Struct SystemBuilder 

pub struct SystemBuilder { /* private fields */ }

Builder for declaring a system’s metadata and component access.

Implementations

impl SystemBuilder

pub fn new(name: &str) -> Self

Creates a new system builder with the given name.

pub fn phase(self, phase: Phase) -> Self

Sets which tick phase this system runs in.

pub fn every(self, every: u64) -> Self

Sets the frequency divisor.

The system runs when tick_count % every == 0. Default is 1 (every tick).

pub fn reads<T: Component>(self) -> Self

Declares that this system reads a component type.

pub fn writes<T: Component>(self) -> Self

Declares that this system writes a component type.

pub fn budget_ms(self, ms: u64) -> Self

Sets the CPU budget for this system in milliseconds.

When set, the system can check ctx.budget().is_expired() to yield early. Systems without a budget get an unlimited one.

pub fn run<F: FnMut(&mut dyn SystemContext) + Send + 'static>( self, runner: F, ) -> SystemDescriptor

Finalizes the builder and registers the system with a runner.