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class ActiveSupport::Notifications::Event

Attributes

[R] end
[R] name
[RW] payload
[R] time
[R] transaction_id

Public class methods

new(name, start, ending, transaction_id, payload)

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Source code GitHub 
# File activesupport/lib/active_support/notifications/instrumenter.rb, line 110
def initialize(name, start, ending, transaction_id, payload)
  @name           = name
  @payload        = payload.dup
  @time           = start ? start.to_f * 1_000.0 : start
  @transaction_id = transaction_id
  @end            = ending ? ending.to_f * 1_000.0 : ending
  @cpu_time_start = 0.0
  @cpu_time_finish = 0.0
  @allocation_count_start = 0
  @allocation_count_finish = 0
end

Public instance methods

allocations()

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Returns the number of allocations made between the call to start! and the call to finish!.

Source code GitHub 
# File activesupport/lib/active_support/notifications/instrumenter.rb, line 164
def allocations
  @allocation_count_finish - @allocation_count_start
end

cpu_time()

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Returns the CPU time (in milliseconds) passed between the call to start! and the call to finish!.

Source code GitHub 
# File activesupport/lib/active_support/notifications/instrumenter.rb, line 151
def cpu_time
  @cpu_time_finish - @cpu_time_start
end

duration()

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Returns the difference in milliseconds between when the execution of the event started and when it ended.

ActiveSupport::Notifications.subscribe('wait') do |event|
  @event = event
end

ActiveSupport::Notifications.instrument('wait') do
  sleep 1
end

@event.duration # => 1000.138
Source code GitHub 
# File activesupport/lib/active_support/notifications/instrumenter.rb, line 197
def duration
  self.end - time
end

finish!()

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Record information at the time this event finishes

Source code GitHub 
# File activesupport/lib/active_support/notifications/instrumenter.rb, line 143
def finish!
  @cpu_time_finish = now_cpu
  @end = now
  @allocation_count_finish = now_allocations
end

idle_time()

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Returns the idle time time (in milliseconds) passed between the call to start! and the call to finish!.

Source code GitHub 
# File activesupport/lib/active_support/notifications/instrumenter.rb, line 157
def idle_time
  diff = duration - cpu_time
  diff > 0.0 ? diff : 0.0
end

record()

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Source code GitHub 
# File activesupport/lib/active_support/notifications/instrumenter.rb, line 122
def record
  start!
  begin
    yield payload if block_given?
  rescue Exception => e
    payload[:exception] = [e.class.name, e.message]
    payload[:exception_object] = e
    raise e
  ensure
    finish!
  end
end

start!()

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Record information at the time this event starts

Source code GitHub 
# File activesupport/lib/active_support/notifications/instrumenter.rb, line 136
def start!
  @time = now
  @cpu_time_start = now_cpu
  @allocation_count_start = now_allocations
end

Definition files