org.apache.cassandra.db

Class DeletionTime

java.lang.Object

org.apache.cassandra.db.DeletionTime

All Implemented Interfaces:

java.lang.Comparable<DeletionTime>, IMeasurableMemory

public class DeletionTime
extends java.lang.Object
implements java.lang.Comparable<DeletionTime>, IMeasurableMemory

Information on deletion of a storage engine object.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DeletionTime.Serializer

Field Summary

Fields

Modifier and Type	Field and Description
static DeletionTime	LIVE A special DeletionTime that signifies that there is no top-level (row) tombstone.
static DeletionTime.Serializer	serializer

Constructor Summary

Constructors

Constructor and Description
DeletionTime(long markedForDeleteAt, int localDeletionTime)

Method Summary

Modifier and Type	Method and Description
int	compareTo(DeletionTime dt)
int	dataSize()
boolean	deletes(Cell<?> cell)
boolean	deletes(LivenessInfo info)
boolean	deletes(long timestamp)
void	digest(Digest digest)
boolean	equals(java.lang.Object o)
int	hashCode()
boolean	isLive() Returns whether this DeletionTime is live, that is deletes no columns.
int	localDeletionTime() The local server timestamp, in seconds since the unix epoch, at which this tombstone was created.
long	markedForDeleteAt() A timestamp (typically in microseconds since the unix epoch, although this is not enforced) after which data should be considered deleted.
boolean	supersedes(DeletionTime dt)
java.lang.String	toString()
long	unsharedHeapSize()
boolean	validate() check if this deletion time is valid - localDeletionTime can never be negative

Methods inherited from class java.lang.Object

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

Field Detail

LIVE

public static final DeletionTime LIVE

A special DeletionTime that signifies that there is no top-level (row) tombstone.

serializer

public static final DeletionTime.Serializer serializer

Constructor Detail

DeletionTime

public DeletionTime(long markedForDeleteAt,
                    int localDeletionTime)

Method Detail

markedForDeleteAt

public long markedForDeleteAt()

A timestamp (typically in microseconds since the unix epoch, although this is not enforced) after which data should be considered deleted. If set to Long.MIN_VALUE, this implies that the data has not been marked for deletion at all.

localDeletionTime

public int localDeletionTime()

The local server timestamp, in seconds since the unix epoch, at which this tombstone was created. This is only used for purposes of purging the tombstone after gc_grace_seconds have elapsed.

isLive

public boolean isLive()

Returns whether this DeletionTime is live, that is deletes no columns.

digest

public void digest(Digest digest)

validate

public boolean validate()

check if this deletion time is valid - localDeletionTime can never be negative

Returns:

true if it is valid

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public final int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

compareTo

public int compareTo(DeletionTime dt)

Specified by:

compareTo in interface java.lang.Comparable<DeletionTime>

supersedes

public boolean supersedes(DeletionTime dt)

deletes

public boolean deletes(LivenessInfo info)

deletes

public boolean deletes(Cell<?> cell)

deletes

public boolean deletes(long timestamp)

dataSize

public int dataSize()

unsharedHeapSize

public long unsharedHeapSize()

Specified by:

unsharedHeapSize in interface IMeasurableMemory

Returns:

the amount of on-heap memory retained by the object that might be reclaimed if the object were reclaimed, i.e. it should try to exclude globally cached data where possible, or counting portions of arrays that are referenced by the object but used by other objects only (e.g. slabbed byte-buffers), etc.