pub enum WindowUpdateMode {
    OnReceive,
    OnRead,
}
Expand description

Specifies when window update frames are sent.

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OnReceive

Send window updates as soon as a Stream’s receive window drops to 0.

This ensures that the sender can resume sending more data as soon as possible but a slow reader on the receiving side may be overwhelmed, i.e. it accumulates data in its buffer which may reach its limit (see set_max_buffer_size). In this mode, window updates merely prevent head of line blocking but do not effectively exercise back pressure on senders.

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OnRead

Send window updates only when data is read on the receiving end.

This ensures that senders do not overwhelm receivers and keeps buffer usage low. However, depending on the protocol, there is a risk of deadlock, namely if both endpoints want to send data larger than the receivers window and they do not read before finishing their writes. Use this mode only if you are sure that this will never happen, i.e. if

  • Endpoints A and B never write at the same time, or
  • Endpoints A and B write at most n frames concurrently such that the sum of the frame lengths is less or equal to the available credit of A and B respectively.

Trait Implementations§

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impl Clone for WindowUpdateMode

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fn clone(&self) -> WindowUpdateMode

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for WindowUpdateMode

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

Formats the value using the given formatter. Read more
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impl PartialEq<WindowUpdateMode> for WindowUpdateMode

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fn eq(&self, other: &WindowUpdateMode) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for WindowUpdateMode

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impl Eq for WindowUpdateMode

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impl StructuralEq for WindowUpdateMode

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impl StructuralPartialEq for WindowUpdateMode

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V