org.apache.log4j
Class TTCCLayout

java.lang.Object
  org.apache.log4j.Layout
      org.apache.log4j.helpers.DateLayout
          org.apache.log4j.TTCCLayout

All Implemented Interfaces:

OptionHandler

public class TTCCLayout
extends DateLayout

TTCC layout format consists of time, thread, category and nested diagnostic context information, hence the name.

Each of the four fields can be individually enabled or disabled. The time format depends on the DateFormat used.

Here is an example TTCCLayout output with the RelativeTimeDateFormat.

176 [main] INFO  org.apache.log4j.examples.Sort - Populating an array of 2 elements in reverse order.
225 [main] INFO  org.apache.log4j.examples.SortAlgo - Entered the sort method.
262 [main] DEBUG org.apache.log4j.examples.SortAlgo.OUTER i=1 - Outer loop.
276 [main] DEBUG org.apache.log4j.examples.SortAlgo.SWAP i=1 j=0 - Swapping intArray[0] = 1 and intArray[1] = 0
290 [main] DEBUG org.apache.log4j.examples.SortAlgo.OUTER i=0 - Outer loop.
304 [main] INFO  org.apache.log4j.examples.SortAlgo.DUMP - Dump of interger array:
317 [main] INFO  org.apache.log4j.examples.SortAlgo.DUMP - Element [0] = 0
331 [main] INFO  org.apache.log4j.examples.SortAlgo.DUMP - Element [1] = 1
343 [main] INFO  org.apache.log4j.examples.Sort - The next log statement should be an error message.
346 [main] ERROR org.apache.log4j.examples.SortAlgo.DUMP - Tried to dump an uninitialized array.
        at org.apache.log4j.examples.SortAlgo.dump(SortAlgo.java:58)
        at org.apache.log4j.examples.Sort.main(Sort.java:64)
467 [main] INFO  org.apache.log4j.examples.Sort - Exiting main method.

The first field is the number of milliseconds elapsed since the start of the program. The second field is the thread outputting the log statement. The third field is the level, the fourth field is the category to which the statement belongs.

The fifth field (just before the '-') is the nested diagnostic context. Note the nested diagnostic context may be empty as in the first two statements. The text after the '-' is the message of the statement.

WARNING Do not use the same TTCCLayout instance from within different appenders. The TTCCLayout is not thread safe when used in his way. However, it is perfectly safe to use a TTCCLayout instance from just one appender.

PatternLayout offers a much more flexible alternative.

Author:

Ceki Gülcü, Heinz Richter

Field Summary

protected StringBuffer

buf

Fields inherited from class org.apache.log4j.helpers.DateLayout

date, DATE_FORMAT_OPTION, dateFormat, NULL_DATE_FORMAT, pos, RELATIVE_TIME_DATE_FORMAT, TIMEZONE_OPTION

Fields inherited from class org.apache.log4j.Layout

LINE_SEP, LINE_SEP_LEN

Constructor Summary

TTCCLayout()
Instantiate a TTCCLayout object with RelativeTimeDateFormat as the date formatter in the local time zone.

TTCCLayout(String dateFormatType)
Instantiate a TTCCLayout object using the local time zone.

Method Summary

String	format(LoggingEvent event) In addition to the level of the statement and message, the returned byte array includes time, thread, category and NDC information.
boolean	getCategoryPrefixing() Returns value of the CategoryPrefixing option.
boolean	getContextPrinting() Returns value of the ContextPrinting option.
boolean	getThreadPrinting() Returns value of the ThreadPrinting option.
boolean	ignoresThrowable() The TTCCLayout does not handle the throwable contained within LoggingEvents.
void	setCategoryPrefixing(boolean categoryPrefixing) The CategoryPrefixing option specifies whether Category name is part of log output or not.
void	setContextPrinting(boolean contextPrinting) The ContextPrinting option specifies log output will include the nested context information belonging to the current thread.
void	setThreadPrinting(boolean threadPrinting) The ThreadPrinting option specifies whether the name of the current thread is part of log output or not.

Methods inherited from class org.apache.log4j.helpers.DateLayout

activateOptions, dateFormat, getDateFormat, getOptionStrings, getTimeZone, setDateFormat, setDateFormat, setDateFormat, setOption, setTimeZone

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

buf

protected final StringBuffer buf

Constructor Detail

TTCCLayout

public TTCCLayout()

Instantiate a TTCCLayout object with RelativeTimeDateFormat as the date formatter in the local time zone.

Since:

0.7.5

TTCCLayout

public TTCCLayout(String dateFormatType)

Instantiate a TTCCLayout object using the local time zone. The DateFormat used will depend on the dateFormatType.

This constructor just calls the DateLayout.setDateFormat(java.lang.String) method.

Method Detail

setThreadPrinting

public void setThreadPrinting(boolean threadPrinting)

The ThreadPrinting option specifies whether the name of the current thread is part of log output or not. This is true by default.

getThreadPrinting

public boolean getThreadPrinting()

Returns value of the ThreadPrinting option.

setCategoryPrefixing

public void setCategoryPrefixing(boolean categoryPrefixing)

The CategoryPrefixing option specifies whether Category name is part of log output or not. This is true by default.

getCategoryPrefixing

public boolean getCategoryPrefixing()

Returns value of the CategoryPrefixing option.

setContextPrinting

public void setContextPrinting(boolean contextPrinting)

The ContextPrinting option specifies log output will include the nested context information belonging to the current thread. This is true by default.

getContextPrinting

public boolean getContextPrinting()

Returns value of the ContextPrinting option.

format

public String format(LoggingEvent event)

In addition to the level of the statement and message, the returned byte array includes time, thread, category and NDC information.

Time, thread, category and diagnostic context are printed depending on options.

Specified by:

format in class Layout

Parameters:

event - The event to format

ignoresThrowable

public boolean ignoresThrowable()

The TTCCLayout does not handle the throwable contained within LoggingEvents. Thus, it returns true.

Specified by:

ignoresThrowable in class Layout

Since:

version 0.8.4