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

A top-level (row) tombstone.

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.
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.
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)
boolean	equals(java.lang.Object o)
int	hashCode()
boolean	isDeleted(OnDiskAtom atom)
boolean	isGcAble(int gcBefore)
boolean	isLive() Returns whether this DeletionTime is live, that is deletes no columns.
boolean	supersedes(DeletionTime dt)
java.lang.String	toString()
long	unsharedHeapSize()

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.

markedForDeleteAt

public final 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 final 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.

serializer

public static final DeletionTime.Serializer serializer

Constructor Detail

DeletionTime

public DeletionTime(long markedForDeleteAt,
                    int localDeletionTime)

Method Detail

isLive

public boolean isLive()

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

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>

isGcAble

public boolean isGcAble(int gcBefore)

isDeleted

public boolean isDeleted(OnDiskAtom atom)

supersedes

public boolean supersedes(DeletionTime dt)

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.