Class: AppMap::Trace::MethodEvent

Inherits:
MethodEventStruct show all
Defined in:
lib/appmap/trace/tracer.rb

Constant Summary collapse

LIMIT = 
100
COUNTER_LOCK =

:nodoc:

Mutex.new
@@id_counter = 
0

Instance Attribute Summary

Attributes inherited from MethodEventStruct

#defined_class, #event, #id, #lineno, #method_id, #path, #static, #thread_id

Class Method Summary collapse

Class Method Details

.build_from_tracepoint(me, tp, path) ⇒ Object

Build a new instance from a TracePoint.



51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
 
# File 'lib/appmap/trace/tracer.rb', line 51

def build_from_tracepoint(me, tp, path)
  me.id = next_id
  me.event = tp.event

  if tp.defined_class.singleton_class?
    me.defined_class = (tp.self.is_a?(Class) || tp.self.is_a?(Module)) ? tp.self.name : tp.self.class.name
  else
    me.defined_class = tp.defined_class.name
  end

  me.method_id = tp.method_id
  me.path = path
  me.lineno = tp.lineno
  me.static = tp.defined_class.name.nil?
  me.thread_id = Thread.current.object_id
end

.display_string(value) ⇒ Object

Gets a display string for a value. This is not meant to be a machine deserializable value.



87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
 
# File 'lib/appmap/trace/tracer.rb', line 87

def display_string(value)
  return nil unless value

  last_resort_string = lambda do
    warn "AppMap encountered an error inspecting a #{value.class.name}: #{$!.message}"
    '*Error inspecting variable*'
  end

  value_string = \
    begin
      value.to_s
    rescue NoMethodError
      begin
        value.inspect
      rescue StandardError
        last_resort_string.call
      end
    rescue StandardError
      last_resort_string.call
    end

  value_string[0...LIMIT].encode('utf-8', invalid: :replace, undef: :replace, replace: '_')
end

.next_id ⇒ Object

Gets the next serial id.

This method is thread-safe.



72
73
74
75
76
 
# File 'lib/appmap/trace/tracer.rb', line 72

def next_id
  COUNTER_LOCK.synchronize do
    @@id_counter += 1
  end
end

.value_in_binding(tp, key, &block) ⇒ Object

Gets a value, by key, from the trace point binding. If the method raises an error, it can be handled by the optional block.



80
81
82
83
84
 
# File 'lib/appmap/trace/tracer.rb', line 80

def value_in_binding(tp, key, &block)
  tp.binding.eval(key.to_s)
rescue NameError, ArgumentError
  yield if block_given?
end