mirror of
https://github.com/bevyengine/bevy
synced 2024-11-10 07:04:33 +00:00
Rename system chaining to system piping (#6230)
# Objective > System chaining is a confusing name: it implies the ability to construct non-linear graphs, and suggests a sense of system ordering that is only incidentally true. Instead, it actually works by passing data from one system to the next, much like the pipe operator. > In the accepted [stageless RFC](https://github.com/bevyengine/rfcs/blob/main/rfcs/45-stageless.md), this concept is renamed to piping, and "system chaining" is used to construct groups of systems with ordering dependencies between them. Fixes #6225. ## Changelog System chaining has been renamed to system piping to improve clarity (and free up the name for new ordering APIs). ## Migration Guide The `.chain(handler_system)` method on systems is now `.pipe(handler_system)`. The `IntoChainSystem` trait is now `IntoPipeSystem`, and the `ChainSystem` struct is now `PipeSystem`.
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8 changed files with 62 additions and 60 deletions
10
Cargo.toml
10
Cargo.toml
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@ -872,12 +872,12 @@ category = "ECS (Entity Component System)"
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wasm = false
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[[example]]
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name = "system_chaining"
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path = "examples/ecs/system_chaining.rs"
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name = "system_piping"
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path = "examples/ecs/system_piping.rs"
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[package.metadata.example.system_chaining]
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name = "System Chaining"
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description = "Chain two systems together, specifying a return type in a system (such as `Result`)"
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[package.metadata.example.system_piping]
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name = "System Piping"
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description = "Pipe the output of one system into a second, allowing you to handle any errors gracefully"
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category = "ECS (Entity Component System)"
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wasm = false
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@ -38,7 +38,7 @@ pub mod prelude {
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Schedule, Stage, StageLabel, State, SystemLabel, SystemSet, SystemStage,
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},
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system::{
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adapter as system_adapter, Commands, In, IntoChainSystem, IntoSystem, Local, NonSend,
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adapter as system_adapter, Commands, In, IntoPipeSystem, IntoSystem, Local, NonSend,
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NonSendMut, ParallelCommands, ParamSet, Query, RemovedComponents, Res, ResMut,
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Resource, System, SystemParamFunction,
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},
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@ -3,7 +3,7 @@ use crate::{
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RunCriteriaDescriptor, RunCriteriaDescriptorCoercion, RunCriteriaLabel, ShouldRun,
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SystemSet,
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},
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system::{In, IntoChainSystem, Local, Res, ResMut, Resource},
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system::{In, IntoPipeSystem, Local, Res, ResMut, Resource},
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};
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use std::{
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any::TypeId,
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@ -79,7 +79,7 @@ where
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(move |state: Res<State<T>>| {
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state.stack.last().unwrap() == &pred && state.transition.is_none()
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})
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.chain(should_run_adapter::<T>)
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.pipe(should_run_adapter::<T>)
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.after(DriverLabel::of::<T>())
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}
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@ -95,7 +95,7 @@ where
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Some(_) => false,
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None => *is_inactive,
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})
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.chain(should_run_adapter::<T>)
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.pipe(should_run_adapter::<T>)
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.after(DriverLabel::of::<T>())
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}
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@ -118,7 +118,7 @@ where
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Some(_) => false,
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None => *is_in_stack,
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})
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.chain(should_run_adapter::<T>)
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.pipe(should_run_adapter::<T>)
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.after(DriverLabel::of::<T>())
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}
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@ -133,7 +133,7 @@ where
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_ => false,
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})
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})
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.chain(should_run_adapter::<T>)
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.pipe(should_run_adapter::<T>)
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.after(DriverLabel::of::<T>())
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}
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@ -148,7 +148,7 @@ where
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_ => false,
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})
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})
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.chain(should_run_adapter::<T>)
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.pipe(should_run_adapter::<T>)
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.after(DriverLabel::of::<T>())
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}
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@ -162,7 +162,7 @@ where
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_ => false,
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})
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})
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.chain(should_run_adapter::<T>)
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.pipe(should_run_adapter::<T>)
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.after(DriverLabel::of::<T>())
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}
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@ -176,7 +176,7 @@ where
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_ => false,
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})
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})
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.chain(should_run_adapter::<T>)
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.pipe(should_run_adapter::<T>)
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.after(DriverLabel::of::<T>())
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}
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@ -499,7 +499,7 @@ impl<T> Copy for SystemTypeIdLabel<T> {}
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///
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/// # Example
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///
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/// To create something like [`ChainSystem`], but in entirely safe code.
