Proper way to utilize ExclusiveEntityTransaction?

Soaryn · March 31, 2019, 7:08pm

So far, I understand I need to create a new world for setting up new entities; however, what I am not 100% on is how to implement the job call on the main thread to initialize the setup. For instance, what exactly is the design use for ExclusiveEntityTransactionDependency? Is it for initial dependency setup or is it for you to call complete on after ending?

NoDumbQuestion · April 1, 2019, 3:27am

I am not see doc on ExclusiveEntity in new document. But you can see it from old version

github.com

Unity-Technologies/EntityComponentSystemSamples/blob/875189c4722bd61ff7bea270ef051b4ea4e798ee/Documentation~/exclusive_entity_transaction.md

# ExclusiveEntityTransaction

`ExclusiveEntityTransaction` is an API to create & destroy entities from a job. The purpose is to enable procedural generation scenarios where instantiation on big scale must happen on jobs. As the name implies it is exclusive to any other access to the [EntityManager](entity_manager.md).

`ExclusiveEntityTransaction` should be used on a manually created [World](world.md) that acts as a staging area to construct & setup entities.

After the job has completed you can end the `ExclusiveEntityTransaction` and use ```EntityManager.MoveEntitiesFrom(EntityManager srcEntities);``` to move the entities to an active `World`.

[Back to Unity Data-Oriented reference](reference.md)

And sample inside AsyncLoadSceneOperation in package Unity.Scenes

What happen here is you can get EntityManager.ExclusiveEntityTransaction and pass it to Job (it act as entitymanager but inside job)