org.apache.flink.runtime.io.network.api.writer

Class SingleRecordWriter<T extends org.apache.flink.core.io.IOReadableWritable>

java.lang.Object

org.apache.flink.runtime.io.network.api.writer.SingleRecordWriter<T>

All Implemented Interfaces:

AutoCloseable, AvailabilityProvider, RecordWriterDelegate<T>

public class SingleRecordWriter<T extends org.apache.flink.core.io.IOReadableWritable>
extends Object
implements RecordWriterDelegate<T>

The specific delegate implementation for the single output case.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.runtime.io.AvailabilityProvider

AvailabilityProvider.AvailabilityHelper

Field Summary

Fields inherited from interface org.apache.flink.runtime.io.AvailabilityProvider

AVAILABLE

Constructor Summary

Constructors

Constructor and Description
SingleRecordWriter(RecordWriter<T> recordWriter)

Method Summary

Modifier and Type	Method and Description
void	broadcastEvent(AbstractEvent event) Broadcasts the provided event to all the internal record writer instances.
void	close()
CompletableFuture<?>	getAvailableFuture()
RecordWriter<T>	getRecordWriter(int outputIndex) Returns the internal actual record writer instance based on the output index.
boolean	isAvailable() In order to best-effort avoid volatile access in CompletableFuture.isDone(), we check the condition of future == AVAILABLE firstly for getting probable performance benefits while hot looping.

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.runtime.io.AvailabilityProvider

isApproximatelyAvailable

Constructor Detail

SingleRecordWriter

public SingleRecordWriter(RecordWriter<T> recordWriter)

Method Detail

broadcastEvent

public void broadcastEvent(AbstractEvent event)
                    throws IOException

Description copied from interface: RecordWriterDelegate

Broadcasts the provided event to all the internal record writer instances.

Specified by:

broadcastEvent in interface RecordWriterDelegate<T extends org.apache.flink.core.io.IOReadableWritable>

Parameters:

event - the event to be emitted to all the output channels.

Throws:

IOException

getRecordWriter

public RecordWriter<T> getRecordWriter(int outputIndex)

Description copied from interface: RecordWriterDelegate

Returns the internal actual record writer instance based on the output index.

Specified by:

getRecordWriter in interface RecordWriterDelegate<T extends org.apache.flink.core.io.IOReadableWritable>

Parameters:

outputIndex - the index respective to the record writer instance.

getAvailableFuture

public CompletableFuture<?> getAvailableFuture()

Specified by:

getAvailableFuture in interface AvailabilityProvider

Returns:

a future that is completed if the respective provider is available.

isAvailable

public boolean isAvailable()

Description copied from interface: AvailabilityProvider

In order to best-effort avoid volatile access in CompletableFuture.isDone(), we check the condition of future == AVAILABLE firstly for getting probable performance benefits while hot looping.

It is always safe to use this method in performance nonsensitive scenarios to get the precise state.

Specified by:

isAvailable in interface AvailabilityProvider

Returns:

true if this instance is available for further processing.

close

public void close()

Specified by:

close in interface AutoCloseable