org.apache.cassandra.db

Class AbstractNativeCell

java.lang.Object

org.apache.cassandra.db.AbstractCell

org.apache.cassandra.db.AbstractNativeCell

All Implemented Interfaces:

IMeasurableMemory, Cell, CellName, Composite, OnDiskAtom

Direct Known Subclasses:

NativeCell

public abstract class AbstractNativeCell
extends AbstractCell
implements CellName

 Packs a CellName AND a Cell into one off-heap representation.
 Layout is:

 Note we store the ColumnIdentifier in full as bytes. This seems an okay tradeoff for now, as we just
 look it back up again when we need to, and in the near future we hope to switch to ints, longs or
 UUIDs representing column identifiers on disk, at which point we can switch that here as well.

 [timestamp][value offset][name size]][name extra][name offset deltas][cell names][value][Descendants]
 [   8b    ][     4b     ][    2b   ][     1b    ][     each 2b      ][ arb < 64k][ arb ][ arbitrary ]

 descendants: any overriding classes will put their state here
 name offsets are deltas from their base offset, and don't include the first offset, or the end position of the final entry,
 i.e. there will be size - 1 entries, and each is a delta that is added to the offset of the position of the first name
 (which is always CELL_NAME_OFFSETS_OFFSET + (2 * (size - 1))). The length of the final name fills up any remaining
 space upto the value offset
 name extra:  lowest 2 bits indicate the clustering size delta (i.e. how many name items are NOT part of the clustering key)
              the next 2 bits indicate the CellNameType
              the next bit indicates if the column is a static or clustered/dynamic column
 
 

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.db.composites.Composite

Composite.EOC

Nested classes/interfaces inherited from interface org.apache.cassandra.db.OnDiskAtom

OnDiskAtom.Serializer, OnDiskAtom.SerializerForWriting

Field Summary

Fields inherited from interface org.apache.cassandra.db.Cell

MAX_NAME_LENGTH

Constructor Summary

Constructors

Constructor and Description
AbstractNativeCell(NativeAllocator allocator, OpOrder.Group writeOp, Cell copyOf)

Method Summary

Methods

Modifier and Type	Method and Description
int	clusteringSize() The number of clustering components.
java.nio.ByteBuffer	collectionElement() The value of the collection element, or null if the cell is not part of a collection (i.e.
int	compareTo(Composite that)
int	compareToSimple(Composite that)
protected void	construct(Cell from)
CellName	copy(CFMetaData cfm, AbstractAllocator allocator)
ColumnIdentifier	cql3ColumnName(CFMetaData metadata) The name of the CQL3 column this cell represents.
int	dataSize()
Composite	end()
Composite.EOC	eoc()
boolean	equals(CellName that)
boolean	equals(java.lang.Object obj)
java.nio.ByteBuffer	get(int i)
protected byte	getByte(long offset)
protected java.nio.ByteBuffer	getByteBuffer(long offset, int length)
protected void	getBytes(long offset, byte[] trg, int trgOffset, int count)
protected int	getInt(long offset)
protected long	getLong(long offset)
protected int	getShort(long offset)
protected long	internalSize()
boolean	isCollectionCell()
boolean	isEmpty()
boolean	isPrefixOf(CType type, Composite c)
boolean	isSameCQL3RowAs(CellNameType type, CellName other) Whether this cell is part of the same CQL3 row as the other cell.
boolean	isStatic()
long	maxTimestamp()
long	minTimestamp()
protected int	postfixSize()
protected void	setByte(long offset, byte b)
protected void	setBytes(long offset, java.nio.ByteBuffer buffer)
protected void	setInt(long offset, int l)
protected void	setLong(long offset, long l)
protected void	setShort(long offset, short s)
int	size()
protected int	sizeOf(Cell cell)
ColumnSlice	slice()
Composite	start()
java.nio.ByteBuffer	toByteBuffer()
protected void	updateWithName(java.security.MessageDigest digest)
protected void	updateWithValue(java.security.MessageDigest digest)
java.nio.ByteBuffer	value()
Composite	withEOC(Composite.EOC eoc)
Cell	withUpdatedName(CellName newName)
Cell	withUpdatedTimestamp(long newTimestamp)
protected void	writeComponentTo(java.security.MessageDigest digest, int i, boolean includeSize)
protected void	writeMemoryTo(java.security.MessageDigest digest, int from, int count)

Methods inherited from class org.apache.cassandra.db.AbstractCell

cellDataSize, create, diff, diffCounter, equals, getLocalDeletionTime, getString, hashCode, isLive, isLive, onDiskIterator, reconcile, reconcileCounter, serializationFlags, serializedSize, updateDigest, validateFields, validateName

