Struct Loader 

pub struct Loader { /* private fields */ }

Loads and tracks lifetimes of asset data.

Implementations

impl Loader

pub fn new(io: Box<dyn LoaderIO>) -> Loader

pub fn new_with_handle_allocator( io: Box<dyn LoaderIO>, handle_allocator: Arc<dyn HandleAllocator>, ) -> Loader

pub fn with_serde_context<R>( &self, tx: &Sender<RefOp>, f: impl FnMut() -> R, ) -> R

pub fn get_load(&self, id: AssetUuid) -> Option<LoadHandle>

Returns the load handle for the asset with the given UUID, if present.

This will only return Some(..) if there has been a previous call to Loader::add_ref.

Parameters

• id: UUID of the asset.

pub fn get_load_info(&self, load: LoadHandle) -> Option<LoadInfo>

Returns information about the load of an asset.

Note: The information is true at the time the LoadInfo is retrieved. The actual number of references may change.

Parameters

• load_handle: ID allocated by Loader to track loading of the asset.

pub fn get_active_loads(&self) -> Vec<LoadHandle>

Returns handles to all active asset loads.

pub fn get_load_status(&self, load: LoadHandle) -> LoadStatus

Returns the asset load status.

Parameters

• load: ID allocated by Loader to track loading of the asset.

pub fn add_ref_handle(&self, handle: LoadHandle)

pub fn add_ref<U: Into<AssetUuid>>(&self, id: U) -> LoadHandle

Adds a reference to an asset and returns its LoadHandle.

If the asset is already loaded, this returns the existing LoadHandle. If it is not loaded, this allocates a new LoadHandle and returns that.

Parameters

• id: UUID of the asset.

pub fn add_ref_indirect(&self, id: IndirectIdentifier) -> LoadHandle

Adds a reference to an indirect id and returns its LoadHandle with LoadHandle::is_indirect set to true.

Parameters

• id: IndirectIdentifier for the load.

pub fn get_asset_type(&self, load: LoadHandle) -> Option<AssetTypeId>

Returns the AssetTypeId for the currently loaded asset of the provided load handle.

Parameters

• load: ID allocated by Loader to track loading of the asset.

pub fn remove_ref(&self, load: LoadHandle)

Removes a reference to an asset.

Parameters

• load_handle: ID allocated by Loader to track loading of the asset.

pub fn process( &mut self, asset_storage: &dyn AssetStorage, resolver: &dyn IndirectionResolver, ) -> Result<()>

Processes pending load operations.

Load operations include:

• Requesting asset metadata.
• Requesting asset data.
• Committing completed AssetLoadOps.
• Updating the LoadStatuses of assets.
• Resolving active IndirectIdentifiers.

Parameters

• asset_storage: Storage for all assets of all asset types.

pub fn indirection_table(&self) -> IndirectionTable

Returns a reference to the loader’s IndirectionTable.

When a user fetches an asset by LoadHandle, implementors of AssetStorage should resolve LoadHandles where LoadHandle::is_indirect returns true by using IndirectionTable::resolve. IndirectionTable is Send + Sync + Clone so that it can be retrieved once at startup, then stored in implementors of AssetStorage.

pub fn invalidate_assets(&self, assets: &[AssetUuid])

Invalidates the data & metadata of the provided asset IDs.

This causes the asset data to be reloaded.

pub fn invalidate_paths(&self, paths: &[PathBuf])

Invalidates indirect identifiers that may match the provided paths.

This may cause indirect handles to resolve to new assets.