Class FlatMapOperator<R,T>
- java.lang.Object
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- org.apache.heron.api.topology.BaseComponent
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- org.apache.heron.api.bolt.BaseRichBolt
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- org.apache.heron.streamlet.impl.operators.StreamletOperator<R,T>
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- org.apache.heron.streamlet.impl.operators.FlatMapOperator<R,T>
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- All Implemented Interfaces:
Serializable
,IBolt
,IRichBolt
,IComponent
,IStreamletOperator<R,T>
,IStreamletRichOperator<R,T>
public class FlatMapOperator<R,T> extends StreamletOperator<R,T>
FlatMapOperator is the class that implements the flatMap functionality. It takes in the flatMapFunction Function as the input. For every tuple, it applies the flatMapFunction, flattens the resulting tuples and emits them- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class org.apache.heron.streamlet.impl.operators.StreamletOperator
collector, OUTPUT_FIELD_NAME
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Constructor Summary
Constructors Constructor Description FlatMapOperator(SerializableFunction<? super R,? extends Iterable<? extends T>> flatMapFn)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
execute(Tuple tuple)
Process a single tuple of input.-
Methods inherited from class org.apache.heron.streamlet.impl.operators.StreamletOperator
declareOutputFields, prepare
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Methods inherited from class org.apache.heron.api.bolt.BaseRichBolt
cleanup
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Methods inherited from class org.apache.heron.api.topology.BaseComponent
getComponentConfiguration
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.apache.heron.api.topology.IComponent
getComponentConfiguration
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Constructor Detail
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FlatMapOperator
public FlatMapOperator(SerializableFunction<? super R,? extends Iterable<? extends T>> flatMapFn)
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Method Detail
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execute
public void execute(Tuple tuple)
Description copied from interface:IBolt
Process a single tuple of input. The Tuple object contains metadata on it about which component/stream/task it came from. The values of the Tuple can be accessed using Tuple#getValue. The IBolt does not have to process the Tuple immediately. It is perfectly fine to hang onto a tuple and process it later (for instance, to do an aggregation or join).Tuples should be emitted using the OutputCollector provided through the prepare method. It is required that all input tuples are acked or failed at some point using the OutputCollector. Otherwise, Heron will be unable to determine when tuples coming off the spouts have been completed.
For the common case of acking an input tuple at the end of the execute method, see IBasicBolt which automates this.
- Parameters:
tuple
- The input tuple to be processed.
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