org.apache.cassandra.db
Class ExpiringColumn

java.lang.Object
  org.apache.cassandra.db.Column
      org.apache.cassandra.db.ExpiringColumn

All Implemented Interfaces:

IColumn

public class ExpiringColumn
extends Column

Alternative to Column that have an expiring time. ExpiringColumn is immutable (as Column is). Note that ExpiringColumn does not override Column.getMarkedForDeleteAt, which means that it's in the somewhat unintuitive position of being deleted (after its expiration) without having a time-at-which-it-became-deleted. (Because ttl is a server-side measurement, we can't mix it with the timestamp field, which is client-supplied and whose resolution we can't assume anything about.)

Field Summary

Fields inherited from class org.apache.cassandra.db.Column

name, timestamp, value

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

MAX_NAME_LENGTH

Constructor Summary

ExpiringColumn(java.nio.ByteBuffer name, java.nio.ByteBuffer value, long timestamp, int timeToLive)

ExpiringColumn(java.nio.ByteBuffer name, java.nio.ByteBuffer value, long timestamp, int timeToLive, int localExpirationTime)

Method Summary

static Column	create(java.nio.ByteBuffer name, java.nio.ByteBuffer value, long timestamp, int timeToLive, int localExpirationTime, int expireBefore, IColumnSerializer.Flag flag)
int	getLocalDeletionTime()
long	getMarkedForDeleteAt()
java.lang.String	getString(AbstractType comparator)
int	getTimeToLive()
boolean	isMarkedForDelete()
IColumn	localCopy(ColumnFamilyStore cfs) clones the column for the row cache, interning column names and making copies of other underlying byte buffers
IColumn	localCopy(ColumnFamilyStore cfs, Allocator allocator) clones the column for the memtable, interning column names and making copies of other underlying byte buffers.
int	serializationFlags()
int	size()
void	updateDigest(java.security.MessageDigest digest)
void	validateFields(CFMetaData metadata)

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

addColumn, addColumn, diff, equals, getSubColumn, getSubColumns, hasExpiredTombstones, hashCode, isLive, maxTimestamp, mostRecentLiveChangeAt, name, reconcile, reconcile, serializedSize, serializer, timestamp, validateName, value

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpiringColumn

public ExpiringColumn(java.nio.ByteBuffer name,
                      java.nio.ByteBuffer value,
                      long timestamp,
                      int timeToLive)

ExpiringColumn

public ExpiringColumn(java.nio.ByteBuffer name,
                      java.nio.ByteBuffer value,
                      long timestamp,
                      int timeToLive,
                      int localExpirationTime)

Method Detail

create

public static Column create(java.nio.ByteBuffer name,
                            java.nio.ByteBuffer value,
                            long timestamp,
                            int timeToLive,
                            int localExpirationTime,
                            int expireBefore,
                            IColumnSerializer.Flag flag)

Returns:

Either a DeletedColumn, or an ExpiringColumn.

getTimeToLive

public int getTimeToLive()

isMarkedForDelete

public boolean isMarkedForDelete()

Specified by:

isMarkedForDelete in interface IColumn

Overrides:

isMarkedForDelete in class Column

size

public int size()

Specified by:

size in interface IColumn

Overrides:

size in class Column

updateDigest

public void updateDigest(java.security.MessageDigest digest)

Specified by:

updateDigest in interface IColumn

Overrides:

updateDigest in class Column

getLocalDeletionTime

public int getLocalDeletionTime()

Specified by:

getLocalDeletionTime in interface IColumn

Overrides:

getLocalDeletionTime in class Column

localCopy

public IColumn localCopy(ColumnFamilyStore cfs)

Description copied from interface: IColumn

clones the column for the row cache, interning column names and making copies of other underlying byte buffers

Specified by:

localCopy in interface IColumn

Overrides:

localCopy in class Column

localCopy

public IColumn localCopy(ColumnFamilyStore cfs,
                         Allocator allocator)

Description copied from interface: IColumn

clones the column for the memtable, interning column names and making copies of other underlying byte buffers. Unlike the other localCopy, this uses Allocator to allocate values in contiguous memory regions, which helps avoid heap fragmentation.

Specified by:

localCopy in interface IColumn

Overrides:

localCopy in class Column

getString

public java.lang.String getString(AbstractType comparator)

Specified by:

getString in interface IColumn

Overrides:

getString in class Column

getMarkedForDeleteAt

public long getMarkedForDeleteAt()

Specified by:

getMarkedForDeleteAt in interface IColumn

Overrides:

getMarkedForDeleteAt in class Column

serializationFlags

public int serializationFlags()

Specified by:

serializationFlags in interface IColumn

Overrides:

serializationFlags in class Column

validateFields

public void validateFields(CFMetaData metadata)
                    throws MarshalException

Specified by:

validateFields in interface IColumn

Overrides:

validateFields in class Column

Throws:

MarshalException