PatternSelectFunction (Flink : Libraries : CEP 2.0.0 API)

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

- Method Detail
  - 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.