content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.nacos.core.listener;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.core.env.ConfigurableEnvironment;
  
  import static org.springframework.boot.context.logging.LoggingApplicationListener.CONFIG_PROPERTY;
  import static org.springframework.core.io.ResourceLoader.CLASSPATH_URL_PREFIX;
  
  /**
   * For init logging configuration.
   *
   * @author horizonzy
   * @since 1.4.1
   */
  public class LoggingApplicationListener implements NacosApplicationListener {
      
      private static final String DEFAULT_NACOS_LOGBACK_LOCATION = CLASSPATH_URL_PREFIX + "META-INF/logback/nacos.xml";
      
      private static final Logger LOGGER = LoggerFactory.getLogger(LoggingApplicationListener.class);
      
      @Override
      public void environmentPrepared(ConfigurableEnvironment environment) {
          if (!environment.containsProperty(CONFIG_PROPERTY)) {
              System.setProperty(CONFIG_PROPERTY, DEFAULT_NACOS_LOGBACK_LOCATION);
              if (LOGGER.isInfoEnabled()) {
                  LOGGER.info("There is no property named \"{}\" in Spring Boot Environment, "
                                  + "and whose value is {} will be set into System's Properties", CONFIG_PROPERTY,
                          DEFAULT_NACOS_LOGBACK_LOCATION);
              }
          }
      }
  }
  