org.apache.flink.contrib.streaming.state

Class RocksDBFoldingState<K,N,T,ACC>

java.lang.Object

org.apache.flink.contrib.streaming.state.AbstractRocksDBState<K,N,org.apache.flink.api.common.state.FoldingState<T,ACC>,org.apache.flink.api.common.state.FoldingStateDescriptor<T,ACC>>

org.apache.flink.contrib.streaming.state.RocksDBFoldingState<K,N,T,ACC>

Type Parameters:

K - The type of the key.

N - The type of the namespace.

T - The type of the values that can be folded into the state.

ACC - The type of the value in the folding state.

All Implemented Interfaces:

org.apache.flink.api.common.state.AppendingState<T,ACC>, org.apache.flink.api.common.state.FoldingState<T,ACC>, org.apache.flink.api.common.state.State, org.apache.flink.runtime.state.KvState<K,N,org.apache.flink.api.common.state.FoldingState<T,ACC>,org.apache.flink.api.common.state.FoldingStateDescriptor<T,ACC>,RocksDBStateBackend>

public class RocksDBFoldingState<K,N,T,ACC>
extends AbstractRocksDBState<K,N,org.apache.flink.api.common.state.FoldingState<T,ACC>,org.apache.flink.api.common.state.FoldingStateDescriptor<T,ACC>>
implements org.apache.flink.api.common.state.FoldingState<T,ACC>

FoldingState 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
RocksDBFoldingState(org.rocksdb.ColumnFamilyHandle columnFamily, org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer, org.apache.flink.api.common.state.FoldingStateDescriptor<T,ACC> stateDesc, RocksDBStateBackend backend) Creates a new RocksDBFoldingState.

Method Summary

Modifier and Type	Method and Description
void	add(T value)
ACC	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

RocksDBFoldingState

public RocksDBFoldingState(org.rocksdb.ColumnFamilyHandle columnFamily,
                           org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer,
                           org.apache.flink.api.common.state.FoldingStateDescriptor<T,ACC> stateDesc,
                           RocksDBStateBackend backend)

Creates a new RocksDBFoldingState.

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 ACC get()

Specified by:

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

add

public void add(T value)
         throws IOException

Specified by:

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

Throws:

IOException