1 /**
2 * Logback: the reliable, generic, fast and flexible logging framework.
3 * Copyright (C) 1999-2011, 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
18 public class RelativeTimeConverter extends ClassicConverter {
19
20 long lastTimestamp = -1;
21 String timesmapCache = null;
22
23 public String convert(ILoggingEvent event) {
24 long now = event.getTimeStamp();
25
26 synchronized (this) {
27 // update timesmapStrCache only if now != lastTimestamp
28 if (now != lastTimestamp) {
29 lastTimestamp = now;
30 timesmapCache = Long.toString(now - event.getLoggerContextVO().getBirthTime());
31 }
32 return timesmapCache;
33 }
34 }
35 }