org.apache.jackrabbit.oak.plugins.blob.datastore

Class DataStoreBlobStore

java.lang.Object

org.apache.jackrabbit.oak.plugins.blob.datastore.DataStoreBlobStore

All Implemented Interfaces:

DataStore, SharedDataStore, BlobStore, GarbageCollectableBlobStore

public class DataStoreBlobStore
extends java.lang.Object
implements DataStore, SharedDataStore, BlobStore, GarbageCollectableBlobStore

BlobStore wrapper for DataStore. Wraps Jackrabbit 2 DataStore and expose them as BlobStores It also handles inlining binaries if there size is smaller than DataStore.getMinRecordLength()

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.jackrabbit.oak.plugins.blob.SharedDataStore

SharedDataStore.Type

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_CACHE_SIZE
static java.lang.String	MEM_CACHE_NAME

Constructor Summary

Constructors

Constructor and Description
DataStoreBlobStore(DataStore delegate)
DataStoreBlobStore(DataStore delegate, boolean encodeLengthInId)
DataStoreBlobStore(DataStore delegate, boolean encodeLengthInId, int cacheSizeInMB)

Method Summary

Modifier and Type	Method and Description
void	addMetadataRecord(java.io.InputStream stream, java.lang.String name) Adds the root record.
DataRecord	addRecord(java.io.InputStream stream) Creates a new data record.
void	clearCache() Clear the cache.
void	clearInUse() Clear the in-use list.
void	close() Close the data store
long	countDeleteChunks(java.util.List<java.lang.String> chunkIds, long maxLastModifiedTime) Deletes the blobs with the given ids.
void	deleteAllMetadataRecords(java.lang.String prefix) Deletes all records matching the given prefix.
int	deleteAllOlderThan(long min) Delete objects that have a modified date older than the specified date.
boolean	deleteChunks(java.util.List<java.lang.String> chunkIds, long maxLastModifiedTime) Deletes the blobs with the given ids.
boolean	deleteMetadataRecord(java.lang.String name) Deletes the root record represented by the given parameters.
java.util.Iterator<java.lang.String>	getAllChunkIds(long maxLastModifiedTime) Gets all the identifiers.
java.util.Iterator<DataIdentifier>	getAllIdentifiers() Get all identifiers.
java.util.List<DataRecord>	getAllMetadataRecords(java.lang.String prefix) Gets the all root records.
java.lang.String	getBlobId(java.lang.String reference) Returns the blobId that referred by the given binary reference.
long	getBlobLength(java.lang.String encodedBlobId) Get the length of the blob.
long	getBlockSizeMin() Get the minimum block size (if there is any).
CacheStats	getCacheStats()
DataStore	getDataStore()
java.io.InputStream	getInputStream(java.lang.String encodedBlobId) Returns a new stream for given blobId.
DataRecord	getMetadataRecord(java.lang.String name) Retrieves the metadata record with the given name
int	getMinRecordLength() Get the minimum size of an object that should be stored in this data store.
DataRecord	getRecord(DataIdentifier identifier) Returns the identified data record.
DataRecord	getRecordFromReference(java.lang.String reference) Returns the record that matches the given binary reference.
DataRecord	getRecordIfStored(DataIdentifier identifier) Check if a record for the given identifier exists, and return it if yes.
java.lang.String	getReference(java.lang.String encodedBlobId) Returns a secure reference to blob referred by blobid, or null if no such reference is available.
SharedDataStore.Type	getType() Gets the type.
void	init(java.lang.String homeDir) Initialized the data store
int	readBlob(java.lang.String encodedBlobId, long pos, byte[] buff, int off, int length) Read a number of bytes from a blob.
java.util.Iterator<java.lang.String>	resolveChunks(java.lang.String blobId) Resolve chunks stored in the blob store from the given Id.
void	setBlobStatsCollector(BlobStatsCollector stats)
void	setBlockSize(int x) Set the block size used by this blob store, if the blob store splits binaries into blocks.
void	setMaxCachedBinarySize(int maxCachedBinarySize)
void	startMark() Start the mark phase.
int	sweep() Remove all unused blocks.
java.lang.String	toString()
void	updateModifiedDateOnAccess(long before) From now on, update the modified date of an object even when accessing it.
java.lang.String	writeBlob(java.io.InputStream stream) Write a blob from an input stream.
java.lang.String	writeBlob(java.lang.String tempFileName) Write a blob from a temporary file.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

