Struct bevy_ecs::event::Events

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pub struct Events<E: Event> { /* private fields */ }
Expand description

An event collection that represents the events that occurred within the last two Events::update calls. Events can be written to using an EventWriter and are typically cheaply read using an EventReader.

Each event can be consumed by multiple systems, in parallel, with consumption tracked by the EventReader on a per-system basis.

If no ordering is applied between writing and reading systems, there is a risk of a race condition. This means that whether the events arrive before or after the next Events::update is unpredictable.

This collection is meant to be paired with a system that calls Events::update exactly once per update/frame.

event_update_system is a system that does this, typically initialized automatically using add_event. EventReaders are expected to read events from this collection at least once per loop/frame. Events will persist across a single frame boundary and so ordering of event producers and consumers is not critical (although poorly-planned ordering may cause accumulating lag). If events are not handled by the end of the frame after they are updated, they will be dropped silently.

§Example

use bevy_ecs::event::{Event, Events};

#[derive(Event)]
struct MyEvent {
    value: usize
}

// setup
let mut events = Events::<MyEvent>::default();
let mut reader = events.get_reader();

// run this once per update/frame
events.update();

// somewhere else: send an event
events.send(MyEvent { value: 1 });

// somewhere else: read the events
for event in reader.read(&events) {
    assert_eq!(event.value, 1)
}

// events are only processed once per reader
assert_eq!(reader.read(&events).count(), 0);

§Details

Events is implemented using a variation of a double buffer strategy. Each call to update swaps buffers and clears out the oldest one.

  • EventReaders will read events from both buffers.
  • EventReaders that read at least once per update will never drop events.
  • EventReaders that read once within two updates might still receive some events
  • EventReaders that read after two updates are guaranteed to drop all events that occurred before those updates.

The buffers in Events will grow indefinitely if update is never called.

An alternative call pattern would be to call update manually across frames to control when events are cleared. This complicates consumption and risks ever-expanding memory usage if not cleaned up, but can be done by adding your event as a resource instead of using add_event.

Example usage. Example usage standalone.

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impl<E: Event> Events<E>

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pub fn oldest_event_count(&self) -> usize

Returns the index of the oldest event stored in the event buffer.

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pub fn send(&mut self, event: E) -> EventId<E>

“Sends” an event by writing it to the current event buffer. EventReaders can then read the event. This method returns the ID of the sent event.

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pub fn send_batch( &mut self, events: impl IntoIterator<Item = E> ) -> SendBatchIds<E>

Sends a list of events all at once, which can later be read by EventReaders. This is more efficient than sending each event individually. This method returns the IDs of the sent events.

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pub fn send_default(&mut self) -> EventId<E>
where E: Default,

Sends the default value of the event. Useful when the event is an empty struct. This method returns the ID of the sent event.

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pub fn get_reader(&self) -> ManualEventReader<E>

Gets a new ManualEventReader. This will include all events already in the event buffers.

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pub fn get_reader_current(&self) -> ManualEventReader<E>

Gets a new ManualEventReader. This will ignore all events already in the event buffers. It will read all future events.

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pub fn update(&mut self)

Swaps the event buffers and clears the oldest event buffer. In general, this should be called once per frame/update.

If you need access to the events that were removed, consider using Events::update_drain.

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pub fn update_drain(&mut self) -> impl Iterator<Item = E> + '_

Swaps the event buffers and drains the oldest event buffer, returning an iterator of all events that were removed. In general, this should be called once per frame/update.

If you do not need to take ownership of the removed events, use Events::update instead.

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pub fn clear(&mut self)

Removes all events.

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pub fn len(&self) -> usize

Returns the number of events currently stored in the event buffer.

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pub fn is_empty(&self) -> bool

Returns true if there are no events currently stored in the event buffer.

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pub fn drain(&mut self) -> impl Iterator<Item = E> + '_

Creates a draining iterator that removes all events.

