Re: [logback-user] Can I have level specific patterns?

15 Apr 2015

      SWEET!

thanks Ceki. My guess is other people will want to do the same thing. bellow is my working code. 

background. I have a CLI java application. I want to generate all output using logger instead of System.out or System.error. I want logger.info() to be un decorated. All other levels of logging should level, class and line #

Thanks

Andy

public class DebugConverter extends CompositeConverter<ILoggingEvent> {

    public DebugConverter() {
        // TODO Auto-generated constructor stub
    }

    @Override
    protected String transform(ILoggingEvent event, String in) {
        if (Level.INFO == event.getLevel()) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        sb.append(in);
        String ret =  sb.toString();
        return ret;
    }
}

<configuration>
	<conversionRule conversionWord="AST_DEBUG" 
                  converterClass="com.apple.ast.logging.converter.DebugConverter" />

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%AST_DEBUG(%-5level [%class{16}] [line:%L]) %m%n</pattern>
        </encoder>
    </appender>

    <root level="DEBUG">
        <appender-ref ref="STDOUT" />
    </root>
</configuration>

    @Test
    public void testLogger() {
        logger.debug("debug {}", "testLogger");
        logger.info("info {}", "testLogger");
        logger.warn("warn {}", "testLogger");
        logger.error("error {}", "testLogger");
    }

generates following output

DEBUG [c.a.a.CustomDelimitedFileSourceTest] [line:120] debug testLogger
 info testLogger
WARN  [c.a.a.CustomDelimitedFileSourceTest] [line:122] warn testLogger
ERROR [c.a.a.CustomDelimitedFileSourceTest] [line:123] error testLogger
...
On Apr 15, 2015, at 3:23 AM, Ceki Gülcü <ceki@qos.ch> wrote:
Hi Andy,
When you write "%a(%x %y)" then %x and %y are child converters for %a. So, in the case of "%debug(%level %d %t)", the converters %level,%d and %t are children of %debug. %debug is said to be a composite converter and the parenthesis () is sort of a composition operator.
For your particular case, you need to sub-class CompositeConverter. See the implementation for HighlightingCompositeConverter (and ForegroundCompositeConverterBase). Look at the code for CompositeConverter ND notice how the convert() method of CompositeConverter delegates to child converters and only at the end transforms the results.
I hope this helps,
--
Ceki
On 4/15/2015 3:12, Andrew E. Davidson wrote:
...
Hi Ceki
...
Alternatively, you could write a custom conversion specifier. If you
had a specifier called %debug which output contents only for level
DEBUG, and a %warn specifier which output contents only for level WARN
and another specifier %ERROR which output contents for ERROR, your
pattern could be written as
%debug(%level %d %t) %error(%level) %info(%level) %m%n
See http://logback.qos.ch/manual/layouts.html#customConversionSpecifier
for documentation on this topic.
I tried your “custom conversion specifier” approach. I think I am
missing something. In your logback.xml it looks like you are able to
pass arguments. I used a debugger how ever it did not appear like the
the ILoggingEvent had anything particularly useful other then the level
and thread Name values. List<String> optionList= getOptionList(); gives
me [%level %d %t] how ever the values have not been expanded
Your solution is very close to what I want to do.
Thanks in advance
Andy
public class DebugConverter extends ClassicConverter {
public DebugConverter() {
// TODO Auto-generated constructor stub
    }
@Override
public String convert(ILoggingEvent event) {
List<String> optionList = getOptionList();
Levellevel=event.getLevel();
        System.err.println("convert() level:" + level);
return"DebugConverter.convert()";
    }
}
<configuration>
<conversionRuleconversionWord="AST_DEBUG"
converterClass="com.apple.ast.logging.converter.DebugConverter"/>
<appendername="STDOUT"class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<!--
            <pattern>%-5level %date{HH:mm:ss,SSS} [%thread]
[%class{16}] [line:%L] %msg%n</pattern>
            -->
<pattern>%AST_DEBUG{%level %d %t}  %m%n</pattern>
</encoder>
</appender>
<rootlevel="DEBUG">
<appender-refref="STDOUT"/>
</root>
</configuration>

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