Instrumenters are stored in a thread local.

Methods
F
I
N
S
Attributes
[R] id
Class Public methods
new(notifier)

Source: show | on GitHub 

# File activesupport/lib/active_support/notifications/instrumenter.rb, line 9
def initialize(notifier)
  @id       = unique_id
  @notifier = notifier
end
Instance Public methods
finish(name, payload)

Send a finish notification with name and payload.

Source: show | on GitHub 

# File activesupport/lib/active_support/notifications/instrumenter.rb, line 35
def finish(name, payload)
  @notifier.finish name, @id, payload
end
instrument(name, payload={})

Instrument the given block by measuring the time taken to execute it and publish it. Notice that events get sent even if an error occurs in the passed-in block.

Source: show | on GitHub 

# File activesupport/lib/active_support/notifications/instrumenter.rb, line 17
def instrument(name, payload={})
  start name, payload
  begin
    yield payload
  rescue Exception => e
    payload[:exception] = [e.class.name, e.message]
    raise e
  ensure
    finish name, payload
  end
end
start(name, payload)

Send a start notification with name and payload.

Source: show | on GitHub 

# File activesupport/lib/active_support/notifications/instrumenter.rb, line 30
def start(name, payload)
  @notifier.start name, @id, payload
end