org.apache.flink.streaming.api.functions.co

Class BaseBroadcastProcessFunction.ReadOnlyContext

java.lang.Object

org.apache.flink.streaming.api.functions.co.BaseBroadcastProcessFunction.ReadOnlyContext

Direct Known Subclasses:

BroadcastProcessFunction.ReadOnlyContext, KeyedBroadcastProcessFunction.ReadOnlyContext

Enclosing class:

BaseBroadcastProcessFunction

public abstract class BaseBroadcastProcessFunction.ReadOnlyContext
extends Object

A context available to the non-broadcasted stream side of a BroadcastConnectedStream.

Apart from the basic functionality of a context, this also allows to get a read-only Iterable over the elements stored in the broadcast state.

Constructor Summary

Constructors

Constructor and Description
ReadOnlyContext()

Method Summary

Modifier and Type	Method and Description
abstract long	currentProcessingTime() Returns the current processing time.
abstract long	currentWatermark() Returns the current event-time watermark.
abstract <K,V> ReadOnlyBroadcastState<K,V>	getBroadcastState(MapStateDescriptor<K,V> stateDescriptor) Fetches a read-only view of the broadcast state with the specified name.
abstract <X> void	output(OutputTag<X> outputTag, X value) Emits a record to the side output identified by the OutputTag.
abstract Long	timestamp() Timestamp of the element currently being processed or timestamp of a firing timer.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReadOnlyContext

public ReadOnlyContext()

Method Detail

getBroadcastState

public abstract <K,V> ReadOnlyBroadcastState<K,V> getBroadcastState(MapStateDescriptor<K,V> stateDescriptor)

Fetches a read-only view of the broadcast state with the specified name.

Parameters:

stateDescriptor - the MapStateDescriptor of the state to be fetched.

Returns:

The required read-only view of the broadcast state.

timestamp

public abstract Long timestamp()

Timestamp of the element currently being processed or timestamp of a firing timer.

This might be null, for example if the time characteristic of your program is set to TimeCharacteristic.ProcessingTime.

output

public abstract <X> void output(OutputTag<X> outputTag,
                                X value)

Emits a record to the side output identified by the OutputTag.

Parameters:

outputTag - the OutputTag that identifies the side output to emit to.

value - The record to emit.

currentProcessingTime

public abstract long currentProcessingTime()

Returns the current processing time.

currentWatermark

public abstract long currentWatermark()

Returns the current event-time watermark.