Struct mz_persist_client::read::Cursor

pub struct Cursor<K: Codec, V: Codec, T: Timestamp + Codec64, D: Codec64> {
    consolidator: CursorConsolidator<K, V, T, D>,
    _lease: Lease,
    read_schemas: Schemas<K, V>,
}

Expand description

An incremental cursor through a particular shard, returned from ReadHandle::snapshot_cursor.

To read an entire dataset, the client should call next until it returns None, which signals all data has been returned… but it’s also free to abandon the instance at any time if it eg. only needs a few entries.

Fields§

§consolidator: CursorConsolidator<K, V, T, D>§_lease: Lease§read_schemas: Schemas<K, V>

Implementations§

impl<K, V, T, D> Cursor<K, V, T, D>
where K: Debug + Codec + Ord, V: Debug + Codec + Ord, T: Timestamp + Lattice + Codec64 + Sync, D: Semigroup + Ord + Codec64 + Send + Sync,

pub async fn next( &mut self, ) -> Option<impl Iterator<Item = ((Result<K, String>, Result<V, String>), T, D)> + '_>

Grab the next batch of consolidated data.

Trait Implementations§

impl<K: Debug + Codec, V: Debug + Codec, T: Debug + Timestamp + Codec64, D: Debug + Codec64> Debug for Cursor<K, V, T, D>

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

impl<K, V, T, D> Freeze for Cursor<K, V, T, D>
where T: Freeze,

impl<K, V, T, D> !RefUnwindSafe for Cursor<K, V, T, D>

impl<K, V, T, D> Send for Cursor<K, V, T, D>
where T: Sync,

impl<K, V, T, D> Sync for Cursor<K, V, T, D>
where T: Sync,

impl<K, V, T, D> Unpin for Cursor<K, V, T, D>
where T: Unpin,

impl<K, V, T, D> !UnwindSafe for Cursor<K, V, T, D>

Blanket Implementations§

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

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

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Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more

impl<T, U> CastInto<U> for T
where U: CastFrom<T>,

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Performs the cast.

impl<T> CopyAs<T> for T

fn copy_as(self) -> T

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Returns the argument unchanged.

impl<T> FutureExt for T

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Attaches the provided Context to this type, returning a WithContext wrapper. Read more

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Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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where U: From<T>,

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Calls U::from(self).

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

impl<T> IntoRequest<T> for T

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Wrap the input message T in a tonic::Request

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where Shared: FromUnshared<Unshared>,

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Creates a shared type from an unshared type.

impl<T> Pointable for T

const ALIGN: usize = _

The alignment of pointer.

type Init = T

The type for initializers.

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more

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Dereferences the given pointer. Read more

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Mutably dereferences the given pointer. Read more

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Drops the object pointed to by the given pointer. Read more

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where R: RustType<P>,

fn into_rust(self) -> Result<R, TryFromProtoError>

See RustType::from_proto.

fn from_rust(rust: &R) -> P

See RustType::into_proto.

impl<T> Same for T

type Output = T

Should always be Self

impl<'a, S, T> Semigroup<&'a S> for T
where T: Semigroup<S>,

fn plus_equals(&mut self, rhs: &&'a S)

The method of std::ops::AddAssign, for types that do not implement AddAssign.

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where U: Into<T>,

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The type returned in the event of a conversion error.

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Performs the conversion.

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The type returned in the event of a conversion error.

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Performs the conversion.

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impl<T> WithSubscriber for T

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where S: Into<Dispatch>,

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Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more