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.Futures;
  import com.google.common.util.concurrent.ListenableFuture;
  import io.airlift.discovery.client.ServiceDescriptor;
  import io.airlift.discovery.client.ServiceSelector;
  
  import java.util.List;
  
  import static com.google.common.base.Preconditions.checkArgument;
  import static com.google.common.collect.Streams.stream;
  import static io.airlift.discovery.client.ServiceSelectorConfig.DEFAULT_POOL;
  import static java.util.Objects.requireNonNull;
  
  public class StaticServiceSelector
          implements ServiceSelector
  {
      private final String type;
      private final String pool;
      private final List<ServiceDescriptor> serviceDescriptors;
  
      public StaticServiceSelector(ServiceDescriptor... serviceDescriptors)
      {
          this(ImmutableList.copyOf(serviceDescriptors));
      }
  
      public StaticServiceSelector(Iterable<ServiceDescriptor> serviceDescriptors)
      {
          requireNonNull(serviceDescriptors, "serviceDescriptors is null");
  
          ServiceDescriptor serviceDescriptor = stream(serviceDescriptors).findFirst().orElse(null);
          if (serviceDescriptor != null) {
              this.type = serviceDescriptor.getType();
              this.pool = serviceDescriptor.getPool();
          }
          else {
              this.type = "unknown";
              this.pool = DEFAULT_POOL;
          }
  
          for (ServiceDescriptor descriptor : serviceDescriptors) {
              checkArgument(descriptor.getType().equals(type));
              checkArgument(descriptor.getPool().equals(pool));
          }
          this.serviceDescriptors = ImmutableList.copyOf(serviceDescriptors);
      }
  
      @Override
      public String getType()
      {
          return type;
      }
  
      @Override
      public String getPool()
      {
          return pool;
      }
  
      @Override
      public List<ServiceDescriptor> selectAllServices()
      {
          return serviceDescriptors;
      }
  
      @Override
      public ListenableFuture<List<ServiceDescriptor>> refresh()
      {
          return Futures.immediateFuture(serviceDescriptors);
      }
  }
  