Class SplitOperator<R>
- 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,R>
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- org.apache.heron.streamlet.impl.operators.SplitOperator<R>
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- All Implemented Interfaces:
Serializable
,IBolt
,IRichBolt
,IComponent
,IStreamletOperator<R,R>
,IStreamletRichOperator<R,R>
public class SplitOperator<R> extends StreamletOperator<R,R>
SplitOperator is the class that implements the split functionality. It takes in the split function as the input and use it to process tuples and get the output stream id and emit to the specific streams. Note that one tuple can be emitted to multiple or zero streams.- 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 SplitOperator(Map<String,SerializablePredicate<R>> splitFns)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
declareOutputFields(OutputFieldsDeclarer declarer)
The operators implementing streamlet functionality have some properties.void
execute(Tuple tuple)
Process a single tuple of input.-
Methods inherited from class org.apache.heron.streamlet.impl.operators.StreamletOperator
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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SplitOperator
public SplitOperator(Map<String,SerializablePredicate<R>> splitFns)
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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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declareOutputFields
public void declareOutputFields(OutputFieldsDeclarer declarer)
Description copied from class:StreamletOperator
The operators implementing streamlet functionality have some properties. 1. They all output only one stream 2. They should be able to consume each other's output This imply that the output stream should be named same for all of them.- Specified by:
declareOutputFields
in interfaceIComponent
- Overrides:
declareOutputFields
in classStreamletOperator<R,R>
- Parameters:
declarer
- this is used to declare output stream ids, output fields, and whether or not each output stream is a direct stream
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