content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * Licensed 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.alibaba.cobar;
  
  import java.text.SimpleDateFormat;
  import java.util.Date;
  
  import org.apache.log4j.LogManager;
  import org.apache.log4j.helpers.FileWatchdog;
  import org.apache.log4j.helpers.LogLog;
  import org.apache.log4j.xml.DOMConfigurator;
  
  /**
   * @author xianmao.hexm 2010-4-19 下午01:41:49
   */
  public final class Log4jInitializer {
  
      private static final String format = "yyyy-MM-dd HH:mm:ss";
  
      public static void configureAndWatch(String filename, long delay) {
          XMLWatchdog xdog = new XMLWatchdog(filename);
          xdog.setName("Log4jWatchdog");
          xdog.setDelay(delay);
          xdog.start();
      }
  
      private static final class XMLWatchdog extends FileWatchdog {
  
          public XMLWatchdog(String filename) {
              super(filename);
          }
  
          @Override
          public void doOnChange() {
              new DOMConfigurator().doConfigure(filename, LogManager.getLoggerRepository());
              LogLog.warn(new SimpleDateFormat(format).format(new Date()) + " [" + filename + "] load completed.");
          }
      }
  
  }
  