io.debezium.connector.cassandra

Class FileOffsetWriter

java.lang.Object

io.debezium.connector.cassandra.FileOffsetWriter

All Implemented Interfaces:

OffsetWriter

public class FileOffsetWriter
extends Object
implements OffsetWriter

A concrete implementation of OffsetWriter which tracks the progress of events being processed by the SnapshotProcessor and CommitLogProcessor to property files, snapshot_offset.properties and commitlog_offset.properties, respectively. The property key is the table for the offset, and is serialized in the format of . The property value is the offset position, and is serialized in the format of :. For snapshots, a table is either fully processed or not processed at all, so offset is given a default value of ":-1" , where the filename is an empty string, and file position is -1. For commit logs, the file_name represents the commit log file name and file position represents bytes read in the commit log.

Field Summary

Fields

Modifier and Type	Field and Description
static String	COMMITLOG_OFFSET_FILE
private File	commitLogOffsetFile
private FileLock	commitLogOffsetFileLock
private Properties	commitLogProps
private static org.slf4j.Logger	LOGGER
private File	offsetDir
static String	SNAPSHOT_OFFSET_FILE
private File	snapshotOffsetFile
private FileLock	snapshotOffsetFileLock
private Properties	snapshotProps

Constructor Summary

Constructors

Constructor and Description
FileOffsetWriter(String offsetDir)

Method Summary

Modifier and Type	Method and Description
void	close() Close all resources used by this class.
void	flush() Flush latest offsets to disk.
private FileLock	init(File offsetFile)
boolean	isOffsetProcessed(String sourceTable, String sourceOffset, boolean isSnapshot) Determine if an offset has been processed based on the table name, offset position, and whether it is from snapshot or not.
private void	loadOffset(File offsetFile, Properties props)
void	markOffset(String sourceTable, String sourceOffset, boolean isSnapshot) Update the offset in memory if the provided offset is greater than the existing offset.
private static void	saveOffset(File offsetFile, Properties props)

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

private static final org.slf4j.Logger LOGGER

SNAPSHOT_OFFSET_FILE

public static final String SNAPSHOT_OFFSET_FILE

See Also:

Constant Field Values

COMMITLOG_OFFSET_FILE

public static final String COMMITLOG_OFFSET_FILE

See Also:

Constant Field Values

snapshotProps

private final Properties snapshotProps

commitLogProps

private final Properties commitLogProps

offsetDir

private final File offsetDir

snapshotOffsetFile

private final File snapshotOffsetFile

commitLogOffsetFile

private final File commitLogOffsetFile

snapshotOffsetFileLock

private final FileLock snapshotOffsetFileLock

commitLogOffsetFileLock

private final FileLock commitLogOffsetFileLock

Constructor Detail

FileOffsetWriter

public FileOffsetWriter(String offsetDir)
                 throws IOException

Throws:

IOException

Method Detail

markOffset

public void markOffset(String sourceTable,
                       String sourceOffset,
                       boolean isSnapshot)

Description copied from interface: OffsetWriter

Update the offset in memory if the provided offset is greater than the existing offset.

Specified by:

markOffset in interface OffsetWriter

Parameters:

sourceTable - string in the format of ..

sourceOffset - string in the format of :

isSnapshot - whether the offset is coming from a snapshot or commit log

isOffsetProcessed

public boolean isOffsetProcessed(String sourceTable,
                                 String sourceOffset,
                                 boolean isSnapshot)

Description copied from interface: OffsetWriter

Determine if an offset has been processed based on the table name, offset position, and whether it is from snapshot or not.

Specified by:

isOffsetProcessed in interface OffsetWriter

Parameters:

sourceTable - string in the format of .

.

sourceOffset - string in the format of :

isSnapshot - whether the offset is coming from a snapshot or commit log

Returns:

true if the offset has been processed, false otherwise.

flush

public void flush()

Description copied from interface: OffsetWriter

Flush latest offsets to disk.

Specified by:

flush in interface OffsetWriter

close

public void close()

Description copied from interface: OffsetWriter

Close all resources used by this class.

Specified by:

close in interface OffsetWriter

saveOffset

private static void saveOffset(File offsetFile,
                               Properties props)
                        throws IOException

Throws:

IOException

loadOffset

private void loadOffset(File offsetFile,
                        Properties props)
                 throws IOException

Throws:

IOException

init

private FileLock init(File offsetFile)
               throws IOException

Throws:

IOException

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