I have ha service with tag: event_subscribe (KernelEvents::REQUEST) with priority 30 and in the same module a service path_processor_inbound with priority 29

The problem is: in event_subscribe Service creo a Constant but the service path_processor_inbound is called before. I tried all the variants of priority, but it is not the problem.

  • in event_subscribe Service creo a Constant but the service path_processor_inbound is called before 29 comes before 30 so that's right isn't it?
    – Clive
    Feb 16, 2017 at 16:53
  • No, i want call first event_subscribe
    – BOES
    Feb 16, 2017 at 16:54
  • Please edit your question, it currently says the opposite
    – Clive
    Feb 16, 2017 at 16:58
  • ! U undestand priority ? "The priority value is optional and defaults to 0. The higher the priority, the sooner it gets executed."
    – BOES
    Feb 16, 2017 at 18:36
  • Oh I see, Symfony and Drupal have different definitions of "priority". In Drupal's API, a lower number means a higher priority; a numerical running order if you will. I'd post your code and describe the methods you're using to confirm the priority is being set properly etc
    – Clive
    Feb 16, 2017 at 18:59

1 Answer 1


Both priorities are for different queues. If you set a priority for an event subscriber this is only for the specific event you subscribe to. In this example you subscribe to KernelEvents::REQUEST. Then you can only move up and down in the list of all other subscribers to this event.

You can find more information and a list of the D8 events here:


Path inbound/outbound processors are not even events. These are handled by the PathProcessor Manager and the priority set here is again only for the list of all other path processors.

  • ! can retrive a list with queque priority ?
    – BOES
    Feb 17, 2017 at 8:29
  • I've checked, path processors are called dependent on the status of your cache and what module you've installed 5 or 10 times per request. So there is no single event you can target. But you can try to increase the priority for the KernelEvents:REQUEST subscriber until you have the result you want.
    – 4uk4
    Feb 17, 2017 at 8:42
  • There is a great debugging tool from Symfony, Web Profiler. In Drupal this is included in the Devel module.
    – 4uk4
    Feb 17, 2017 at 8:46
  • ! when path_processor don't have a queue specific ?
    – BOES
    Feb 17, 2017 at 9:21
  • ! 30000000 priority, same problem. It's not a prority problem
    – BOES
    Feb 17, 2017 at 9:23

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