edu.mit.simile.tracer
Class Tracer

java.lang.Object
  org.apache.log4j.Layout
      edu.mit.simile.tracer.Tracer

All Implemented Interfaces:

org.apache.log4j.spi.OptionHandler

public class Tracer
extends org.apache.log4j.Layout

This is a special Log4j log formatter that is capable of reacting on special log messages and 'indent' the logs accordingly. This is very useful to visually inspect a debug log and see what calls what. An example of logs are "> method()" and "< method()" where > and < are used to indicate respectively "entering" and "exiting".

Field Summary

protected StringBuffer	buf
protected Calendar	calendar
protected static int	CONTEXT_SIZE
protected int	indentation
protected static long	MAX_DELTA
protected long	previousTime

Fields inherited from class org.apache.log4j.Layout

LINE_SEP, LINE_SEP_LEN

Constructor Summary

Tracer()

Method Summary

void	activateOptions()
String	format(org.apache.log4j.spi.LoggingEvent event)
boolean	ignoresThrowable()

Methods inherited from class org.apache.log4j.Layout

getContentType, getFooter, getHeader

Methods inherited from class java.lang.Object

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

Field Detail

CONTEXT_SIZE

protected static final int CONTEXT_SIZE

See Also:

Constant Field Values

MAX_DELTA

protected static final long MAX_DELTA

See Also:

Constant Field Values

buf

protected final StringBuffer buf

calendar

protected Calendar calendar

previousTime

protected long previousTime

indentation

protected int indentation

Constructor Detail

Tracer

public Tracer()

Method Detail

activateOptions

public void activateOptions()

format

public String format(org.apache.log4j.spi.LoggingEvent event)

Specified by:

format in class org.apache.log4j.Layout

ignoresThrowable

public boolean ignoresThrowable()

Specified by:

ignoresThrowable in class org.apache.log4j.Layout