org.apache.log4j.varia
Class ExternallyRolledFileAppender

java.lang.Object
  org.apache.log4j.AppenderSkeleton
      org.apache.log4j.WriterAppender
          org.apache.log4j.FileAppender
              org.apache.log4j.RollingFileAppender
                  org.apache.log4j.varia.ExternallyRolledFileAppender

All Implemented Interfaces:

Appender, OptionHandler

public class ExternallyRolledFileAppender
extends RollingFileAppender

This appender listens on a socket on the port specified by the Port property for a "RollOver" message. When such a message is received, the underlying log file is rolled over and an acknowledgment message is sent back to the process initiating the roll over.

This method of triggering roll over has the advantage of being operating system independent, fast and reliable.

A simple application Roller is provided to initiate the roll over.

Note that the initiator is not authenticated. Anyone can trigger a rollover. In production environments, it is recommended that you add some form of protection to prevent undesired rollovers.

Since:

version 0.9.0

Author:

Ceki Gülcü

Field Summary

static String	OK The string constant sent to acknowledge a roll over.
static String	ROLL_OVER The string constant sent to initiate a roll over.

Fields inherited from class org.apache.log4j.RollingFileAppender

maxBackupIndex, maxFileSize

Fields inherited from class org.apache.log4j.FileAppender

bufferedIO, bufferSize, fileAppend, fileName

Fields inherited from class org.apache.log4j.WriterAppender

encoding, immediateFlush, qw

Fields inherited from class org.apache.log4j.AppenderSkeleton

closed, errorHandler, headFilter, layout, name, tailFilter, threshold

Constructor Summary

ExternallyRolledFileAppender()
The default constructor does nothing but calls its super-class constructor.

Method Summary

void	activateOptions() Start listening on the port specified by a preceding call to setPort(int).
int	getPort() Returns value of the Port option.
void	setPort(int port) The Port [roperty is used for setting the port for listening to external roll over messages.

Methods inherited from class org.apache.log4j.RollingFileAppender

getMaxBackupIndex, getMaximumFileSize, rollOver, setFile, setMaxBackupIndex, setMaxFileSize, setMaximumFileSize, setQWForFiles, subAppend

Methods inherited from class org.apache.log4j.FileAppender

closeFile, getAppend, getBufferedIO, getBufferSize, getFile, reset, setAppend, setBufferedIO, setBufferSize, setFile

Methods inherited from class org.apache.log4j.WriterAppender

append, checkEntryConditions, close, closeWriter, createWriter, getEncoding, getImmediateFlush, requiresLayout, setEncoding, setErrorHandler, setImmediateFlush, setWriter, shouldFlush, writeFooter, writeHeader

Methods inherited from class org.apache.log4j.AppenderSkeleton

addFilter, clearFilters, doAppend, finalize, getErrorHandler, getFilter, getFirstFilter, getLayout, getName, getThreshold, isAsSevereAsThreshold, setLayout, setName, setThreshold

Methods inherited from class java.lang.Object

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

Field Detail

ROLL_OVER

public static final String ROLL_OVER

The string constant sent to initiate a roll over. Current value of this string constant is RollOver.

See Also:

Constant Field Values

OK

public static final String OK

The string constant sent to acknowledge a roll over. Current value of this string constant is OK.

See Also:

Constant Field Values

Constructor Detail

ExternallyRolledFileAppender

public ExternallyRolledFileAppender()

The default constructor does nothing but calls its super-class constructor.

Method Detail

setPort

public void setPort(int port)

The Port [roperty is used for setting the port for listening to external roll over messages.

getPort

public int getPort()

Returns value of the Port option.

activateOptions

public void activateOptions()

Start listening on the port specified by a preceding call to setPort(int).

Specified by:

activateOptions in interface OptionHandler

Overrides:

activateOptions in class FileAppender