content: /**
   * 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.alibaba.jstorm.yarn;
  
  import java.io.FileInputStream;
  import java.io.InputStream;
  import java.util.Map.Entry;
  import java.util.Properties;
  
  import org.apache.commons.io.IOUtils;
  import org.apache.log4j.LogManager;
  import org.apache.log4j.PropertyConfigurator;
  
  
  public class Log4jPropertyHelper {
  
      public static void updateLog4jConfiguration(Class<?> targetClass,
                                                  String log4jPath) throws Exception {
          Properties customProperties = new Properties();
          FileInputStream fs = null;
          InputStream is = null;
          try {
              fs = new FileInputStream(log4jPath);
              is = targetClass.getResourceAsStream("/log4j.properties");
              customProperties.load(fs);
              Properties originalProperties = new Properties();
              originalProperties.load(is);
              for (Entry<Object, Object> entry : customProperties.entrySet()) {
                  originalProperties.setProperty(entry.getKey().toString(), entry
                          .getValue().toString());
              }
              LogManager.resetConfiguration();
              PropertyConfigurator.configure(originalProperties);
          }finally {
              IOUtils.closeQuietly(is);
              IOUtils.closeQuietly(fs);
          }
      }
  }