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.logback12;
  
  import ch.qos.logback.classic.Level;
  import ch.qos.logback.classic.Logger;
  import ch.qos.logback.classic.LoggerContext;
  import ch.qos.logback.classic.spi.LoggerContextListener;
  import com.alibaba.nacos.common.logging.NacosLoggingAdapter;
  import com.alibaba.nacos.common.logging.NacosLoggingProperties;
  import com.alibaba.nacos.common.utils.ResourceUtils;
  import com.alibaba.nacos.common.utils.StringUtils;
  import org.slf4j.LoggerFactory;
  
  /**
   * Support for Logback version 1.0.8 to 1.2.X.
   *
   * @author <a href="mailto:huangxiaoyu1018@gmail.com">hxy1991</a>
   * @author <a href="mailto:hujun3@xiaomi.com">hujun</a>
   * @author xiweng.yy
   * @since 0.9.0
   */
  public class LogbackNacosLoggingAdapter implements NacosLoggingAdapter {
      
      private static final String NACOS_LOGBACK_LOCATION = "classpath:nacos-logback12.xml";
      
      private static final String LOGBACK_CLASSES = "ch.qos.logback.classic.Logger";
      
      private final NacosLogbackConfiguratorAdapterV1 configurator;
      
      public LogbackNacosLoggingAdapter() {
          configurator = new NacosLogbackConfiguratorAdapterV1();
      }
      
      @Override
      public boolean isAdaptedLogger(Class<?> loggerClass) {
          Class<?> expectedLoggerClass = getExpectedLoggerClass();
          if (null == expectedLoggerClass || !expectedLoggerClass.isAssignableFrom(loggerClass)) {
              return false;
          }
          return !isUpperLogback13();
      }
      
      private Class<?> getExpectedLoggerClass() {
          try {
              return Class.forName(LOGBACK_CLASSES);
          } catch (ClassNotFoundException e) {
              return null;
          }
      }
      
      /**
       * logback use 'ch.qos.logback.core.model.Model' since 1.3.0, set logback version during initialization.
       */
      private boolean isUpperLogback13() {
          try {
              Class.forName("ch.qos.logback.core.model.Model");
              return true;
          } catch (ClassNotFoundException e) {
              return false;
          }
      }
      
      @Override
      public boolean isNeedReloadConfiguration() {
          return false;
      }
      
      @Override
      public String getDefaultConfigLocation() {
          return NACOS_LOGBACK_LOCATION;
      }
      
      @Override
      public void loadConfiguration(NacosLoggingProperties loggingProperties) {
          String location = loggingProperties.getLocation();
          configurator.setLoggingProperties(loggingProperties);
          LoggerContext loggerContext = loadConfigurationOnStart(location);
          if (hasNoListener(loggerContext)) {
              addListener(loggerContext, location);
          }
      }
      
      private boolean hasNoListener(LoggerContext loggerContext) {
          for (LoggerContextListener loggerContextListener : loggerContext.getCopyOfListenerList()) {
              if (loggerContextListener instanceof NacosLoggerContextListener) {
                  return false;
              }
          }
          return true;
      }
      
      private LoggerContext loadConfigurationOnStart(final String location) {
          LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
          configurator.setContext(loggerContext);
          if (StringUtils.isNotBlank(location)) {
              try {
                  boolean isPackagingDataEnabled = loggerContext.isPackagingDataEnabled();
                  configurator.configure(ResourceUtils.getResourceUrl(location));
                  loggerContext.setPackagingDataEnabled(isPackagingDataEnabled);
              } catch (Exception e) {
                  throw new IllegalStateException("Could not initialize Logback Nacos logging from " + location, e);
              }
          }
          return loggerContext;
      }
      
      class NacosLoggerContextListener implements LoggerContextListener {
          
          private final String location;
          
          NacosLoggerContextListener(String location) {
              this.location = location;
          }
          
          @Override
          public boolean isResetResistant() {
              return true;
          }
          
          @Override
          public void onReset(LoggerContext context) {
              loadConfigurationOnStart(location);
          }
          
          @Override
          public void onStart(LoggerContext context) {
          }
          
          @Override
          public void onStop(LoggerContext context) {
          }
          
          @Override
          public void onLevelChange(Logger logger, Level level) {
          }
      }
      
      private void addListener(LoggerContext loggerContext, String location) {
          loggerContext.addListener(new NacosLoggerContextListener(location));
      }
      
  }
  