Package org.apache.jackrabbit.oak.plugins.document.mongo

Class MongoBlobStore

java.lang.Object

org.apache.jackrabbit.oak.spi.blob.AbstractBlobStore

org.apache.jackrabbit.oak.plugins.blob.CachingBlobStore

org.apache.jackrabbit.oak.plugins.document.mongo.MongoBlobStore

All Implemented Interfaces:

AutoCloseable, Cache.Backend<AbstractBlobStore.BlockId,AbstractBlobStore.Data>, BlobStore, GarbageCollectableBlobStore

public class MongoBlobStore
extends CachingBlobStore

Implementation of blob store for the MongoDB extending from CachingBlobStore. It saves blobs into a separate collection in MongoDB (not using GridFS) and it supports basic garbage collection. FIXME: -Do we need to create commands for retry etc.? -Not sure if this is going to work for multiple MKs talking to same MongoDB?

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.jackrabbit.oak.spi.blob.AbstractBlobStore

AbstractBlobStore.BlockId, AbstractBlobStore.Data

Field Summary

Fields

Modifier and Type	Field	Description
static String	COLLECTION_BLOBS

Fields inherited from class org.apache.jackrabbit.oak.plugins.blob.CachingBlobStore

blobCacheSize, cache, DEFAULT_CACHE_SIZE, MEM_CACHE_NAME

Fields inherited from class org.apache.jackrabbit.oak.spi.blob.AbstractBlobStore

BLOCK_SIZE_LIMIT, HASH_ALGORITHM, inUse, TYPE_DATA, TYPE_HASH

Constructor Summary

Constructors

Constructor	Description
MongoBlobStore(@NotNull com.mongodb.client.MongoDatabase db, long cacheSize, @Nullable DocumentNodeStoreBuilder<?> builder)	Constructs a new MongoBlobStore
MongoBlobStore(com.mongodb.client.MongoDatabase db)	Constructs a new MongoBlobStore
MongoBlobStore(com.mongodb.client.MongoDatabase db, long cacheSize)	Constructs a new MongoBlobStore

Method Summary

Modifier and Type	Method	Description
long	countDeleteChunks(List<String> chunkIds, long maxLastModifiedTime)	Deletes the blobs with the given ids.
Iterator<String>	getAllChunkIds(long maxLastModifiedTime)	Gets all the identifiers.
protected boolean	isMarkEnabled()
protected void	mark(AbstractBlobStore.BlockId blockId)
protected byte[]	readBlockFromBackend(AbstractBlobStore.BlockId blockId)	Load the block from the storage backend.
void	startMark()	Start the mark phase.
protected void	storeBlock(byte[] digest, int level, byte[] data)	Store a block of data.
int	sweep()	Remove all unused blocks.

Methods inherited from class org.apache.jackrabbit.oak.plugins.blob.CachingBlobStore

clearCache, getBlobCacheSize, getCacheStats

Methods inherited from class org.apache.jackrabbit.oak.spi.blob.AbstractBlobStore

clearInUse, close, deleteChunks, getBlobId, getBlobLength, getBlockSize, getBlockSizeMin, getInputStream, getOrCreateReferenceKey, getReference, getStatsCollector, load, mark, markInUse, readBlob, resolveChunks, setBlockSize, setBlockSizeMin, setReferenceKey, setReferenceKeyEncoded, setReferenceKeyPlainText, setStatsCollector, usesBlobId, writeBlob, writeBlob, writeBlob

Methods inherited from class java.lang.Object

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

Field Detail

COLLECTION_BLOBS

public static final String COLLECTION_BLOBS

See Also:

Constant Field Values

Constructor Detail

MongoBlobStore

public MongoBlobStore(com.mongodb.client.MongoDatabase db)

Constructs a new MongoBlobStore

Parameters:

db - the database

MongoBlobStore

public MongoBlobStore(com.mongodb.client.MongoDatabase db,
                      long cacheSize)

Constructs a new MongoBlobStore

Parameters:

db - the database

cacheSize - the cache size

MongoBlobStore

public MongoBlobStore(@NotNull
                      @NotNull com.mongodb.client.MongoDatabase db,
                      long cacheSize,
                      @Nullable
                      @Nullable DocumentNodeStoreBuilder<?> builder)

Constructs a new MongoBlobStore

Parameters:

db - the database

cacheSize - the cache size

builder - DocumentNodeStoreBuilder, supplying further options

Method Detail

storeBlock

protected void storeBlock(byte[] digest,
                          int level,
                          byte[] data)
                   throws IOException

Description copied from class: AbstractBlobStore

Store a block of data.

Specified by:

storeBlock in class AbstractBlobStore

Parameters:

digest - the content hash (32 bytes)

level - the indirection level (0 is for user data, 1 is a list of digests that point to user data, 2 is a list of digests that point to digests, and so on). This parameter is for informational use only, and it is not required to store it unless that's easy to achieve

data - the data to be stored (the number of bytes is at most the block size)

Throws:

IOException

readBlockFromBackend

protected byte[] readBlockFromBackend(AbstractBlobStore.BlockId blockId)
                               throws Exception

Description copied from class: AbstractBlobStore

Load the block from the storage backend. Returns null if the block was not found.

Specified by:

readBlockFromBackend in class AbstractBlobStore

Parameters:

blockId - the block id

Returns:

the block data, or null

Throws:

Exception

startMark

public void startMark()
               throws IOException

Description copied from interface: GarbageCollectableBlobStore

Start the mark phase.

Specified by:

startMark in interface GarbageCollectableBlobStore

Specified by:

startMark in class AbstractBlobStore

Throws:

IOException

isMarkEnabled

protected boolean isMarkEnabled()

Specified by:

isMarkEnabled in class AbstractBlobStore

mark

protected void mark(AbstractBlobStore.BlockId blockId)
             throws Exception

Specified by:

mark in class AbstractBlobStore

Throws:

Exception

sweep

public int sweep()
          throws IOException

Description copied from interface: GarbageCollectableBlobStore

Remove all unused blocks.

Specified by:

sweep in interface GarbageCollectableBlobStore

Specified by:

sweep in class AbstractBlobStore

Returns:

the number of removed blocks

Throws:

IOException

countDeleteChunks

public long countDeleteChunks(List<String> chunkIds,
                              long maxLastModifiedTime)
                       throws Exception

Description copied from interface: GarbageCollectableBlobStore

Deletes the blobs with the given ids.

Parameters:

chunkIds - the chunk ids

maxLastModifiedTime - the max last modified time to consider for retrieval, with the special value '0' meaning no filtering by time

Returns:

long the count of successful deletions

Throws:

Exception - the exception

getAllChunkIds

public Iterator<String> getAllChunkIds(long maxLastModifiedTime)
                                throws Exception

Description copied from interface: GarbageCollectableBlobStore

Gets all the identifiers.

Parameters:

maxLastModifiedTime - the max last modified time to consider for retrieval, with the special value '0' meaning no filtering by time

Returns:

the identifiers

Throws:

Exception - the exception