// Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.
pub
/// Client for Amazon DynamoDB Streams
///
/// Client for invoking operations on Amazon DynamoDB Streams. Each operation on Amazon DynamoDB Streams is a method on this
/// this struct. `.send()` MUST be invoked on the generated operations to dispatch the request to the service.
/// ## Constructing a `Client`
///
/// A [`Config`] is required to construct a client. For most use cases, the [`aws-config`]
/// crate should be used to automatically resolve this config using
/// [`aws_config::load_from_env()`], since this will resolve an [`SdkConfig`] which can be shared
/// across multiple different AWS SDK clients. This config resolution process can be customized
/// by calling [`aws_config::from_env()`] instead, which returns a [`ConfigLoader`] that uses
/// the [builder pattern] to customize the default config.
///
/// In the simplest case, creating a client looks as follows:
/// ```rust,no_run
/// # async fn wrapper() {
/// let config = aws_config::load_from_env().await;
/// let client = aws_sdk_dynamodbstreams::Client::new(&config);
/// # }
/// ```
///
/// Occasionally, SDKs may have additional service-specific that can be set on the [`Config`] that
/// is absent from [`SdkConfig`], or slightly different settings for a specific client may be desired.
/// The [`Config`] struct implements `From<&SdkConfig>`, so setting these specific settings can be
/// done as follows:
///
/// ```rust,no_run
/// # async fn wrapper() {
/// let sdk_config = ::aws_config::load_from_env().await;
/// let config = aws_sdk_dynamodbstreams::config::Builder::from(&sdk_config)
/// # /*
/// .some_service_specific_setting("value")
/// # */
/// .build();
/// # }
/// ```
///
/// See the [`aws-config` docs] and [`Config`] for more information on customizing configuration.
///
/// _Note:_ Client construction is expensive due to connection thread pool initialization, and should
/// be done once at application start-up.
///
/// [`Config`]: crate::Config
/// [`ConfigLoader`]: https://docs.rs/aws-config/*/aws_config/struct.ConfigLoader.html
/// [`SdkConfig`]: https://docs.rs/aws-config/*/aws_config/struct.SdkConfig.html
/// [`aws-config` docs]: https://docs.rs/aws-config/*
/// [`aws-config`]: https://crates.io/crates/aws-config
/// [`aws_config::from_env()`]: https://docs.rs/aws-config/*/aws_config/fn.from_env.html
/// [`aws_config::load_from_env()`]: https://docs.rs/aws-config/*/aws_config/fn.load_from_env.html
/// [builder pattern]: https://rust-lang.github.io/api-guidelines/type-safety.html#builders-enable-construction-of-complex-values-c-builder
/// # Using the `Client`
///
/// A client has a function for every operation that can be performed by the service.
/// For example, the [`DescribeStream`](crate::operation::describe_stream) operation has
/// a [`Client::describe_stream`], function which returns a builder for that operation.
/// The fluent builder ultimately has a `send()` function that returns an async future that
/// returns a result, as illustrated below:
///
/// ```rust,ignore
/// let result = client.describe_stream()
/// .stream_arn("example")
/// .send()
/// .await;
/// ```
///
/// The underlying HTTP requests that get made by this can be modified with the `customize_operation`
/// function on the fluent builder. See the [`customize`](crate::client::customize) module for more
/// information.
/// Operation customization and supporting types.
///
/// The underlying HTTP requests made during an operation can be customized
/// by calling the `customize()` method on the builder returned from a client
/// operation call. For example, this can be used to add an additional HTTP header:
///
/// ```ignore
/// # async fn wrapper() -> ::std::result::Result<(), aws_sdk_dynamodbstreams::Error> {
/// # let client: aws_sdk_dynamodbstreams::Client = unimplemented!();
/// use ::http::header::{HeaderName, HeaderValue};
///
/// let result = client.describe_stream()
/// .customize()
/// .await?
/// .mutate_request(|req| {
/// // Add `x-example-header` with value
/// req.headers_mut()
/// .insert(
/// HeaderName::from_static("x-example-header"),
/// HeaderValue::from_static("1"),
/// );
/// })
/// .send()
/// .await;
/// # }
/// ```