new

TracePoint.new(*events) { |obj| block } â obj

Class Public methods

Returns a new TracePoint object, not enabled by default.

Next, in order to activate the trace, you must use #enable

trace = TracePoint.new(:call) do |tp|
    p [tp.lineno, tp.defined_class, tp.method_id, tp.event]
end
#=> #<TracePoint:0x007f17372cdb20>

trace.enable
#=> #<TracePoint:0x007f17372cdb20>

puts "Hello, TracePoint!"
# ...
# [48, IRB::Notifier::AbstractNotifier, :printf, :call]
# ...

When you want to deactivate the trace, you must use #disable

trace.disable

See Events at TracePoint for possible events and more information.

A block must be given, otherwise a ThreadError is raised.

If the trace method isn't included in the given events filter, a RuntimeError is raised.

TracePoint.trace(:line) do |tp|
    p tp.raised_exception
end
#=> RuntimeError: 'raised_exception' not supported by this event

If the trace method is called outside block, a RuntimeError is raised.

TracePoint.trace(:line) do |tp|
  $tp = tp
end
$tp.line #=> access from outside (RuntimeError)

Access from other threads is also forbidden.

doc_ruby_on_rails

2015-06-09 17:14:17

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