Module: Mmtrix::Agent::Instrumentation::ControllerInstrumentation::ClassMethods

Included in:
Mmtrix::Agent::Instrumentation::ControllerInstrumentation
Defined in:
lib/mmtrix/agent/instrumentation/controller_instrumentation.rb

Instance Method Summary collapse

Instance Method Details

#add_transaction_tracer(method, options = {}) ⇒ Object

Add transaction tracing to the given method. This will treat the given method as a main entrypoint for instrumentation, just like controller actions are treated by default. Useful especially for background tasks.

Example for background job:

class Job
  include Mmtrix::Agent::Instrumentation::ControllerInstrumentation
  def run(task)
     ...
  end
  # Instrument run so tasks show up under task.name.  Note single
  # quoting to defer eval to runtime.
  add_transaction_tracer :run, :name => '#{args[0].name}'
end

Here’s an example of a controller that uses a dispatcher action to invoke operations which you want treated as top level actions, so they aren’t all lumped into the invoker action.

MyController < ActionController::Base
  include Mmtrix::Agent::Instrumentation::ControllerInstrumentation
  # dispatch the given op to the method given by the service parameter.
  def invoke_operation
    op = params['operation']
    send op
  end
  # Ignore the invoker to avoid double counting
  mmtrix_ignore :only => 'invoke_operation'
  # Instrument the operations:
  add_transaction_tracer :print
  add_transaction_tracer :show
  add_transaction_tracer :forward
end

Here’s an example of how to pass contextual information into the transaction so it will appear in transaction traces:

class Job
  include Mmtrix::Agent::Instrumentation::ControllerInstrumentation
  def process(account)
     ...
  end
  # Include the account name in the transaction details.  Note the single
  # quotes to defer eval until call time.
  add_transaction_tracer :process, :params => '{ :account_name => args[0].name }'
end

See Mmtrix::Agent::Instrumentation::ControllerInstrumentation#perform_action_with_mmtrix_trace for the full list of available options.



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# File 'lib/mmtrix/agent/instrumentation/controller_instrumentation.rb', line 159

def add_transaction_tracer(method, options={})
  # The metric path:
  options[:name] ||= method.to_s

  argument_list = generate_argument_list(options)
  traced_method, punctuation = parse_punctuation(method)
  with_method_name, without_method_name = build_method_names(traced_method, punctuation)

  if already_added_transaction_tracer?(self, with_method_name)
    ::Mmtrix::Agent.logger.warn("Transaction tracer already in place for class = #{self.name}, method = #{method.to_s}, skipping")
    return
  end

  class_eval <<-EOC
    def #{with_method_name}(*args, &block)
      perform_action_with_mmtrix_trace(#{argument_list.join(',')}) do
        #{without_method_name}(*args, &block)
       end
    end
  EOC

  visibility = Mmtrix::Helper.instance_method_visibility self, method

  alias_method without_method_name, method.to_s
  alias_method method.to_s, with_method_name
  send visibility, method
  send visibility, with_method_name
  ::Mmtrix::Agent.logger.debug("Traced transaction: class = #{self.name}, method = #{method.to_s}, options = #{options.inspect}")
end

#mmtrix_ignore(specifiers = {}) ⇒ Object

Have Mmtrix ignore actions in this controller. Specify the actions as hash options using :except and :only. If no actions are specified, all actions are ignored.



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# File 'lib/mmtrix/agent/instrumentation/controller_instrumentation.rb', line 58

def mmtrix_ignore(specifiers={})
  mmtrix_ignore_aspect(NR_DO_NOT_TRACE_KEY, specifiers)
end

#mmtrix_ignore_apdex(specifiers = {}) ⇒ Object

Have Mmtrix omit apdex measurements on the given actions. Typically used for actions that are not user facing or that skew your overall apdex measurement. Accepts :except and :only options, as with #mmtrix_ignore.



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# File 'lib/mmtrix/agent/instrumentation/controller_instrumentation.rb', line 67

def mmtrix_ignore_apdex(specifiers={})
  mmtrix_ignore_aspect(NR_IGNORE_APDEX_KEY, specifiers)
end

#mmtrix_ignore_enduser(specifiers = {}) ⇒ Object 



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# File 'lib/mmtrix/agent/instrumentation/controller_instrumentation.rb', line 72

def mmtrix_ignore_enduser(specifiers={})
  mmtrix_ignore_aspect(NR_IGNORE_ENDUSER_KEY, specifiers)
end