content: /*
   * 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 io.airlift.discovery.server;
  
  import com.google.common.collect.ImmutableList;
  import com.google.common.util.concurrent.ListenableFuture;
  import com.google.inject.Inject;
  import io.airlift.discovery.client.ServiceDescriptor;
  import io.airlift.discovery.client.ServiceInventory;
  import io.airlift.discovery.client.ServiceSelector;
  import io.airlift.node.NodeInfo;
  
  import java.util.List;
  
  import static com.google.common.util.concurrent.Futures.immediateFuture;
  import static java.util.Objects.requireNonNull;
  
  public class DiscoveryServiceSelector
          implements ServiceSelector
  {
      private final NodeInfo nodeInfo;
      private final ServiceInventory inventory;
  
      @Inject
      public DiscoveryServiceSelector(NodeInfo nodeInfo, ServiceInventory inventory)
      {
          this.nodeInfo = requireNonNull(nodeInfo, "nodeInfo is null");
          this.inventory = requireNonNull(inventory, "inventory is null");
      }
  
      @Override
      public String getType()
      {
          return "discovery";
      }
  
      @Override
      public String getPool()
      {
          return nodeInfo.getPool();
      }
  
      @Override
      public List<ServiceDescriptor> selectAllServices()
      {
          return ImmutableList.copyOf(inventory.getServiceDescriptors(getType()));
      }
  
      @Override
      public ListenableFuture<List<ServiceDescriptor>> refresh()
      {
          // this should be async, but it is never used
          inventory.updateServiceInventory();
          return immediateFuture(selectAllServices());
      }
  }
  