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.db.composites.CellName

unsharedHeapSizeExcludingData

Methods inherited from interface org.apache.cassandra.cache.IMeasurableMemory

unsharedHeapSize

Methods inherited from interface org.apache.cassandra.db.Cell

localCopy, localCopy, name, unsharedHeapSizeExcludingData

Methods inherited from interface org.apache.cassandra.db.OnDiskAtom

timestamp

Constructor Detail

AbstractNativeCell

public AbstractNativeCell(NativeAllocator allocator,
                  OpOrder.Group writeOp,
                  Cell copyOf)

Method Detail

sizeOf

protected int sizeOf(Cell cell)

construct

protected void construct(Cell from)

postfixSize

protected int postfixSize()

value

public java.nio.ByteBuffer value()

Specified by:

value in interface Cell

isStatic

public boolean isStatic()

Specified by:

isStatic in interface Composite

minTimestamp

public long minTimestamp()

maxTimestamp

public long maxTimestamp()

clusteringSize

public int clusteringSize()

Description copied from interface: CellName

The number of clustering components. It can be 0 if the table has no clustering columns, and it can be equal to size() if the table is dense() (in which case cql3ColumnName() will be null).

Specified by:

clusteringSize in interface CellName

cql3ColumnName

public ColumnIdentifier cql3ColumnName(CFMetaData metadata)

Description copied from interface: CellName

The name of the CQL3 column this cell represents. Will be null for cells of "dense" tables.

Specified by:

cql3ColumnName in interface CellName

collectionElement

public java.nio.ByteBuffer collectionElement()

Description copied from interface: CellName

The value of the collection element, or null if the cell is not part of a collection (i.e. if !isCollectionCell()).

Specified by:

collectionElement in interface CellName

isCollectionCell

public boolean isCollectionCell()

Specified by:

isCollectionCell in interface CellName

isSameCQL3RowAs

public boolean isSameCQL3RowAs(CellNameType type,
                      CellName other)

Description copied from interface: CellName

Whether this cell is part of the same CQL3 row as the other cell.

Specified by:

isSameCQL3RowAs in interface CellName

size

public int size()

Specified by:

size in interface Composite

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Composite

get

public java.nio.ByteBuffer get(int i)

Specified by:

get in interface Composite

writeComponentTo

protected void writeComponentTo(java.security.MessageDigest digest,
                    int i,
                    boolean includeSize)

writeMemoryTo

protected void writeMemoryTo(java.security.MessageDigest digest,
                 int from,
                 int count)

eoc

public Composite.EOC eoc()

Specified by:

eoc in interface Composite

withEOC

public Composite withEOC(Composite.EOC eoc)

Specified by:

withEOC in interface Composite

start

public Composite start()

Specified by:

start in interface Composite

end

public Composite end()

Specified by:

end in interface Composite

slice

public ColumnSlice slice()

Specified by:

slice in interface Composite

isPrefixOf

public boolean isPrefixOf(CType type,
                 Composite c)

Specified by:

isPrefixOf in interface Composite

toByteBuffer

public java.nio.ByteBuffer toByteBuffer()

Specified by:

toByteBuffer in interface Composite

updateWithName

protected void updateWithName(java.security.MessageDigest digest)

updateWithValue

protected void updateWithValue(java.security.MessageDigest digest)

dataSize

public int dataSize()

Specified by:

dataSize in interface Composite

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class AbstractCell

equals

public boolean equals(CellName that)

copy

public CellName copy(CFMetaData cfm,
            AbstractAllocator allocator)

Specified by:

copy in interface CellName

Specified by:

copy in interface Composite

withUpdatedName

public Cell withUpdatedName(CellName newName)

Specified by:

withUpdatedName in interface Cell

withUpdatedTimestamp

public Cell withUpdatedTimestamp(long newTimestamp)

Specified by:

withUpdatedTimestamp in interface Cell

internalSize

protected long internalSize()

setByte

protected final void setByte(long offset,
           byte b)

setShort

protected final void setShort(long offset,
            short s)

setInt

protected final void setInt(long offset,
          int l)

setLong

protected final void setLong(long offset,
           long l)

setBytes

protected final void setBytes(long offset,
            java.nio.ByteBuffer buffer)

getByte

protected final byte getByte(long offset)

getBytes

protected final void getBytes(long offset,
            byte[] trg,
            int trgOffset,
            int count)

getShort

protected final int getShort(long offset)

getInt

protected final int getInt(long offset)

getLong

protected final long getLong(long offset)

getByteBuffer

protected final java.nio.ByteBuffer getByteBuffer(long offset,
                                int length)

compareTo

@Inline
public final int compareTo(Composite that)

compareToSimple

public final int compareToSimple(Composite that)