Package org.apache.flink.streaming.tests

Class SlidingWindowCheckMapper

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.api.common.functions.RichFlatMapFunction<Tuple2<Integer,List<Event>>,String>

org.apache.flink.streaming.tests.SlidingWindowCheckMapper

All Implemented Interfaces:

Serializable, FlatMapFunction<Tuple2<Integer,List<Event>>,String>, Function, RichFunction

public class SlidingWindowCheckMapper
extends RichFlatMapFunction<Tuple2<Integer,List<Event>>,String>

This mapper validates sliding event time window. It checks each event belongs to appropriate number of consecutive windows.

See Also:

Serialized Form

Method Summary

Modifier and Type	Method	Description
void	flatMap(Tuple2<Integer,List<Event>> value, Collector<String> out)	The core method of the FlatMapFunction.
void	open(OpenContext openContext)	Initialization method for the function.

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, setRuntimeContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

open

public void open(OpenContext openContext)

Description copied from interface: RichFunction

Initialization method for the function. It is called before the actual working methods (like map or join) and thus suitable for one time setup work. For functions that are part of an iteration, this method will be invoked at the beginning of each iteration superstep.

The openContext object passed to the function can be used for configuration and initialization. The openContext contains some necessary information that were configured on the function in the program composition.

 public class MyFilter extends RichFilterFunction<String> {

     private String searchString;

     public void open(OpenContext openContext) {
         // initialize the value of searchString
     }

     public boolean filter(String value) {
         return value.equals(searchString);
     }
 }
 

Specified by:

open in interface RichFunction

Overrides:

open in class AbstractRichFunction

Parameters:

openContext - The context containing information about the context in which the function is opened.

flatMap

public void flatMap(Tuple2<Integer,List<Event>> value,
                    Collector<String> out)
             throws Exception

Description copied from interface: FlatMapFunction

The core method of the FlatMapFunction. Takes an element from the input data set and transforms it into zero, one, or more elements.

Specified by:

flatMap in interface FlatMapFunction<Tuple2<Integer,List<Event>>,String>

Specified by:

flatMap in class RichFlatMapFunction<Tuple2<Integer,List<Event>>,String>

Parameters:

value - The input value.

out - The collector for returning result values.

Throws:

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