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.client.logging;
  
  import com.alibaba.nacos.client.env.NacosClientProperties;
  import com.alibaba.nacos.common.executor.ExecutorFactory;
  import com.alibaba.nacos.common.executor.NameThreadFactory;
  import com.alibaba.nacos.common.logging.NacosLoggingAdapter;
  import com.alibaba.nacos.common.logging.NacosLoggingAdapterBuilder;
  import com.alibaba.nacos.common.logging.NacosLoggingProperties;
  import com.alibaba.nacos.common.spi.NacosServiceLoader;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.concurrent.ScheduledExecutorService;
  import java.util.concurrent.TimeUnit;
  
  /**
   * nacos logging.
   *
   * @author mai.jh
   */
  public class NacosLogging {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(NacosLogging.class);
      
      private NacosLoggingAdapter loggingAdapter;
      
      private NacosLoggingProperties loggingProperties;
      
      private NacosLogging() {
          initLoggingAdapter();
      }
      
      private void initLoggingAdapter() {
          Class<? extends Logger> loggerClass = LOGGER.getClass();
          for (NacosLoggingAdapterBuilder each : NacosServiceLoader.load(NacosLoggingAdapterBuilder.class)) {
              LOGGER.info("Nacos Logging Adapter Builder: {}", each.getClass().getName());
              NacosLoggingAdapter tempLoggingAdapter = buildLoggingAdapterFromBuilder(each);
              if (isAdaptLogging(tempLoggingAdapter, loggerClass)) {
                  LOGGER.info("Nacos Logging Adapter: {} match {} success.", tempLoggingAdapter.getClass().getName(),
                          loggerClass.getName());
                  loggingProperties = new NacosLoggingProperties(tempLoggingAdapter.getDefaultConfigLocation(),
                          NacosClientProperties.PROTOTYPE.asProperties());
                  loggingAdapter = tempLoggingAdapter;
              }
          }
          if (null == loggingAdapter) {
              LOGGER.warn("Nacos Logging don't find adapter, logging will print into application logs.");
              return;
          }
          scheduleReloadTask();
      }
      
      private NacosLoggingAdapter buildLoggingAdapterFromBuilder(NacosLoggingAdapterBuilder builder) {
          try {
              return builder.build();
          } catch (Throwable e) {
              LOGGER.warn("Build Nacos Logging Adapter failed: {}", e.getMessage());
              return null;
          }
      }
      
      private boolean isAdaptLogging(NacosLoggingAdapter loggingAdapter, Class<? extends Logger> loggerClass) {
          return null != loggingAdapter && loggingAdapter.isEnabled() && loggingAdapter.isAdaptedLogger(loggerClass);
      }
      
      private void scheduleReloadTask() {
          ScheduledExecutorService reloadContextService = ExecutorFactory.Managed
                  .newSingleScheduledExecutorService("Nacos-Client",
                          new NameThreadFactory("com.alibaba.nacos.client.logging"));
          reloadContextService.scheduleAtFixedRate(() -> {
              if (loggingAdapter.isNeedReloadConfiguration()) {
                  loggingAdapter.loadConfiguration(loggingProperties);
              }
          }, 0, loggingProperties.getReloadInternal(), TimeUnit.SECONDS);
      }
      
      private static class NacosLoggingInstance {
          
          private static final NacosLogging INSTANCE = new NacosLogging();
      }
      
      public static NacosLogging getInstance() {
          return NacosLoggingInstance.INSTANCE;
      }
      
      /**
       * Load logging Configuration.
       */
      public void loadConfiguration() {
          try {
              if (null != loggingAdapter) {
                  loggingAdapter.loadConfiguration(loggingProperties);
              }
          } catch (Throwable t) {
              LOGGER.warn("Load {} Configuration of Nacos fail, message: {}", LOGGER.getClass().getName(),
                      t.getMessage());
          }
      }
  }
  