use serde helper function & serde shortcuts #735
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kuhe
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sample: effect on aws-sdk-js-v3's client-sagemaker Overall -24%, or -44% in the protocols file, for this particular JSON protocol client. Other examples:
The magnitude of the effect is based on how much of the protocol serde is composed of simple objects that don't need parsing. Doubles, floats (NaN & Infinity strings), timestamps and other types with parsing steps cause the optimization to bail. JSv3 overall dist-cjs byte count effect provided in linked PR. |
| * Incompatible types refers to types that need special serde mapping | ||
| * functions, like timestamps. | ||
| */ | ||
| private boolean hasIncompatibleTypes(Shape shape, Set<ShapeType> types, int depth) { |
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is there a selector equivalent for this?
| Set<Shape> matches = selector.select(model); | ||
| boolean found = !matches.isEmpty(); | ||
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| if (found) { |
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can be return found from here
| * For determining whether a serde function for a shape may be omitted. | ||
| */ | ||
| public final class SerdeElision { | ||
| private static final Map<Model, SerdeElision> INSTANCES = new ConcurrentHashMap<>(); |
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This will leak memory, usually better to use an LRU cache with a capped size or something else that the GC can collect.
return Promise.resolve(...)in async fn.take(...)from feat(codegen): add serde helper function aws/aws-sdk-js-v3#4616 to reduce repeated field names in object mapping.(_) => expectString(_)toexpectStringSerdeElisionhelper. This decides whether a serde function can be omitted.becomes
where
_jsonis a helper function that applies recursive default json serde behavior (omit nullish, filter sparse lists). This allows the omission ofde_MyShapeand any downstream serde functions. This optimization only occurs if the entire shape and its downstream shapes require no special parsing.