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.naming.remote.rpc.handler;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.api.naming.remote.request.ServiceListRequest;
  import com.alibaba.nacos.api.naming.remote.response.ServiceListResponse;
  import com.alibaba.nacos.api.remote.request.RequestMeta;
  import com.alibaba.nacos.auth.annotation.Secured;
  import com.alibaba.nacos.core.control.TpsControl;
  import com.alibaba.nacos.core.namespace.filter.NamespaceValidation;
  import com.alibaba.nacos.core.paramcheck.ExtractorManager;
  import com.alibaba.nacos.core.paramcheck.impl.ServiceListRequestParamExtractor;
  import com.alibaba.nacos.core.remote.RequestHandler;
  import com.alibaba.nacos.naming.core.v2.ServiceManager;
  import com.alibaba.nacos.naming.core.v2.pojo.Service;
  import com.alibaba.nacos.naming.utils.ServiceUtil;
  import com.alibaba.nacos.plugin.auth.constant.ActionTypes;
  import org.springframework.stereotype.Component;
  
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Objects;
  
  /**
   * Service list request handler.
   *
   * @author xiweng.yy
   */
  @Component
  public class ServiceListRequestHandler extends RequestHandler<ServiceListRequest, ServiceListResponse> {
      
      @Override
      @NamespaceValidation
      @TpsControl(pointName = "RemoteNamingServiceListQuery", name = "RemoteNamingServiceListQuery")
      @Secured(action = ActionTypes.READ)
      @ExtractorManager.Extractor(rpcExtractor = ServiceListRequestParamExtractor.class)
      public ServiceListResponse handle(ServiceListRequest request, RequestMeta meta) throws NacosException {
          Collection<Service> serviceSet = ServiceManager.getInstance().getSingletons(request.getNamespace());
          ServiceListResponse result = ServiceListResponse.buildSuccessResponse(0, new LinkedList<>());
          if (!serviceSet.isEmpty()) {
              Collection<String> serviceNameSet = selectServiceWithGroupName(serviceSet, request.getGroupName());
              // TODO select service by selector
              List<String> serviceNameList = ServiceUtil
                      .pageServiceName(request.getPageNo(), request.getPageSize(), serviceNameSet);
              result.setCount(serviceNameSet.size());
              result.setServiceNames(serviceNameList);
          }
          return result;
      }
      
      private Collection<String> selectServiceWithGroupName(Collection<Service> serviceSet, String groupName) {
          Collection<String> result = new HashSet<>(serviceSet.size());
          for (Service each : serviceSet) {
              if (Objects.equals(groupName, each.getGroup())) {
                  result.add(each.getGroupedServiceName());
              }
          }
          return result;
      }
      
  }
  