org.apache.jackrabbit.oak.upgrade.blob

Class LengthCachingDataStore

java.lang.Object

org.apache.jackrabbit.core.data.AbstractDataStore

org.apache.jackrabbit.oak.upgrade.blob.LengthCachingDataStore

All Implemented Interfaces:

DataStore

public class LengthCachingDataStore
extends AbstractDataStore

A DelegatingDataStore can avoid performing expensive file system access by making use of pre computed data related to files in DataStore.

During repository migration actual blob content is not accessed and instead only the blob length and blob references are accessed. DelegatingDataStore can be configured with a mapping file which would be used to determine the length of given blob reference.

Mapping file format

#< length >| < identifier >
     4432|dd10bca036f3134352c63e534d4568a3d2ac2fdc
     32167|dd10bca036f3134567c63e534d4568a3d2ac2fdc
 

The Configuration:

<DataStore class="org.apache.jackrabbit.oak.upgrade.blob.LengthCachingDataStore">
      <param name="mappingFilePath" value="/path/to/mapping/file" />
      <param name="delegateClass" value="org.apache.jackrabbit.core.data.FileDataStore" />
  </DataStore>
 

Field Summary

Fields

Modifier and Type	Field and Description
static char	SEPARATOR Separator used while writing length and identifier to the mapping file

Constructor Summary

Constructors

Constructor and Description
LengthCachingDataStore()

Method Summary

Methods

Modifier and Type	Method and Description
DataRecord	addRecord(InputStream inputStream)
void	clearInUse()
void	close()
int	deleteAllOlderThan(long min)
Iterator<DataIdentifier>	getAllIdentifiers()
int	getMinRecordLength()
DataRecord	getRecordFromReference(String reference)
DataRecord	getRecordIfStored(DataIdentifier dataIdentifier)
void	init(String homeDir)
void	setDelegateClass(String delegateClass)
void	setDelegateConfigFilePath(String delegateConfigFilePath)
void	setMappingFilePath(String mappingFilePath)
void	setReadOnly(boolean readOnly)
void	updateModifiedDateOnAccess(long before)

Methods inherited from class org.apache.jackrabbit.core.data.AbstractDataStore

encodeHexString, getOrCreateReferenceKey, getRecord, getReferenceFromIdentifier

Methods inherited from class java.lang.Object

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

Field Detail

SEPARATOR

public static final char SEPARATOR

Separator used while writing length and identifier to the mapping file

See Also:

Constant Field Values

Constructor Detail

LengthCachingDataStore

public LengthCachingDataStore()

Method Detail

init

public void init(String homeDir)
          throws javax.jcr.RepositoryException

Throws:

javax.jcr.RepositoryException

getRecordIfStored

public DataRecord getRecordIfStored(DataIdentifier dataIdentifier)
                             throws DataStoreException

Throws:

DataStoreException

getRecordFromReference

public DataRecord getRecordFromReference(String reference)
                                  throws DataStoreException

Specified by:

getRecordFromReference in interface DataStore

Overrides:

getRecordFromReference in class AbstractDataStore

Throws:

DataStoreException

addRecord

public DataRecord addRecord(InputStream inputStream)
                     throws DataStoreException

Throws:

DataStoreException

updateModifiedDateOnAccess

public void updateModifiedDateOnAccess(long before)

deleteAllOlderThan

public int deleteAllOlderThan(long min)
                       throws DataStoreException

Throws:

DataStoreException

getAllIdentifiers

public Iterator<DataIdentifier> getAllIdentifiers()
                                           throws DataStoreException

Throws:

DataStoreException

getMinRecordLength

public int getMinRecordLength()

close

public void close()
           throws DataStoreException

Throws:

DataStoreException

clearInUse

public void clearInUse()

setMappingFilePath

public void setMappingFilePath(String mappingFilePath)

setReadOnly

public void setReadOnly(boolean readOnly)

setDelegateClass

public void setDelegateClass(String delegateClass)

setDelegateConfigFilePath

public void setDelegateConfigFilePath(String delegateConfigFilePath)