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pub fn iter_current_update_events(&self) -> impl ExactSizeIterator<Item = &E>

Iterates over events that happened since the last “update” call. WARNING: You probably don’t want to use this call. In most cases you should use an EventReader. You should only use this if you know you only need to consume events between the last update() call and your call to iter_current_update_events. If events happen outside that window, they will not be handled. For example, any events that happen after this call and before the next update() call will be dropped.

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pub fn get_event(&self, id: usize) -> Option<(&E, EventId<E>)>

Get a specific event by id if it still exists in the events buffer.

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pub fn oldest_id(&self) -> usize

Oldest id still in the events buffer.

Trait Implementations§

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impl<E: Debug + Event> Debug for Events<E>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<E: Event> Default for Events<E>

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<E: Event> Extend<E> for Events<E>

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fn extend<I>(&mut self, iter: I)
where I: IntoIterator<Item = E>,

Extends a collection with the contents of an iterator. Read more
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fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)
Extends a collection with exactly one element.
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fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)
Reserves capacity in a collection for the given number of additional elements. Read more
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impl<E> FromReflect for Events<E>
where Self: Any + Send + Sync, E: TypePath + Event, EventSequence<E>: FromReflect + TypePath + RegisterForReflection, usize: FromReflect + TypePath + RegisterForReflection,

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fn from_reflect(reflect: &dyn Reflect) -> Option<Self>

Constructs a concrete instance of Self from a reflected value.
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fn take_from_reflect( reflect: Box<dyn Reflect> ) -> Result<Self, Box<dyn Reflect>>

Attempts to downcast the given value to Self using, constructing the value using from_reflect if that fails. Read more
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impl<E> GetTypeRegistration for Events<E>
where Self: Any + Send + Sync, E: TypePath + Event, EventSequence<E>: FromReflect + TypePath + RegisterForReflection, usize: FromReflect + TypePath + RegisterForReflection,

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fn get_type_registration() -> TypeRegistration

Returns the default TypeRegistration for this type.
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fn register_type_dependencies(registry: &mut TypeRegistry)

Registers other types needed by this type. Read more
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impl<E> Reflect for Events<E>
where Self: Any + Send + Sync, E: TypePath + Event, EventSequence<E>: FromReflect + TypePath + RegisterForReflection, usize: FromReflect + TypePath + RegisterForReflection,

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fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

Returns the TypeInfo of the type represented by this value. Read more
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fn into_any(self: Box<Self>) -> Box<dyn Any>

Returns the value as a Box<dyn Any>.
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fn as_any(&self) -> &dyn Any

Returns the value as a &dyn Any.
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fn as_any_mut(&mut self) -> &mut dyn Any

Returns the value as a &mut dyn Any.
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fn into_reflect(self: Box<Self>) -> Box<dyn Reflect>

Casts this type to a boxed reflected value.
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fn as_reflect(&self) -> &dyn Reflect

Casts this type to a reflected value.
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fn as_reflect_mut(&mut self) -> &mut dyn Reflect

Casts this type to a mutable reflected value.
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fn clone_value(&self) -> Box<dyn Reflect>

Clones the value as a Reflect trait object. Read more
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fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>>

Performs a type-checked assignment of a reflected value to this value. Read more
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fn try_apply(&mut self, value: &dyn Reflect) -> Result<(), ApplyError>

Tries to apply a reflected value to this value. Read more
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fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type. Read more
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fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type. Read more
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fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type. Read more
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fn reflect_owned(self: Box<Self>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type. Read more
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fn reflect_partial_eq(&self, value: &dyn Reflect) -> Option<bool>

Returns a “partial equality” comparison result. Read more
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fn apply(&mut self, value: &(dyn Reflect + 'static))

Applies a reflected value to this value. Read more
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fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type). Read more
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fn debug(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Debug formatter for the value. Read more
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fn serializable(&self) -> Option<Serializable<'_>>

Returns a serializable version of the value. Read more
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fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type. Read more
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impl<E> Struct for Events<E>
where Self: Any + Send + Sync, E: TypePath + Event, EventSequence<E>: FromReflect + TypePath + RegisterForReflection, usize: FromReflect + TypePath + RegisterForReflection,

