Package org.apache.flink.connector.base.source.hybrid

Class HybridSourceReader<T>

java.lang.Object

org.apache.flink.connector.base.source.hybrid.HybridSourceReader<T>

All Implemented Interfaces:

AutoCloseable, org.apache.flink.api.common.state.CheckpointListener, org.apache.flink.api.connector.source.SourceReader<T,HybridSourceSplit>

public class HybridSourceReader<T>
extends Object
implements org.apache.flink.api.connector.source.SourceReader<T,HybridSourceSplit>

Hybrid source reader that delegates to the actual source reader.

This reader processes splits from a sequence of sources as determined by the enumerator. The current source is provided with SwitchSourceEvent and the reader does not require upfront knowledge of the number and order of sources. At a given point in time one underlying reader is active.

When the underlying reader has consumed all input for a source, HybridSourceReader sends SourceReaderFinishedEvent to the coordinator.

This reader does not make assumptions about the order in which sources are activated. When recovering from a checkpoint it may start processing splits for a previous source, which is indicated via SwitchSourceEvent.

Constructor Summary

Constructors

Constructor	Description
HybridSourceReader(org.apache.flink.api.connector.source.SourceReaderContext readerContext)

Method Summary

Modifier and Type	Method	Description
void	addSplits(List<HybridSourceSplit> splits)
void	close()
void	handleSourceEvents(org.apache.flink.api.connector.source.SourceEvent sourceEvent)
CompletableFuture<Void>	isAvailable()
void	notifyCheckpointAborted(long checkpointId)
void	notifyCheckpointComplete(long checkpointId)
void	notifyNoMoreSplits()
org.apache.flink.core.io.InputStatus	pollNext(org.apache.flink.api.connector.source.ReaderOutput output)
List<HybridSourceSplit>	snapshotState(long checkpointId)
void	start()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.flink.api.connector.source.SourceReader

pauseOrResumeSplits

Constructor Detail

HybridSourceReader

public HybridSourceReader(org.apache.flink.api.connector.source.SourceReaderContext readerContext)

Method Detail

start

public void start()

Specified by:

start in interface org.apache.flink.api.connector.source.SourceReader<T,HybridSourceSplit>

pollNext

public org.apache.flink.core.io.InputStatus pollNext(org.apache.flink.api.connector.source.ReaderOutput output)
                                              throws Exception

Specified by:

pollNext in interface org.apache.flink.api.connector.source.SourceReader<T,HybridSourceSplit>

Throws:

Exception

snapshotState

public List<HybridSourceSplit> snapshotState(long checkpointId)

Specified by:

snapshotState in interface org.apache.flink.api.connector.source.SourceReader<T,HybridSourceSplit>

notifyCheckpointComplete

public void notifyCheckpointComplete(long checkpointId)
                              throws Exception

Specified by:

notifyCheckpointComplete in interface org.apache.flink.api.common.state.CheckpointListener

Specified by:

notifyCheckpointComplete in interface org.apache.flink.api.connector.source.SourceReader<T,HybridSourceSplit>

Throws:

Exception

notifyCheckpointAborted

public void notifyCheckpointAborted(long checkpointId)
                             throws Exception

Specified by:

notifyCheckpointAborted in interface org.apache.flink.api.common.state.CheckpointListener

Throws:

Exception

isAvailable

public CompletableFuture<Void> isAvailable()

Specified by:

isAvailable in interface org.apache.flink.api.connector.source.SourceReader<T,HybridSourceSplit>

addSplits

public void addSplits(List<HybridSourceSplit> splits)

Specified by:

addSplits in interface org.apache.flink.api.connector.source.SourceReader<T,HybridSourceSplit>

notifyNoMoreSplits

public void notifyNoMoreSplits()

Specified by:

notifyNoMoreSplits in interface org.apache.flink.api.connector.source.SourceReader<T,HybridSourceSplit>

handleSourceEvents

public void handleSourceEvents(org.apache.flink.api.connector.source.SourceEvent sourceEvent)

Specified by:

handleSourceEvents in interface org.apache.flink.api.connector.source.SourceReader<T,HybridSourceSplit>

close

public void close()
           throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception