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.consumer.internals;
  
  import org.apache.kafka.clients.ClientResponse;
  import org.apache.kafka.common.Node;
  import org.apache.kafka.common.requests.AbstractRequest;
  import org.apache.kafka.common.requests.AbstractResponse;
  import org.apache.kafka.common.utils.LogContext;
  
  import org.slf4j.Logger;
  
  public abstract class AsyncClient<T1, Req extends AbstractRequest, Resp extends AbstractResponse, T2> {
  
      private final Logger log;
      private final ConsumerNetworkClient client;
  
      AsyncClient(ConsumerNetworkClient client, LogContext logContext) {
          this.client = client;
          this.log = logContext.logger(getClass());
      }
  
      public RequestFuture<T2> sendAsyncRequest(Node node, T1 requestData) {
          AbstractRequest.Builder<Req> requestBuilder = prepareRequest(node, requestData);
  
          return client.send(node, requestBuilder).compose(new RequestFutureAdapter<>() {
              @Override
              @SuppressWarnings("unchecked")
              public void onSuccess(ClientResponse value, RequestFuture<T2> future) {
                  Resp resp;
                  try {
                      resp = (Resp) value.responseBody();
                  } catch (ClassCastException cce) {
                      log.error("Could not cast response body", cce);
                      future.raise(cce);
                      return;
                  }
                  log.trace("Received {} {} from broker {}", resp.getClass().getSimpleName(), resp, node);
                  try {
                      future.complete(handleResponse(node, requestData, resp));
                  } catch (RuntimeException e) {
                      if (!future.isDone()) {
                          future.raise(e);
                      }
                  }
              }
  
          });
      }
  
      protected Logger logger() {
          return log;
      }
  
      protected abstract AbstractRequest.Builder<Req> prepareRequest(Node node, T1 requestData);
  
      protected abstract T2 handleResponse(Node node, T1 requestData, Resp response);
  }
  