content: /*
   * Copyright 1999-2023 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.logger.adapter.log4j2;
  
  import com.alibaba.nacos.common.logging.NacosLoggingProperties;
  import org.apache.logging.log4j.core.config.plugins.Plugin;
  
  /**
   * Log4j2 nacos logging properties holder.
   *
   * <p>
   * Log4j2 use {@link Plugin} annotation to inject Properties lookup to set properties, this holder is to keep the {@link
   * NacosLoggingProperties} and called in {@link NacosClientPropertiesLookup} which is annotate by {@link Plugin}.
   * </p>
   *
   * @author xiweng.yy
   */
  public class Log4j2NacosLoggingPropertiesHolder {
      
      private static final Log4j2NacosLoggingPropertiesHolder INSTANCE = new Log4j2NacosLoggingPropertiesHolder();
      
      private NacosLoggingProperties properties;
      
      public static void setProperties(NacosLoggingProperties properties) {
          INSTANCE.properties = properties;
      }
      
      public static String getValue(String key) {
          return null == INSTANCE.properties ? null : INSTANCE.properties.getValue(key, null);
      }
      
  }
  