Package org.apache.jackrabbit.oak.segment.scheduler

Class Commit

java.lang.Object

org.apache.jackrabbit.oak.segment.scheduler.Commit

public class Commit
extends Object

A Commit instance represents a set of related changes, which when applied to a base node state result in a new node state.

Constructor Summary

Constructors

Constructor	Description
Commit(@NotNull NodeBuilder changes, @NotNull CommitHook hook, @NotNull CommitInfo info)

Method Summary

Modifier and Type	Method	Description
void	applied(SegmentNodeState merged)	Does housekeeping work needed after applying the commit.
SegmentNodeState	apply(SegmentNodeState base)	Apply the changes represented by this commit to the passed base node state.
@Nullable GCGeneration	getGCGeneration()	This method makes a best effort on getting the gc generation of the current commit.
boolean	hasChanges()	Checks if the commit contains any changes.
CommitInfo	info()

Methods inherited from class java.lang.Object

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

Constructor Detail

Commit

public Commit(@NotNull
              @NotNull NodeBuilder changes,
              @NotNull
              @NotNull CommitHook hook,
              @NotNull
              @NotNull CommitInfo info)

Method Detail

getGCGeneration

@Nullable
public @Nullable GCGeneration getGCGeneration()

This method makes a best effort on getting the gc generation of the current commit. However it avoids causing a write ahead action by calling NodeBuilder.getName(String) on the changes in this commit.

Returns:

the gc generation of this commit or null if not yet available.

apply

public SegmentNodeState apply(SegmentNodeState base)
                       throws CommitFailedException

Apply the changes represented by this commit to the passed base node state.

Parameters:

base - the base node state to apply this commit to

Returns:

the resulting state from applying this commit to base.

Throws:

CommitFailedException - if the commit cannot be applied to base. (e.g. because of a conflict.)

applied

public void applied(SegmentNodeState merged)

Does housekeeping work needed after applying the commit.

Parameters:

merged - the current head node state, after applying the changes in the commit.

hasChanges

public boolean hasChanges()

Checks if the commit contains any changes. This is a shallow check, with the same semantics as SegmentNodeState.fastEquals(NodeState, NodeState), which cannot guarantee against false negatives.

Returns:

true, if the commit has changes.

info

public CommitInfo info()