CopyOnWriteStateTable (Flink : Runtime 2.0.0 API)

java.lang.Object
- org.apache.flink.runtime.state.heap.StateTable<K,N,S>
- - org.apache.flink.runtime.state.heap.CopyOnWriteStateTable<K,N,S>

Type Parameters:

K - type of key.

N - type of namespace.

S - type of state.

All Implemented Interfaces:

Iterable<StateEntry<K,N,S>>, StateSnapshotRestore
```
public class CopyOnWriteStateTable<K,N,S>
extends StateTable<K,N,S>
```
This implementation of StateTable uses CopyOnWriteStateMap. This implementation supports asynchronous snapshots.

Field Summary
- Fields inherited from class org.apache.flink.runtime.state.heap.StateTable
  keyContext, keyGroupedStateMaps, keyGroupRange, keySerializer, metaInfo

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected CopyOnWriteStateMap<K,N,S>`	`createStateMap()`
`void`	`setMetaInfo(RegisteredKeyValueStateBackendMetaInfo<N,S> metaInfo)`
`CopyOnWriteStateTableSnapshot<K,N,S>`	`stateSnapshot()`	Creates a snapshot of this `CopyOnWriteStateTable`, to be written in checkpointing.

Methods inherited from class org.apache.flink.runtime.state.heap.StateTable
containsKey, get, get, getKeyGroupOffset, getKeys, getKeysAndNamespaces, getKeySerializer, getMapForKeyGroup, getMetaInfo, getNamespaceSerializer, getState, getStateIncrementalVisitor, getStateSerializer, isEmpty, iterator, keyGroupReader, put, put, remove, removeAndGetOld, size, sizeOfNamespace, transform

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable
forEach, spliterator

- Method Detail
  - createStateMap
```
protected CopyOnWriteStateMap<K,N,S> createStateMap()
```
    Specified by:
    
    createStateMap in class StateTable<K,N,S>
  - setMetaInfo
```
public void setMetaInfo(RegisteredKeyValueStateBackendMetaInfo<N,S> metaInfo)
```
    Overrides:
    
    setMetaInfo in class StateTable<K,N,S>
  - stateSnapshot
```
@Nonnull
public CopyOnWriteStateTableSnapshot<K,N,S> stateSnapshot()
```
    Creates a snapshot of this CopyOnWriteStateTable, to be written in checkpointing.
    
    Specified by:
    
    stateSnapshot in interface StateSnapshotRestore
    
    Specified by:
    
    stateSnapshot in class StateTable<K,N,S>
    
    Returns:
    
    a snapshot from this CopyOnWriteStateTable, for checkpointing.