Package com.apple.foundationdb.async.rtree

Class AbstractChangeSet<S extends NodeSlot,N extends com.apple.foundationdb.async.rtree.AbstractNode<S,N>>

java.lang.Object

com.apple.foundationdb.async.rtree.AbstractChangeSet<S,N>

Type Parameters:

S - slot type class

N - node type class (self type)

All Implemented Interfaces:

Node.ChangeSet

public abstract class AbstractChangeSet<S extends NodeSlot,N extends com.apple.foundationdb.async.rtree.AbstractNode<S,N>>
extends Object
implements Node.ChangeSet

Abstract base implementations for all Node.ChangeSets.

Method Summary

Modifier and Type	Method	Description
void	apply(Transaction transaction)	Apply all mutations for the change set.
int	getLevel()	The level we should use when maintaining the node slot index.
N	getNode()	The node this change set applies to.
Node.ChangeSet	getPreviousChangeSet()	Previous change set in the chain of change sets.
boolean	isUpdateNodeSlotIndex()	Returns whether this change set needs to also update the node slot index.

Methods inherited from class java.lang.Object

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

Method Details

apply

public void apply(@Nonnull
 Transaction transaction)

Description copied from interface: Node.ChangeSet

Apply all mutations for the change set. These happen transactionally using the Transaction provided.

Specified by:

apply in interface Node.ChangeSet

Parameters:

transaction - transaction to use when making all modifications

getPreviousChangeSet

@Nullable
public Node.ChangeSet getPreviousChangeSet()

Previous change set in the chain of change sets. Can be null if there is no previous change set.

Returns:

the previous change set in the chain of change sets

getNode

@Nonnull
public N getNode()

The node this change set applies to.

Returns:

the node this change set applies to

getLevel

public int getLevel()

The level we should use when maintaining the node slot index. If level < 0, do not maintain the node slot index.

Returns:

the level used when maintaing the node slot index

isUpdateNodeSlotIndex

public boolean isUpdateNodeSlotIndex()

Returns whether this change set needs to also update the node slot index. There are scenarios where we do not need to update such an index in general. For instance, the user may not want to use such an index. In addition to that, there are change set implementations that should not update the index even if such and index is maintained in general. For instance, the moved-in slots were already persisted in the database before the move-in operation. We should not update the node slot index in such a case.

Returns:

true if we need to update the node slot index, false otherwise