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Tomcat9 Slf4j Logback Integration

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/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package org.apache.juli.logging.ch.qos.logback.classic.pattern;

import org.apache.juli.logging.ch.qos.logback.classic.spi.ILoggingEvent;
import org.apache.juli.logging.ch.qos.logback.core.CoreConstants;

/**
 * Return the event's sequence number.
 * 
 * @author Bertrand Renuart
 * @since 1.3.0
 */
public class SequenceNumberConverter extends ClassicConverter {

	@Override
	public void start() {
		if(getContext() == null) {
			// this should not happen
			return;
		}

		if (getContext().getSequenceNumberGenerator() == null) {
			addWarn("It looks like no  was defined in Logback configuration.");
		}
		super.start();
	}
	
	
	@Override
    public String convert(ILoggingEvent event) {
 		return Long.toString(event.getSequenceNumber());
   }

}