Logging Logback-access messages via another logger

AccessLogToMainLogAppender.java

package net._95point2.common.logging;

import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;

import ch.qos.logback.access.spi.IAccessEvent;
import ch.qos.logback.core.OutputStreamAppender;
import ch.qos.logback.core.encoder.Encoder;
import ch.qos.logback.core.encoder.LayoutWrappingEncoder;
import ch.qos.logback.core.status.Status;
import ch.qos.logback.core.status.StatusListener;

public abstract class AccessLogToMainLogAppender extends OutputStreamAppender<IAccessEvent> implements StatusListener
{
	private Charset charset = Charset.defaultCharset();
	
	public abstract void log(String msg);
	public abstract void status(Status status);
	
	@Override
	public void start() {
		setOutputStream(new FakeStringBufferOutputStream());
		super.start();
	}
	
	@Override
	public void addStatusEvent(Status status) {
		status(status);
	}
	
	@Override
	public void doAppend(IAccessEvent eventObject) {
		/* synchronized, and relying on the immediateFlush=true property of the encoder to do:
		 * 1. write(byte[])
		 * 2. followed by a flush() 
		 * which gives us a single logging statement from our fake OutputStream
		 */
		synchronized (this) {
			super.doAppend(eventObject);
		}
	}
	
	@Override
	public void setEncoder(Encoder<IAccessEvent> encoder) {
		if(encoder instanceof LayoutWrappingEncoder){
			LayoutWrappingEncoder<IAccessEvent> lwe = (LayoutWrappingEncoder<IAccessEvent>) encoder;
			Charset charset = lwe.getCharset();
			if(charset != null){
				this.charset = charset;
			}
			lwe.setImmediateFlush(true);
		}
		else {
			throw new IllegalArgumentException("Only supports Encoders that extend LayoutWrappingEncoder as we need the immediateflush behaviour");
		}
		super.setEncoder(encoder);
	}
	
	public class FakeStringBufferOutputStream extends OutputStream
	{
		StringBuilder sb = new StringBuilder();
		
		@Override
		public void flush() throws IOException {
			AccessLogToMainLogAppender.this.log(sb.toString());
			sb.delete(0, sb.length());
		}
		@Override
		public void write(byte[] bytes) throws IOException {
			sb.append(new String(bytes, AccessLogToMainLogAppender.this.charset));
		}
		
		@Override
		public void write(int b) throws IOException {
			throw new UnsupportedOperationException("Only supports write(byte[] bytes)");
		}
		
		@Override
		public void write(byte[] b, int off, int len) throws IOException {
			throw new UnsupportedOperationException("Only supports write(byte[] bytes)");
		}
	}
}

LICENSE.txt

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.

In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to <http://unlicense.org/>

logback-access.xml

<configuration>
    <appender name="BRIDGE" class="net._95point2.common.logging.LogbackAccessLogAdapter">
        <encoder>
            <pattern>req=%U%q method=%m user=%u status=%s size=%b time=%D session=%S referer=%header{Referer} browser=%header{User-Agent} ip=%a</pattern>
        </encoder>
    </appender>
    <appender-ref ref="BRIDGE" />
</configuration>

LogbackAccessLogAdapter.java

package net._95point2.common.logging;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import ch.qos.logback.access.spi.IAccessEvent;
import ch.qos.logback.core.filter.Filter;
import ch.qos.logback.core.spi.FilterReply;
import ch.qos.logback.core.status.Status;

public class LogbackAccessLogAdapter extends AccessLogToMainLogAppender
{
	Logger logger = LoggerFactory.getLogger("RequestLog");
	
	@Override
	public void log(String msg) {
		logger.info(msg);
	}

	@Override
	public void status(Status status) {
		logger.error("{}", status, new Throwable());
	}
	
	public LogbackAccessLogAdapter() {
		addFilter(new Filter<IAccessEvent>() {
			
			@Override
			public FilterReply decide(IAccessEvent event) {
				if(event.getRequestURI().startsWith("/static")){
					return FilterReply.DENY;
				}
				else {
					return FilterReply.NEUTRAL;
				}
			}
		});
	}
}