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.remote;
  
  import com.alibaba.nacos.api.exception.NacosException;
  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.NacosRestTemplate;
  import com.alibaba.nacos.common.lifecycle.Closeable;
  import com.alibaba.nacos.common.utils.ExceptionUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * http Manager.
   *
   * @author Nacos
   */
  public class HttpClientManager implements Closeable {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientManager.class);
      
      private static final HttpClientFactory HTTP_CLIENT_FACTORY = new HttpClientFactory();
      
      private static final int CON_TIME_OUT_MILLIS = 1000;
      
      private static final int READ_TIME_OUT_MILLIS = 3000;
      
      private static class HttpClientManagerInstance {
          
          private static final HttpClientManager INSTANCE = new HttpClientManager();
      }
      
      public static HttpClientManager getInstance() {
          return HttpClientManagerInstance.INSTANCE;
      }
      
      @Override
      public void shutdown() throws NacosException {
          LOGGER.info("[HttpClientManager] Start destroying NacosRestTemplate");
          try {
              HttpClientBeanHolder.shutdownNacosSyncRest(HTTP_CLIENT_FACTORY.getClass().getName());
          } catch (Exception ex) {
              LOGGER.error("[HttpClientManager] An exception occurred when the HTTP client was closed : {}",
                      ExceptionUtil.getStackTrace(ex));
          }
          LOGGER.info("[HttpClientManager] Completed destruction of NacosRestTemplate");
      }
      
      /**
       * get connectTimeout.
       *
       * @param connectTimeout connectTimeout
       * @return int return max timeout
       */
      public int getConnectTimeoutOrDefault(int connectTimeout) {
          return Math.max(CON_TIME_OUT_MILLIS, connectTimeout);
      }
      
      /**
       * get NacosRestTemplate Instance.
       *
       * @return NacosRestTemplate
       */
      public NacosRestTemplate getNacosRestTemplate() {
          return HttpClientBeanHolder.getNacosRestTemplate(HTTP_CLIENT_FACTORY);
      }
      
      /**
       * HttpClientFactory.
       */
      private static class HttpClientFactory extends AbstractHttpClientFactory {
          
          @Override
          protected HttpClientConfig buildHttpClientConfig() {
              return HttpClientConfig.builder().setConTimeOutMillis(CON_TIME_OUT_MILLIS)
                      .setReadTimeOutMillis(READ_TIME_OUT_MILLIS).build();
          }
          
          @Override
          protected Logger assignLogger() {
              return LOGGER;
          }
      }
  }
  