org.apache.flink.cep

Interface PatternFlatSelectFunction<IN,OUT>

Type Parameters:

IN -

OUT -

All Superinterfaces:

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

All Known Implementing Classes:

RichPatternFlatSelectFunction

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

Base interface for a pattern select function which can produce multiple resulting elements. A pattern flat select function is called with a map of detected events which are identified by their names. The names are defined by the Pattern specifying the sought-after pattern. Additionally, a collector is provided as a parameter. The collector is used to emit an arbitrary number of resulting elements.

 PatternStream<IN> pattern = ...

 DataStream<OUT> result = pattern.flatSelect(new MyPatternFlatSelectFunction());
 

Method Summary

Modifier and Type	Method and Description
void	flatSelect(Map<String,List<IN>> pattern, org.apache.flink.util.Collector<OUT> out) Generates zero or more resulting elements given a map of detected pattern events.

Method Detail

flatSelect

void flatSelect(Map<String,List<IN>> pattern,
                org.apache.flink.util.Collector<OUT> out)
         throws Exception

Generates zero or more resulting elements given a map of detected pattern events. The events are identified by their specified names.

Parameters:

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

out - Collector used to output the generated elements

Throws:

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