/*
 * Copyright 2019 WeBank
 *
 * Licensed 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 com.webank.wedatasphere.linkis.engine.spark.common

import com.webank.wedatasphere.linkis.common.utils.Logging

/**
  * Created by allenlliu on 2018/11/19.
  */
class LineBufferedProcess(process: Process) extends Logging {

  private[this] val _inputStream = new LineBufferedStream(process.getInputStream())
  private[this] val _errorStream = new LineBufferedStream(process.getErrorStream())

  def inputLines: List[String] = _inputStream.lines
  def errorLines: List[String] = _errorStream.lines

  def inputIterator: Iterator[String] = _inputStream.iterator
  def errorIterator: Iterator[String] = _errorStream.iterator

  def destroy(): Unit = {
    _inputStream.close
    _errorStream.close
    process.destroy()
  }

  /** Returns if the process is still actively running. */
  def isAlive: Boolean = try {
    exitValue()
    false
  } catch {
    case _: IllegalStateException => true
  }

  def exitValue(): Int = {
    process.exitValue()
  }

  def waitFor(): Int = {
    process.waitFor()
  }
}
