com.stratio.deep.cql

Class DeepRecordReader

java.lang.Object

com.stratio.deep.cql.DeepRecordReader

public class DeepRecordReader
extends Object

Implements a cassandra record reader with pagination capabilities. Does not rely on Cassandra's Hadoop CqlPagingRecordReader.

Author:

Luca Rosellini

Constructor Summary

Constructors

Constructor and Description
DeepRecordReader(IDeepJobConfig config, DeepTokenRange split) public constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Closes this input reader object.
Map<String,ByteBuffer>	createKey() Creates a new key map.
Map<String,ByteBuffer>	createValue() Creates a new value map.
boolean	hasNext() Returns a boolean indicating if the underlying rowIterator has a new element or not.
Pair<Map<String,ByteBuffer>,Map<String,ByteBuffer>>	next() Returns the next element in the underlying rowIterator.

Methods inherited from class java.lang.Object

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

Constructor Detail

DeepRecordReader

public DeepRecordReader(IDeepJobConfig config,
                DeepTokenRange split)

public constructor. Takes a list of filters to pass to the underlying data stores.

Parameters:

config - the deep configuration object.

split - the token range on which the new reader will be based.

Method Detail

close

public void close()

Closes this input reader object.

createKey

public Map<String,ByteBuffer> createKey()

Creates a new key map.

Returns:

the map of associations between row key names and their values.

createValue

public Map<String,ByteBuffer> createValue()

Creates a new value map.

Returns:

the map of associations between row column names and their values.

hasNext

public boolean hasNext()

Returns a boolean indicating if the underlying rowIterator has a new element or not. DOES NOT advance the iterator to the next element.

Returns:

a boolean indicating if the underlying rowIterator has a new element or not.

next

public Pair<Map<String,ByteBuffer>,Map<String,ByteBuffer>> next()

Returns the next element in the underlying rowIterator.

Returns:

the next element in the underlying rowIterator.