Module: Datadog::Contrib::Rails::ActiveSupport

Defined in:
lib/ddtrace/contrib/rails/active_support.rb

Overview

Code used to create and handle ‘rails.cache’ spans.

Class Method Summary collapse

Class Method Details

.instrument ⇒ Object 



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# File 'lib/ddtrace/contrib/rails/active_support.rb', line 9

def self.instrument
  # patch Rails core components
  Datadog::RailsCachePatcher.patch_cache_store()

  # subscribe when a cache read starts being processed
  ::ActiveSupport::Notifications.subscribe('start_cache_read.active_support') do |*args|
    start_trace_cache('GET', *args)
  end

  # subscribe when a cache fetch starts being processed
  ::ActiveSupport::Notifications.subscribe('start_cache_fetch.active_support') do |*args|
    start_trace_cache('GET', *args)
  end

  # subscribe when a cache write starts being processed
  ::ActiveSupport::Notifications.subscribe('start_cache_write.active_support') do |*args|
    start_trace_cache('SET', *args)
  end

  # subscribe when a cache delete starts being processed
  ::ActiveSupport::Notifications.subscribe('start_cache_delete.active_support') do |*args|
    start_trace_cache('DELETE', *args)
  end

  # subscribe when a cache read has been processed
  ::ActiveSupport::Notifications.subscribe('cache_read.active_support') do |*args|
    trace_cache('GET', *args)
  end

  # subscribe when a cache write has been processed
  ::ActiveSupport::Notifications.subscribe('cache_write.active_support') do |*args|
    trace_cache('SET', *args)
  end

  # subscribe when a cache delete has been processed
  ::ActiveSupport::Notifications.subscribe('cache_delete.active_support') do |*args|
    trace_cache('DELETE', *args)
  end
end