org.apache.storm.hbase.topology

Class WordCountValueMapper

java.lang.Object

org.apache.storm.hbase.topology.WordCountValueMapper

All Implemented Interfaces:

Serializable, HBaseValueMapper

public class WordCountValueMapper
extends Object
implements HBaseValueMapper

Takes a Hbase result and returns a value list that has a value instance for each column and corresponding value. So if the result from Hbase was

 WORD, COUNT
 apple, 10
 bannana, 20
 

this will return

     [WORD, apple]
     [COUNT, 10]
     [WORD, banana]
     [COUNT, 20]
 

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
WordCountValueMapper()

Method Summary

Modifier and Type	Method and Description
void	declareOutputFields(OutputFieldsDeclarer declarer) declares the output fields for the lookup bolt.
List<Values>	toValues(ITuple tuple, org.apache.hadoop.hbase.client.Result result) Map to values.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WordCountValueMapper

public WordCountValueMapper()

Method Detail

toValues

public List<Values> toValues(ITuple tuple,
                             org.apache.hadoop.hbase.client.Result result)
                      throws Exception

Description copied from interface: HBaseValueMapper

Map to values.

Specified by:

toValues in interface HBaseValueMapper

Parameters:

tuple - tuple

result - HBase lookup result instance

Returns:

list of values that should be emitted by the lookup bolt

Throws:

Exception

declareOutputFields

public void declareOutputFields(OutputFieldsDeclarer declarer)

Description copied from interface: HBaseValueMapper

declares the output fields for the lookup bolt.

Specified by:

declareOutputFields in interface HBaseValueMapper