Struct mz_adapter::ReadHolds
source · pub struct ReadHolds<T: TimelyTimestamp> {
pub inner: ReadHoldsInner<T>,
/* private fields */
}
Expand description
ReadHolds are used for short-lived read holds. For example, when processing peeks or rendering dataflows. These are never downgraded but they are released automatically when being dropped.
Fields§
§inner: ReadHoldsInner<T>
Implementations§
source§impl<T: TimelyTimestamp> ReadHolds<T>
impl<T: TimelyTimestamp> ReadHolds<T>
sourcepub fn new(
read_holds: ReadHoldsInner<T>,
dropped_read_holds_tx: UnboundedSender<ReadHoldsInner<T>>
) -> Self
pub fn new( read_holds: ReadHoldsInner<T>, dropped_read_holds_tx: UnboundedSender<ReadHoldsInner<T>> ) -> Self
Return empty ReadHolds
.
Methods from Deref<Target = ReadHoldsInner<T>>§
sourcepub fn id_bundle(&self) -> CollectionIdBundle
pub fn id_bundle(&self) -> CollectionIdBundle
Return a CollectionIdBundle
containing all the IDs in the
ReadHoldsInner.
pub fn least_valid_read(&self) -> Antichain<T>
sourcepub fn since(&self, desired_id: &GlobalId) -> Antichain<T>
pub fn since(&self, desired_id: &GlobalId) -> Antichain<T>
Returns the frontier at which this ReadHoldsInner is holding back the
since of the collection identified by id
. This does not mean that the
overall since of the collection is what we report here. Only that it is
at least held back to the reported frontier by this read hold.
This method is not meant to be fast, use wisely!
Trait Implementations§
source§impl<T: TimelyTimestamp> Debug for ReadHolds<T>
impl<T: TimelyTimestamp> Debug for ReadHolds<T>
source§impl<T: TimelyTimestamp> Deref for ReadHolds<T>
impl<T: TimelyTimestamp> Deref for ReadHolds<T>
§type Target = ReadHoldsInner<T>
type Target = ReadHoldsInner<T>
The resulting type after dereferencing.
source§fn deref(&self) -> &ReadHoldsInner<T>
fn deref(&self) -> &ReadHoldsInner<T>
Dereferences the value.
Auto Trait Implementations§
impl<T> Freeze for ReadHolds<T>
impl<T> !RefUnwindSafe for ReadHolds<T>
impl<T> Send for ReadHolds<T>
impl<T> Sync for ReadHolds<T>
impl<T> Unpin for ReadHolds<T>where
T: Unpin,
impl<T> !UnwindSafe for ReadHolds<T>
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fn copy_onto( self, target: &mut ConsecutiveOffsetPairs<R, O> ) -> <ConsecutiveOffsetPairs<R, O> as Region>::Index
Copy self into the target container, returning an index that allows to
look up the corresponding read item.
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