org.apache.flink.api.common.operators.base

Class BulkIterationBase.TerminationCriterionMapper<X>

java.lang.Object

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

org.apache.flink.api.common.operators.base.BulkIterationBase.TerminationCriterionMapper<X>

All Implemented Interfaces:

Serializable, FlatMapFunction<X,X>, Function, RichFunction

Enclosing class:

BulkIterationBase<T>

public static class BulkIterationBase.TerminationCriterionMapper<X>
extends AbstractRichFunction
implements FlatMapFunction<X,X>

Special Mapper that is added before a termination criterion and is only a container for an special aggregator

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TerminationCriterionMapper()

Method Summary

Modifier and Type	Method and Description
void	flatMap(X in, Collector<X> out) The core method of the FlatMapFunction.
void	open(Configuration parameters) 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

Constructor Detail

TerminationCriterionMapper

public TerminationCriterionMapper()

Method Detail

open

public void open(Configuration parameters)

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 configuration object passed to the function can be used for configuration and initialization. The configuration contains all parameters that were configured on the function in the program composition.

 public class MyMapper extends FilterFunction<String> {
 
     private String searchString;
     
     public void open(Configuration parameters) {
         this.searchString = parameters.getString("foo");
     }
     
     public boolean filter(String value) {
         return value.equals(searchString);
     }
 }
 

By default, this method does nothing.

Specified by:

open in interface RichFunction

Overrides:

open in class AbstractRichFunction

Parameters:

parameters - The configuration containing the parameters attached to the contract.

See Also:

Configuration

flatMap

public void flatMap(X in,
                    Collector<X> out)

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<X,X>

Parameters:

in - The input value.

out - The collector for returning result values.