risingwave_stream::common::log_store_impl::in_mem

Struct BoundedInMemLogStoreReader

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pub struct BoundedInMemLogStoreReader {
    epoch_progress: LogReaderEpochProgress,
    init_epoch_rx: Option<Receiver<u64>>,
    item_rx: Receiver<InMemLogStoreItem>,
    truncated_epoch_tx: UnboundedSender<u64>,
    latest_offset: TruncateOffset,
    truncate_offset: TruncateOffset,
}

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§epoch_progress: LogReaderEpochProgress

Current progress of log reader. Can be either consuming an epoch, or has finished consuming an epoch and waiting to be truncated.

§init_epoch_rx: Option<Receiver<u64>>

Holder for oneshot channel to receive the initial epoch

§item_rx: Receiver<InMemLogStoreItem>

Receiver to fetch log store item

§truncated_epoch_tx: UnboundedSender<u64>

Sender of consumed epoch to the log writer

§latest_offset: TruncateOffset

Offset of the latest emitted item

§truncate_offset: TruncateOffset

Offset of the latest truncated item

Trait Implementations§

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impl LogReader for BoundedInMemLogStoreReader

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async fn init(&mut self) -> LogStoreResult<()>

Initialize the log reader. Usually function as waiting for log writer to be initialized.
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async fn next_item(&mut self) -> LogStoreResult<(u64, LogStoreReadItem)>

Emit the next item. Read more
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fn truncate(&mut self, offset: TruncateOffset) -> LogStoreResult<()>

Mark that all items emitted so far have been consumed and it is safe to truncate the log from the current offset.
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async fn rewind(&mut self) -> LogStoreResult<(bool, Option<Bitmap>)>

Reset the log reader to after the latest truncate offset Read more

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