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 java.util.concurrent.atomic.AtomicLong;
018
019/**
020 * A converters based on a locally incremented sequence number. The sequence
021 * number is initialized to the number of milliseconds elapsed since 1970-01-01
022 * until this instance is initialized.
023 *
024 * <p>
025 * <b>EXPERIMENTAL</b> This class is experimental and may be removed in the
026 * future.
027 *
028 */
029public class LocalSequenceNumberConverter extends ClassicConverter {
030
031    AtomicLong sequenceNumber = new AtomicLong(System.currentTimeMillis());
032
033    @Override
034    public String convert(ILoggingEvent event) {
035        return Long.toString(sequenceNumber.getAndIncrement());
036    }
037}