Package org.apache.flink.datastream.impl.context

Class DefaultStateManager

java.lang.Object

org.apache.flink.datastream.impl.context.DefaultStateManager

All Implemented Interfaces:

org.apache.flink.datastream.api.context.StateManager

public class DefaultStateManager
extends Object
implements org.apache.flink.datastream.api.context.StateManager

The default implementation of StateManager. This class supports eagerly set and reset the current key.

Field Summary

Fields

Modifier and Type	Field	Description
protected org.apache.flink.streaming.api.operators.StreamingRuntimeContext	operatorContext
protected org.apache.flink.api.common.state.OperatorStateStore	operatorStateStore

Constructor Summary

Constructors

Constructor	Description
DefaultStateManager(java.util.function.Supplier<Object> currentKeySupplier, java.util.function.Consumer<Object> currentKeySetter, org.apache.flink.streaming.api.operators.StreamingRuntimeContext operatorContext, org.apache.flink.api.common.state.OperatorStateStore operatorStateStore)

Method Summary

Modifier and Type	Method	Description
void	executeInKeyContext(Runnable runnable, Object key)	This method should be used to run a block of code with a specific key context.
<K> K	getCurrentKey()
<IN,ACC,OUT> Optional<org.apache.flink.api.common.state.AggregatingState<IN,OUT>>	getState(org.apache.flink.api.common.state.AggregatingStateDeclaration<IN,ACC,OUT> stateDeclaration)
<K,V> Optional<org.apache.flink.api.common.state.BroadcastState<K,V>>	getState(org.apache.flink.api.common.state.BroadcastStateDeclaration<K,V> stateDeclaration)
<T> Optional<org.apache.flink.api.common.state.ListState<T>>	getState(org.apache.flink.api.common.state.ListStateDeclaration<T> stateDeclaration)
<K,V> Optional<org.apache.flink.api.common.state.MapState<K,V>>	getState(org.apache.flink.api.common.state.MapStateDeclaration<K,V> stateDeclaration)
<T> Optional<org.apache.flink.api.common.state.ReducingState<T>>	getState(org.apache.flink.api.common.state.ReducingStateDeclaration<T> stateDeclaration)
<T> Optional<org.apache.flink.api.common.state.ValueState<T>>	getState(org.apache.flink.api.common.state.ValueStateDeclaration<T> stateDeclaration)

Methods inherited from class java.lang.Object

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

Field Detail

operatorContext

protected final org.apache.flink.streaming.api.operators.StreamingRuntimeContext operatorContext

operatorStateStore

protected final org.apache.flink.api.common.state.OperatorStateStore operatorStateStore

Constructor Detail

DefaultStateManager

public DefaultStateManager(java.util.function.Supplier<Object> currentKeySupplier,
                           java.util.function.Consumer<Object> currentKeySetter,
                           org.apache.flink.streaming.api.operators.StreamingRuntimeContext operatorContext,
                           org.apache.flink.api.common.state.OperatorStateStore operatorStateStore)

Method Detail

getCurrentKey

public <K> K getCurrentKey()

Specified by:

getCurrentKey in interface org.apache.flink.datastream.api.context.StateManager

getState

public <T> Optional<org.apache.flink.api.common.state.ValueState<T>> getState(org.apache.flink.api.common.state.ValueStateDeclaration<T> stateDeclaration)
                                                                       throws Exception

Specified by:

getState in interface org.apache.flink.datastream.api.context.StateManager

Throws:

Exception

getState

public <T> Optional<org.apache.flink.api.common.state.ListState<T>> getState(org.apache.flink.api.common.state.ListStateDeclaration<T> stateDeclaration)
                                                                      throws Exception

Specified by:

getState in interface org.apache.flink.datastream.api.context.StateManager

Throws:

Exception

getState

public <K,V> Optional<org.apache.flink.api.common.state.MapState<K,V>> getState(org.apache.flink.api.common.state.MapStateDeclaration<K,V> stateDeclaration)
                                                                                     throws Exception

Specified by:

getState in interface org.apache.flink.datastream.api.context.StateManager

Throws:

Exception

getState

public <T> Optional<org.apache.flink.api.common.state.ReducingState<T>> getState(org.apache.flink.api.common.state.ReducingStateDeclaration<T> stateDeclaration)
                                                                          throws Exception

Specified by:

getState in interface org.apache.flink.datastream.api.context.StateManager

Throws:

Exception

getState

public <IN,ACC,OUT> Optional<org.apache.flink.api.common.state.AggregatingState<IN,OUT>> getState(org.apache.flink.api.common.state.AggregatingStateDeclaration<IN,ACC,OUT> stateDeclaration)
                                                                                                             throws Exception

Specified by:

getState in interface org.apache.flink.datastream.api.context.StateManager

Throws:

Exception

getState

public <K,V> Optional<org.apache.flink.api.common.state.BroadcastState<K,V>> getState(org.apache.flink.api.common.state.BroadcastStateDeclaration<K,V> stateDeclaration)
                                                                                           throws Exception

Specified by:

getState in interface org.apache.flink.datastream.api.context.StateManager

Throws:

Exception

executeInKeyContext

public void executeInKeyContext(Runnable runnable,
                                Object key)

This method should be used to run a block of code with a specific key context. The original key must be reset after the block is executed.