pub struct ConfigBag { /* private fields */ }
Expand description

Layered configuration structure

See the module docs for more documentation.

Implementations§

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impl ConfigBag

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pub fn base() -> ConfigBag

Create a new config bag “base”.

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pub fn of_layers(layers: impl IntoIterator<Item = Layer>) -> ConfigBag

Create a ConfigBag consisting of the given layers.

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pub fn push_layer(&mut self, layer: Layer) -> &mut ConfigBag

Add the given layer to the config bag.

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pub fn push_shared_layer(&mut self, layer: FrozenLayer) -> &mut ConfigBag

Add a frozen/shared layer to the config bag.

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pub fn interceptor_state(&mut self) -> &mut Layer

Return a reference to the mutable interceptor state.

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pub fn load<T>(&self) -> <<T as Storable>::Storer as Store>::ReturnedType<'_>
where T: Storable,

Load a value (or values) of type T depending on how T implements Storable

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pub fn get_mut<T>(&mut self) -> Option<&mut T>
where T: Send + Sync + Debug + Clone + 'static + Storable<Storer = StoreReplace<T>>,

Return a mutable reference to T if it is stored in the top layer of the bag

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pub fn get_mut_or_default<T>(&mut self) -> &mut T
where T: Send + Sync + Debug + Clone + Default + 'static + Storable<Storer = StoreReplace<T>>,

Returns a mutable reference to T if it is stored in the top layer of the bag

  • If T is in a deeper layer of the bag, that value will be cloned and inserted into the top layer
  • If T is not present in the bag, the Default implementation will be used.
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pub fn get_mut_or_else<T>(&mut self, default: impl Fn() -> T) -> &mut T
where T: Send + Sync + Debug + Clone + 'static + Storable<Storer = StoreReplace<T>>,

Returns a mutable reference to T if it is stored in the top layer of the bag

  • If T is in a deeper layer of the bag, that value will be cloned and inserted into the top layer
  • If T is not present in the bag, default will be used to construct a new value
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pub fn with_fn( self, name: impl Into<Cow<'static, str>>, next: impl Fn(&mut Layer) ) -> ConfigBag

Add another layer to this configuration bag

Hint: If you want to re-use this layer, call freeze first.

§Examples
use aws_smithy_types::config_bag::{ConfigBag, Layer, Storable, StoreReplace};

#[derive(Debug, Eq, PartialEq)]
struct ExampleStr(&'static str);
impl Storable for ExampleStr {
    type Storer = StoreReplace<Self>;
}

#[derive(Debug, Eq, PartialEq)]
struct ExampleInt(i32);
impl Storable for ExampleInt {
    type Storer = StoreReplace<Self>;
}

let mut bag = ConfigBag::base();
bag = bag.with_fn("first", |layer: &mut Layer| { layer.store_put(ExampleStr("a")); });

// We can now load the example string out
assert_eq!(bag.load::<ExampleStr>(), Some(&ExampleStr("a")));

// But there isn't a number stored in the bag yet
assert_eq!(bag.load::<ExampleInt>(), None);

// Add a layer with an example int
bag = bag.with_fn("second", |layer: &mut Layer| { layer.store_put(ExampleInt(1)); });

// Now the example int can be retrieved
assert_eq!(bag.load::<ExampleInt>(), Some(&ExampleInt(1)));
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pub fn add_layer(self, name: impl Into<Cow<'static, str>>) -> ConfigBag

Add a new layer with name after freezing the top layer so far

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pub fn sourced_get<T>(&self) -> <T as Store>::ReturnedType<'_>
where T: Store,

Return a value (or values) of type T depending on how it has been stored in a ConfigBag

It flexibly chooses to return a single value vs. an iterator of values depending on how T implements a Store trait.

Trait Implementations§

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impl Debug for ConfigBag

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

Formats the value using the given formatter. Read more

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where T: ?Sized,

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

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