org.apache.flink.runtime.io.network.partition.hybrid

Interface HsDataView

All Known Subinterfaces:

HsSubpartitionFileReader

All Known Implementing Classes:

HsSubpartitionConsumerMemoryDataManager, HsSubpartitionFileReaderImpl

public interface HsDataView

A view for HsSubpartitionConsumer to find out what data exists in memory or disk and polling the data.

Method Summary

Modifier and Type	Method and Description
Optional<ResultSubpartition.BufferAndBacklog>	consumeBuffer(int nextBufferToConsume, Collection<Buffer> buffersToRecycle) Try to consume next buffer.
int	getBacklog() Get the number of buffers backlog.
Buffer.DataType	peekNextToConsumeDataType(int nextBufferToConsume, Collection<Buffer> buffersToRecycle) Get dataType of next buffer to consume.
void	releaseDataView() Release this HsDataView when related subpartition view is releasing.

Method Detail

consumeBuffer

Optional<ResultSubpartition.BufferAndBacklog> consumeBuffer(int nextBufferToConsume,
                                                            Collection<Buffer> buffersToRecycle)
                                                     throws Throwable

Try to consume next buffer.

Only invoked by consumer thread.

Parameters:

nextBufferToConsume - next buffer index to consume.

buffersToRecycle - buffers to recycle if needed.

Returns:

If the target buffer does exist, return buffer and next buffer's backlog, otherwise return Optional.empty().

Throws:

Throwable

peekNextToConsumeDataType

Buffer.DataType peekNextToConsumeDataType(int nextBufferToConsume,
                                          Collection<Buffer> buffersToRecycle)

Get dataType of next buffer to consume.

Parameters:

nextBufferToConsume - next buffer index to consume

buffersToRecycle - buffers to recycle if needed.

Returns:

next buffer's dataType. If not found in memory, return Buffer.DataType.NONE.

getBacklog

int getBacklog()

Get the number of buffers backlog.

Returns:

backlog of this view's corresponding subpartition.

releaseDataView

void releaseDataView()

Release this HsDataView when related subpartition view is releasing.