf.elements.select {|e|
    e.name == 'store'
  }.each {|e|
    type = e['type']
    unless type
      raise ConfigError, "Missing 'type' parameter on <store> directive"
    end
    log.debug "adding store type=#{type.dump}"

    output = Plugin.new_output(type)
    output.configure(e)
    emit_proc = if output.respond_to?(:emit_events)
                  Proc.new {|output, tag, es, _chain| output.emit_events(tag, es)}
                else
                  Proc.new {|output, tag, es, _chain| output.emit(tag, es, NullOutputChain.instance)}
                end
    @emit_procs << emit_proc
    @outputs << output
  }

  case @aggregate
  when 'all'
    raise ConfigError, "out_elapsed_time: `tag` must be specified with aggregate all" if @tag.nil?
  when 'tag'
    raise ConfigError, "out_elapsed_time: `add_tag_prefix` or `remove_tag_prefix` must be specified with aggregate tag" if @add_tag_prefix.nil? and @remove_tag_prefix.nil?
  else
    raise ConfigError, "out_elapsed_time: aggregate allows `tag` or `all`"
  end

  @tag_proc = tag_proc

  @emit_proc =
    if @each == :message
      self.method(:emit_message)
    else
      self.method(:emit_es)
    end
end

#elapsed(tag = "elapsed") ⇒ Object

default: @tag



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 43

def elapsed(tag = "elapsed") # default: @tag
  @elapsed[tag] ||= []
end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 88

def emit(tag, es, chain)
  @emit_proc.call(tag, es)
  chain.next
end

#emit_es(tag, es) ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 107

def emit_es(tag, es)
  chain = NullOutputChain.instance
  t = Time.now
  @outputs.each_with_index {|output, idx|
    @emit_procs[idx].call(output, tag, es,chain)
  }
  emit_tag = @tag_proc.call(tag)
  elapsed(emit_tag) << (Time.now - t).to_f
end

#emit_message(tag, es) ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 93

def emit_message(tag, es)
  chain = NullOutputChain.instance
  start = Time.now
  es.each do |time, record|
    @outputs.each_with_index {|output, idx|
      @emit_procs[idx].call(output, tag, OneEventStream.new(time, record), chain)
    }
    finish = Time.now
    emit_tag = @tag_proc.call(tag)
    elapsed(emit_tag) << (finish - start).to_f
    start = finish
  end
end

#flush_emit ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 153

def flush_emit
  flushed_elapsed, @elapsed = @elapsed, initial_elapsed(@elapsed)
  messages = {}
  flushed_elapsed.each do |tag, elapsed|
    num = elapsed.size
    max = num == 0 ? 0 : elapsed.max
    avg = num == 0 ? 0 : elapsed.map(&:to_f).inject(:+) / num.to_f
    messages[tag] = {"max" => max, "avg" => avg, "num" => num}
  end
  messages.each {|tag, message| router.emit(tag, Engine.now, message) }
end

#initial_elapsed(prev_elapsed = nil) ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 117

def initial_elapsed(prev_elapsed = nil)
  return {} if !@zero_emit or prev_elapsed.nil?
  elapsed = {}
  prev_elapsed.keys.each do |tag|
    next if prev_elapsed[tag].empty? # Prohibit to emit anymore
    elapsed[tag] = []
  end
  elapsed
end

#run ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 142

def run
  @last_checked ||= Engine.now
  while (sleep 0.1)
    now = Engine.now
    if now - @last_checked >= @interval
      flush_emit
      @last_checked = now
    end
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 134

def shutdown
  @outputs.each {|o|
    o.shutdown
  }
  @thread.terminate
  @thread.join
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_elapsed_time.rb', line 127

def start
  @outputs.each {|o|
    o.start
  }
  @thread = Thread.new(&method(:run))
end