Package org.apache.storm.flux.examples
Class WordCounter
java.lang.Object
org.apache.storm.topology.base.BaseComponent
org.apache.storm.topology.base.BaseBasicBolt
org.apache.storm.flux.examples.WordCounter
- All Implemented Interfaces:
Serializable,IBasicBolt,IComponent
This bolt is used by the HBase example. It simply emits the first field
found in the incoming tuple as "word", with a "count" of `1`.
In this case, the downstream HBase bolt handles the counting, so a value
of `1` will just increment the HBase counter by one.
- See Also:
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoidcleanup()voiddeclareOutputFields(OutputFieldsDeclarer declarer) Declare the output schema for all the streams of this topology.voidexecute(Tuple input, BasicOutputCollector collector) Process the input tuple and optionally emit new tuples based on the input tuple.Declare configuration specific to this component.voidprepare(Map<String, Object> topoConf, TopologyContext context)
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Constructor Details
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WordCounter
public WordCounter()
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Method Details
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prepare
- Specified by:
preparein interfaceIBasicBolt- Overrides:
preparein classBaseBasicBolt
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execute
Description copied from interface:IBasicBoltProcess the input tuple and optionally emit new tuples based on the input tuple.All acking is managed for you. Throw a FailedException if you want to fail the tuple.
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cleanup
public void cleanup()- Specified by:
cleanupin interfaceIBasicBolt- Overrides:
cleanupin classBaseBasicBolt
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declareOutputFields
Description copied from interface:IComponentDeclare the output schema for all the streams of this topology.- 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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getComponentConfiguration
Description copied from interface:IComponentDeclare configuration specific to this component. Only a subset of the "topology.*" configs can be overridden. The component configuration can be further overridden when constructing the topology usingTopologyBuilder- Specified by:
getComponentConfigurationin interfaceIComponent- Overrides:
getComponentConfigurationin classBaseComponent
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