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.config.server.service.notify;
  
  import com.alibaba.nacos.common.http.AbstractHttpClientFactory;
  import com.alibaba.nacos.common.http.HttpClientBeanHolder;
  import com.alibaba.nacos.common.http.HttpClientConfig;
  import com.alibaba.nacos.common.http.client.NacosAsyncRestTemplate;
  import com.alibaba.nacos.common.http.client.NacosRestTemplate;
  import com.alibaba.nacos.common.utils.ExceptionUtil;
  import com.alibaba.nacos.common.utils.ThreadUtils;
  import com.alibaba.nacos.config.server.utils.PropertyUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * http client manager.
   *
   * @author mai.jh
   */
  public final class HttpClientManager {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientManager.class);
      
      /**
       * Connection timeout and socket timeout with other servers.
       */
      private static final int TIMEOUT = 500;
      
      private static final NacosRestTemplate NACOS_REST_TEMPLATE;
      
      private static final NacosAsyncRestTemplate NACOS_ASYNC_REST_TEMPLATE;
      
      static {
          // build nacos rest template
          NACOS_REST_TEMPLATE = HttpClientBeanHolder.getNacosRestTemplate(new ConfigHttpClientFactory(TIMEOUT, TIMEOUT));
          NACOS_ASYNC_REST_TEMPLATE = HttpClientBeanHolder.getNacosAsyncRestTemplate(
                  new ConfigHttpClientFactory(PropertyUtil.getNotifyConnectTimeout(),
                          PropertyUtil.getNotifySocketTimeout()));
          
          ThreadUtils.addShutdownHook(HttpClientManager::shutdown);
      }
      
      public static NacosRestTemplate getNacosRestTemplate() {
          return NACOS_REST_TEMPLATE;
      }
      
      public static NacosAsyncRestTemplate getNacosAsyncRestTemplate() {
          return NACOS_ASYNC_REST_TEMPLATE;
      }
      
      private static void shutdown() {
          LOGGER.info("[ConfigServer-HttpClientManager] Start destroying NacosRestTemplate");
          try {
              final String httpClientFactoryBeanName = ConfigHttpClientFactory.class.getName();
              HttpClientBeanHolder.shutdownNacosSyncRest(httpClientFactoryBeanName);
              HttpClientBeanHolder.shutdownNacosAsyncRest(httpClientFactoryBeanName);
          } catch (Exception ex) {
              LOGGER.error("[ConfigServer-HttpClientManager] An exception occurred when the HTTP client was closed : {}",
                      ExceptionUtil.getStackTrace(ex));
          }
          LOGGER.info("[ConfigServer-HttpClientManager] Completed destruction of NacosRestTemplate");
      }
      
      /**
       * http client factory.
       */
      private static class ConfigHttpClientFactory extends AbstractHttpClientFactory {
          
          private final int conTimeOutMillis;
          
          private final int readTimeOutMillis;
          
          public ConfigHttpClientFactory(int conTimeOutMillis, int readTimeOutMillis) {
              this.conTimeOutMillis = conTimeOutMillis;
              this.readTimeOutMillis = readTimeOutMillis;
          }
          
          @Override
          protected HttpClientConfig buildHttpClientConfig() {
              return HttpClientConfig.builder().setConTimeOutMillis(conTimeOutMillis)
                      .setReadTimeOutMillis(readTimeOutMillis).build();
          }
          
          @Override
          protected Logger assignLogger() {
              return LOGGER;
          }
      }
  }
  