Package 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
    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 Details

    • 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.