core/src/main/scala/org/apache/livy/msgs.scala

/*
 * 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.livy

sealed trait MsgType

object MsgType {
  case object execute_request extends MsgType
  case object execute_reply extends MsgType
}

case class Msg[T <: Content](msg_type: MsgType, content: T)

sealed trait Content

case class ExecuteRequest(code: String, kind: Option[String]) extends Content {
  val msg_type = MsgType.execute_request
}

sealed trait ExecutionStatus
object ExecutionStatus {
  case object ok extends ExecutionStatus
  case object error extends ExecutionStatus
  case object abort extends ExecutionStatus
}

sealed trait ExecuteReply extends Content {
  val msg_type = MsgType.execute_reply

  val status: ExecutionStatus
  val execution_count: Int
}

case class ExecuteReplyOk(execution_count: Int,
                          payload: Map[String, String]) extends ExecuteReply {
  val status = ExecutionStatus.ok
}

case class ExecuteReplyError(execution_count: Int,
                             ename: String,
                             evalue: String,
                             traceback: List[String]) extends ExecuteReply {
  val status = ExecutionStatus.error
}

case class ExecuteResponse(id: Int, input: Seq[String], output: Seq[String])

case class CompletionRequest(code: String, kind: String, cursor: Int) extends Content

case class CompletionResponse(candidates: List[String]) extends Content

case class ShutdownRequest() extends Content