net.kuujo.copycat.state.internal

Class SnapshottableLogManager

java.lang.Object

net.kuujo.copycat.state.internal.SnapshottableLogManager

All Implemented Interfaces:

Closeable, AutoCloseable, Loggable, LogManager

public class SnapshottableLogManager
extends Object
implements LogManager

Snapshottable log manager.

Author:

Jordan Halterman

Constructor Summary

Constructors

Constructor and Description
SnapshottableLogManager(LogManager logManager, LogManager snapshotManager)

Method Summary

Modifier and Type	Method and Description
long	appendEntry(ByteBuffer entry)
long	appendSnapshot(long index, List<ByteBuffer> snapshot) Appends a snapshot to the log.
void	close()
void	compact(long index)
LogConfig	config()
boolean	containsIndex(long index)
void	delete()
long	entryCount()
Long	firstIndex()
LogSegment	firstSegment()
void	flush()
ByteBuffer	getEntry(long index)
long	index()
boolean	isClosed()
boolean	isEmpty()
boolean	isOpen()
boolean	isSnapshottable(long index) Returns a boolean value indicating whether the given index is a snapshottable index.
Long	lastIndex()
LogSegment	lastSegment()
void	open()
void	removeAfter(long index)
void	rollOver(long index)
LogSegment	segment()
LogSegment	segment(long index)
TreeMap<Long,LogSegment>	segments()
long	size()

Methods inherited from class java.lang.Object

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

Constructor Detail

SnapshottableLogManager

public SnapshottableLogManager(LogManager logManager,
                               LogManager snapshotManager)

Method Detail

config

public LogConfig config()

Specified by:

config in interface LogManager

segments

public TreeMap<Long,LogSegment> segments()

Specified by:

segments in interface LogManager

segment

public LogSegment segment()

Specified by:

segment in interface LogManager

segment

public LogSegment segment(long index)

Specified by:

segment in interface LogManager

firstSegment

public LogSegment firstSegment()

Specified by:

firstSegment in interface LogManager

lastSegment

public LogSegment lastSegment()

Specified by:

lastSegment in interface LogManager

open

public void open()
          throws IOException

Specified by:

open in interface Loggable

Throws:

IOException

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Loggable

isOpen

public boolean isOpen()

Specified by:

isOpen in interface Loggable

size

public long size()

Specified by:

size in interface Loggable

entryCount

public long entryCount()

Specified by:

entryCount in interface Loggable

isSnapshottable

public boolean isSnapshottable(long index)

Returns a boolean value indicating whether the given index is a snapshottable index.

Parameters:

index - The index to check.

Returns:

Indicates whether a snapshot can be taken at the given index.

appendSnapshot

public long appendSnapshot(long index,
                           List<ByteBuffer> snapshot)
                    throws IOException

Appends a snapshot to the log.

Parameters:

index - The index at which to write the snapshot.

snapshot - The snapshot to append to the snapshot log.

Returns:

The index at which the snapshot was written.

Throws:

IOException - If the log could not be rolled over.

appendEntry

public long appendEntry(ByteBuffer entry)
                 throws IOException

Specified by:

appendEntry in interface Loggable

Throws:

IOException

index

public long index()

Specified by:

index in interface Loggable

firstIndex

public Long firstIndex()

Specified by:

firstIndex in interface Loggable

lastIndex

public Long lastIndex()

Specified by:

lastIndex in interface Loggable

containsIndex

public boolean containsIndex(long index)

Specified by:

containsIndex in interface Loggable

getEntry

public ByteBuffer getEntry(long index)

Specified by:

getEntry in interface Loggable

removeAfter

public void removeAfter(long index)

Specified by:

removeAfter in interface Loggable

rollOver

public void rollOver(long index)
              throws IOException

Specified by:

rollOver in interface LogManager

Throws:

IOException

compact

public void compact(long index)
             throws IOException

Specified by:

compact in interface LogManager

Throws:

IOException

flush

public void flush()

Specified by:

flush in interface Loggable

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Loggable

Throws:

IOException

isClosed

public boolean isClosed()

Specified by:

isClosed in interface Loggable

delete

public void delete()

Specified by:

delete in interface Loggable