Class: Fluent::FlowCounterSimpleOutput

Inherits:
Output
  • Object
show all
Defined in:
lib/fluent/plugin/out_flowcounter_simple.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#last_checked ⇒ Object

Returns the value of attribute last_checked.



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# File 'lib/fluent/plugin/out_flowcounter_simple.rb', line 8

def last_checked
  @last_checked
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_flowcounter_simple.rb', line 10

def configure(conf)
  super

  @indicator_proc =
    case @indicator
    when 'num'  then Proc.new {|record| 1 }
    when 'byte' then Proc.new {|record| record.to_msgpack.size }
    else
      raise Fluent::ConfigError, "flowcounter-simple count allows num/byte"
    end
  @unit =
    case @unit
    when 'second' then :second
    when 'minute' then :minute
    when 'hour' then :hour
    when 'day' then :day
    else
      raise Fluent::ConfigError, "flowcounter-simple unit allows second/minute/hour/day"
    end
  @tick =
    case @unit
    when :second then 1
    when :minute then 60
    when :hour then 3600
    when :day then 86400
    else
      raise RuntimeError, "@unit must be one of second/minute/hour/day"
    end

  @output_proc =
    if @comment
      Proc.new {|count| "plugin:out_flowcounter_simple\tcount:#{count}\tindicator:#{@indicator}\tunit:#{@unit}\tcomment:#{@comment}" }
    else
      Proc.new {|count| "plugin:out_flowcounter_simple\tcount:#{count}\tindicator:#{@indicator}\tunit:#{@unit}" }
    end

  @count = 0
  @mutex = Mutex.new
end

#countup(count) ⇒ Object 



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# File 'lib/fluent/plugin/out_flowcounter_simple.rb', line 61

def countup(count)
  @mutex.synchronize {
    @count = (@count || 0) + count
  }
end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_flowcounter_simple.rb', line 92

def emit(tag, es, chain)
  count = 0
  es.each {|time,record|
    count += @indicator_proc.call(record)
  }
  countup(count)

  chain.next
end

#flush_emit(step) ⇒ Object 



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# File 'lib/fluent/plugin/out_flowcounter_simple.rb', line 67

def flush_emit(step)
  count, @count = @count, 0
  if count > 0
    $log.info @output_proc.call(count)
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_flowcounter_simple.rb', line 55

def shutdown
  super
  @watcher.terminate
  @watcher.join
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_flowcounter_simple.rb', line 50

def start
  super
  start_watch
end

#start_watch ⇒ Object 



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# File 'lib/fluent/plugin/out_flowcounter_simple.rb', line 74

def start_watch
  # for internal, or tests only
  @watcher = Thread.new(&method(:watch))
end

#watch ⇒ Object 



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# File 'lib/fluent/plugin/out_flowcounter_simple.rb', line 79

def watch
  # instance variable, and public accessable, for test
  @last_checked = Fluent::Engine.now
  while true
    sleep 0.1
    if Fluent::Engine.now - @last_checked >= @tick
      now = Fluent::Engine.now
      flush_emit(now - @last_checked)
      @last_checked = now
    end
  end
end