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/// To create something like [`PipeSystem`], but in entirely safe code.
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///
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/// ```rust
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/// use std::num::ParseIntError;
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@ -510,8 +510,8 @@ impl<T> Copy for SystemTypeIdLabel<T> {}
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/// // Unfortunately, we need all of these generics. `A` is the first system, with its
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/// // parameters and marker type required for coherence. `B` is the second system, and
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/// // the other generics are for the input/output types of `A` and `B`.
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/// /// Chain creates a new system which calls `a`, then calls `b` with the output of `a`
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/// pub fn chain<AIn, Shared, BOut, A, AParam, AMarker, B, BParam, BMarker>(
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/// /// Pipe creates a new system which calls `a`, then calls `b` with the output of `a`
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/// pub fn pipe<AIn, Shared, BOut, A, AParam, AMarker, B, BParam, BMarker>(
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/// mut a: A,
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/// mut b: B,
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/// ) -> impl FnMut(In<AIn>, ParamSet<(SystemParamItem<AParam>, SystemParamItem<BParam>)>) -> BOut
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@ -529,15 +529,15 @@ impl<T> Copy for SystemTypeIdLabel<T> {}
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/// }
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/// }
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///
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/// // Usage example for `chain`:
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/// // Usage example for `pipe`:
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/// fn main() {
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/// let mut world = World::default();
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/// world.insert_resource(Message("42".to_string()));
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///
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/// // chain the `parse_message_system`'s output into the `filter_system`s input
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/// let mut chained_system = IntoSystem::into_system(chain(parse_message, filter));
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/// chained_system.initialize(&mut world);
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/// assert_eq!(chained_system.run((), &mut world), Some(42));
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/// // pipe the `parse_message_system`'s output into the `filter_system`s input
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/// let mut piped_system = IntoSystem::into_system(pipe(parse_message, filter));
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/// piped_system.initialize(&mut world);
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/// assert_eq!(piped_system.run((), &mut world), Some(42));
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/// }
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///
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/// #[derive(Resource)]
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@ -551,7 +551,7 @@ impl<T> Copy for SystemTypeIdLabel<T> {}
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/// result.ok().filter(|&n| n < 100)
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/// }
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/// ```
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/// [`ChainSystem`]: crate::system::ChainSystem
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/// [`PipeSystem`]: crate::system::PipeSystem
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/// [`ParamSet`]: crate::system::ParamSet
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pub trait SystemParamFunction<In, Out, Param: SystemParam, Marker>: Send + Sync + 'static {
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fn run(&mut self, input: In, param_value: SystemParamItem<Param>) -> Out;
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@ -75,8 +75,8 @@ mod function_system;
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mod query;
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#[allow(clippy::module_inception)]
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mod system;
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mod system_chaining;
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mod system_param;
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mod system_piping;
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pub use commands::*;
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pub use exclusive_function_system::*;
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@ -84,8 +84,8 @@ pub use exclusive_system_param::*;
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pub use function_system::*;
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pub use query::*;
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pub use system::*;
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pub use system_chaining::*;
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pub use system_param::*;
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pub use system_piping::*;
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/// Ensure that a given function is a system
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///
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@ -7,10 +7,11 @@ use crate::{
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};
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use std::borrow::Cow;
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/// A [`System`] that chains two systems together, creating a new system that routes the output of
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/// the first system into the input of the second system, yielding the output of the second system.
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/// A [`System`] created by piping the output of the first system into the input of the second.
