com.papertrailapp.logback.Syslog4jAppender Maven / Gradle / Ivy

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Logback appender using syslog4j to send via syslog
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package com.papertrailapp.logback;

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.classic.util.LevelToSyslogSeverity;
import ch.qos.logback.core.AppenderBase;
import ch.qos.logback.core.Layout;
import org.productivity.java.syslog4j.SyslogConfigIF;
import org.productivity.java.syslog4j.SyslogIF;
import org.productivity.java.syslog4j.SyslogRuntimeException;

public class Syslog4jAppender extends AppenderBase {
    SyslogIF syslog;
    SyslogConfigIF syslogConfig;
    Layout layout;

    @Override
    protected void append(E loggingEvent) {
        syslog.log(getSeverityForEvent(loggingEvent), layout.doLayout(loggingEvent));
   }

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

        synchronized (this) {
            try {
                Class syslogClass = syslogConfig.getSyslogClass();
                syslog = (SyslogIF) syslogClass.newInstance();

                syslog.initialize(syslogClass.getSimpleName(), syslogConfig);
            } catch (ClassCastException cse) {
                throw new SyslogRuntimeException(cse);
            } catch (IllegalAccessException iae) {
                throw new SyslogRuntimeException(iae);
            } catch (InstantiationException ie) {
                throw new SyslogRuntimeException(ie);
            }
        }
    }

    @Override
    public void stop() {
        super.stop();

        synchronized(this) {
            if (syslog != null) {
                syslog.shutdown();
                syslog = null;
            }
        }
    }

    /**
     * Convert a level to equivalent syslog severity. Only levels for printing
     * methods i.e DEBUG, WARN, INFO and ERROR are converted.
     *
     * @see ch.qos.logback.core.net.SyslogAppenderBase#getSeverityForEvent(java.lang.Object)
     */
    public int getSeverityForEvent(Object eventObject) {
        if (eventObject instanceof ILoggingEvent) {
            ILoggingEvent event = (ILoggingEvent) eventObject;
            return LevelToSyslogSeverity.convert(event);
        } else {
            return SyslogIF.LEVEL_INFO;
        }
    }

    public SyslogConfigIF getSyslogConfig() {
        return syslogConfig;
    }

    public void setSyslogConfig(SyslogConfigIF syslogConfig) {
        this.syslogConfig = syslogConfig;
    }

    public Layout getLayout() {
        return layout;
    }

    public void setLayout(Layout layout) {
        this.layout = layout;
    }
}