org.apache.flink.streaming.runtime.io

Class StreamTaskNetworkInput<T>

java.lang.Object

org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput<T>

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.flink.runtime.io.AvailabilityProvider, PushingAsyncDataInput<T>, StreamTaskInput<T>

@Internal
public final class StreamTaskNetworkInput<T>
extends Object
implements StreamTaskInput<T>

Implementation of StreamTaskInput that wraps an input from network taken from CheckpointedInputGate.

This internally uses a StatusWatermarkValve to keep track of Watermark and StreamStatus events, and forwards them to event subscribers once the StatusWatermarkValve determines the Watermark from all inputs has advanced, or that a StreamStatus needs to be propagated downstream to denote a status change.

Forwarding elements, watermarks, or status status elements must be protected by synchronizing on the given lock object. This ensures that we don't call methods on a StreamInputProcessor concurrently with the timer callback or other things.

Nested Class Summary

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

PushingAsyncDataInput.DataOutput<T>

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

org.apache.flink.runtime.io.AvailabilityProvider.AvailabilityHelper

Field Summary

Fields inherited from interface org.apache.flink.streaming.runtime.io.StreamTaskInput

UNSPECIFIED

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

AVAILABLE

Constructor Summary

Constructors

Constructor and Description
StreamTaskNetworkInput(CheckpointedInputGate checkpointedInputGate, org.apache.flink.api.common.typeutils.TypeSerializer<?> inputSerializer, org.apache.flink.runtime.io.disk.iomanager.IOManager ioManager, StatusWatermarkValve statusWatermarkValve, int inputIndex)

Method Summary

Modifier and Type	Method and Description
void	close()
InputStatus	emitNext(PushingAsyncDataInput.DataOutput<T> output) Pushes the next element to the output from current data input, and returns the input status to indicate whether there are more available data in current input.
CompletableFuture<?>	getAvailableFuture()
int	getInputIndex() Returns the input index of this input.

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, isAvailable

Constructor Detail

StreamTaskNetworkInput

public StreamTaskNetworkInput(CheckpointedInputGate checkpointedInputGate,
                              org.apache.flink.api.common.typeutils.TypeSerializer<?> inputSerializer,
                              org.apache.flink.runtime.io.disk.iomanager.IOManager ioManager,
                              StatusWatermarkValve statusWatermarkValve,
                              int inputIndex)

Method Detail

emitNext

public InputStatus emitNext(PushingAsyncDataInput.DataOutput<T> output)
                     throws Exception

Description copied from interface: PushingAsyncDataInput

Pushes the next element to the output from current data input, and returns the input status to indicate whether there are more available data in current input.

This method should be non blocking.

Specified by:

emitNext in interface PushingAsyncDataInput<T>

Throws:

Exception

getInputIndex

public int getInputIndex()

Description copied from interface: StreamTaskInput

Returns the input index of this input.

Specified by:

getInputIndex in interface StreamTaskInput<T>

getAvailableFuture

public CompletableFuture<?> getAvailableFuture()

Specified by:

getAvailableFuture in interface org.apache.flink.runtime.io.AvailabilityProvider

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException