Repository: tokio-rs/tokio
File: tokio-stream/src/stream_ext.rs (Rust)

Code before:
    ///
    /// loop {
    ///     // The string will be produced at most every 2 seconds
    ///     println!("{:?}", item_stream.next().await);
    /// }
    /// # }
    /// ```
    #[cfg(all(feature = "time"))]
    #[cfg_attr(docsrs, doc(cfg(feature = "time")))]
    fn throttle(self, duration: Duration) -> Throttle<Self>
    where
        Self: Sized,
    {
        throttle(duration, self)
    }



    /// Batches the items in the given stream using a maximum duration and size for each batch.
    ///
    /// This stream returns the next batch of items in the following situations:
    ///  1. The inner stream has returned at least `max_size` many items since the last batch.
    ///  2. The time since the first element of a batch is greater than the given duration.
    ///  3. The end of the stream is reached
    ///
    /// The length of the returned vector is never empty or greater than capacity. Empty batches
    /// will not be emitted if no items are received upstream.
    ///
    /// # Example
    ///
    /// ```rust,no_run
    /// use std::time::Duration;
    /// use tokio::time;
    /// use tokio_stream::{self as stream, StreamExt};
    /// use futures::FutureExt;
    ///
    /// #[tokio::main]
    /// async fn main() {
    ///     let iter = vec![1, 2, 3, 4].into_iter();
    ///     let stream0 = stream::iter(iter);
    ///
    ///     let iter = vec![5].into_iter();
    ///     let stream1 = stream::iter(iter)
    ///          .then(move |n| time::sleep(Duration::from_secs(5)).map(move |_| n));
    ///
    ///     let chunk_stream = stream0
    ///         .chain(stream1)
    ///         .chunks_timeout(3, Duration::from_secs(2));
    ///     tokio::pin!(chunk_stream);
    ///
    ///     // a full batch was received

Review comment (performance):
```suggestion
    /// The length of the returned vector is never empty or greater than the maximum size. Empty batches
```

Code after:
    ///
    /// loop {
    ///     // The string will be produced at most every 2 seconds
    ///     println!("{:?}", item_stream.next().await);
    /// }
    /// # }
    /// ```
    #[cfg(all(feature = "time"))]
    #[cfg_attr(docsrs, doc(cfg(feature = "time")))]
    fn throttle(self, duration: Duration) -> Throttle<Self>
    where
        Self: Sized,
    {
        throttle(duration, self)
    }

    /// Batches the items in the given stream using a maximum duration and size for each batch.
    ///
    /// This stream returns the next batch of items in the following situations:
    ///  1. The inner stream has returned at least `max_size` many items since the last batch.
    ///  2. The time since the first item of a batch is greater than the given duration.
    ///  3. The end of the stream is reached.
    ///
    /// The length of the returned vector is never empty or greater than the maximum size. Empty batches
    /// will not be emitted if no items are received upstream.
    ///
    /// # Panics
    ///
    /// This function panics if `max_size` is zero
    ///
    /// # Example
    ///
    /// ```rust
    /// use std::time::Duration;
    /// use tokio::time;
    /// use tokio_stream::{self as stream, StreamExt};
    /// use futures::FutureExt;
    ///
    /// #[tokio::main]
    /// # async fn _unused() {}
    /// # #[tokio::main(flavor = "current_thread", start_paused = true)]
    /// async fn main() {
    ///     let iter = vec![1, 2, 3, 4].into_iter();
    ///     let stream0 = stream::iter(iter);
    ///
    ///     let iter = vec![5].into_iter();
    ///     let stream1 = stream::iter(iter)
    ///          .then(move |n| time::sleep(Duration::from_secs(5)).map(move |_| n));
    ///
    ///     let chunk_stream = stream0
    ///         .chain(stream1)