org.apache.flink.contrib.streaming.state

Class RocksDBReducingState<K,N,V>

java.lang.Object

org.apache.flink.contrib.streaming.state.AbstractRocksDBState<K,N,org.apache.flink.api.common.state.ReducingState<V>,org.apache.flink.api.common.state.ReducingStateDescriptor<V>>

org.apache.flink.contrib.streaming.state.RocksDBReducingState<K,N,V>

Type Parameters:

K - The type of the key.

N - The type of the namespace.

V - The type of value that the state state stores.

All Implemented Interfaces:

org.apache.flink.api.common.state.AppendingState<V,V>, org.apache.flink.api.common.state.MergingState<V,V>, org.apache.flink.api.common.state.ReducingState<V>, org.apache.flink.api.common.state.State, org.apache.flink.runtime.state.KvState<K,N,org.apache.flink.api.common.state.ReducingState<V>,org.apache.flink.api.common.state.ReducingStateDescriptor<V>,RocksDBStateBackend>

public class RocksDBReducingState<K,N,V>
extends AbstractRocksDBState<K,N,org.apache.flink.api.common.state.ReducingState<V>,org.apache.flink.api.common.state.ReducingStateDescriptor<V>>
implements org.apache.flink.api.common.state.ReducingState<V>

ReducingState implementation that stores state in RocksDB.

Field Summary

Fields inherited from class org.apache.flink.contrib.streaming.state.AbstractRocksDBState

backend, columnFamily

Constructor Summary

Constructors

Constructor and Description
RocksDBReducingState(org.rocksdb.ColumnFamilyHandle columnFamily, org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer, org.apache.flink.api.common.state.ReducingStateDescriptor<V> stateDesc, RocksDBStateBackend backend) Creates a new RocksDBReducingState.

Method Summary

Modifier and Type	Method and Description
void	add(V value)
V	get()

Methods inherited from class org.apache.flink.contrib.streaming.state.AbstractRocksDBState

clear, dispose, setCurrentKey, setCurrentNamespace, snapshot, writeKeyAndNamespace

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.common.state.State

clear

Constructor Detail

RocksDBReducingState

public RocksDBReducingState(org.rocksdb.ColumnFamilyHandle columnFamily,
                            org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer,
                            org.apache.flink.api.common.state.ReducingStateDescriptor<V> stateDesc,
                            RocksDBStateBackend backend)

Creates a new RocksDBReducingState.

Parameters:

namespaceSerializer - The serializer for the namespace.

stateDesc - The state identifier for the state. This contains name and can create a default state value.

Method Detail

get

public V get()

Specified by:

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

add

public void add(V value)
         throws IOException

Specified by:

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

Throws:

IOException