com.sleepycat.utilint

Class StatLogger

java.lang.Object

com.sleepycat.utilint.StatLogger

public class StatLogger
extends Object

Constructor Summary

Constructors

Constructor and Description
StatLogger(File logdir, String filename, String fileext, int filecount, int rowcount) StatLogger is used to write to a log file that contain a header followed by a set of data rows.

Method Summary

Modifier and Type	Method and Description
void	log(String val) log writes the string to the log file.
void	logDelta(String val) logDelta writes the string if the string is different than the last written log record.
void	setFileCount(int filecount) Set the maximum number of log files to keep after rotation.
void	setHeader(String val) Sets the log file header.
void	setRowCount(int rowcount) Sets the maximum log file row count.

Methods inherited from class java.lang.Object

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

Constructor Detail

StatLogger

public StatLogger(File logdir,
                  String filename,
                  String fileext,
                  int filecount,
                  int rowcount)
           throws IOException

StatLogger is used to write to a log file that contain a header followed by a set of data rows. Parameters control the size and number of rotating log files used. For a rotating set of files, as each file reaches a given size limit, it is closed, rotated out, and a new file opened. The name of the log file is filename.fileext. Successively older files are named by adding "0", "1", "2", etc into the file name. The format is filename.[version number].fileext.

Parameters:

logdir - Log file directory.

filename - Name of the log file.

fileext - Extent of the log file.

filecount - Maximum number of rotating log files to be saved.

rowcount - Maximum number of rows in a log file.

Throws:

IOException - if log file or directory cannot be accessed.

IllegalArgumentException - if the log directory is not a directory or if the log file is not a file.

Method Detail

setRowCount

public void setRowCount(int rowcount)

Sets the maximum log file row count.

Parameters:

rowcount - The maximum number of rows per log file.

setFileCount

public void setFileCount(int filecount)

Set the maximum number of log files to keep after rotation.

Parameters:

filecount - The maximum number of log files to keep.

setHeader

public void setHeader(String val)
               throws IOException

Sets the log file header. A new log file may be created if the header does not match the header in the existing file.

Parameters:

val - Header row data.

Throws:

IOException

log

public void log(String val)
         throws IOException

log writes the string to the log file.

Parameters:

val - Value to write to the log.

Throws:

IOException

logDelta

public void logDelta(String val)
              throws IOException

logDelta writes the string if the string is different than the last written log record. The first column is ignored when checking for a difference (current implementation has the time the record is logged as the first column.

Parameters:

val - value write to the log.

Throws:

IOException