1 /**
2 * Logback: the reliable, generic, fast and flexible logging framework.
3 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4 *
5 * This program and the accompanying materials are dual-licensed under
6 * either the terms of the Eclipse Public License v1.0 as published by
7 * the Eclipse Foundation
8 *
9 * or (per the licensee's choosing)
10 *
11 * under the terms of the GNU Lesser General Public License version 2.1
12 * as published by the Free Software Foundation.
13 */
14 package ch.qos.logback.classic.pattern;
15
16 import ch.qos.logback.classic.spi.ILoggingEvent;
17 import ch.qos.logback.core.CoreConstants;
18
19 /**
20 * Return the event's sequence number.
21 *
22 * @author Bertrand Renuart
23 * @since 1.3.0
24 */
25 public class SequenceNumberConverter extends ClassicConverter {
26
27 @Override
28 public void start() {
29 if(getContext() == null) {
30 // this should not happen
31 return;
32 }
33
34 if (getContext().getSequenceNumberGenerator() == null) {
35 addWarn("It looks like no <sequenceNumberGenerator> was defined in Logback configuration.");
36 }
37 super.start();
38 }
39
40
41 @Override
42 public String convert(ILoggingEvent event) {
43 return Long.toString(event.getSequenceNumber());
44 }
45
46 }