Enum Stage 

pub enum Stage {
    Filter(Box<dyn Plugin>),
    External(ExternalStage),
}

What a factory produced.

Most stages are Plugins the host calls per chunk. A few cannot be: a subprocess decides nothing synchronously, may emit nothing for the chunk it was given, and may emit bytes belonging to three chunks ago. Rather than bend Plugin into something a subprocess could satisfy (and lose the property that makes it portable to WASM) such a stage is described here and run by the host.

A WASM guest can only ever produce Stage::Filter; spawning is a host capability by construction.

Variants

Filter(Box<dyn Plugin>)

External(ExternalStage)

Implementations

impl Stage

pub fn filter(plugin: impl Plugin + 'static) -> Self

Build a filter stage from a plugin

Trait Implementations

impl From<Box<dyn Plugin>> for Stage

fn from(plugin: Box<dyn Plugin>) -> Self

Converts to this type from the input type.