uk.ac.ic.doc.automed.util
Class LogOutputHandler

java.lang.Object
  uk.ac.ic.doc.automed.util.LogOutputHandler

public class LogOutputHandler
extends java.lang.Object

LogOutputHandler.java

Author:

Duc M Le dmle@doc.ic.ac.uk Created on 01 August 2006 Department of Computing, Imperial College

Field Summary

private boolean	_append
private java.io.ByteArrayOutputStream	_bout
private java.io.PrintStream	_console
private java.io.FileWriter	_errFile
private long	_errLogFileSize
private java.io.FileWriter	_file
private int	_handlerType the handler type
private long	_logFileSize
private java.io.PrintWriter	_peFile
private java.io.PrintWriter	_pFile
static int	CONSOLE Print log messages to std output only
static java.lang.String	ERROR_LOG_FILE
static int	FILE Print log messages to file
static java.lang.String	LOG_FILE
private static long	MAX_ERROR_LOG_SIZE
private static long	MAX_LOG_SIZE
static int	MEMORY Print log messages to a given byte array
static int	REMOTE Print log messages to a log server

Constructor Summary

LogOutputHandler(int handlerType)
Creates a new instance of LogHandler Set default value of append to true

LogOutputHandler(int handlerType, boolean append)
Creates a new instance of LogHandler

Method Summary

private void	createWriters(java.lang.String file) Prepare writers
java.io.PrintStream	getConsole()
protected int	getHandlerType() return the log handler type
private java.lang.String	getLogString(java.lang.String[] logElements) Format a record log for writing
java.lang.String	getMemoryLog() Only used when log handler type is set to MEMORY
static void	main(java.lang.String[] args)
private void	monitorFile(java.lang.String file) Check if file sizes have grown over the limits
void	output(java.lang.String[] logElements) Write log message to normal log file.
private void	outputConsole(java.lang.String ls, java.lang.Throwable t)
void	outputError(java.lang.String[] logElements, java.lang.Throwable t) Write errors to error log file.
private void	readInitSizes() Read file sizes
void	setConsole(java.io.PrintStream ps)

Methods inherited from class java.lang.Object

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

Field Detail

_handlerType

private int _handlerType

the handler type

CONSOLE

public static final int CONSOLE

Print log messages to std output only

See Also:

Constant Field Values

FILE

public static final int FILE

Print log messages to file

See Also:

Constant Field Values

REMOTE

public static final int REMOTE

Print log messages to a log server

See Also:

Constant Field Values

MEMORY

public static final int MEMORY

Print log messages to a given byte array

See Also:

Constant Field Values

LOG_FILE

public static final java.lang.String LOG_FILE

ERROR_LOG_FILE

public static final java.lang.String ERROR_LOG_FILE

MAX_LOG_SIZE

private static final long MAX_LOG_SIZE

See Also:

Constant Field Values

MAX_ERROR_LOG_SIZE

private static final long MAX_ERROR_LOG_SIZE

See Also:

Constant Field Values

_console

private java.io.PrintStream _console

_file

private java.io.FileWriter _file

_errFile

private java.io.FileWriter _errFile

_pFile

private java.io.PrintWriter _pFile

_peFile

private java.io.PrintWriter _peFile

_append

private boolean _append

_bout

private java.io.ByteArrayOutputStream _bout

_logFileSize

private long _logFileSize

_errLogFileSize

private long _errLogFileSize

Constructor Detail

LogOutputHandler

public LogOutputHandler(int handlerType)

Creates a new instance of LogHandler Set default value of append to true

LogOutputHandler

public LogOutputHandler(int handlerType,
                        boolean append)

Creates a new instance of LogHandler

Method Detail

setConsole

public void setConsole(java.io.PrintStream ps)

getConsole

public java.io.PrintStream getConsole()

readInitSizes

private void readInitSizes()

Read file sizes

createWriters

private void createWriters(java.lang.String file)
                    throws java.io.IOException

Prepare writers

Throws:

java.io.IOException

monitorFile

private void monitorFile(java.lang.String file)

Check if file sizes have grown over the limits

output

public void output(java.lang.String[] logElements)

Write log message to normal log file. It also monitors the file's growth.

outputError

public void outputError(java.lang.String[] logElements,
                        java.lang.Throwable t)

Write errors to error log file. It also monitors the file's growth.

getMemoryLog

public java.lang.String getMemoryLog()

Only used when log handler type is set to MEMORY

outputConsole

private void outputConsole(java.lang.String ls,
                           java.lang.Throwable t)

getLogString

private java.lang.String getLogString(java.lang.String[] logElements)

Format a record log for writing

getHandlerType

protected int getHandlerType()

return the log handler type

main

public static void main(java.lang.String[] args)