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.calcite.avatica.remote;
  
  import org.apache.calcite.avatica.AvaticaUtils;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  
  /**
   * ProtobufService implementation that queries against a remote implementation, using
   * protocol buffers as the serialized form.
   */
  public class RemoteProtobufService extends ProtobufService {
    private static final Logger LOG = LoggerFactory.getLogger(RemoteProtobufService.class);
  
    private final AvaticaHttpClient client;
    private final ProtobufTranslation translation;
  
    public RemoteProtobufService(AvaticaHttpClient client, ProtobufTranslation translation) {
      this.client = client;
      this.translation = translation;
    }
  
    @Override public Response _apply(Request request) {
      final Response resp;
      byte[] response = null;
      try {
        response = client.send(translation.serializeRequest(request));
      } catch (IOException e) {
        LOG.debug("Failed to execute remote request: {}", request);
        // Failed to get a response from the server for the request.
        throw new RuntimeException(e);
      }
  
      try {
        resp = translation.parseResponse(response);
      } catch (IOException e) {
        LOG.debug("Failed to deserialize reponse to {}. '{}'", request,
            AvaticaUtils.newStringUtf8(response));
        // Not a protobuf that we could parse.
        throw new RuntimeException(e);
      }
  
      // The server had an error, throw an Exception for that.
      if (resp instanceof ErrorResponse) {
        throw ((ErrorResponse) resp).toException();
      }
  
      return resp;
    }
  }
  
  // End RemoteProtobufService.java
  