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///
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/// Given two systems `A` and `B`, A may be chained with `B` as `A.chain(B)` if the output type of `A` is
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/// This can be repeated indefinitely, but system pipes cannot branch: the output is consumed by the receiving system.
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///
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/// Given two systems `A` and `B`, A may be piped into `B` as `A.pipe(B)` if the output type of `A` is
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/// equal to the input type of `B`.
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///
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/// Note that for [`FunctionSystem`](crate::system::FunctionSystem)s the output is the return value
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/// let mut world = World::default();
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/// world.insert_resource(Message("42".to_string()));
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///
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/// // chain the `parse_message_system`'s output into the `filter_system`s input
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/// let mut chained_system = parse_message_system.chain(filter_system);
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/// chained_system.initialize(&mut world);
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/// assert_eq!(chained_system.run((), &mut world), Some(42));
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/// // pipe the `parse_message_system`'s output into the `filter_system`s input
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/// let mut piped_system = parse_message_system.pipe(filter_system);
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/// piped_system.initialize(&mut world);
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/// assert_eq!(piped_system.run((), &mut world), Some(42));
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/// }
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///
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/// #[derive(Resource)]
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/// result.ok().filter(|&n| n < 100)
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/// }
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/// ```
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pub struct ChainSystem<SystemA, SystemB> {
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pub struct PipeSystem<SystemA, SystemB> {
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system_a: SystemA,
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system_b: SystemB,
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name: Cow<'static, str>,
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archetype_component_access: Access<ArchetypeComponentId>,
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}
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impl<SystemA: System, SystemB: System<In = SystemA::Out>> System for ChainSystem<SystemA, SystemB> {
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impl<SystemA: System, SystemB: System<In = SystemA::Out>> System for PipeSystem<SystemA, SystemB> {
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type In = SystemA::In;
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type Out = SystemB::Out;
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}
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}
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/// An extension trait providing the [`IntoChainSystem::chain`] method for convenient [`System`]
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/// chaining.
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/// An extension trait providing the [`IntoPipeSystem::pipe`] method to pass input from one system into the next.
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///
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/// This trait is blanket implemented for all system pairs that fulfill the chaining requirement.
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/// The first system must have return type `T`
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/// and the second system must have [`In<T>`](crate::system::In) as its first system parameter.
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///
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/// See [`ChainSystem`].
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pub trait IntoChainSystem<ParamA, Payload, SystemB, ParamB, Out>:
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/// This trait is blanket implemented for all system pairs that fulfill the type requirements.
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///
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/// See [`PipeSystem`].
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pub trait IntoPipeSystem<ParamA, Payload, SystemB, ParamB, Out>:
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IntoSystem<(), Payload, ParamA> + Sized
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where
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SystemB: IntoSystem<Payload, Out, ParamB>,
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{
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/// Chain this system `A` with another system `B` creating a new system that feeds system A's
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/// output into system `B`, returning the output of system `B`.
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fn chain(self, system: SystemB) -> ChainSystem<Self::System, SystemB::System>;
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/// Pass the output of this system `A` into a second system `B`, creating a new compound system.
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fn pipe(self, system: SystemB) -> PipeSystem<Self::System, SystemB::System>;
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}
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impl<SystemA, ParamA, Payload, SystemB, ParamB, Out>
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IntoChainSystem<ParamA, Payload, SystemB, ParamB, Out> for SystemA
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IntoPipeSystem<ParamA, Payload, SystemB, ParamB, Out> for SystemA
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where
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SystemA: IntoSystem<(), Payload, ParamA>,
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SystemB: IntoSystem<Payload, Out, ParamB>,
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{
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fn chain(self, system: SystemB) -> ChainSystem<SystemA::System, SystemB::System> {
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fn pipe(self, system: SystemB) -> PipeSystem<SystemA::System, SystemB::System> {
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let system_a = IntoSystem::into_system(self);
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let system_b = IntoSystem::into_system(system);
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ChainSystem {
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name: Cow::Owned(format!("Chain({}, {})", system_a.name(), system_b.name())),
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PipeSystem {
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name: Cow::Owned(format!("Pipe({}, {})", system_a.name(), system_b.name())),
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system_a,
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system_b,
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archetype_component_access: Default::default(),
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}
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}
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/// A collection of common adapters for [chaining](super::ChainSystem) the result of a system.