DEFAULT_CACHE_SIZE

public static final int DEFAULT_CACHE_SIZE

See Also:

Constant Field Values

MEM_CACHE_NAME

public static final java.lang.String MEM_CACHE_NAME

See Also:

Constant Field Values

Constructor Detail

DataStoreBlobStore

public DataStoreBlobStore(DataStore delegate)

DataStoreBlobStore

public DataStoreBlobStore(DataStore delegate,
                          boolean encodeLengthInId)

DataStoreBlobStore

public DataStoreBlobStore(DataStore delegate,
                          boolean encodeLengthInId,
                          int cacheSizeInMB)

Method Detail

getRecordIfStored

public DataRecord getRecordIfStored(DataIdentifier identifier)
                             throws DataStoreException

Description copied from interface: DataStore

Check if a record for the given identifier exists, and return it if yes. If no record exists, this method returns null.

Specified by:

getRecordIfStored in interface DataStore

Parameters:

identifier - data identifier

Returns:

the record if found, and null if not

Throws:

DataStoreException - if the data store could not be accessed

getRecord

public DataRecord getRecord(DataIdentifier identifier)
                     throws DataStoreException

Description copied from interface: DataStore

Returns the identified data record. The given identifier should be the identifier of a previously saved data record. Since records are never removed, there should never be cases where the identified record is not found. Abnormal cases like that are treated as errors and handled by throwing an exception.

Specified by:

getRecord in interface DataStore

Parameters:

identifier - data identifier

Returns:

identified data record

Throws:

DataStoreException - if the data store could not be accessed, or if the given identifier is invalid

getRecordFromReference

public DataRecord getRecordFromReference(java.lang.String reference)
                                  throws DataStoreException

Description copied from interface: DataStore

Returns the record that matches the given binary reference. Returns null if the reference is invalid, for example if it points to a record that does not exist.

Specified by:

getRecordFromReference in interface DataStore

Parameters:

reference - binary reference

Returns:

matching record, or null

Throws:

DataStoreException - if the data store could not be accessed

addRecord

public DataRecord addRecord(java.io.InputStream stream)
                     throws DataStoreException

Description copied from interface: DataStore

Creates a new data record. The given binary stream is consumed and a binary record containing the consumed stream is created and returned. If the same stream already exists in another record, then that record is returned instead of creating a new one.

The given stream is consumed and not closed by this method. It is the responsibility of the caller to close the stream. A typical call pattern would be:

     InputStream stream = ...;
     try {
         record = store.addRecord(stream);
     } finally {
         stream.close();
     }
 

Specified by:

addRecord in interface DataStore

Parameters:

stream - binary stream

Returns:

data record that contains the given stream

Throws:

DataStoreException - if the data store could not be accessed

updateModifiedDateOnAccess

public void updateModifiedDateOnAccess(long before)

Description copied from interface: DataStore

From now on, update the modified date of an object even when accessing it. Usually, the modified date is only updated when creating a new object, or when a new link is added to an existing object. When this setting is enabled, even getLength() will update the modified date.

Specified by:

updateModifiedDateOnAccess in interface DataStore

Parameters:

before - - update the modified date to the current time if it is older than this value

deleteAllOlderThan

public int deleteAllOlderThan(long min)
                       throws DataStoreException

Description copied from interface: DataStore

Delete objects that have a modified date older than the specified date.

Specified by:

deleteAllOlderThan in interface DataStore

Parameters:

min - the minimum time

Returns:

the number of data records deleted

Throws:

DataStoreException

getAllIdentifiers

public java.util.Iterator<DataIdentifier> getAllIdentifiers()
                                                     throws DataStoreException

Description copied from interface: DataStore

Get all identifiers.

Specified by:

getAllIdentifiers in interface DataStore

Returns:

an iterator over all DataIdentifier objects

Throws:

DataStoreException - if the list could not be read

init

public void init(java.lang.String homeDir)
          throws RepositoryException

Description copied from interface: DataStore

Initialized the data store

Specified by:

init in interface DataStore

Parameters:

homeDir - the home directory of the repository

Throws:

RepositoryException

getMinRecordLength

public int getMinRecordLength()

Description copied from interface: DataStore

Get the minimum size of an object that should be stored in this data store. Depending on the overhead and configuration, each store may return a different value.

