org.apache.cassandra.utils.btree

Interface UpdateFunction<K,V>

All Superinterfaces:

com.google.common.base.Function<K,V>

All Known Implementing Classes:

UpdateFunction.Simple

public interface UpdateFunction<K,V>
extends com.google.common.base.Function<K,V>

An interface defining a function to be applied to both the object we are replacing in a BTree and the object that is intended to replace it, returning the object to actually replace it.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	UpdateFunction.Simple<V>

Field Summary

Fields

Modifier and Type	Field and Description
static UpdateFunction.Simple<java.lang.Object>	noOp

Method Summary

Modifier and Type	Method and Description
boolean	abortEarly()
void	allocated(long heapSize)
V	apply(V replacing, K update)
static <K> UpdateFunction<K,K>	noOp()

Methods inherited from interface com.google.common.base.Function

apply, equals

Field Detail

noOp

static final UpdateFunction.Simple<java.lang.Object> noOp

Method Detail

apply

V apply(V replacing,
        K update)

Parameters:

replacing - 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

abortEarly

boolean abortEarly()

Returns:

true if we should fail the update

allocated

void allocated(long heapSize)

Parameters:

heapSize - extra heap space allocated (over previous tree)

noOp

static <K> UpdateFunction<K,K> noOp()