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Contains utility classes to expose Flight SQL semantics for clients and servers over Arrow Flight
There is a newer version: 18.1.0
/*
 * 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.flight.sql;

import java.util.List;

import org.apache.arrow.flight.ActionType;
import org.apache.arrow.flight.CallStatus;

import com.google.common.collect.ImmutableList;
import com.google.protobuf.Any;
import com.google.protobuf.InvalidProtocolBufferException;
import com.google.protobuf.Message;

/**
 * Utilities to work with Flight SQL semantics.
 */
public final class FlightSqlUtils {

  public static final ActionType FLIGHT_SQL_BEGIN_SAVEPOINT =
      new ActionType("BeginSavepoint",
          "Create a new savepoint.\n" +
              "Request Message: ActionBeginSavepointRequest\n" +
              "Response Message: ActionBeginSavepointResult");

  public static final ActionType FLIGHT_SQL_BEGIN_TRANSACTION =
      new ActionType("BeginTransaction",
          "Start a new transaction.\n" +
              "Request Message: ActionBeginTransactionRequest\n" +
              "Response Message: ActionBeginTransactionResult");
  public static final ActionType FLIGHT_SQL_CREATE_PREPARED_STATEMENT = new ActionType("CreatePreparedStatement",
      "Creates a reusable prepared statement resource on the server. \n" +
          "Request Message: ActionCreatePreparedStatementRequest\n" +
          "Response Message: ActionCreatePreparedStatementResult");

  public static final ActionType FLIGHT_SQL_CLOSE_PREPARED_STATEMENT = new ActionType("ClosePreparedStatement",
      "Closes a reusable prepared statement resource on the server. \n" +
          "Request Message: ActionClosePreparedStatementRequest\n" +
          "Response Message: N/A");

  public static final ActionType FLIGHT_SQL_CREATE_PREPARED_SUBSTRAIT_PLAN =
      new ActionType("CreatePreparedSubstraitPlan",
          "Creates a reusable prepared statement resource on the server.\n" +
              "Request Message: ActionCreatePreparedSubstraitPlanRequest\n" +
              "Response Message: ActionCreatePreparedStatementResult");

  public static final ActionType FLIGHT_SQL_CANCEL_QUERY =
      new ActionType("CancelQuery",
          "Explicitly cancel a running query.\n" +
              "Request Message: ActionCancelQueryRequest\n" +
              "Response Message: ActionCancelQueryResult");

  public static final ActionType FLIGHT_SQL_END_SAVEPOINT =
      new ActionType("EndSavepoint",
          "End a savepoint.\n" +
              "Request Message: ActionEndSavepointRequest\n" +
              "Response Message: N/A");
  public static final ActionType FLIGHT_SQL_END_TRANSACTION =
      new ActionType("EndTransaction",
          "End a transaction.\n" +
              "Request Message: ActionEndTransactionRequest\n" +
              "Response Message: N/A");

  public static final List FLIGHT_SQL_ACTIONS = ImmutableList.of(
      FLIGHT_SQL_CREATE_PREPARED_STATEMENT,
      FLIGHT_SQL_CLOSE_PREPARED_STATEMENT
  );

  /**
   * Helper to parse {@link com.google.protobuf.Any} objects to the specific protobuf object.
   *
   * @param source the raw bytes source value.
   * @return the materialized protobuf object.
   */
  public static Any parseOrThrow(byte[] source) {
    try {
      return Any.parseFrom(source);
    } catch (final InvalidProtocolBufferException e) {
      throw CallStatus.INVALID_ARGUMENT
          .withDescription("Received invalid message from remote.")
          .withCause(e)
          .toRuntimeException();
    }
  }

  /**
   * Helper to unpack {@link com.google.protobuf.Any} objects to the specific protobuf object.
   *
   * @param source the parsed Source value.
   * @param as     the class to unpack as.
   * @param     the class to unpack as.
   * @return the materialized protobuf object.
   */
  public static  T unpackOrThrow(Any source, Class as) {
    try {
      return source.unpack(as);
    } catch (final InvalidProtocolBufferException e) {
      throw CallStatus.INVALID_ARGUMENT
          .withDescription("Provided message cannot be unpacked as " + as.getName() + ": " + e)
          .withCause(e)
          .toRuntimeException();
    }
  }

  /**
   * Helper to parse and unpack {@link com.google.protobuf.Any} objects to the specific protobuf object.
   *
   * @param source the raw bytes source value.
   * @param as     the class to unpack as.
   * @param     the class to unpack as.
   * @return the materialized protobuf object.
   */
  public static  T unpackAndParseOrThrow(byte[] source, Class as) {
    return unpackOrThrow(parseOrThrow(source), as);
  }
}