org.apache.flink.contrib.streaming.state

Class RocksDBListState<K,N,V>

java.lang.Object

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

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

Type Parameters:

K - The type of the key.

N - The type of the namespace.

V - The type of the values in the list state.

All Implemented Interfaces:

org.apache.flink.api.common.state.AppendingState<V,Iterable<V>>, org.apache.flink.api.common.state.ListState<V>, org.apache.flink.api.common.state.MergingState<V,Iterable<V>>, org.apache.flink.api.common.state.State, org.apache.flink.runtime.state.KvState<K,N,org.apache.flink.api.common.state.ListState<V>,org.apache.flink.api.common.state.ListStateDescriptor<V>,RocksDBStateBackend>

public class RocksDBListState<K,N,V>
extends AbstractRocksDBState<K,N,org.apache.flink.api.common.state.ListState<V>,org.apache.flink.api.common.state.ListStateDescriptor<V>>
implements org.apache.flink.api.common.state.ListState<V>

ListState implementation that stores state in RocksDB.

RocksDBStateBackend must ensure that we set the StringAppendOperator on the column family that we use for our state since we use the merge() call.

Field Summary

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

backend, columnFamily

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	add(V value)
Iterable<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

RocksDBListState

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

Creates a new RocksDBListState.

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 Iterable<V> get()

Specified by:

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

add

public void add(V value)
         throws IOException

Specified by:

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

Throws:

IOException