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https://github.com/bevyengine/bevy
synced 2024-11-10 07:04:33 +00:00
drop pending asset loads (#14808)
# Objective when handles for loading assets are dropped, we currently wait until load is completed before dropping the handle. drop asset-load tasks immediately ## Solution - track tasks for loading assets and drop them immediately when all handles are dropped. ~~- use `join_all` in `gltf_loader.rs` to allow it to yield and be dropped.~~ doesn't cover all the load apis - for those it doesn't cover the task will still be detached and will still complete before the result is discarded. separated out from #13170
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6ddbf9771a
commit
f06cd448db
2 changed files with 103 additions and 73 deletions
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@ -5,6 +5,7 @@ use crate::{
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UntypedAssetId, UntypedHandle,
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};
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use bevy_ecs::world::World;
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use bevy_tasks::Task;
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use bevy_utils::tracing::warn;
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use bevy_utils::{Entry, HashMap, HashSet, TypeIdMap};
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use crossbeam_channel::Sender;
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@ -76,6 +77,7 @@ pub(crate) struct AssetInfos {
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pub(crate) dependency_loaded_event_sender: TypeIdMap<fn(&mut World, UntypedAssetId)>,
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pub(crate) dependency_failed_event_sender:
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TypeIdMap<fn(&mut World, UntypedAssetId, AssetPath<'static>, AssetLoadError)>,
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pub(crate) pending_tasks: HashMap<UntypedAssetId, Task<()>>,
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}
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impl std::fmt::Debug for AssetInfos {
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@ -364,6 +366,7 @@ impl AssetInfos {
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&mut self.path_to_id,
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&mut self.loader_dependants,
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&mut self.living_labeled_assets,
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&mut self.pending_tasks,
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self.watching_for_changes,
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id,
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)
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@ -587,6 +590,11 @@ impl AssetInfos {
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}
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pub(crate) fn process_asset_fail(&mut self, failed_id: UntypedAssetId, error: AssetLoadError) {
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// Check whether the handle has been dropped since the asset was loaded.
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if !self.infos.contains_key(&failed_id) {
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return;
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}
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let (dependants_waiting_on_load, dependants_waiting_on_rec_load) = {
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let Some(info) = self.get_mut(failed_id) else {
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// The asset was already dropped.
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@ -648,6 +656,7 @@ impl AssetInfos {
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path_to_id: &mut HashMap<AssetPath<'static>, TypeIdMap<UntypedAssetId>>,
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loader_dependants: &mut HashMap<AssetPath<'static>, HashSet<AssetPath<'static>>>,
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living_labeled_assets: &mut HashMap<AssetPath<'static>, HashSet<Box<str>>>,
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pending_tasks: &mut HashMap<UntypedAssetId, Task<()>>,
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watching_for_changes: bool,
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id: UntypedAssetId,
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) -> bool {
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@ -662,6 +671,8 @@ impl AssetInfos {
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return false;
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}
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pending_tasks.remove(&id);
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let type_id = entry.key().type_id();
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let info = entry.remove();
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@ -704,6 +715,7 @@ impl AssetInfos {
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&mut self.path_to_id,
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&mut self.loader_dependants,
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&mut self.living_labeled_assets,
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&mut self.pending_tasks,
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self.watching_for_changes,
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id.untyped(provider.type_id),
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);
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@ -368,7 +368,8 @@ impl AssetServer {
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guard: G,
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) -> Handle<A> {
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let path = path.into().into_owned();
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let (handle, should_load) = self.data.infos.write().get_or_create_path_handle::<A>(
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let mut infos = self.data.infos.write();
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let (handle, should_load) = infos.get_or_create_path_handle::<A>(
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path.clone(),
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HandleLoadingMode::Request,
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meta_transform,
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@ -377,14 +378,18 @@ impl AssetServer {
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if should_load {
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let owned_handle = Some(handle.clone().untyped());
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let server = self.clone();
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IoTaskPool::get()
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.spawn(async move {
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if let Err(err) = server.load_internal(owned_handle, path, false, None).await {
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error!("{}", err);
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}
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drop(guard);
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})
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.detach();
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let task = IoTaskPool::get().spawn(async move {
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if let Err(err) = server.load_internal(owned_handle, path, false, None).await {
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error!("{}", err);
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}
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drop(guard);
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});
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#[cfg(not(any(target_arch = "wasm32", not(feature = "multi_threaded"))))]
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infos.pending_tasks.insert(handle.id().untyped(), task);
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#[cfg(any(target_arch = "wasm32", not(feature = "multi_threaded")))]
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task.detach();
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}
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handle
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@ -414,44 +419,47 @@ impl AssetServer {
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CowArc::Owned(format!("{source}--{UNTYPED_SOURCE_SUFFIX}").into())
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}
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});
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let (handle, should_load) = self
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.data
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.infos
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.write()
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.get_or_create_path_handle::<LoadedUntypedAsset>(
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path.clone().with_source(untyped_source),
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HandleLoadingMode::Request,
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meta_transform,
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);
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let mut infos = self.data.infos.write();
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let (handle, should_load) = infos.get_or_create_path_handle::<LoadedUntypedAsset>(
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path.clone().with_source(untyped_source),
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HandleLoadingMode::Request,
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meta_transform,
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);
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if !should_load {
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return handle;
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}
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let id = handle.id().untyped();
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let owned_handle = Some(handle.clone().untyped());
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let server = self.clone();
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IoTaskPool::get()
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.spawn(async move {
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let path_clone = path.clone();
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match server.load_untyped_async(path).await {
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Ok(handle) => server.send_asset_event(InternalAssetEvent::Loaded {
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let task = IoTaskPool::get().spawn(async move {
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let path_clone = path.clone();
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match server.load_internal(owned_handle, path, false, None).await {
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Ok(handle) => server.send_asset_event(InternalAssetEvent::Loaded {
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id,
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loaded_asset: LoadedAsset::new_with_dependencies(
