Struct AsyncCallback 

#[non_exhaustive]
pub struct AsyncCallback<Request, Streams: StreamPack = ()> {
    pub request: Request,
    pub streams: Streams::StreamChannels,
    pub channel: Channel,
    pub source: Entity,
    pub session: Entity,
}

Use AsyncCallback to indicate that your system or function is meant to define an async Callback. An async callback is not associated with any entity, and it must return a Future<Output=Response> that will be polled by the async task pool.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

request: Request

The input data of the request

streams: Streams::StreamChannels

Stream channels that will let you send stream information. This will usually be a StreamChannel or a (possibly nested) tuple of StreamChannels, whichever matches the StreamPack description.

channel: Channel

The channel that allows querying and syncing with the world while the callback executes asynchronously.

source: Entity

The node in a workflow or series that asked for the callback

session: Entity

The unique session ID for the workflow