001/**
002 * Logback: the reliable, generic, fast and flexible logging framework.
003 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
004 *
005 * This program and the accompanying materials are dual-licensed under
006 * either the terms of the Eclipse Public License v1.0 as published by
007 * the Eclipse Foundation
008 *
009 *   or (per the licensee's choosing)
010 *
011 * under the terms of the GNU Lesser General Public License version 2.1
012 * as published by the Free Software Foundation.
013 */
014package ch.qos.logback.classic.pattern;
015
016import ch.qos.logback.classic.spi.ILoggingEvent;
017import ch.qos.logback.core.CoreConstants;
018
019/**
020 * Return the event's sequence number.
021 * 
022 * @author Bertrand Renuart
023 * @since 1.3.0
024 */
025public class SequenceNumberConverter extends ClassicConverter {
026
027        @Override
028        public void start() {
029                if(getContext() == null) {
030                        // this should not happen
031                        return;
032                }
033
034                if (getContext().getSequenceNumberGenerator() == null) {
035                        addWarn("It looks like no <sequenceNumberGenerator> was defined in Logback configuration.");
036                }
037                super.start();
038        }
039        
040        
041        @Override
042    public String convert(ILoggingEvent event) {
043                return Long.toString(event.getSequenceNumber());
044   }
045
046}