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.arrow.driver.jdbc.utils;
  
  import static com.google.protobuf.Any.pack;
  
  import com.google.protobuf.ByteString;
  import com.google.protobuf.Message;
  import java.util.Arrays;
  import java.util.List;
  import org.apache.arrow.flight.CallStatus;
  import org.apache.arrow.flight.FlightDescriptor;
  import org.apache.arrow.flight.FlightEndpoint;
  import org.apache.arrow.flight.FlightInfo;
  import org.apache.arrow.flight.NoOpFlightProducer;
  import org.apache.arrow.flight.Result;
  import org.apache.arrow.flight.Ticket;
  import org.apache.arrow.flight.sql.BasicFlightSqlProducer;
  import org.apache.arrow.flight.sql.impl.FlightSql;
  import org.apache.arrow.vector.VectorSchemaRoot;
  import org.apache.arrow.vector.types.pojo.Schema;
  
  public class PartitionedFlightSqlProducer extends BasicFlightSqlProducer {
  
    /** A minimal FlightProducer intended to just serve data when given the correct Ticket. */
    public static class DataOnlyFlightSqlProducer extends NoOpFlightProducer {
      private final Ticket ticket;
      private final VectorSchemaRoot data;
  
      public DataOnlyFlightSqlProducer(Ticket ticket, VectorSchemaRoot data) {
        this.ticket = ticket;
        this.data = data;
      }
  
      @Override
      public void getStream(CallContext context, Ticket ticket, ServerStreamListener listener) {
        if (!Arrays.equals(ticket.getBytes(), this.ticket.getBytes())) {
          listener.error(
              CallStatus.INVALID_ARGUMENT.withDescription("Illegal ticket.").toRuntimeException());
          return;
        }
  
        listener.start(data);
        listener.putNext();
        listener.completed();
      }
    }
  
    private final List<FlightEndpoint> endpoints;
  
    private final Schema schema;
  
    public PartitionedFlightSqlProducer(Schema schema, FlightEndpoint... endpoints) {
      this.schema = schema;
      this.endpoints = Arrays.asList(endpoints);
    }
  
    @Override
    protected <T extends Message> List<FlightEndpoint> determineEndpoints(
        T request, FlightDescriptor flightDescriptor, Schema schema) {
      return endpoints;
    }
  
    @Override
    public void createPreparedStatement(
        FlightSql.ActionCreatePreparedStatementRequest request,
        CallContext context,
        StreamListener<Result> listener) {
      final FlightSql.ActionCreatePreparedStatementResult.Builder resultBuilder =
          FlightSql.ActionCreatePreparedStatementResult.newBuilder()
              .setPreparedStatementHandle(ByteString.EMPTY);
  
      final ByteString datasetSchemaBytes = ByteString.copyFrom(schema.serializeAsMessage());
  
      resultBuilder.setDatasetSchema(datasetSchemaBytes);
      listener.onNext(new Result(pack(resultBuilder.build()).toByteArray()));
      listener.onCompleted();
    }
  
    @Override
    public FlightInfo getFlightInfoStatement(
        FlightSql.CommandStatementQuery command, CallContext context, FlightDescriptor descriptor) {
      return FlightInfo.builder(schema, descriptor, endpoints).build();
    }
  
    @Override
    public FlightInfo getFlightInfoPreparedStatement(
        FlightSql.CommandPreparedStatementQuery command,
        CallContext context,
        FlightDescriptor descriptor) {
      return FlightInfo.builder(schema, descriptor, endpoints).build();
    }
  
    @Override
    public void closePreparedStatement(
        FlightSql.ActionClosePreparedStatementRequest request,
        CallContext context,
        StreamListener<Result> listener) {
      listener.onCompleted();
    }
  
    // Note -- getStream() is intentionally not implemented.
  }
  