Class: NewRelic::TransactionSample::Segment

Inherits:
Object
  • Object
show all
Defined in:
lib/new_relic/transaction_sample/segment.rb

Direct Known Subclasses

CompositeSegment, FakeSegment, SummarySegment

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(timestamp, metric_name, segment_id) ⇒ Segment

Returns a new instance of Segment.



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# File 'lib/new_relic/transaction_sample/segment.rb', line 14

def initialize(timestamp, metric_name, segment_id)
  @entry_timestamp = timestamp
  @metric_name = metric_name || '<unknown>'
  @segment_id = segment_id || object_id
end

Instance Attribute Details

#entry_timestamp ⇒ Object (readonly)

Returns the value of attribute entry_timestamp.



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# File 'lib/new_relic/transaction_sample/segment.rb', line 6

def entry_timestamp
  @entry_timestamp
end

#exit_timestamp ⇒ Object (readonly)

The exit timestamp will be relative except for the outermost sample which will have a timestamp.



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# File 'lib/new_relic/transaction_sample/segment.rb', line 9

def exit_timestamp
  @exit_timestamp
end

#metric_name ⇒ Object (readonly)

Returns the value of attribute metric_name.



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# File 'lib/new_relic/transaction_sample/segment.rb', line 11

def metric_name
  @metric_name
end

#parent_segment ⇒ Object

Returns the value of attribute parent_segment.



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# File 'lib/new_relic/transaction_sample/segment.rb', line 10

def parent_segment
  @parent_segment
end

#segment_id ⇒ Object (readonly)

Returns the value of attribute segment_id.



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# File 'lib/new_relic/transaction_sample/segment.rb', line 12

def segment_id
  @segment_id
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 134

def [](key)
  params[key]
end

#[]=(key, value) ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 128

def []=(key, value)
  # only create a parameters field if a parameter is set; this will save
  # bandwidth etc as most segments have no parameters
  params[key] = value
end

#add_called_segment(s) ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 26

def add_called_segment(s)
  @called_segments ||= []
  @called_segments << s
  s.parent_segment = self
end

#called_segments ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 79

def called_segments
  @called_segments || []
end

#called_segments=(segments) ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 191

def called_segments=(segments)
  @called_segments = segments
end

#count_segments ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 99

def count_segments
  count = 1
  called_segments.each { | seg | count  += seg.count_segments }
  count
end

#duration ⇒ Object

return the total duration of this segment



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# File 'lib/new_relic/transaction_sample/segment.rb', line 84

def duration
  (@exit_timestamp - @entry_timestamp).to_f
end

#each_segment(&block) ⇒ Object

call the provided block for this segment and each of the called segments



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# File 'lib/new_relic/transaction_sample/segment.rb', line 144

def each_segment(&block)
  block.call self

  if @called_segments
    @called_segments.each do |segment|
      segment.each_segment(&block)
    end
  end
end

#each_segment_with_nest_tracking(&block) ⇒ Object

call the provided block for this segment and each of the called segments while keeping track of nested segments



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# File 'lib/new_relic/transaction_sample/segment.rb', line 156

def each_segment_with_nest_tracking(&block)
  summary = block.call self
  summary.current_nest_count += 1 if summary

  if @called_segments
    @called_segments.each do |segment|
      segment.each_segment_with_nest_tracking(&block)
    end
  end

  summary.current_nest_count -= 1 if summary
end

#end_trace(timestamp) ⇒ Object

sets the final timestamp on a segment to indicate the exit point of the segment



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# File 'lib/new_relic/transaction_sample/segment.rb', line 22

def end_trace(timestamp)
  @exit_timestamp = timestamp
end

#exclusive_duration ⇒ Object

return the duration of this segment without including the time in the called segments



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# File 'lib/new_relic/transaction_sample/segment.rb', line 90

def exclusive_duration
  d = duration

  called_segments.each do |segment|
    d -= segment.duration
  end
  d
end

#explain_sql ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 178

def explain_sql
  NewRelic::Agent::Database.explain_sql(params[:sql],
                                        params[:connection_config])
end

#find_segment(id) ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 169

def find_segment(id)
  return self if @segment_id == id
  called_segments.each do |segment|
    found = segment.find_segment(id)
    return found if found
  end
  nil
end

#obfuscated_sql ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 183

def obfuscated_sql
  NewRelic::Agent::Database.obfuscate_sql(params[:sql])
end

#params ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 138

def params
  @params ||= {}
end

#params=(p) ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 187

def params=(p)
  @params = p
end

#path_string ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 47

def path_string
  "#{metric_name}[#{called_segments.collect {|segment| segment.path_string }.join('')}]"
end

#to_array ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 36

def to_array
  [ (@entry_timestamp.to_f * 1000).round,
    (@exit_timestamp.to_f * 1000).round,
    @metric_name, (@params || {}) ] +
    [ (@called_segments ? @called_segments.map{|s| s.to_array} : []) ]
end

#to_debug_str(depth) ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 58

def to_debug_str(depth)
  tab = "  " * depth
  s = tab.clone
  s << ">> #{'%3i ms' % (@entry_timestamp*1000)} [#{self.class.name.split("::").last}] #{metric_name} \n"
  unless params.empty?
    params.each do |k,v|
      s << "#{tab}    -#{'%-16s' % k}: #{v.to_s[0..80]}\n"
    end
  end
  called_segments.each do |cs|
    s << cs.to_debug_str(depth + 1)
  end
  s << tab + "<< "
  s << case @exit_timestamp
       when nil then ' n/a'
       when Numeric then '%3i ms' % (@exit_timestamp*1000)
       else @exit_timestamp.to_s
       end
  s << " #{metric_name}\n"
end

#to_json ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 43

def to_json
  JSON.dump(self.to_array)
end

#to_s ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 32

def to_s
  to_debug_str(0)
end

#to_s_compact ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 50

def to_s_compact
  str = ""
  str << metric_name
  if called_segments.any?
    str << "{#{called_segments.map { | cs | cs.to_s_compact }.join(",")}}"
  end
  str
end

#truncate(max) ⇒ Object

Walk through the tree and truncate the segments in a depth-first manner



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# File 'lib/new_relic/transaction_sample/segment.rb', line 107

def truncate(max)
  return 1 unless @called_segments
  total, self.called_segments = truncate_each_child(max - 1)
  total+1
end

#truncate_each_child(max) ⇒ Object 



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# File 'lib/new_relic/transaction_sample/segment.rb', line 113

def truncate_each_child(max)
  total = 0
  accumulator = []
  called_segments.each { | s |
    if total == max
      true
    else
      total += s.truncate(max - total)
      accumulator << s
    end
  }
  total
  [total, accumulator]
end