content: /*
   * Copyright 2010 Proofpoint, Inc.
   *
   * 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.client.testing;
  
  import com.google.common.collect.ImmutableList;
  import com.google.common.util.concurrent.FluentFuture;
  import com.google.common.util.concurrent.ListenableFuture;
  import io.airlift.discovery.client.DiscoveryException;
  import io.airlift.discovery.client.DiscoveryLookupClient;
  import io.airlift.discovery.client.ServiceDescriptor;
  import io.airlift.discovery.client.ServiceDescriptors;
  import io.airlift.discovery.client.ServiceSelector;
  import io.airlift.discovery.client.ServiceSelectorConfig;
  import io.airlift.log.Logger;
  
  import java.util.List;
  
  import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
  import static io.airlift.concurrent.MoreFutures.getFutureValue;
  import static java.util.Objects.requireNonNull;
  
  public class SimpleServiceSelector
          implements ServiceSelector
  {
      private static final Logger log = Logger.get(SimpleServiceSelector.class);
  
      private final String type;
      private final String pool;
      private final DiscoveryLookupClient lookupClient;
  
      public SimpleServiceSelector(String type, ServiceSelectorConfig selectorConfig, DiscoveryLookupClient lookupClient)
      {
          requireNonNull(type, "type is null");
          requireNonNull(selectorConfig, "selectorConfig is null");
          requireNonNull(lookupClient, "client is null");
  
          this.type = type;
          this.pool = selectorConfig.getPool();
          this.lookupClient = lookupClient;
      }
  
      @Override
      public String getType()
      {
          return type;
      }
  
      @Override
      public String getPool()
      {
          return pool;
      }
  
      @Override
      public List<ServiceDescriptor> selectAllServices()
      {
          try {
              ListenableFuture<ServiceDescriptors> future = lookupClient.getServices(type, pool);
              ServiceDescriptors serviceDescriptors = getFutureValue(future, DiscoveryException.class);
              return serviceDescriptors.getServiceDescriptors();
          }
          catch (DiscoveryException e) {
              log.error(e);
              return ImmutableList.of();
          }
      }
  
      @Override
      public ListenableFuture<List<ServiceDescriptor>> refresh()
      {
          return FluentFuture.from(lookupClient.getServices(type, pool))
                  .transform(ServiceDescriptors::getServiceDescriptors, directExecutor());
      }
  }
  