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.naming.remote.http;
  
  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.HttpClientFactory;
  import com.alibaba.nacos.common.http.client.NacosRestTemplate;
  import com.alibaba.nacos.common.lifecycle.Closeable;
  import com.alibaba.nacos.common.tls.TlsSystemConfig;
  import com.alibaba.nacos.common.utils.ExceptionUtil;
  import org.slf4j.Logger;
  
  import static com.alibaba.nacos.client.utils.LogUtils.NAMING_LOGGER;
  import static com.alibaba.nacos.common.constant.RequestUrlConstants.HTTPS_PREFIX;
  import static com.alibaba.nacos.common.constant.RequestUrlConstants.HTTP_PREFIX;
  
  /**
   * http Manager.
   *
   * @author mai.jh
   */
  public class NamingHttpClientManager implements Closeable {
      
      private static final int READ_TIME_OUT_MILLIS = Integer
              .getInteger("com.alibaba.nacos.client.naming.rtimeout", 50000);
      
      private static final int CON_TIME_OUT_MILLIS = Integer.getInteger("com.alibaba.nacos.client.naming.ctimeout", 3000);
      
      private static final boolean ENABLE_HTTPS = Boolean.getBoolean(TlsSystemConfig.TLS_ENABLE);
      
      private static final int MAX_REDIRECTS = 5;
      
      private static final HttpClientFactory HTTP_CLIENT_FACTORY = new NamingHttpClientFactory();
      
      private static class NamingHttpClientManagerInstance {
          
          private static final NamingHttpClientManager INSTANCE = new NamingHttpClientManager();
      }
      
      public static NamingHttpClientManager getInstance() {
          return NamingHttpClientManagerInstance.INSTANCE;
      }
      
      public String getPrefix() {
          return ENABLE_HTTPS ? HTTPS_PREFIX : HTTP_PREFIX;
      }
      
      public NacosRestTemplate getNacosRestTemplate() {
          return HttpClientBeanHolder.getNacosRestTemplate(HTTP_CLIENT_FACTORY);
      }
      
      @Override
      public void shutdown() throws NacosException {
          NAMING_LOGGER.info("[NamingHttpClientManager] Start destroying NacosRestTemplate");
          try {
              HttpClientBeanHolder.shutdownNacosSyncRest(HTTP_CLIENT_FACTORY.getClass().getName());
          } catch (Exception ex) {
              NAMING_LOGGER.error("[NamingHttpClientManager] An exception occurred when the HTTP client was closed : {}",
                      ExceptionUtil.getStackTrace(ex));
          }
          NAMING_LOGGER.info("[NamingHttpClientManager] Completed destruction of NacosRestTemplate");
      }
      
      private static class NamingHttpClientFactory extends AbstractHttpClientFactory {
          
          @Override
          protected HttpClientConfig buildHttpClientConfig() {
              return HttpClientConfig.builder().setConTimeOutMillis(CON_TIME_OUT_MILLIS)
                      .setReadTimeOutMillis(READ_TIME_OUT_MILLIS).setMaxRedirects(MAX_REDIRECTS).build();
          }
          
          @Override
          protected Logger assignLogger() {
              return NAMING_LOGGER;
          }
      }
  }
  