Class BulkIterationBase.TerminationCriterionMapper<X>
- java.lang.Object
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- org.apache.flink.api.common.functions.AbstractRichFunction
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- org.apache.flink.api.common.operators.base.BulkIterationBase.TerminationCriterionMapper<X>
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- 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
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Constructor Summary
Constructors Constructor Description TerminationCriterionMapper()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
flatMap(X in, Collector<X> 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
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Method Detail
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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 interfaceRichFunction
- Overrides:
open
in classAbstractRichFunction
- Parameters:
openContext
- The context containing information about the context in which the function is opened.
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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 interfaceFlatMapFunction<X,X>
- Parameters:
in
- The input value.out
- The collector for returning result values.
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