com.echobox.logging.ThreadIdConverter Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.echobox.logging;

import ch.qos.logback.classic.pattern.ClassicConverter;
import ch.qos.logback.classic.spi.ILoggingEvent;

/**
 * A converter used in logging to create a unique thread id
 * 
 * @author MarcF 
 */
public class ThreadIdConverter extends ClassicConverter {

  private static int nextId = 0;
  private static final ThreadLocal threadId = new ThreadLocal() {

    @Override
    protected String initialValue() {
      int nextId = nextId();
      return String.format("%05d", nextId);
    }
  };

  private static synchronized int nextId() {
    nextId = (nextId + 1) % 99999;
    return nextId;
  }

  @Override
  public String convert(ILoggingEvent event) {
    return threadId.get();
  }
}