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fn field(&self, name: &str) -> Option<&dyn Reflect>

Returns a reference to the value of the field named name as a &dyn Reflect.
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fn field_mut(&mut self, name: &str) -> Option<&mut dyn Reflect>

Returns a mutable reference to the value of the field named name as a &mut dyn Reflect.
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fn field_at(&self, index: usize) -> Option<&dyn Reflect>

Returns a reference to the value of the field with index index as a &dyn Reflect.
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fn field_at_mut(&mut self, index: usize) -> Option<&mut dyn Reflect>

Returns a mutable reference to the value of the field with index index as a &mut dyn Reflect.
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fn name_at(&self, index: usize) -> Option<&str>

Returns the name of the field with index index.
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fn field_len(&self) -> usize

Returns the number of fields in the struct.
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fn iter_fields(&self) -> FieldIter<'_>

Returns an iterator over the values of the reflectable fields for this struct.
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fn clone_dynamic(&self) -> DynamicStruct

Clones the struct into a DynamicStruct.
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impl<E> TypePath for Events<E>
where Self: Any + Send + Sync, E: TypePath + Event,

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fn type_path() -> &'static str

Returns the fully qualified path of the underlying type. Read more
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fn short_type_path() -> &'static str

Returns a short, pretty-print enabled path to the type. Read more
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fn type_ident() -> Option<&'static str>

Returns the name of the type, or None if it is anonymous. Read more
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fn crate_name() -> Option<&'static str>

Returns the name of the crate the type is in, or None if it is anonymous. Read more
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fn module_path() -> Option<&'static str>

Returns the path to the module the type is in, or None if it is anonymous. Read more
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impl<E> Typed for Events<E>
where Self: Any + Send + Sync, E: TypePath + Event, EventSequence<E>: FromReflect + TypePath + RegisterForReflection, usize: FromReflect + TypePath + RegisterForReflection,

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fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.
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impl<E: Event> Resource for Events<E>
where Self: Send + Sync + 'static,

Auto Trait Implementations§

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impl<E> Freeze for Events<E>

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impl<E> RefUnwindSafe for Events<E>
where E: RefUnwindSafe,

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impl<E> Send for Events<E>

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impl<E> Sync for Events<E>

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impl<E> Unpin for Events<E>
where E: Unpin,

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impl<E> UnwindSafe for Events<E>
where E: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Sync + Send>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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impl<T> DynamicTypePath for T
where T: TypePath,

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> FromWorld for T
where T: Default,

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fn from_world(_world: &mut World) -> T

Creates Self using data from the given World.
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impl<S> GetField for S
where S: Struct,

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fn get_field<T>(&self, name: &str) -> Option<&T>
where T: Reflect,

Returns a reference to the value of the field named name, downcast to T.
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fn get_field_mut<T>(&mut self, name: &str) -> Option<&mut T>
where T: Reflect,

Returns a mutable reference to the value of the field named name, downcast to T.
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impl<T> GetPath for T
where T: Reflect + ?Sized,

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fn reflect_path<'p>( &self, path: impl ReflectPath<'p> ) -> Result<&(dyn Reflect + 'static), ReflectPathError<'p>>

Returns a reference to the value specified by path. Read more
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fn reflect_path_mut<'p>( &mut self, path: impl ReflectPath<'p> ) -> Result<&mut (dyn Reflect + 'static), ReflectPathError<'p>>

Returns a mutable reference to the value specified by path. Read more
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fn path<'p, T>( &self, path: impl ReflectPath<'p> ) -> Result<&T, ReflectPathError<'p>>
where T: Reflect,

Returns a statically typed reference to the value specified by path. Read more
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fn path_mut<'p, T>( &mut self, path: impl ReflectPath<'p> ) -> Result<&mut T, ReflectPathError<'p>>
where T: Reflect,

Returns a statically typed mutable reference to the value specified by path. Read more
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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> ConditionalSend for T
where T: Send,