Class: Fluent::Plugin::Buffer::Metadata

Inherits:
Struct
  • Object
show all
Defined in:
lib/fluent/plugin/buffer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(timekey, tag, variables) ⇒ Metadata 



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# File 'lib/fluent/plugin/buffer.rb', line 70

def initialize(timekey, tag, variables)
  super(timekey, tag, variables, 0)
end

Instance Attribute Details

#seq ⇒ Object

Returns the value of attribute seq



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# File 'lib/fluent/plugin/buffer.rb', line 69

def seq
  @seq
end

#tag ⇒ Object

Returns the value of attribute tag



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# File 'lib/fluent/plugin/buffer.rb', line 69

def tag
  @tag
end

#timekey ⇒ Object

Returns the value of attribute timekey



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# File 'lib/fluent/plugin/buffer.rb', line 69

def timekey
  @timekey
end

#variables ⇒ Object

Returns the value of attribute variables



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# File 'lib/fluent/plugin/buffer.rb', line 69

def variables
  @variables
end

Instance Method Details

#<=>(o) ⇒ Object 



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# File 'lib/fluent/plugin/buffer.rb', line 120

def <=>(o)
  timekey2 = o.timekey
  tag2 = o.tag
  variables2 = o.variables
  if (!!timekey ^ !!timekey2) || (!!tag ^ !!tag2) || (!!variables ^ !!variables2)
    # One has value in a field, but another doesn't have value in same field
    # This case occurs very rarely
    if timekey == timekey2 # including the case of nil == nil
      if tag == tag2
        cmp_variables(variables, variables2)
      elsif tag.nil?
        -1
      elsif tag2.nil?
        1
      else
        tag <=> tag2
      end
    elsif timekey.nil?
      -1
    elsif timekey2.nil?
      1
    else
      timekey <=> timekey2
    end
  else
    # objects have values in same field pairs (comparison with non-nil and nil doesn't occur here)
    (timekey <=> timekey2 || 0).nonzero? || # if `a <=> b` is nil, then both are nil
      (tag <=> tag2 || 0).nonzero? ||
      cmp_variables(variables, variables2)
  end
end

#cmp_variables(v1, v2) ⇒ Object 



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# File 'lib/fluent/plugin/buffer.rb', line 84

def cmp_variables(v1, v2)
  if v1.nil? && v2.nil?
    return 0
  elsif v1.nil? # v2 is non-nil
    return -1
  elsif v2.nil? # v1 is non-nil
    return 1
  end
  # both of v1 and v2 are non-nil
  v1_sorted_keys = v1.keys.sort
  v2_sorted_keys = v2.keys.sort
  if v1_sorted_keys != v2_sorted_keys
    if v1_sorted_keys.size == v2_sorted_keys.size
      v1_sorted_keys <=> v2_sorted_keys
    else
      v1_sorted_keys.size <=> v2_sorted_keys.size
    end
  else
    v1_sorted_keys.each do |k|
      a = v1[k]
      b = v2[k]
      if a && b && a != b
        return a <=> b
      elsif a && b || (!a && !b) # same value (including both are nil)
        next
      elsif a # b is nil
        return 1
      else # a is nil (but b is non-nil)
        return -1
      end
    end

    0
  end
end

#dup_next ⇒ Object 



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

def dup_next
  m = dup
  m.seq = seq + 1
  m
end

#empty? ⇒ Boolean 



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# File 'lib/fluent/plugin/buffer.rb', line 80

def empty?
  timekey.nil? && tag.nil? && variables.nil?
end

#hash ⇒ Object

This is an optimization code. Current Struct’s implementation is comparing all data. github.com/ruby/ruby/blob/0623e2b7cc621b1733a760b72af246b06c30cf96/struct.c#L1200-L1203 Actually this overhead is very small but this class is generated *per chunk* (and used in hash object). This means that this class is one of the most called object in Fluentd. See github.com/fluent/fluentd/pull/2560



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# File 'lib/fluent/plugin/buffer.rb', line 157

def hash
  timekey.hash
end