Class: Yuslow::Investigation

Inherits:
Object
  • Object
show all
Defined in:
lib/yuslow/investigation.rb

Instance Method Summary collapse

Constructor Details

#initialize(debug: false, printer: nil, max_depth:) ⇒ Investigation

Returns a new instance of Investigation.



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# File 'lib/yuslow/investigation.rb', line 3

def initialize(debug: false, printer: nil, max_depth:)
  if max_depth
    raise ArgumentError, 'max_depth must be a number'      if !max_depth.is_a? Numeric
    raise ArgumentError, 'max_depth cannot be less than 1' if max_depth < 1
  end

  @printer = printer
  @debug = debug
  @tracing = false
  @trace = nil
  @max_depth = max_depth
  @execution = {}
end

Instance Method Details

#debug(trace_point, indent) ⇒ Object 



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# File 'lib/yuslow/investigation.rb', line 69

def debug(trace_point, indent)
  return unless @debug

  puts (' ' * indent) + "#{trace_point.event} #{trace_point.defined_class}##{trace_point.callee_id}"
end

#finish ⇒ Object 



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# File 'lib/yuslow/investigation.rb', line 63

def finish
  @trace.disable

  print_result @printer if @printer
end

#print_result(printer) ⇒ Object 



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# File 'lib/yuslow/investigation.rb', line 75

def print_result(printer)
  return unless printer

  operations =
    @execution.keys.map do |thread_id|
      @execution[thread_id][:root]
    end.compact

  printer.execute operations
end

#start ⇒ Object 



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# File 'lib/yuslow/investigation.rb', line 17

def start
  @trace = TracePoint.new(:call, :return, :c_call, :c_return) do |trace_point|
    thread_id = Thread.current.object_id
    @execution[thread_id] ||= {root: nil, current: nil, depth: 0}

    if trace_point.defined_class == self.class
      if trace_point.callee_id == :start
        @tracing = true
      elsif trace_point.callee_id == :finish
        @tracing = false
      else
        raise "Unexpected method #{trace_point.callee_id} called on #{self.class}"
      end
    elsif @tracing
      if %i(call c_call).include?(trace_point.event)
        if !@max_depth || @execution[thread_id][:depth] < @max_depth
          if @execution[thread_id][:current]
            @execution[thread_id][:current] = @execution[thread_id][:current].fork object: trace_point.defined_class,
                                                                                   method: trace_point.callee_id
          else
            operation = Operation.new object: trace_point.defined_class, method: trace_point.callee_id
            @execution[thread_id][:root]    = operation
            @execution[thread_id][:current] = operation
          end

          debug trace_point, @execution[thread_id][:depth]
          @execution[thread_id][:depth] += 1
        end
      elsif %i(return c_return).include? trace_point.event
        if @execution[thread_id][:current]&.identifier == "#{trace_point.defined_class}##{trace_point.callee_id}"
          @execution[thread_id][:depth] -= 1

          if !@max_depth || @execution[thread_id][:depth] < @max_depth
            debug trace_point, @execution[thread_id][:depth]

            @execution[thread_id][:current]&.complete
            @execution[thread_id][:current] = @execution[thread_id][:current]&.parent
          end
        end
      end
    end
  end

  @trace.enable
end