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/// A collection of common adapters for [piping](super::PipeSystem) the result of a system.
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pub mod adapter {
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use crate::system::In;
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use std::fmt::Debug;
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/// use bevy_ecs::prelude::*;
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///
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/// return1
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/// .chain(system_adapter::new(u32::try_from))
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/// .chain(system_adapter::unwrap)
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/// .chain(print);
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/// .pipe(system_adapter::new(u32::try_from))
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/// .pipe(system_adapter::unwrap)
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/// .pipe(print);
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///
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/// fn return1() -> u64 { 1 }
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/// fn print(In(x): In<impl std::fmt::Debug>) {
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/// .add_system_to_stage(
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/// CoreStage::Update,
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/// // Panic if the load system returns an error.
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/// load_save_system.chain(system_adapter::unwrap)
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/// load_save_system.pipe(system_adapter::unwrap)
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/// )
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/// // ...
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/// # ;
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res.unwrap()
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}
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/// System adapter that ignores the output of the previous system in a chain.
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/// System adapter that ignores the output of the previous system in a pipe.
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/// This is useful for fallible systems that should simply return early in case of an `Err`/`None`.
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///
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/// # Examples
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/// .add_system_to_stage(
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/// CoreStage::Update,
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/// // If the system fails, just move on and try again next frame.
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/// fallible_system.chain(system_adapter::ignore)
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/// fallible_system.pipe(system_adapter::ignore)
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/// )
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/// // ...
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/// # ;
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unimplemented!()
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}
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assert_is_system(returning::<Result<u32, std::io::Error>>.chain(unwrap));
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assert_is_system(returning::<Option<()>>.chain(ignore));
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assert_is_system(returning::<&str>.chain(new(u64::from_str)).chain(unwrap));
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assert_is_system(returning::<Result<u32, std::io::Error>>.pipe(unwrap));
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assert_is_system(returning::<Option<()>>.pipe(ignore));
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assert_is_system(returning::<&str>.pipe(new(u64::from_str)).pipe(unwrap));
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}
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}
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@ -199,9 +199,9 @@ Example | Description
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[Removal Detection](../examples/ecs/removal_detection.rs) | Query for entities that had a specific component removed in a previous stage during the current frame
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[Startup System](../examples/ecs/startup_system.rs) | Demonstrates a startup system (one that runs once when the app starts up)
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[State](../examples/ecs/state.rs) | Illustrates how to use States to control transitioning from a Menu state to an InGame state
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[System Chaining](../examples/ecs/system_chaining.rs) | Chain two systems together, specifying a return type in a system (such as `Result`)
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[System Closure](../examples/ecs/system_closure.rs) | Show how to use closures as systems, and how to configure `Local` variables by capturing external state
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[System Parameter](../examples/ecs/system_param.rs) | Illustrates creating custom system parameters with `SystemParam`
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[System Piping](../examples/ecs/system_piping.rs) | Pipe the output of one system into a second, allowing you to handle any errors gracefully
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[System Sets](../examples/ecs/system_sets.rs) | Shows `SystemSet` use along with run criterion
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[Timers](../examples/ecs/timers.rs) | Illustrates ticking `Timer` resources inside systems and handling their state
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//! Illustrates how to make a single system from multiple functions running in sequence and sharing
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//! their inputs and outputs.
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//! Illustrates how to make a single system from multiple functions running in sequence,
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//! passing the output of the first into the input of the next.
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use anyhow::Result;
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use bevy::prelude::*;
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fn main() {
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App::new()
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.insert_resource(Message("42".to_string()))
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.add_system(parse_message_system.chain(handler_system))
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.add_system(parse_message_system.pipe(handler_system))
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.run();
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}
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