HTTPClient
Class Log

java.lang.Object
  |
  +--HTTPClient.Log

public class Log

extends Object

This is a simple logger for the HTTPClient. It defines a number of "facilities", each representing one or more logically connected classes. Logging can be enabled or disabled on a per facility basis. Furthermore, the logging output can be redirected to any desired place, such as a file or a buffer; by default all logging goes to System.err.

All log entries are preceded by the name of the currently executing thread, enclosed in {}'s, and the current time in hours, minutes, seconds, and milliseconds, enclosed in []'s. Example: {Thread-5} [20:14:03.244] Conn: Sending Request

When the class is loaded, two java system properties are read: HTTPClient.log.file and HTTPClient.log.mask. The first one, if set, causes all logging to be redirected to the file with the given name. The second one, if set, is used for setting which facilities are enabled; the value must be the bitwise OR ('|') of the values of the desired enabled facilities. E.g. a value of 3 would enable logging for the HTTPConnection and HTTPResponse, a value of 16 would enable cookie related logging, and a value of 8 would enable authorization related logging; a value of -1 would enable logging for all facilities. By default logging is disabled.

Since:

V0.3-3

Version:

0.3-3 06/05/2001

Author:

Ronald Tschalär

Field Summary

static int	ALL All the facilities - for use in setLogging (-1)
static int	AUTH The Authorization facility (8)
static int	CONN The HTTPConnection facility (1)
static int	COOKI The Cookies facility (16)
static int	DEMUX The StreamDemultiplexor facility (4)
static int	MODS The Modules facility (32)
static int	RESP The HTTPResponse facility (2)
static int	SOCKS The Socks facility (64)
static int	URLC The ULRConnection facility (128)

Method Summary

static boolean	isEnabled(int facility) Check whether logging for the given facility is enabled or not.
static void	setLogging(int facilities, boolean enable) Enable or disable logging for the given facilities.
static void	setLogWriter(Writer log, boolean closeWhenDone) Set the writer to which to log.
static void	write(int facility, String msg) Write the given message to the current log if logging for the given facility is enabled.
static void	write(int facility, String prefix, ByteArrayOutputStream buf) Write the contents of the given buffer to the current log if logging for the given facility is enabled.
static void	write(int facility, String prefix, Throwable t) Write the stack trace of the given exception to the current log if logging for the given facility is enabled.

Methods inherited from class java.lang.Object

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

Field Detail

CONN

public static final int CONN

The HTTPConnection facility (1)

RESP

public static final int RESP

The HTTPResponse facility (2)

DEMUX

public static final int DEMUX

The StreamDemultiplexor facility (4)

AUTH

public static final int AUTH

The Authorization facility (8)

COOKI

public static final int COOKI

The Cookies facility (16)

MODS

public static final int MODS

The Modules facility (32)

SOCKS

public static final int SOCKS

The Socks facility (64)

URLC

public static final int URLC

The ULRConnection facility (128)

ALL

public static final int ALL

All the facilities - for use in setLogging (-1)

Method Detail

write

public static void write(int facility,
                         String msg)

Write the given message to the current log if logging for the given facility is enabled.

Parameters:

facility - the facility which is logging the message

msg - the message to log

write

public static void write(int facility,
                         String prefix,
                         Throwable t)

Write the stack trace of the given exception to the current log if logging for the given facility is enabled.

Parameters:

facility - the facility which is logging the message

prefix - the string with which to prefix the stack trace; may be null

t - the exception to log

write

public static void write(int facility,
                         String prefix,
                         ByteArrayOutputStream buf)

Write the contents of the given buffer to the current log if logging for the given facility is enabled.

Parameters:

facility - the facility which is logging the message

prefix - the string with which to prefix the buffer contents; may be null

buf - the buffer to dump

isEnabled

public static boolean isEnabled(int facility)

Check whether logging for the given facility is enabled or not.

Parameters:

facility - the facility to check

Returns:

true if logging for the given facility is enable; false otherwise

setLogging

public static void setLogging(int facilities,
                              boolean enable)

Enable or disable logging for the given facilities.

Parameters:

facilities - the facilities for which to enable or disable logging. This is bitwise OR ('|') of all the desired facilities; use ALL to affect all facilities

enable - if true, enable logging for the chosen facilities; if false, disable logging for them.

setLogWriter

public static void setLogWriter(Writer log,
                                boolean closeWhenDone)

Set the writer to which to log. By default, things are logged to System.err.

Parameters:

log - the writer to log to; if null, nothing is changed

closeWhenDone - if true, close this stream when a new stream is set again