Crate bevy_async_ecs

🔄 Bevy Async ECS

What is Bevy Async ECS?

Bevy Async ECS is an asynchronous interface to the standard Bevy World. It aims to be simple and intuitive to use for those familiar with Bevy’s ECS.

AsyncWorld

AsyncWorld is the entrypoint for all further asynchronous manipulation of the world. It can only be created using the FromWorld trait implementation. It should be driven by an executor running parallel with the main Bevy app (this can either be one of the TaskPools or a blocking executor running on another thread).

Internally, the AsyncWorld simply wraps an MPSC channel sender. As such, it can be cheaply cloned and further sent to separate threads or tasks. This means that all operations on the AsyncWorld are processed in FIFO order. However, there are no ordering guarantees between AsyncWorlds or any derivatives sharing the same internal channel sender. If ordering guarantees are required, you can use the operations API described below (AsyncOperation::Queue).

It is important to note that Bevy is still running and mutating the world while the async tasks run! Assume that the world can be mutated

Basic example

use bevy::prelude::*;
use bevy::tasks::AsyncComputeTaskPool;
use bevy_async_ecs::*;

// vanilla Bevy system
fn print_names(query: Query<(Entity, &Name)>) {
	for (id, name) in query.iter() {
		info!("entity {:?} has name '{}'", id, name);
	}
}

fn main() {
	App::new()
		.add_plugins((DefaultPlugins, AsyncEcsPlugin))
		.add_systems(Startup, |world: &mut World| {
			let async_world = AsyncWorld::from_world(world);
			let fut = async move {
				let print_names = async_world.register_system(print_names).await;

				let entity = async_world.spawn_named("Frank").await;
				print_names.run().await;
				entity.despawn().await;
			};
			AsyncComputeTaskPool::get().spawn(fut).detach();
		})
		.run();
}

Multithreaded

bevy-async-ecs does not explicitly require the multi-threaded feature (though all the tests and examples do). However, when the task executor is running on a single thread (on wasm, for example), the async world will probably deadlock.

Structs

• AsyncComponent
  Represents a Component being retrieved.
• AsyncEcsPlugin
  Adds asynchronous ECS operations to Bevy Apps.
• AsyncEntity
  Represents an Entity that can be manipulated asynchronously.
• AsyncEvents
  Represents Bevy Events being received asynchronously
• AsyncIOSystem
  Represents a registered System that accepts input and returns output, and can be run asynchronously.
• AsyncResource
  Represents a Resource being retrieved.
• AsyncSystem
  Represents a registered System that can be run asynchronously.
• AsyncWorld
  Exposes asynchronous access to the Bevy ECS World.
• BoxedCommand
  The object-safe equivalent of a Box<dyn Command>.
• CommandQueueSender
  Use this to send commands (stored in CommandQueues) directly to the Bevy World, where they will be applied during the Last schedule.