package ch.qos.logback.classic.layout;

import ch.qos.logback.classic.pattern.ThrowableProxyConverter;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.classic.spi.IThrowableProxy;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.LayoutBase;
import ch.qos.logback.core.util.CachingDateFormatter;

A layout with a fixed format. The output is equivalent to that produced by PatternLayout with the pattern:

%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
TTLLLayout has the advantage of faster load time whereas PatternLayout requires roughly 40 milliseconds to load its parser classes. Note that the second run of PatternLayout will be much much faster (approx. 10 micro-seconds).
Fixed format layouts such as TTLLLayout should be considered as an alternative to PatternLayout only if the extra 40 milliseconds at application start-up is considered significant.
Author:
Ceki Gülcü
Since:
1.1.6/**
 * A layout with a fixed format. The output is equivalent to that produced by {@link ch.qos.logback.classic.PatternLayout PatternLayout} with the pattern:</p>
 * 
 * <pre>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pre>
 * 
 *<p>TTLLLayout has the advantage of faster load time whereas {@link ch.qos.logback.classic.PatternLayout PatternLayout}
 * requires roughly 40 milliseconds to load its parser classes.  Note that the second run of PatternLayout will be much much faster (approx. 10 micro-seconds).</p>
 * 
 * <p>Fixed format layouts such as TTLLLayout should be considered as an alternative to PatternLayout only if the extra 40 milliseconds at application start-up is considered significant.</p>
 * 
 * @author Ceki G&uuml;lc&uuml;
 * @since 1.1.6
 */
public class TTLLLayout extends LayoutBase<ILoggingEvent> {

    CachingDateFormatter cachingDateFormatter = new CachingDateFormatter("HH:mm:ss.SSS");
    ThrowableProxyConverter tpc = new ThrowableProxyConverter();

    @Override
    public void start() {
        tpc.start();
        super.start();
    }

    @Override
    public String doLayout(ILoggingEvent event) {
        if (!isStarted()) {
            return CoreConstants.EMPTY_STRING;
        }
        StringBuilder sb = new StringBuilder();

        long timestamp = event.getTimeStamp();

        sb.append(cachingDateFormatter.format(timestamp));
        sb.append(" [");
        sb.append(event.getThreadName());
        sb.append("] ");
        sb.append(event.getLevel().toString());
        sb.append(" ");
        sb.append(event.getLoggerName());
        sb.append(" - ");
        sb.append(event.getFormattedMessage());
        sb.append(CoreConstants.LINE_SEPARATOR);
        IThrowableProxy tp = event.getThrowableProxy();
        if (tp != null) {
            String stackTrace = tpc.convert(event);
            sb.append(stackTrace);
        }
        return sb.toString();
    }

}