org.apache.jackrabbit.core.query.lucene
Interface RedoLog

public interface RedoLog

Defines a redo log for changes that have not been committed to disk. While nodes are added to and removed from the volatile index (held in memory) a redo log is maintained to keep track of the changes. In case the Jackrabbit process terminates unexpected the redo log is applied when Jackrabbit is restarted the next time.

Method Summary

void	append(MultiIndex.Action action) Appends an action to the log.
void	close() Flushes all pending writes to the redo log and closes it.
void	flush() Flushes all pending writes to the redo log.
List<MultiIndex.Action>	getActions() Returns a List with all MultiIndex.Action instances in the redo log.
int	getSize() Returns the number of entries in this redo log.
boolean	hasEntries() Returns true if this redo log contains any entries, false otherwise.

Method Detail

hasEntries

boolean hasEntries()

Returns true if this redo log contains any entries, false otherwise.

Returns:

true if this redo log contains any entries, false otherwise.

getSize

int getSize()

Returns the number of entries in this redo log.

Returns:

the number of entries in this redo log.

getActions

List<MultiIndex.Action> getActions()
                                   throws IOException

Returns a List with all MultiIndex.Action instances in the redo log.

Returns:

an List with all MultiIndex.Action instances in the redo log.

Throws:

IOException - if an error occurs while reading from the redo log.

append

void append(MultiIndex.Action action)
            throws IOException

Appends an action to the log.

Parameters:

action - the action to append.

Throws:

IOException - if the node cannot be written to the redo log.

flush

void flush()
           throws IOException

Flushes all pending writes to the redo log.

Throws:

IOException - if an error occurs while writing.

close

void close()
           throws IOException

Flushes all pending writes to the redo log and closes it.

Throws:

IOException - if an error occurs while writing.