org.csc.phynixx.tutorial
Class UTFWriterImpl

java.lang.Object
  org.csc.phynixx.tutorial.UTFWriterImpl

All Implemented Interfaces:

UTFWriter

public class UTFWriterImpl
extends Object
implements UTFWriter

Implements an quit simple an cooperating lock. To have acces to write to the file, you have to aquire a lock. If the lock is successful, you gain an lockToken. This token identifies the lock and this token enables you to release the token. If the file is lock all method to write/rad the file are unsynchronized to improve performance.

Constructor Summary

UTFWriterImpl(File file)

Method Summary

void	close() Schliesst die Datei und den FileChannel
String	getFilename()
boolean	isClosed() zeigt an, ob die Instanz geschlossen ist
String	lock()
long	position()
List<String>	readContent() reads the content
void	resetContent() resets the content of the file associated with die current transaction
void	restoreSize(long filePosition)
long	size()
String	toString()
void	unlock(String lockToken)
long	write(String value) writes a string to file

Methods inherited from class java.lang.Object

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

Constructor Detail

UTFWriterImpl

public UTFWriterImpl(File file)

Method Detail

lock

public String lock()
            throws InterruptedException

Specified by:

lock in interface UTFWriter

Returns:

lockToken you need to identify the unlock

Throws:

InterruptedException

unlock

public void unlock(String lockToken)

Specified by:

unlock in interface UTFWriter

Parameters:

lockToken - identifing the lock

close

public void close()

Schliesst die Datei und den FileChannel

Specified by:

close in interface UTFWriter

getFilename

public String getFilename()
                   throws IOException

Specified by:

getFilename in interface UTFWriter

Throws:

IOException

isClosed

public boolean isClosed()

zeigt an, ob die Instanz geschlossen ist

Specified by:

isClosed in interface UTFWriter

Returns:

true wenn die Datei geschlossen ist

resetContent

public void resetContent()
                  throws IOException

Description copied from interface: UTFWriter

resets the content of the file associated with die current transaction

Specified by:

resetContent in interface UTFWriter

Throws:

IOException

write

public long write(String value)
           throws IOException

Description copied from interface: UTFWriter

writes a string to file

Specified by:

write in interface UTFWriter

Returns:

Throws:

IOException

readContent

public List<String> readContent()
                         throws IOException

Description copied from interface: UTFWriter

reads the content

Specified by:

readContent in interface UTFWriter

Returns:

Throws:

IOException

size

public long size()
          throws IOException

Specified by:

size in interface UTFWriter

Throws:

IOException

restoreSize

public void restoreSize(long filePosition)
                 throws IOException

Specified by:

restoreSize in interface UTFWriter

Throws:

IOException

position

public long position()
              throws IOException

Specified by:

position in interface UTFWriter

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object