org.apache.cassandra.db.rows

Class ColumnData.Reconciler

java.lang.Object

org.apache.cassandra.db.rows.ColumnData.Reconciler

All Implemented Interfaces:

java.lang.AutoCloseable, UpdateFunction<ColumnData,ColumnData>

Enclosing class:

ColumnData

public static class ColumnData.Reconciler
extends java.lang.Object
implements UpdateFunction<ColumnData,ColumnData>, java.lang.AutoCloseable

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.utils.btree.UpdateFunction

UpdateFunction.Simple<V>

Field Summary

Fields inherited from interface org.apache.cassandra.utils.btree.UpdateFunction

noOp

Constructor Summary

Constructors

Constructor and Description
Reconciler()

Method Summary

Modifier and Type	Method and Description
void	close()
ColumnData	insert(ColumnData insert) Computes the value that should be inserted in the BTree.
ColumnData	merge(ColumnData existing, ColumnData update) Computes the result of merging the existing value with the one from the update.
void	onAllocatedOnHeap(long heapSize)
ColumnData	retain(ColumnData existing) Checks if the specified value should be deleted or not.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.utils.btree.UpdateFunction

noOp

Constructor Detail

Reconciler

public Reconciler()

Method Detail

merge

public ColumnData merge(ColumnData existing,
                        ColumnData update)

Description copied from interface: UpdateFunction

Computes the result of merging the existing value with the one from the update.

Specified by:

merge in interface UpdateFunction<ColumnData,ColumnData>

Parameters:

existing - the value in the original tree we have matched

update - the value in the updating collection that matched

Returns:

the value to insert into the new tree

onAllocatedOnHeap

public void onAllocatedOnHeap(long heapSize)

Specified by:

onAllocatedOnHeap in interface UpdateFunction<ColumnData,ColumnData>

Parameters:

heapSize - extra heap space allocated (over previous tree)

insert

public ColumnData insert(ColumnData insert)

Description copied from interface: UpdateFunction

Computes the value that should be inserted in the BTree.

Specified by:

insert in interface UpdateFunction<ColumnData,ColumnData>

Parameters:

insert - the update value

Returns:

the value that should be inserted in the BTree

retain

public ColumnData retain(ColumnData existing)

Checks if the specified value should be deleted or not.

Parameters:

existing - the existing value to check

Returns:

null if the value should be removed from the BTree or the existing value if it should not.

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable