org.apache.flink.datastream.api.context

接口 StateManager

@Experimental
public interface StateManager

This is responsibility for managing runtime information related to state of process function.

方法概要

限定符和类型	方法和说明
<K> K	getCurrentKey() Get the key of current record.
<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) Get the specific aggregating state.
<K,V> Optional<org.apache.flink.api.common.state.BroadcastState<K,V>>	getState(org.apache.flink.api.common.state.BroadcastStateDeclaration<K,V> stateDeclaration) Get the specific broadcast state.
<T> Optional<org.apache.flink.api.common.state.ListState<T>>	getState(org.apache.flink.api.common.state.ListStateDeclaration<T> stateDeclaration) Get the specific list state.
<K,V> Optional<org.apache.flink.api.common.state.MapState<K,V>>	getState(org.apache.flink.api.common.state.MapStateDeclaration<K,V> stateDeclaration) Get the specific map state.
<T> Optional<org.apache.flink.api.common.state.ReducingState<T>>	getState(org.apache.flink.api.common.state.ReducingStateDeclaration<T> stateDeclaration) Get the specific reducing state.
<T> Optional<org.apache.flink.api.common.state.ValueState<T>>	getState(org.apache.flink.api.common.state.ValueStateDeclaration<T> stateDeclaration) Get the specific value state.

方法详细资料

getCurrentKey

<K> K getCurrentKey()
             throws UnsupportedOperationException

Get the key of current record.

返回:

The key of current processed record.

抛出:

UnsupportedOperationException - if the key can not be extracted for this function, for instance, get the key from a non-keyed partition stream.

getState

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

Get the specific list state.

参数:

stateDeclaration - of this state.

返回:

the list state corresponds to the state declaration.

抛出:

Exception

getState

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

Get the specific value state.

参数:

stateDeclaration - of this state.

返回:

the value state corresponds to the state declaration.

抛出:

Exception

getState

<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

Get the specific map state.

参数:

stateDeclaration - of this state.

返回:

the map state corresponds to the state declaration.

抛出:

Exception

getState

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

Get the specific reducing state.

参数:

stateDeclaration - of this state.

返回:

the reducing state corresponds to the state declaration.

抛出:

Exception

getState

<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

Get the specific aggregating state.

参数:

stateDeclaration - of this state.

返回:

the aggregating state corresponds to the state declaration.

抛出:

Exception

getState

<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

Get the specific broadcast state.

参数:

stateDeclaration - of this state.

返回:

the broadcast state corresponds to the state declaration.

抛出:

Exception