Problem/Motivation

It was decided that Drupal 8 will rely heavily on OOP. While the entity system does this, the only way to interact with is via procedural code. This patch intends to remove the necessity to write procedural code and opens up the possibility to make (much more) of the entity code unit testable. Other problems include a total mixup of storage independent logic with the actual storage, for example calculating the comment thread vs storing the comment thread. There are no interfaces for the storage controllers because it is entirely unclear what the specific storage needs are. The number of hooks available were totally unwieldy as well (quick, does hook_field_load fire before or after hook_field_attach_load? What about hook_field_insert and hook_field_attach_insert? Where does hook_entity_load enter into the picture?).

Proposed resolution

Hooks are out. Events are in. Storage controllers thin down and get an interface. The logic moves into a StorageSubscriber. Entity hook implementations move into an EntitySubscriber.

Remaining tasks

The patch is not yet green. It is being worked on in http://drupal.org/sandbox/chx/1857558 entitystorage branch.

User interface changes

No user interface changes.

API changes

All entity hooks die -- from hook_entity_load to hook_user_delete, all. Field attach storage hooks die. Field storage callbacks die. Entity events are born.

#1497374: Switch from Field-based storage to Entity-based storage
#1893772: Move entity-type specific storage logic into entity classes

Comments

chx’s picture

Title: Rewrite the entity system to be evented » Refactor the entity system to be evented

Fixing title per msonnabaum's advice. Indeed most of the patch is moving code around and not writing something entirely new (although the interfaces are new) and so are the triggers (was hooks, now events).

andypost’s picture

Title: Refactor the entity system to be evented » Rewrite the entity system to be evented

Is there ability to split patch on parts? to make review easy

andypost’s picture

Title: Rewrite the entity system to be evented » Refactor the entity system to be evented
xjm’s picture

chx’s picture

Remoing the increases learning curve tag. To the contrary. That's the point. Events are already used by the system. Most importantly, they are not a Drupalism.

Crell’s picture

chx: If I'm understanding correctly, then, module_invoke_all('entity_load', $node) gets replaced by:

$this->dispatcher->dispatch(EntityEvents::LOAD, new EntityEvent($entity));

Which means injecting the dispatcher into controller/handler for entities. Am I following correctly?

If so, it sounds like it's definitely a step up, so I'd +1 that. As far as revising what events we fire, I don't know the current smörgåsbord well enough to say which are redundant... which I suppose is argument enough that we should clean those up. :-)

xjm’s picture

No, this definitely applies. The tag name is for the OP of the issue, not the patch. It's not my fault the tag has such a name. ;)

chx’s picture

Assigned: chx » Unassigned
bojanz’s picture

Opened a less intrusive task: #2551893: Add events for matching entity hooks. Might even be 8.0 material, but I'm not pushing it.

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