org.apache.cassandra.db
Class CounterUpdateColumn

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

All Implemented Interfaces:

IColumn

public class CounterUpdateColumn
extends Column

A counter update while it hasn't been applied yet by the leader replica. Contains a single counter update. When applied by the leader replica, this is transformed to a relevant CounterColumn. This Column is a temporary data structure that should never be stored inside a memtable or an sstable.

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

CounterUpdateColumn(java.nio.ByteBuffer name, java.nio.ByteBuffer value, long timestamp)

CounterUpdateColumn(java.nio.ByteBuffer name, long value, long timestamp)

Method Summary

long	delta()
IColumn	diff(IColumn column)
CounterColumn	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.
IColumn	reconcile(IColumn column, Allocator allocator)
int	serializationFlags()

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

addColumn, addColumn, equals, getLocalDeletionTime, getMarkedForDeleteAt, getString, getSubColumn, getSubColumns, hashCode, isLive, isMarkedForDelete, maxTimestamp, minTimestamp, mostRecentLiveChangeAt, name, reconcile, serializedSize, serializer, size, timestamp, updateDigest, validateFields, validateName, value

Methods inherited from class java.lang.Object

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

Constructor Detail

CounterUpdateColumn

public CounterUpdateColumn(java.nio.ByteBuffer name,
                           long value,
                           long timestamp)

CounterUpdateColumn

public CounterUpdateColumn(java.nio.ByteBuffer name,
                           java.nio.ByteBuffer value,
                           long timestamp)

Method Detail

delta

public long delta()

diff

public IColumn diff(IColumn column)

Specified by:

diff in interface IColumn

Overrides:

diff in class Column

reconcile

public IColumn reconcile(IColumn column,
                         Allocator allocator)

Specified by:

reconcile in interface IColumn

Overrides:

reconcile in class Column

serializationFlags

public int serializationFlags()

Specified by:

serializationFlags in interface IColumn

Overrides:

serializationFlags in class Column

localCopy

public CounterColumn 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