org.apache.flink.state.api.functions

类 KeyedStateBootstrapFunction<K,IN>

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.state.api.functions.KeyedStateBootstrapFunction<K,IN>

类型参数:

K - Type of the keys.

IN - Type of the input.

所有已实现的接口:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.RichFunction

@PublicEvolving
public abstract class KeyedStateBootstrapFunction<K,IN>
extends org.apache.flink.api.common.functions.AbstractRichFunction

A function that writes keyed state to a new operator.

For every element processElement(Object, Context) is invoked. This can write data to state and set timers.

NOTE: A KeyedStateBootstrapFunction is always a RichFunction. Therefore, access to the RuntimeContext is always available and setup and teardown methods can be implemented. See RichFunction.open(Configuration))} and RichFunction.close().

另请参阅:

序列化表格

嵌套类概要

嵌套类

限定符和类型	类和说明
class	KeyedStateBootstrapFunction.Context Information available in an invocation of processElement(Object, Context).

构造器概要

构造器

构造器和说明
KeyedStateBootstrapFunction()

方法概要

限定符和类型	方法和说明
abstract void	processElement(IN value, KeyedStateBootstrapFunction.Context ctx) Process one element from the input stream.

从类继承的方法 org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

从类继承的方法 java.lang.Object

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

构造器详细资料

KeyedStateBootstrapFunction

public KeyedStateBootstrapFunction()

方法详细资料

processElement

public abstract void processElement(IN value,
                                    KeyedStateBootstrapFunction.Context ctx)
                             throws Exception

Process one element from the input stream.

This function can update internal state or set timers using the KeyedStateBootstrapFunction.Context parameter.

参数:

value - The input value.

ctx - A KeyedStateBootstrapFunction.Context that allows querying the timestamp of the element and getting a TimerService for registering timers and querying the time. The context is only valid during the invocation of this method, do not store it.

抛出:

Exception - This method may throw exceptions. Throwing an exception will cause the operation to fail and may trigger recovery.