Specified by:

getMinRecordLength in interface DataStore

Returns:

the minimum size in bytes

close

public void close()
           throws DataStoreException

Description copied from interface: DataStore

Close the data store

Specified by:

close in interface DataStore

Throws:

DataStoreException - if a problem occurred

writeBlob

public java.lang.String writeBlob(java.io.InputStream stream)
                           throws java.io.IOException

Description copied from interface: BlobStore

Write a blob from an input stream. This method closes the input stream.

Specified by:

writeBlob in interface BlobStore

Parameters:

stream - the input stream

Returns:

the blob id

Throws:

java.io.IOException

readBlob

public int readBlob(java.lang.String encodedBlobId,
                    long pos,
                    byte[] buff,
                    int off,
                    int length)
             throws java.io.IOException

Description copied from interface: BlobStore

Read a number of bytes from a blob.

Specified by:

readBlob in interface BlobStore

Parameters:

encodedBlobId - the blob id

pos - the position within the blob

buff - the target byte array

off - the offset within the target array

length - the number of bytes to read

Returns:

the number of bytes read

Throws:

java.io.IOException

getBlobLength

public long getBlobLength(java.lang.String encodedBlobId)
                   throws java.io.IOException

Description copied from interface: BlobStore

Get the length of the blob.

Specified by:

getBlobLength in interface BlobStore

Parameters:

encodedBlobId - the blob id

Returns:

the length

Throws:

java.io.IOException

getBlobId

public java.lang.String getBlobId(java.lang.String reference)

Description copied from interface: BlobStore

Returns the blobId that referred by the given binary reference. Returns null if the reference is invalid, for example if it points to a blob that does not exist.

Specified by:

getBlobId in interface BlobStore

Parameters:

reference - binary reference

Returns:

matching blobId, or null

getReference

public java.lang.String getReference(java.lang.String encodedBlobId)

Description copied from interface: BlobStore

Returns a secure reference to blob referred by blobid, or null if no such reference is available.

Specified by:

getReference in interface BlobStore

Parameters:

encodedBlobId - blobId referring the blob for which reference is required

Returns:

binary reference, or null

getInputStream

public java.io.InputStream getInputStream(java.lang.String encodedBlobId)
                                   throws java.io.IOException

Description copied from interface: BlobStore

Returns a new stream for given blobId. The streams returned from multiple calls to this method are byte wise equals. That is, subsequent calls to read return the same sequence of bytes as long as neither call throws an exception.

Specified by:

getInputStream in interface BlobStore

Parameters:

encodedBlobId - the blob id

Returns:

a new stream for given blobId

Throws:

java.io.IOException

setBlockSize

public void setBlockSize(int x)

Description copied from interface: GarbageCollectableBlobStore

Set the block size used by this blob store, if the blob store splits binaries into blocks. If not, this setting is ignored.

Specified by:

setBlockSize in interface GarbageCollectableBlobStore

Parameters:

x - the block size in bytes.

writeBlob

public java.lang.String writeBlob(java.lang.String tempFileName)
                           throws java.io.IOException

Description copied from interface: GarbageCollectableBlobStore

Write a blob from a temporary file. The temporary file is removed afterwards. A file based blob stores might simply rename the file, so that no additional writes are necessary.

Specified by:

writeBlob in interface GarbageCollectableBlobStore

Parameters:

tempFileName - the temporary file name

Returns:

the blob id

Throws:

java.io.IOException

sweep

public int sweep()
          throws java.io.IOException

Description copied from interface: GarbageCollectableBlobStore

Remove all unused blocks.

Specified by:

sweep in interface GarbageCollectableBlobStore

Returns:

the number of removed blocks

Throws:

java.io.IOException

startMark

public void startMark()
               throws java.io.IOException

Description copied from interface: GarbageCollectableBlobStore

Start the mark phase.

Specified by:

startMark in interface GarbageCollectableBlobStore

Throws:

java.io.IOException

clearInUse

public void clearInUse()

Description copied from interface: DataStore

Clear the in-use list. This is only used for testing to make the the garbage collection think that objects are no longer in use.

