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https://issues.apache.org/jira/browse/LOG4J2-486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13864089#comment-13864089
]
Joe Merten commented on LOG4J2-486:
-----------------------------------
Yep, {{packages="eeo.toolbox"}} was the trick to get my factory method called
:).
Now I'm able to write to the bottom of the old as well as to the top of the new
logfile using a simple FileWriter like this:
{code:borderStyle=solid}
static class MyAction implements Action {
final Action delegate;
final String fileName;
public MyAction(final Action delegate, final String fileName) {
this.delegate = delegate;
this.fileName = fileName;
}
@Override public void run() {
delegate.run();
}
@Override public boolean execute() throws IOException {
try {
BufferedWriter writer = null;
try {
writer = new BufferedWriter(new FileWriter(new
File(fileName), true));
writer.write("****************************\n");
writer.write("*** Bye, bye old logfile ***\n");
writer.write("****************************\n");
} finally {
if (writer != null)
writer.close();
}
} catch (Throwable e) {
logger.error("Writing to bottom of old logfile \"" + fileName +
"\" with", e);
}
boolean ret = delegate.execute();
try {
BufferedWriter writer = null;
try {
writer = new BufferedWriter(new FileWriter(new
File(fileName), true));
writer.write("*************************\n");
writer.write("*** Hello new logfile ***\n");
writer.write("*************************\n");
} finally {
if (writer != null)
writer.close();
}
} catch (Throwable e) {
logger.error("Writing to top of new logfile \"" + fileName +
"\" with", e);
}
return ret;
}
{code}
{color:gray} ( … but I think my solution will not longer work as soon as
[#239|LOG4J2-239] is implemented, so I'll be happy if there was a appropriate
callback provided in future versions … ) {color}
Could you give me a hint how I can use the configured PatternLayout to write to
the logfiles?
> RollingFile Appender - add custom info at the start of each logfile
> -------------------------------------------------------------------
>
> Key: LOG4J2-486
> URL: https://issues.apache.org/jira/browse/LOG4J2-486
> Project: Log4j 2
> Issue Type: Question
> Components: Appenders
> Affects Versions: 2.0-beta9
> Environment: Java 1.7, Linux
> Reporter: Joe Merten
> Attachments: MyRolloverStrategy.java, log4j2.xml
>
>
> I post this question here because of a hint of Remko Popma.
> See also:
> *
> http://apache-logging.6191.n7.nabble.com/log4j2-getting-started-amp-rolling-files-tt8406.html#a42402
> *
> http://stackoverflow.com/questions/20819376/log4j2-rollingfile-appender-add-custom-info-at-the-start-of-each-logfile
> I want to add some custom info at the top of each logfile, like the version
> string of my application, the application uptime and the system uptime. And
> even writing some »bye, bye / eof« to the bottom of the just closed logfile
> would also be fine.
> Because there is no appropriate hook or callback to get notified when the
> RollingFileAppander is creating / has created a new file, so that I can put
> my things at first into these new logfile, I tried to extend
> DefaultRolloverStrategy. But currently, I stuck at some points.
> Seems that I have to deal with {{@Plugin}} and {{@PluginFactory}}. My try
> with the attached log4j2.xml and MyRolloverStrategy.java compiles without
> errors and warnings. But when I start the application, I get this error
> message:
> {{2014-01-05 23:22:05,876 ERROR RollingFile contains an invalid element or
> attribute "MyRolloverStrategy"}}
> And then the next step would be: "how to write to the logfiles within my
> rollover method?"
> log4j2.xml :
> {code}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration>
> <Properties>
> <Property name="projectPrefix">Tts</Property>
> <Property name="rawPattern">%d %-5p [%t] %C{2} (%F:%L) - %m%n</Property>
> <Property name="coloredPattern">%d %highlight{%-5p}{FATAL=bright red,
> ERROR=red, WARN=yellow, INFO=cyan, DEBUG=green, TRACE=bright blue}
> %style{[%t] %C{2} (%F:%L) -}{bright,black} %m%n</Property>
> <Property name="coloredShortPattern">%d %highlight{%-5p}{FATAL=bright
> red, ERROR=red, WARN=yellow, INFO=cyan, DEBUG=green, TRACE=bright blue}
> %style{[%t] -}{bright,black} %m%n</Property>
> <Property name="fileName">Log/${projectPrefix}.log</Property>
> <Property name="filePattern">Log/${projectPrefix}-%i.log</Property>
> </Properties>
> <Appenders>
> <Console name="Stdout" target="SYSTEM_OUT">
> <PatternLayout pattern="${coloredPattern}"/>
> </Console>
> <RollingFile name="Logfile" fileName="${fileName}"
> filePattern="${filePattern}">
> <PatternLayout pattern="${rawPattern}"/>
> <Policies>
> <SizeBasedTriggeringPolicy size="16 MB"/>
> </Policies>
> <eeo.toolbox.MyRolloverStrategy fileIndex="min" max="16"/>
> </RollingFile>
> </Appenders>
> <Loggers>
> <Root level="info">
> <AppenderRef ref="Stdout"/>
> <AppenderRef ref="Logfile"/>
> </Root>
> </Loggers>
> </Configuration>
> {code}
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