tachyon.master

Class Journal

java.lang.Object

tachyon.master.Journal

public class Journal
extends Object

The Journal manages Tachyon image and journal log.

Constructor Summary

Constructors

Constructor and Description
Journal(String folder, String imageFileName, String editLogFileName) Create a Journal manager.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Close down the edit log
void	createEditLog(long startingTransactionId) Create an edit log.
void	createImage(MasterInfo info) Create a new image of the Master.
void	createImage(MasterInfo info, String imagePath) Create a new image of the Master to the specified path.
EditLog	getEditLog()
long	getImageModTimeMs() Get image file's last modification time.
long	loadEditLog(MasterInfo info) Load edit log.
void	loadImage(MasterInfo info) Load image file.
void	loadSingleLogFile(MasterInfo info, String path) Load one log file of the Master

Methods inherited from class java.lang.Object

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

Constructor Detail

Journal

public Journal(String folder,
       String imageFileName,
       String editLogFileName)
        throws IOException

Create a Journal manager.

Parameters:

folder - the folder contains image file and edit log files.

imageFileName - image file name

editLogFileName - edit file name

Throws:

IOException

Method Detail

close

public void close()

Close down the edit log

createEditLog

public void createEditLog(long startingTransactionId)
                   throws IOException

Create an edit log.

Parameters:

startingTransactionId - the starting transaction id of the edit log.

Throws:

IOException

createImage

public void createImage(MasterInfo info)
                 throws IOException

Create a new image of the Master. It will be created at the mImagePath. If the mStandbyImagePath isn't null, it will rename the mStandbyImagePath to the mImagePath.

Parameters:

info - The Master Info

Throws:

IOException

createImage

public void createImage(MasterInfo info,
               String imagePath)
                 throws IOException

Create a new image of the Master to the specified path.

Parameters:

info - The Master Info

imagePath - The path of the image to be created

Throws:

IOException

getEditLog

public EditLog getEditLog()

getImageModTimeMs

public long getImageModTimeMs()
                       throws IOException

Get image file's last modification time.

Returns:

the last modification time in millisecond.

Throws:

IOException

loadEditLog

public long loadEditLog(MasterInfo info)
                 throws IOException

Load edit log.

Parameters:

info - The Master Info.

Returns:

The last transaction id.

Throws:

IOException

loadImage

public void loadImage(MasterInfo info)
               throws IOException

Load image file.

Parameters:

info - The Master Info.

Throws:

IOException

loadSingleLogFile

public void loadSingleLogFile(MasterInfo info,
                     String path)
                       throws IOException

Load one log file of the Master

Parameters:

info - The Master Info

path - The path of the edit log

Throws:

IOException