Specified by:

clearInUse in interface DataStore

Specified by:

clearInUse in interface GarbageCollectableBlobStore

clearCache

public void clearCache()

Description copied from interface: GarbageCollectableBlobStore

Clear the cache.

Specified by:

clearCache in interface GarbageCollectableBlobStore

getBlockSizeMin

public long getBlockSizeMin()

Description copied from interface: GarbageCollectableBlobStore

Get the minimum block size (if there is any).

Specified by:

getBlockSizeMin in interface GarbageCollectableBlobStore

Returns:

the block size

getAllChunkIds

public java.util.Iterator<java.lang.String> getAllChunkIds(long maxLastModifiedTime)
                                                    throws java.lang.Exception

Description copied from interface: GarbageCollectableBlobStore

Gets all the identifiers.

Specified by:

getAllChunkIds in interface GarbageCollectableBlobStore

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:

java.lang.Exception - the exception

deleteChunks

public boolean deleteChunks(java.util.List<java.lang.String> chunkIds,
                            long maxLastModifiedTime)
                     throws java.lang.Exception

Description copied from interface: GarbageCollectableBlobStore

Deletes the blobs with the given ids.

Specified by:

deleteChunks in interface GarbageCollectableBlobStore

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:

true, if successful

Throws:

java.lang.Exception - the exception

countDeleteChunks

public long countDeleteChunks(java.util.List<java.lang.String> chunkIds,
                              long maxLastModifiedTime)
                       throws java.lang.Exception

Description copied from interface: GarbageCollectableBlobStore

Deletes the blobs with the given ids.

Specified by:

countDeleteChunks in interface GarbageCollectableBlobStore

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:

java.lang.Exception - the exception

resolveChunks

public java.util.Iterator<java.lang.String> resolveChunks(java.lang.String blobId)
                                                   throws java.io.IOException

Description copied from interface: GarbageCollectableBlobStore

Resolve chunks stored in the blob store from the given Id. This will not return any chunks stored in-line in the id.

Specified by:

resolveChunks in interface GarbageCollectableBlobStore

Parameters:

blobId - the blob id

Returns:

the iterator

Throws:

java.io.IOException - Signals that an I/O exception has occurred.

addMetadataRecord

public void addMetadataRecord(java.io.InputStream stream,
                              java.lang.String name)
                       throws DataStoreException

Description copied from interface: SharedDataStore

Adds the root record.

Specified by:

addMetadataRecord in interface SharedDataStore

Parameters:

stream - the stream

name - the name of the root record

Throws:

DataStoreException - the data store exception

getMetadataRecord

public DataRecord getMetadataRecord(java.lang.String name)

Description copied from interface: SharedDataStore

Retrieves the metadata record with the given name

Specified by:

getMetadataRecord in interface SharedDataStore

Parameters:

name - the name of the record

Returns:

getAllMetadataRecords

public java.util.List<DataRecord> getAllMetadataRecords(java.lang.String prefix)

Description copied from interface: SharedDataStore

Gets the all root records.

Specified by:

getAllMetadataRecords in interface SharedDataStore

Returns:

the all root records

deleteMetadataRecord

public boolean deleteMetadataRecord(java.lang.String name)

Description copied from interface: SharedDataStore

Deletes the root record represented by the given parameters.

Specified by:

deleteMetadataRecord in interface SharedDataStore

Parameters:

name - the name of the root record

Returns:

success/failure

deleteAllMetadataRecords

public void deleteAllMetadataRecords(java.lang.String prefix)

Description copied from interface: SharedDataStore

Deletes all records matching the given prefix.

Specified by:

deleteAllMetadataRecords in interface SharedDataStore

Parameters:

prefix - metadata type identifier

getType

public SharedDataStore.Type getType()

Description copied from interface: SharedDataStore

Gets the type.

Specified by:

getType in interface SharedDataStore

Returns:

the type

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getDataStore

public DataStore getDataStore()

getCacheStats

public CacheStats getCacheStats()

setMaxCachedBinarySize

public void setMaxCachedBinarySize(int maxCachedBinarySize)

setBlobStatsCollector

public void setBlobStatsCollector(BlobStatsCollector stats)