/*
 * 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.griffin.measure.launch

import scala.util.Try

import org.apache.spark.sql.SparkSession

import org.apache.griffin.measure.Loggable
import org.apache.griffin.measure.configuration.dqdefinition.{DQConfig, EnvConfig, SinkParam}

/**
 * dq application process
 */
trait DQApp extends Loggable with Serializable {

  val envParam: EnvConfig
  val dqParam: DQConfig

  implicit var sparkSession: SparkSession = _

  def init: Try[_]

  /**
   * @return execution success
   */
  def run: Try[Boolean]

  def close: Try[_]

  /**
   * application will exit if it fails in run phase.
   * if retryable is true, the exception will be threw to spark env,
   * and enable retry strategy of spark application
   */
  def retryable: Boolean

  /**
   * timestamp as a key for metrics
   */
  protected def getMeasureTime: Long = {
    dqParam.getTimestampOpt match {
      case Some(t) if t > 0 => t
      case _ => System.currentTimeMillis
    }
  }

  protected def getSinkParams: Seq[SinkParam] = {
    val validSinkTypes = dqParam.getValidSinkTypes
    envParam.getSinkParams.flatMap { sinkParam =>
      if (validSinkTypes.contains(sinkParam.getType)) Some(sinkParam) else None
    }
  }

}