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; 017 018public class RelativeTimeConverter extends ClassicConverter { 019 020 long lastTimestamp = -1; 021 String timesmapCache = null; 022 023 public String convert(ILoggingEvent event) { 024 long now = event.getTimeStamp(); 025 026 synchronized (this) { 027 // update timesmapStrCache only if now != lastTimestamp 028 if (now != lastTimestamp) { 029 lastTimestamp = now; 030 timesmapCache = Long.toString(now - event.getLoggerContextVO().getBirthTime()); 031 } 032 return timesmapCache; 033 } 034 } 035}