org.apache.jackrabbit.oak.plugins.segment

Class CompactionMap

java.lang.Object

org.apache.jackrabbit.oak.plugins.segment.CompactionMap

public class CompactionMap
extends Object

A CompactionMap is a composite of multiple PartialCompactionMap instances. Operations performed on this map are delegated back to the individual maps.

Field Summary

Fields

Modifier and Type	Field and Description
static CompactionMap	EMPTY An empty map.

Method Summary

Methods

Modifier and Type	Method and Description
CompactionMap	cons(PartialCompactionMap head) Create a new CompactionMap containing all maps of this instances and additional the passed map head.
RecordId	get(RecordId before) Retrieve the record id before maps to or null if no such id exists.
int	getDepth() The depth of the compaction map is the number of partial compaction maps this map consists of.
long[]	getEstimatedWeights() The weight of the compaction map is its memory consumption bytes
int	getGeneration()
long[]	getRecordCounts() Number of records referenced by the keys in this map.
long[]	getSegmentCounts() Number of segments referenced by the keys in this map.
void	remove(Set<UUID> uuids) Remove all keys from this map where keys.contains(key.asUUID()).
static long	sum(long[] longs) Java's lacking libraries...
boolean	wasCompacted(UUID id) Checks whether content in the segment with the given identifier was compacted to new segments.
boolean	wasCompactedTo(RecordId before, RecordId after) Checks whether the record with the given before identifier was compacted to a new record with the given after identifier.

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY

public static final CompactionMap EMPTY

An empty map.

Method Detail

wasCompactedTo

public boolean wasCompactedTo(@Nonnull
                     RecordId before,
                     @Nonnull
                     RecordId after)

Checks whether the record with the given before identifier was compacted to a new record with the given after identifier.

Parameters:

before - before record identifier

after - after record identifier

Returns:

whether before was compacted to after

wasCompacted

public boolean wasCompacted(@Nonnull
                   UUID id)

Checks whether content in the segment with the given identifier was compacted to new segments.

Parameters:

id - segment identifier

Returns:

whether the identified segment was compacted

get

@CheckForNull
public RecordId get(@Nonnull
                        RecordId before)

Retrieve the record id before maps to or null if no such id exists.

Parameters:

before - before record id

Returns:

after record id or null

remove

public void remove(@Nonnull
          Set<UUID> uuids)

Remove all keys from this map where keys.contains(key.asUUID()).

Parameters:

uuids - uuids of the keys to remove

cons

@Nonnull
public CompactionMap cons(@Nonnull
                         PartialCompactionMap head)

Create a new CompactionMap containing all maps of this instances and additional the passed map head.

Parameters:

head -

Returns:

a new CompactionMap instance

sum

public static long sum(long[] longs)

Java's lacking libraries...

Parameters:

longs -

Returns:

sum of the passed longs

getDepth

public int getDepth()

The depth of the compaction map is the number of partial compaction maps this map consists of.

Returns:

the depth of this compaction map

See Also:

cons(PartialCompactionMap)

getGeneration

public int getGeneration()

getEstimatedWeights

public long[] getEstimatedWeights()

The weight of the compaction map is its memory consumption bytes

Returns:

Estimated weight of the compaction map

getSegmentCounts

public long[] getSegmentCounts()

Number of segments referenced by the keys in this map. The returned value might only be based on the compressed part of the individual maps.

Returns:

number of segments

getRecordCounts

public long[] getRecordCounts()

Number of records referenced by the keys in this map. The returned value might only be based on the compressed part of the individual maps.

Returns:

number of records