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 java.util.concurrent.atomic.AtomicLong;
18  
19  /**
20   * A converters based on a locally incremented sequence number. The sequence
21   * number is initialized to the number of milliseconds elapsed since 1970-01-01
22   * until this instance is initialized.
23   *
24   * <p>
25   * <b>EXPERIMENTAL</b> This class is experimental and may be removed in the
26   * future.
27   *
28   */
29  public class LocalSequenceNumberConverter extends ClassicConverter {
30  
31      AtomicLong sequenceNumber = new AtomicLong(System.currentTimeMillis());
32  
33      @Override
34      public String convert(ILoggingEvent event) {
35          return Long.toString(sequenceNumber.getAndIncrement());
36      }
37  }