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I want to execute code before cache is cleared, for example for the menu cache:

// Clear menu cache
$cache = \Drupal::cache('menu');
$cache->deleteAll();

I want to intervene when the cache clear is called, right before it is deleted. I've read the documentation on Drupal::cache and the Cache API but didn't find a solution. Do note that I want to do this using core code only, no contributed modules.

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  • I think you'll need to provide your own cache classes to do that; none of the core classes invoke events or hooks in ::deleteAll or ::deleteMultiple which is where it would need to happen
    – Clive ♦
    Jan 14, 2017 at 18:42
  • Exactly, thanks for your input. Could you provide a code sample to get me started?
    – Wim Mostrey
    Jan 14, 2017 at 20:31
  • Why do you need this? It is a cache, caches are not persistent. Whatever you try to do there will not be reliable, especially with alternative cache backends like redis/memcache which will just drop your cache entries if the memory is used up
    – Berdir
    Jan 15, 2017 at 11:20
  • It's for the following core isse: Standard profile: make "Home" menu link to <front> editable/deletable. We're removing a link from standard.links.menu.yml and adding it with MenuLinkContent::create() instead. And now we need an upgrade path.
    – Wim Mostrey
    Jan 15, 2017 at 11:22
  • Ah of course, just saw the update there. Yeah, forgot about the update path, alex pott saving us again :) I don't think that will work, adding a new hook won't exist yet in the cache either. So it won't be called..
    – Berdir
    Jan 15, 2017 at 11:27

1 Answer 1

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It isn't clean but I'm able to do this with hook_cache_flush. It's called when a cache clear has been called, before the cache has been cleared.

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