brickhouse.udf.bloom
Class BloomFactory

java.lang.Object
  brickhouse.udf.bloom.BloomFactory

public class BloomFactory
extends Object

Utility class for construction and serialization of BloomFilters ...

Field Summary

static double	DEFAULT_FALSE_POS_PROB
static int	DEFAULT_HASH_TYPE
static int	DEFAULT_NUM_ELEMENTS
static int	NUMBER_OF_BLOOMS

Constructor Summary

BloomFactory()

Method Summary

static org.apache.hadoop.util.bloom.Filter	GetBloomFilter(String str) Generic method for getting BloomFilter from a string.
static org.apache.hadoop.util.bloom.Filter	GetNamedBloomFilter(String name)
static org.apache.hadoop.util.bloom.Filter	NewBloomInstance()
static org.apache.hadoop.util.bloom.Filter	NewBloomInstance(double c, int n, int k)
static org.apache.hadoop.util.bloom.Filter	NewBloomInstance(int expectedNumberOfElements, double falsePositiveProbability)
static void	PutNamedBloomFilter(String name, org.apache.hadoop.util.bloom.Filter bloom)
static org.apache.hadoop.util.bloom.Filter	ReadBloomFromStream(InputStream stream)
static org.apache.hadoop.util.bloom.Filter	ReadBloomFromString(String str)
static void	WriteBloomToStream(OutputStream stream, org.apache.hadoop.util.bloom.Filter bloom)
static String	WriteBloomToString(org.apache.hadoop.util.bloom.Filter bloom)

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_NUM_ELEMENTS

public static final int DEFAULT_NUM_ELEMENTS

See Also:

Constant Field Values

DEFAULT_FALSE_POS_PROB

public static final double DEFAULT_FALSE_POS_PROB

See Also:

Constant Field Values

DEFAULT_HASH_TYPE

public static final int DEFAULT_HASH_TYPE

See Also:

Constant Field Values

NUMBER_OF_BLOOMS

public static final int NUMBER_OF_BLOOMS

See Also:

Constant Field Values

Constructor Detail

BloomFactory

public BloomFactory()

Method Detail

NewBloomInstance

public static org.apache.hadoop.util.bloom.Filter NewBloomInstance()

NewBloomInstance

public static org.apache.hadoop.util.bloom.Filter NewBloomInstance(int expectedNumberOfElements,
                                                                   double falsePositiveProbability)

NewBloomInstance

public static org.apache.hadoop.util.bloom.Filter NewBloomInstance(double c,
                                                                   int n,
                                                                   int k)

GetBloomFilter

public static org.apache.hadoop.util.bloom.Filter GetBloomFilter(String str)

Generic method for getting BloomFilter from a string. First, the local map is checked for a bloom loaded from the distributed cache. Next the bloom is attempted to be parsed from UUencoded format.

Parameters:

name -

Returns:

GetNamedBloomFilter

public static org.apache.hadoop.util.bloom.Filter GetNamedBloomFilter(String name)

PutNamedBloomFilter

public static void PutNamedBloomFilter(String name,
                                       org.apache.hadoop.util.bloom.Filter bloom)

ReadBloomFromStream

public static org.apache.hadoop.util.bloom.Filter ReadBloomFromStream(InputStream stream)
                                                               throws IOException

Throws:

IOException

WriteBloomToStream

public static void WriteBloomToStream(OutputStream stream,
                                      org.apache.hadoop.util.bloom.Filter bloom)
                               throws IOException

Throws:

IOException

ReadBloomFromString

public static org.apache.hadoop.util.bloom.Filter ReadBloomFromString(String str)
                                                               throws IOException

Throws:

IOException

WriteBloomToString

public static String WriteBloomToString(org.apache.hadoop.util.bloom.Filter bloom)
                                 throws IOException

Throws:

IOException