org.apache.flink.cep

接口 PatternSelectFunction<IN,OUT>

类型参数:

IN - Type of the input elements

OUT - Type of the output element

所有超级接口:

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

所有已知实现类:

RichPatternSelectFunction

public interface PatternSelectFunction<IN,OUT>
extends org.apache.flink.api.common.functions.Function, Serializable

Base interface for a pattern select function. A pattern select function is called with a map containing the detected events which can be accessed by their names. The names depend on the definition of the Pattern. The select method returns exactly one result. If you want to return more than one result, then you have to implement a PatternFlatSelectFunction.

 PatternStream<IN> pattern = ...;

 DataStream<OUT> result = pattern.select(new MyPatternSelectFunction());
 

方法概要

限定符和类型	方法和说明
OUT	select(Map<String,List<IN>> pattern) Generates a result from the given map of events.

方法详细资料

select

OUT select(Map<String,List<IN>> pattern)
    throws Exception

Generates a result from the given map of events. The events are identified by their names. Only one resulting element can be generated.

参数:

pattern - Map containing the found pattern. Events are identified by their names

返回:

Resulting element

抛出:

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