Take a look at the ScriptAppenderSelector -
http://logging.apache.org/log4j/2.x/manual/appenders.html#ScriptAppenderSelector
<http://logging.apache.org/log4j/2.x/manual/appenders.html#ScriptAppenderSelector>
- and see if that does what you want. If not, please let us know.
Ralph
> On Oct 26, 2019, at 5:26 AM, Behrang Saeedzadeh <behran...@gmail.com> wrote:
>
> Let’s say I have three appenders:
>
> <?xml version="1.0" encoding="UTF-8"?><Configuration status="WARN">
> <Appenders>
> <Console name="Console" target="SYSTEM_OUT">
> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level
> %logger{36} - %msg%n"/>
> </Console>
>
> <File name="File" fileName="application.log">
> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level
> %logger{36} - %msg%n" />
> </File>
>
> <SMTP name="SMTP"
> subject="App: Error"
> from="lo...@example.com"
> to="supp...@example.com"
> smtpHost="mailserver"
> smtpPort="25"
> bufferSize="100">
> </SMTP>
> </Appenders></Configuration>
>
> I want to enable/disable these appenders using system properties in
> different environments.
>
> One option is to control this using scripts:
>
> <?xml version="1.0" encoding="UTF-8"?><Configuration status="WARN">
> <Scripts>
> <Script name="isConsoleAppenderEnabled" language="groovy"><![CDATA[
> return System.getProperty("CONSOLE_APPENDER_ENABLED",
> 'true').equalsIgnoreCase('true');
> ]]></Script>
>
> <Script name="isFileAppenderEnabled" language="groovy"><![CDATA[
> return System.getProperty("FILE_APPENDER_ENABLED",
> 'true').equalsIgnoreCase('true');
> ]]></Script>
>
> <Script name="isSmtpAppenderEnabled" language="groovy"><![CDATA[
> return System.getProperty("SMTP_APPENDER_ENABLED",
> 'true').equalsIgnoreCase('true');
> ]]></Script>
> </Scripts>
>
> <Appenders>
> <Console name="Console" target="SYSTEM_OUT">
> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level
> %logger{36} - %msg%n"/>
> </Console>
>
> <File name="File" fileName="application.log">
> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level
> %logger{36} - %msg%n" />
> </File>
>
> <SMTP name="SMTP"
> subject="App: Error"
> from="lo...@example.com"
> to="supp...@example.com"
> smtpHost="smtp.example.com"
> smtpPort="25"
> bufferSize="5">
> </SMTP>
> </Appenders>
>
> <Loggers>
> <Root level="info">
> <AppenderRef ref="Console">
> <ScriptFilter onMatch="ACCEPT" onMisMatch="DENY">
> <ScriptRef ref="isConsoleAppenderEnabled"/>
> </ScriptFilter>
> </AppenderRef>
>
> <AppenderRef ref="File">
> <ScriptFilter onMatch="ACCEPT" onMisMatch="DENY">
> <ScriptRef ref="isFileAppenderEnabled"/>
> </ScriptFilter>
> </AppenderRef>
>
> <AppenderRef ref="SMTP">
> <ScriptFilter onMatch="ACCEPT" onMisMatch="DENY">
> <ScriptRef ref="isSmtpAppenderEnabled"/>
> </ScriptFilter>
> </AppenderRef>
> </Root>
> </Loggers></Configuration>
>
> However, this doesn’t really disable the appender, but computes the value
> of the script for each log event and based on that suppresses the event
> from being sent to the appender.
>
> Another option is to write a custom appender that implements this logic and
> that can decorate other appenders to achieve this behavior.
>
> But I was wondering if there’s already a built-in feature available that
> can enable/disable appenders based on environment variables and/or system
> properties?
>
>
> Best regards,
> Behrang Saeedzadeh
> blog.behrang.org
