org.apache.druid.query.groupby.epinephelinae

Class ByteBufferHashTable

java.lang.Object

org.apache.druid.query.groupby.epinephelinae.ByteBufferHashTable

public class ByteBufferHashTable
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ByteBufferHashTable.BucketUpdateHandler

Field Summary

Fields

Modifier and Type	Field and Description
protected int	bucketSizeWithHash
protected ByteBufferHashTable.BucketUpdateHandler	bucketUpdateHandler
protected ByteBuffer	buffer
protected int	growthCount
protected static int	HASH_SIZE
protected int	initialBuckets
protected int	keySize
protected int	maxBuckets
protected float	maxLoadFactor
protected int	maxSizeForTesting
protected int	regrowthThreshold
protected int	size
protected int	tableArenaSize
protected ByteBuffer	tableBuffer
protected int	tableStart

Constructor Summary

Constructors

Constructor and Description
ByteBufferHashTable(float maxLoadFactor, int initialBuckets, int bucketSizeWithHash, ByteBuffer buffer, int keySize, int maxSizeForTesting, ByteBufferHashTable.BucketUpdateHandler bucketUpdateHandler)

Method Summary

Modifier and Type	Method and Description
void	adjustTableWhenFull()
static int	calculateTableArenaSizeWithFixedAdditionalSize(int bufferCapacity, int bucketSize, int fixedAdditionalSize)
static int	calculateTableArenaSizeWithPerBucketAdditionalSize(int bufferCapacity, int bucketSize, int perBucketAdditionalSize)
protected boolean	canAllowNewBucket()
protected int	findBucket(boolean allowNewBucket, int buckets, ByteBuffer targetTableBuffer, ByteBuffer keyBuffer, int keyHash) Finds the bucket into which we should insert a key.
protected int	findBucketWithAutoGrowth(ByteBuffer keyBuffer, int keyHash) Find a bucket for a key, attempting to resize the table with adjustTableWhenFull() if possible.
int	getGrowthCount()
int	getMaxBuckets()
protected int	getOffsetForBucket(int bucket)
int	getRegrowthThreshold()
int	getSize()
ByteBuffer	getTableBuffer()
protected void	initializeNewBucketKey(int bucket, ByteBuffer keyBuffer, int keyHash)
protected boolean	isBucketUsed(int bucket)
protected boolean	isOffsetUsed(int bucketOffset)
protected int	maxSizeForBuckets(int buckets)
void	reset()

Methods inherited from class java.lang.Object

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

Field Detail

maxSizeForTesting

protected final int maxSizeForTesting

HASH_SIZE

protected static final int HASH_SIZE

See Also:

Constant Field Values

maxLoadFactor

protected final float maxLoadFactor

initialBuckets

protected final int initialBuckets

buffer

protected final ByteBuffer buffer

bucketSizeWithHash

protected final int bucketSizeWithHash

tableArenaSize

protected final int tableArenaSize

keySize

protected final int keySize

tableStart

protected int tableStart

tableBuffer

protected ByteBuffer tableBuffer

size

protected int size

regrowthThreshold

protected int regrowthThreshold

maxBuckets

protected int maxBuckets

growthCount

protected int growthCount

bucketUpdateHandler

protected ByteBufferHashTable.BucketUpdateHandler bucketUpdateHandler

Constructor Detail

ByteBufferHashTable

public ByteBufferHashTable(float maxLoadFactor,
                           int initialBuckets,
                           int bucketSizeWithHash,
                           ByteBuffer buffer,
                           int keySize,
                           int maxSizeForTesting,
                           ByteBufferHashTable.BucketUpdateHandler bucketUpdateHandler)

Method Detail

calculateTableArenaSizeWithPerBucketAdditionalSize

public static int calculateTableArenaSizeWithPerBucketAdditionalSize(int bufferCapacity,
                                                                     int bucketSize,
                                                                     int perBucketAdditionalSize)

calculateTableArenaSizeWithFixedAdditionalSize

public static int calculateTableArenaSizeWithFixedAdditionalSize(int bufferCapacity,
                                                                 int bucketSize,
                                                                 int fixedAdditionalSize)

reset

public void reset()

adjustTableWhenFull

public void adjustTableWhenFull()

initializeNewBucketKey

protected void initializeNewBucketKey(int bucket,
                                      ByteBuffer keyBuffer,
                                      int keyHash)

findBucketWithAutoGrowth

protected int findBucketWithAutoGrowth(ByteBuffer keyBuffer,
                                       int keyHash)

Find a bucket for a key, attempting to resize the table with adjustTableWhenFull() if possible.

Parameters:

keyBuffer - buffer containing the key

keyHash - hash of the key

Returns:

bucket number of the found bucket or -1 if a bucket could not be allocated after resizing.

findBucket

protected int findBucket(boolean allowNewBucket,
                         int buckets,
                         ByteBuffer targetTableBuffer,
                         ByteBuffer keyBuffer,
                         int keyHash)

Finds the bucket into which we should insert a key.

Parameters:

keyBuffer - key, must have exactly keySize bytes remaining. Will not be modified.

targetTableBuffer - Need selectable buffer, since when resizing hash table, findBucket() is used on the newly allocated table buffer

Returns:

bucket index for this key, or -1 if no bucket is available due to being full

canAllowNewBucket

protected boolean canAllowNewBucket()

getOffsetForBucket

protected int getOffsetForBucket(int bucket)

maxSizeForBuckets

protected int maxSizeForBuckets(int buckets)

isBucketUsed

protected boolean isBucketUsed(int bucket)

isOffsetUsed

protected boolean isOffsetUsed(int bucketOffset)

getTableBuffer

public ByteBuffer getTableBuffer()

getSize

public int getSize()

getRegrowthThreshold

public int getRegrowthThreshold()

getMaxBuckets

public int getMaxBuckets()

getGrowthCount

public int getGrowthCount()