content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.kafka.clients.admin.internals;
  
  import org.apache.kafka.common.requests.AbstractRequest;
  import org.apache.kafka.common.requests.AbstractResponse;
  
  import java.util.OptionalInt;
  import java.util.Set;
  
  /**
   * This lookup strategy is used when we already know the destination broker ID
   * and we have no need for an explicit lookup. By setting {@link ApiRequestScope#destinationBrokerId()}
   * in the returned value for {@link #lookupScope(Object)}, the driver will
   * skip the lookup.
   */
  public class StaticBrokerStrategy<K> implements AdminApiLookupStrategy<K> {
      private final SingleBrokerScope scope;
  
      public StaticBrokerStrategy(int brokerId) {
          this.scope = new SingleBrokerScope(brokerId);
      }
  
      @Override
      public ApiRequestScope lookupScope(K key) {
          return scope;
      }
  
      @Override
      public AbstractRequest.Builder<?> buildRequest(Set<K> keys) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public LookupResult<K> handleResponse(Set<K> keys, AbstractResponse response) {
          throw new UnsupportedOperationException();
      }
  
      private static class SingleBrokerScope implements ApiRequestScope {
          private final int brokerId;
  
          private SingleBrokerScope(int brokerId) {
              this.brokerId = brokerId;
          }
  
          @Override
          public OptionalInt destinationBrokerId() {
              return OptionalInt.of(brokerId);
          }
      }
  }
  