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require 'securerandom'
module ActiveSupport
module Notifications
# Instrumenters are stored in a thread local.
class Instrumenter
attr_reader :id
def initialize(notifier)
@id = unique_id
@notifier = notifier
end
# 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.
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
# Send a start notification with +name+ and +payload+.
def start(name, payload)
@notifier.start name, @id, payload
end
# Send a finish notification with +name+ and +payload+.
def finish(name, payload)
@notifier.finish name, @id, payload
end
private
def unique_id
SecureRandom.hex(10)
end
end
class Event
attr_reader :name, :time, :transaction_id, :payload, :children
attr_accessor :end
def initialize(name, start, ending, transaction_id, payload)
@name = name
@payload = payload.dup
@time = start
@transaction_id = transaction_id
@end = ending
@children = []
@duration = nil
end
# Returns the difference in milliseconds between when the execution of the
# event started and when it ended.
#
# ActiveSupport::Notifications.subscribe('wait') do |*args|
# @event = ActiveSupport::Notifications::Event.new(*args)
# end
#
# ActiveSupport::Notifications.instrument('wait') do
# sleep 1
# end
#
# @event.duration # => 1000.138
def duration
@duration ||= 1000.0 * (self.end - time)
end
def <<(event)
@children << event
end
def parent_of?(event)
@children.include? event
end
end
end
end
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