Trait AssetKey 

pub trait AssetKey: Key + 'static {
    type Asset: Send + Sync + 'static;

    // Required method
    fn asset_eq(old: &Self::Asset, new: &Self::Asset) -> bool;

    // Provided method
    fn durability(&self) -> DurabilityLevel { ... }
}

Trait for asset keys that map to loadable assets.

Asset keys identify external resources (files, URLs, etc.) and define the type of asset they load. Assets are leaf nodes in the dependency graph - they have no dependencies but can be depended upon by queries.

Example

use query_flow::{asset_key, AssetKey, DurabilityLevel};

#[asset_key(asset = String)]
pub struct ConfigFile(pub PathBuf);

#[asset_key(asset = String, durability = constant)]
pub struct BundledFile(pub PathBuf);

// Or manually:
pub struct TextureId(pub u32);

impl AssetKey for TextureId {
    type Asset = ImageData;

    fn asset_eq(old: &Self::Asset, new: &Self::Asset) -> bool {
        old.bytes == new.bytes
    }

    fn durability(&self) -> DurabilityLevel {
        DurabilityLevel::Constant
    }
}

Required Associated Types

type Asset: Send + Sync + 'static

The asset type this key loads.

Required Methods

fn asset_eq(old: &Self::Asset, new: &Self::Asset) -> bool

Compare two asset values for equality (for early cutoff).

When an asset is re-resolved with the same value, dependent queries can skip recomputation (early cutoff).

Provided Methods

fn durability(&self) -> DurabilityLevel

Durability level for this asset type.

Higher values indicate the asset changes less frequently. Default: Volatile (changes frequently).

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors