content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.grpc;
  
  import java.util.Optional;
  import javax.annotation.Nullable;
  
  /**
   * A provider of {@link DataMessageMarshaller} for a gRPC call.
   *
   * @param <ReqT> type of the request message
   * @param <ResT> type of the response message
   */
  public class DataMessageMarshallerProvider<ReqT, ResT>  {
    private final DataMessageMarshaller<ReqT> mRequestMarshaller;
    private final DataMessageMarshaller<ResT> mResponseMarshaller;
  
    /**
     * @param requestMarshaller the marshaller for the request, or null if not provided
     * @param responseMarshaller the marshaller for the response, or null if not provided
     */
    public DataMessageMarshallerProvider(@Nullable DataMessageMarshaller<ReqT> requestMarshaller,
        @Nullable DataMessageMarshaller<ResT> responseMarshaller) {
      mRequestMarshaller = requestMarshaller;
      mResponseMarshaller = responseMarshaller;
    }
  
    /**
     * @return the request marshaller
     */
    public Optional<DataMessageMarshaller<ReqT>> getRequestMarshaller() {
      return Optional.ofNullable(mRequestMarshaller);
    }
  
    /**
     * @return the response marshaller
     */
    public Optional<DataMessageMarshaller<ResT>> getResponseMarshaller() {
      return Optional.ofNullable(mResponseMarshaller);
    }
  }
  