org.apache.flink.streaming.api.operators.util

Class SimpleVersionedListState<T>

java.lang.Object

org.apache.flink.streaming.api.operators.util.SimpleVersionedListState<T>

Type Parameters:

T - The type of the objects stored in the state.

All Implemented Interfaces:

org.apache.flink.api.common.state.AppendingState<T,Iterable<T>>, org.apache.flink.api.common.state.ListState<T>, org.apache.flink.api.common.state.MergingState<T,Iterable<T>>, org.apache.flink.api.common.state.State

public class SimpleVersionedListState<T>
extends Object
implements org.apache.flink.api.common.state.ListState<T>

A ListState that uses a SimpleVersionedSerializer instead of a TypeSerializer.

The state wraps a ListState of type byte[], meaning it internally keeps only bytes and lazily deserializes them into objects. This has two major implications, compared to a ListState states that uses a TypeSerializer:

• This state does not participate in >state migration. The bytes are never converted and different state versions are lazily resolved by the versioned serializer.
• This state is generally slower than states that directly use the TypeSerializer, because of extra copies into byte arrays and extra version encodings.

Constructor Summary

Constructors

Constructor and Description
SimpleVersionedListState(org.apache.flink.api.common.state.ListState<byte[]> rawState, org.apache.flink.core.io.SimpleVersionedSerializer<T> serializer) Creates a new SimpleVersionedListState that reads and writes bytes from the given raw ListState with the given serializer.

Method Summary

Modifier and Type	Method and Description
void	add(T value)
void	addAll(List<T> values)
void	clear()
Iterable<T>	get()
void	update(List<T> values)

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleVersionedListState

public SimpleVersionedListState(org.apache.flink.api.common.state.ListState<byte[]> rawState,
                                org.apache.flink.core.io.SimpleVersionedSerializer<T> serializer)

Creates a new SimpleVersionedListState that reads and writes bytes from the given raw ListState with the given serializer.

Method Detail

update

public void update(@Nullable
                   List<T> values)
            throws Exception

Specified by:

update in interface org.apache.flink.api.common.state.ListState<T>

Throws:

Exception

addAll

public void addAll(@Nullable
                   List<T> values)
            throws Exception

Specified by:

addAll in interface org.apache.flink.api.common.state.ListState<T>

Throws:

Exception

get

public Iterable<T> get()
                throws Exception

Specified by:

get in interface org.apache.flink.api.common.state.AppendingState<T,Iterable<T>>

Throws:

Exception

add

public void add(T value)
         throws Exception

Specified by:

add in interface org.apache.flink.api.common.state.AppendingState<T,Iterable<T>>

Throws:

Exception

clear

public void clear()

Specified by:

clear in interface org.apache.flink.api.common.state.State