CrossFunction (Flink : 2.0-SNAPSHOT API)

Type Parameters:

IN1 - The type of the elements in the first input.

IN2 - The type of the elements in the second input.

OUT - The type of the result elements.

All Superinterfaces:

Function, Serializable

All Known Implementing Classes:

RichCrossFunction

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@Public
@FunctionalInterface
public interface CrossFunction<IN1,IN2,OUT>
extends Function, Serializable
```
Interface for Cross functions. Cross functions are applied to the Cartesian product of their inputs and are called for each pair of elements.
They are optional, a means of convenience that can be used to directly manipulate the pair of elements instead of producing 2-tuples containing the pairs.
The basic syntax for using Cross on two data sets is as follows:
```
 DataSet<X> set1 = ...;
 DataSet<Y> set2 = ...;

 set1.cross(set2).with(new MyCrossFunction());
 
```
set1 is here considered the first input, set2 the second input.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  OUT cross(IN1 val1, IN2 val2)
  Cross UDF method.

- Method Detail
  - cross
```
OUT cross(IN1 val1,
          IN2 val2)
   throws Exception
```
    Cross UDF method. Called once per pair of elements in the Cartesian product of the inputs.
    
    Parameters:
    
    val1 - Element from first input.
    
    val2 - Element from the second input.
    
    Returns:
    
    The result element.
    
    Throws:
    
    Exception - The function may throw Exceptions, which will cause the program to cancel, and may trigger the recovery logic.