Problem/Motivation

  • BlockViewBuilder::viewMultiple() (BVB) generates a render array for a block that gets some information from the block configuration entity, some from the block plugin, and some from the internal logic of BVB.
  • BVB invokes an alter hook to then allow modules to alter that result.
  • After #2459819: Remove CacheableInterface (and no longer let block plugins implement it), we have a use case for block plugins themselves wanting to alter the BVB generated array. For example, the SystemPoweredByBlock is cheaper to render than the cost of a cache_get(), so it may want to unset #cache['keys'] in order to optimize away the caching of itself on its own. Note that it does not and should not do this by implementing getCacheMaxAge() of 0, because the contents are cacheable, and it's necessary for higher-level caches, such as the page cache to know that. So unsetting the cache keys isn't about informing the system that the contents are uncacheable, but about optimizing away a decision to cache it at that particular level.
  • There might be other use cases for a block plugin to alter the BVB array? Perhaps changing #theme?
  • The above use cases can be implemented via the alter hook, but that then places the implementation in a separate place (e.g., in a .module file) from the plugin.

Proposed resolution

?

Remaining tasks

Discuss.

User interface changes

API changes

Comments

effulgentsia’s picture

effulgentsia commented

I opened this issue per #2459819-26: Remove CacheableInterface (and no longer let block plugins implement it), but so far I'm -1 on it. Or rather, my current opinion on the "decide if" is "no".

I think it violates separation of concerns for the plugin to alter what BVB generates, since per the issue summary, multiple actors participate in that generation. I think even using such an alter method to unset #cache['keys'] would be a violation of that, since the plugin doesn't know the cache strategy employed by the callers. For example, what if all cacheable blocks were retrieved with a cache_get_multiple()?

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smustgrave’s picture

smustgrave commented
Status: Active » Postponed (maintainer needs more info)
Issue tags: +stale-issue-cleanup

Thank you for creating this issue to improve Drupal.

We are working to decide if this task is still relevant to a currently supported version of Drupal. There hasn't been any discussion here for over 8 years which suggests that this has either been implemented or is no longer relevant. Your thoughts on this will allow a decision to be made.

Since we need more information to move forward with this issue, the status is now Postponed (maintainer needs more info). If we don't receive additional information to help with the issue, it may be closed after three months.

Thanks!

smustgrave’s picture

smustgrave commented
Status: Postponed (maintainer needs more info) » Closed (outdated)

Since @effulgentsia who opened this was a -1 and there's been no follow up going to close this one out.
If still valid please re-open Thanks!

Now that this issue is closed, please review the contribution record.

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