package org.apache.storm.hdfs.bolt.format;
import backtype.storm.tuple.Tuple;
import org.apache.hadoop.io.Writable;
import java.io.Serializable;
/**
* Interface for converting <code>Tuple</code> objects to HDFS sequence file key-value pairs.
*
*/
public interface SequenceFormat extends Serializable {
/**
* Key class used by implementation (e.g. IntWritable.class, etc.)
*
* @return
*/
Class keyClass();
/**
* Value class used by implementation (e.g. Text.class, etc.)
* @return
*/
Class valueClass();
/**
* Given a tuple, return the key that should be written to the sequence file.
*
* @param tuple
* @return
*/
Writable key(Tuple tuple);
/**
* Given a tuple, return the value that should be written to the sequence file.
* @param tuple
* @return
*/
Writable value(Tuple tuple);
}