pub struct PendingPeek {
    peek: Peek,
    trace_bundle: TraceBundle,
    span: Span,
}
Expand description

An in-progress peek, and data to eventually fulfill it.

Note that PendingPeek intentionally does not implement or derive Clone, as each PendingPeek is meant to be dropped after it’s responded to.

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§peek: Peek§trace_bundle: TraceBundle

The data from which the trace derives.

§span: Span

The tracing::Span tracking this peek’s operation

Implementations§

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impl PendingPeek

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pub fn as_log_event(&self) -> Peek

Produces a corresponding log event.

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fn seek_fulfillment( &mut self, upper: &mut Antichain<Timestamp>, max_result_size: u32 ) -> Option<PeekResponse>

Attempts to fulfill the peek and reports success.

To produce output at peek.timestamp, we must be certain that it is no longer changing. A trace guarantees that all future changes will be greater than or equal to an element of upper.

If an element of upper is less or equal to peek.timestamp, then there can be further updates that would change the output. If no element of upper is less or equal to peek.timestamp, then for any time t less or equal to peek.timestamp it is not the case that upper is less or equal to that timestamp, and so the result cannot further evolve.

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fn collect_finished_data( &mut self, max_result_size: u32 ) -> Result<Vec<(Row, NonZeroUsize)>, String>

Collects data for a known-complete peek from the ok stream.

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fn dispatch_collect_ok_finished_data( &mut self, max_result_size: u32 ) -> Result<Vec<(Row, NonZeroUsize)>, String>

Dispatches peek finishing of data in the ok stream according to arrangement key-value types.

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fn collect_ok_finished_data<Tr, K, V>( peek: &mut Peek<Timestamp>, oks_handle: &mut TraceAgent<Tr>, key_types: Option<&[ColumnType]>, val_types: Option<&[ColumnType]>, max_result_size: u32 ) -> Result<Vec<(Row, NonZeroUsize)>, String>where Tr: TraceReader<Key = K, Val = V, Time = Timestamp, R = Diff>, Tr::Key: Columnation + Data + FromRowByTypes + IntoRowByTypes, Tr::Val: Columnation + Data + IntoRowByTypes,

Collects data for a known-complete peek from the ok stream.

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