org.csc.phynixx.loggersystem.logger.channellogger
Class FileChannelDataLogger

java.lang.Object
  org.csc.phynixx.loggersystem.logger.channellogger.FileChannelDataLogger

All Implemented Interfaces:

IDataLogger

public class FileChannelDataLogger
extends Object
implements IDataLogger

Logger uses a TAEnabledRandomAccessFile to persist the data. If the Logger is open, it holds a lock on This class is not thread safe . Use facades to protect instances

Constructor Summary

FileChannelDataLogger(File logFileAccess, AccessMode aceessMode)
Opens a logger on base of die given logfile.

Method Summary

void	close() close the Log files and perform necessary cleanup tasks.
void	destroy() destroys the logger and removes its resources.
AccessMode	getAccessMode()
boolean	isClosed()
void	open(AccessMode accessMode) opens the logger with the specified ACCESS_MODE.
void	reopen(AccessMode accessMode) reopens the datalogger.
void	replay(ILogRecordReplayListener replay) the records a recovered from the format described in write(short, byte[][])
String	toString()
void	write(short type, byte[] record)
long	write(short type, byte[][] records) +-- length of records[0] +-- data of records[0] +-- length of records[1] +-- data of records[1] . . .

Methods inherited from class java.lang.Object

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

Constructor Detail

FileChannelDataLogger

public FileChannelDataLogger(File logFileAccess,
                             AccessMode aceessMode)
                      throws IOException

Opens a logger on base of die given logfile. A RandomAccessFile is created . The accessMode of the logger is AccessMode.WRITE, so you can start writting date

Parameters:

logFileAccess -

Throws:

IOException

Method Detail

getAccessMode

public AccessMode getAccessMode()

open

public void open(AccessMode accessMode)
          throws IOException

opens the logger with the specified ACCESS_MODE. If the logger isn't closed it is closed

Specified by:

open in interface IDataLogger

Parameters:

accessMode -

Throws:

IOException

See Also:

IDataLogger.reopen(org.csc.phynixx.loggersystem.logger.channellogger.AccessMode)

reopen

public void reopen(AccessMode accessMode)
            throws IOException

reopens the datalogger. It is assumed that the logger is open.

Specified by:

reopen in interface IDataLogger

Parameters:

accessMode -

Throws:

IOException

IllegalStateException - logger isn't open

write

public void write(short type,
                  byte[] record)
           throws IOException

Throws:

IOException

write

public long write(short type,
                  byte[][] records)
           throws IOException

    +-- length of records[0]
    +-- data of records[0]
    +-- length of records[1]
    +-- data of records[1]
    . . .

 

this format ensures that the record could be recovered

Specified by:

write in interface IDataLogger

Parameters:

type - a record type defined in LogRecordType.

records -

Returns:

the file position before writing the data

Throws:

IOException

close

public void close()
           throws IOException

Description copied from interface: IDataLogger

close the Log files and perform necessary cleanup tasks. The logger could be reopen

Specified by:

close in interface IDataLogger

Throws:

IOException

replay

public void replay(ILogRecordReplayListener replay)
            throws IOException

the records a recovered from the format described in write(short, byte[][])

Specified by:

replay in interface IDataLogger

Parameters:

replay - replayListener

Throws:

IOException

isClosed

public boolean isClosed()

Specified by:

isClosed in interface IDataLogger

Returns:

true if and if the logger is closed

destroy

public void destroy()
             throws IOException

Description copied from interface: IDataLogger

destroys the logger and removes its resources. The logger cannot be reopened

Specified by:

destroy in interface IDataLogger

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object