Package org.apache.jackrabbit.core.data

Interface Backend

All Known Implementing Classes:

AbstractBackend, FSBackend

public interface Backend

The interface defines the backend which can be plugged into CachingDataStore.

Method Summary

Modifier and Type	Method	Description
void	close()	Close backend and release resources like database connection if any.
Set<DataIdentifier>	deleteAllOlderThan(long timestamp)	Delete all records which are older than timestamp.
void	deleteRecord(DataIdentifier identifier)	Delete record identified by identifier.
boolean	exists(DataIdentifier identifier)	This method check the existence of record in backend.
boolean	exists(DataIdentifier identifier, boolean touch)	This method check the existence of record in backend.
Iterator<DataIdentifier>	getAllIdentifiers()	Returns identifiers of all records that exists in backend.
long	getLastModified(DataIdentifier identifier)	Return lastModified of record identified by identifier.
long	getLength(DataIdentifier identifier)	Return length of record identified by identifier.
void	init(CachingDataStore store, String homeDir, String config)	This method initialize backend with the configuration.
InputStream	read(DataIdentifier identifier)	Return inputstream of record identified by identifier.
void	touch(DataIdentifier identifier, long minModifiedDate)	Update the lastModified of record if it's lastModified < minModifiedDate.
void	touchAsync(DataIdentifier identifier, long minModifiedDate, AsyncTouchCallback callback)	Update the lastModified of record if it's lastModified < minModifiedDate asynchronously.
void	write(DataIdentifier identifier, File file)	Stores file to backend with identifier used as key.
void	writeAsync(DataIdentifier identifier, File file, AsyncUploadCallback callback)	Write file to backend in asynchronous mode.

Method Details

init

void init(CachingDataStore store,
 String homeDir,
 String config)
   throws DataStoreException

This method initialize backend with the configuration.

Parameters:

store - CachingDataStore

homeDir - path of repository home dir.

config - path of config property file.

Throws:

DataStoreException

read

InputStream read(DataIdentifier identifier)
          throws DataStoreException

Return inputstream of record identified by identifier.

Parameters:

identifier - identifier of record.

Returns:

inputstream of the record.

Throws:

DataStoreException - if record not found or any error.

getLength

long getLength(DataIdentifier identifier)
        throws DataStoreException

Return length of record identified by identifier.

Parameters:

identifier - identifier of record.

Returns:

length of the record.

Throws:

DataStoreException - if record not found or any error.

getLastModified

long getLastModified(DataIdentifier identifier)
              throws DataStoreException

Return lastModified of record identified by identifier.

Parameters:

identifier - identifier of record.

Returns:

lastModified of the record.

Throws:

DataStoreException - if record not found or any error.

write

void write(DataIdentifier identifier,
 File file)
    throws DataStoreException

Stores file to backend with identifier used as key. If key pre-exists, it updates the timestamp of the key.

Parameters:

identifier - key of the file

file - file that would be stored in backend.

Throws:

DataStoreException - for any error.

writeAsync

void writeAsync(DataIdentifier identifier,
 File file,
 AsyncUploadCallback callback)
         throws DataStoreException

Write file to backend in asynchronous mode.

Parameters:

identifier -

file -

callback - Callback interface to called after upload succeed or failed.

Throws:

DataStoreException

getAllIdentifiers

Iterator<DataIdentifier> getAllIdentifiers()
                                    throws DataStoreException

Returns identifiers of all records that exists in backend.

Returns:

iterator consisting of all identifiers

Throws:

DataStoreException

exists

boolean exists(DataIdentifier identifier,
 boolean touch)
        throws DataStoreException

This method check the existence of record in backend. Return true if records exists else false. This method also touch record identified by identifier if touch is true.

Parameters:

identifier -

Throws:

DataStoreException

exists

boolean exists(DataIdentifier identifier)
        throws DataStoreException

This method check the existence of record in backend.

Parameters:

identifier - identifier to be checked.

Returns:

true if records exists else false.

Throws:

DataStoreException

touch

void touch(DataIdentifier identifier,
 long minModifiedDate)
    throws DataStoreException

Update the lastModified of record if it's lastModified < minModifiedDate.

Parameters:

identifier -

minModifiedDate -

Throws:

DataStoreException

touchAsync

void touchAsync(DataIdentifier identifier,
 long minModifiedDate,
 AsyncTouchCallback callback)
         throws DataStoreException

Update the lastModified of record if it's lastModified < minModifiedDate asynchronously. Result of update is passed using appropriate AsyncTouchCallback methods. If identifier's lastModified > minModified AsyncTouchCallback.onAbort(AsyncTouchResult) is called. Any exception is communicated through AsyncTouchCallback.onFailure(AsyncTouchResult) . On successful update of lastModified, AsyncTouchCallback.onSuccess(AsyncTouchResult) is invoked.

Parameters:

identifier -

minModifiedDate -

callback -

Throws:

DataStoreException

close

void close()
    throws DataStoreException

Close backend and release resources like database connection if any.

Throws:

DataStoreException

deleteAllOlderThan

Set<DataIdentifier> deleteAllOlderThan(long timestamp)
                                throws DataStoreException

Delete all records which are older than timestamp.

Parameters:

timestamp -

Returns:

Set of identifiers which are deleted.

Throws:

DataStoreException

deleteRecord

void deleteRecord(DataIdentifier identifier)
           throws DataStoreException

Delete record identified by identifier. No-op if identifier not found.

Parameters:

identifier -

Throws:

DataStoreException