Flagging for filtering: Better to add/remove empty component or poll over component data int.

System groups/styles

Poll: Set a CD raised value to flag as event raised. Unset when processing.
While processing modifies CD in-place, Burst compiled.

EvQueue: Uses a Queue to store and then apply events to objects using ComponentDataFromEntity.
No extra components or entities.
Multiple events per entity.


Batch: Creates one entity per event to keep the ECS flow.
Queues events and turns them into "entities with just the one event CD" via
These event-entities last 1 frame.
Multiple events per entity.

Dispatch: Uses a HashMultiMap to map event type to a queue, then applying using ComponentDataFromEntity.
Jobs by event-type could be sequenced or in parallel.
No extra components or entities.
Multiple events per entity.

Steps

_Raise: Raise events. Uses Config.instance.eventChance and a random number generator to

_CreateEvents: (Only for EntEv/Batch SG) All queued events are asigned to newly created entities. These entities last 1 frame.

_Process: Do processing of the events, modify the object.


Profiler screenshot

A screenshot (was going to try all systems with 10M entities each but the allocator exploded crashing Unity )



Here you can see how Dispatch at 10% event volume works ok like a queue (but prefilters by type) and queueing/batching runs as polling for 1%.