org.apache.jackrabbit.oak.segment.spi.persistence

Interface JournalFile

All Known Implementing Classes:

AwsJournalFile, AzureJournalFile, LocalJournalFile, SplitJournalFile

public interface JournalFile

The journal is a special, atomically updated file that records the state of the repository as a sequence of references to successive root node records. See oak-segment-tar documentation for more details.

Method Summary

Modifier and Type	Method and Description
boolean	exists() Check if the journal already exists.
java.lang.String	getName() Return the name representing the journal file.
JournalFileReader	openJournalReader() Opens the journal file for reading.
JournalFileWriter	openJournalWriter() Opens the journal file for writing.

Method Detail

openJournalReader

JournalFileReader openJournalReader()
                             throws java.io.IOException

Opens the journal file for reading. The returned object will represent the current state of the journal. Subsequent writes made by the JournalFileWriter won't be visible until a new JournalFileReader is opened.

Returns:

the reader representing the current state of the journal

Throws:

java.io.IOException

openJournalWriter

JournalFileWriter openJournalWriter()
                             throws java.io.IOException

Opens the journal file for writing.

Returns:

Throws:

java.io.IOException

getName

java.lang.String getName()

Return the name representing the journal file.

Returns:

name (eg. file name) representing the journal

exists

boolean exists()

Check if the journal already exists.

Returns:

true if the journal has been already created by the JournalFileWriter