Package com.apple.foundationdb.record.lucene.directory

Class FDBDirectorySharedCache

java.lang.Object

com.apple.foundationdb.record.lucene.directory.FDBDirectorySharedCache

@API(EXPERIMENTAL)
@ThreadSafe
public class FDBDirectorySharedCache
extends Object

A shared cache for a single FDBDirectory.

Constructor Summary

Constructors

Constructor	Description
FDBDirectorySharedCache(Tuple key, long sequenceNumber, int maximumSize, int concurrencyLevel, int initialCapacity)

Method Summary

Modifier and Type	Method	Description
byte[]	getBlockIfPresent(long id, int blockNumber)	Get a block from a file if present in the cache.
ConcurrentMap<Long,AtomicInteger>	getFieldInfosReferenceCount()
Map<String,FDBLuceneFileReference>	getFileReferencesIfPresent()	Get the set of file references for this directory, if present in the cache.
Tuple	getKey()	Get the key for this directory cache.
long	getSequenceNumber()	Get the sequence number of this directory cache.
void	putBlockIfAbsent(long id, int blockNumber, byte[] block)	Add a block from a file to the cache.
void	setFieldInfosReferenceCount(ConcurrentMap<Long,AtomicInteger> fieldInfosReferenceCount)
void	setFileReferencesIfAbsent(Map<String,FDBLuceneFileReference> fileReferences)	Add set of file references to the cache.

Methods inherited from class java.lang.Object

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

Constructor Details

FDBDirectorySharedCache

public FDBDirectorySharedCache(@Nonnull
 Tuple key,
 long sequenceNumber,
 int maximumSize,
 int concurrencyLevel,
 int initialCapacity)

Method Details

getKey

@Nonnull
public Tuple getKey()

Get the key for this directory cache. The key is relative to the record store root, so including the index subspace prefix and any grouping keys.

Returns:

the key for this directory cache

getSequenceNumber

public long getSequenceNumber()

Get the sequence number of this directory cache. The sequence number advances whenever new data is written to the directory.

Returns:

the sequence number of this directory cache

getFileReferencesIfPresent

@Nullable
public Map<String,FDBLuceneFileReference> getFileReferencesIfPresent()

Get the set of file references for this directory, if present in the cache.

Returns:

cached file references or null if not cached

setFileReferencesIfAbsent

public void setFileReferencesIfAbsent(@Nonnull
 Map<String,FDBLuceneFileReference> fileReferences)

Add set of file references to the cache.

Parameters:

fileReferences - the file references for the associated directory as of the sequence number

getBlockIfPresent

@Nullable
public byte[] getBlockIfPresent(long id,
 int blockNumber)

Get a block from a file if present in the cache.

Parameters:

id - file id

blockNumber - block number in the file

Returns:

the cached block or null if not cached

putBlockIfAbsent

public void putBlockIfAbsent(long id,
 int blockNumber,
 @Nonnull
 byte[] block)

Add a block from a file to the cache.

Parameters:

id - file id

blockNumber - block number in the file

block - the block to be cached

setFieldInfosReferenceCount

public void setFieldInfosReferenceCount(ConcurrentMap<Long,AtomicInteger> fieldInfosReferenceCount)

getFieldInfosReferenceCount

public ConcurrentMap<Long,AtomicInteger> getFieldInfosReferenceCount()