Package org.apache.flink.cep

Interface PatternSelectFunction<IN,OUT>

Type Parameters:
IN - Type of the input elements
OUT - Type of the output element
All Superinterfaces:
org.apache.flink.api.common.functions.Function, Serializable
All Known Implementing Classes:
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());

  • Method Summary

    Modifier and Type
    Method
    Description
    OUT
    select(Map<String,List<IN>> pattern)
    Generates a result from the given map of events.

  • Method Details

    • 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.
      Parameters:
      pattern - Map containing the found pattern. Events are identified by their names
      Returns:
      Resulting element
      Throws:
      Exception - This method may throw exceptions. Throwing an exception will cause the operation to fail and may trigger recovery.