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LoadedUntypedAsset { handle },
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None,
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)
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.into(),
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}),
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Err(err) => {
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error!("{err}");
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server.send_asset_event(InternalAssetEvent::Failed {
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id,
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loaded_asset: LoadedAsset::new_with_dependencies(
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LoadedUntypedAsset { handle },
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None,
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)
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.into(),
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}),
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Err(err) => {
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error!("{err}");
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server.send_asset_event(InternalAssetEvent::Failed {
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id,
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path: path_clone,
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error: err,
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});
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}
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path: path_clone,
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error: err,
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});
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}
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})
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.detach();
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}
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});
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#[cfg(not(any(target_arch = "wasm32", not(feature = "multi_threaded"))))]
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infos.pending_tasks.insert(handle.id().untyped(), task);
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#[cfg(any(target_arch = "wasm32", not(feature = "multi_threaded")))]
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task.detach();
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handle
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}
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@ -488,7 +496,7 @@ impl AssetServer {
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/// avoid looking up `should_load` twice, but it means you _must_ be sure a load is necessary when calling this function with [`Some`].
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async fn load_internal<'a>(
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&self,
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input_handle: Option<UntypedHandle>,
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mut input_handle: Option<UntypedHandle>,
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path: AssetPath<'a>,
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force: bool,
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meta_transform: Option<MetaTransform>,
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@ -512,6 +520,13 @@ impl AssetServer {
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}
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})?;
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if let Some(meta_transform) = input_handle.as_ref().and_then(|h| h.meta_transform()) {
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(*meta_transform)(&mut *meta);
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}
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// downgrade the input handle so we don't keep the asset alive just because we're loading it
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// note we can't just pass a weak handle in, as only strong handles contain the asset meta transform
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input_handle = input_handle.map(|h| h.clone_weak());
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// This contains Some(UntypedHandle), if it was retrievable
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// If it is None, that is because it was _not_ retrievable, due to
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// 1. The handle was not already passed in for this path, meaning we can't just use that
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@ -580,10 +595,6 @@ impl AssetServer {
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(handle.clone().unwrap(), path.clone())
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};
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if let Some(meta_transform) = base_handle.meta_transform() {
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(*meta_transform)(&mut *meta);
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}
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match self
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.load_with_meta_loader_and_reader(&base_path, meta, &*loader, &mut *reader, true, false)
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.await
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@ -721,40 +732,42 @@ impl AssetServer {
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&self,
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future: impl Future<Output = Result<A, E>> + Send + 'static,
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) -> Handle<A> {
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let handle = self
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.data
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.infos
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.write()
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.create_loading_handle_untyped(TypeId::of::<A>(), std::any::type_name::<A>());
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let mut infos = self.data.infos.write();
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let handle =
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infos.create_loading_handle_untyped(TypeId::of::<A>(), std::any::type_name::<A>());
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let id = handle.id();
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let event_sender = self.data.asset_event_sender.clone();
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IoTaskPool::get()
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.spawn(async move {
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match future.await {
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Ok(asset) => {
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let loaded_asset = LoadedAsset::new_with_dependencies(asset, None).into();
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event_sender
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.send(InternalAssetEvent::Loaded { id, loaded_asset })
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.unwrap();
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}
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Err(error) => {
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let error = AddAsyncError {
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error: Arc::new(error),
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};
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error!("{error}");
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event_sender
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.send(InternalAssetEvent::Failed {
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id,
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path: Default::default(),
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error: AssetLoadError::AddAsyncError(error),
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})
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.unwrap();
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}
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let task = IoTaskPool::get().spawn(async move {
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match future.await {
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Ok(asset) => {
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let loaded_asset = LoadedAsset::new_with_dependencies(asset, None).into();
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event_sender
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.send(InternalAssetEvent::Loaded { id, loaded_asset })
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.unwrap();
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}
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})
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.detach();
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Err(error) => {
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let error = AddAsyncError {
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error: Arc::new(error),
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};
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error!("{error}");
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event_sender
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.send(InternalAssetEvent::Failed {
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id,
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path: Default::default(),
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error: AssetLoadError::AddAsyncError(error),
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})
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.unwrap();
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}
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}
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});
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#[cfg(not(any(target_arch = "wasm32", not(feature = "multi_threaded"))))]
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infos.pending_tasks.insert(id, task);
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#[cfg(any(target_arch = "wasm32", not(feature = "multi_threaded")))]
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task.detach();
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handle.typed_debug_checked()
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}
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@ -1312,6 +1325,11 @@ pub fn handle_internal_asset_events(world: &mut World) {
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info!("Reloading {path} because it has changed");
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server.reload(path);
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}
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#[cfg(not(any(target_arch = "wasm32", not(feature = "multi_threaded"))))]
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infos
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.pending_tasks
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.retain(|_, load_task| !load_task.is_finished());
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});
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}
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