za.co.absa.spline.SparkApp.scala Maven / Gradle / Ivy

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/*
 * Copyright 2020 ABSA Group Limited
 *
 * 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 za.co.absa.spline

import org.apache.spark.sql.{SQLContext, SQLImplicits, SparkSession}

/**
 * The class represents skeleton of a example application and looks after initialization of SparkSession, etc
 *
 * @param name   A spark application name
 * @param master A spark master
 * @param conf   Custom properties
 */
abstract class SparkApp
(
  name: String,
  master: String = "local[*]",
  conf: Seq[(String, String)] = Nil,
  tags: Seq[String] = Nil
) extends SQLImplicits with App {

  private val sparkBuilder =
    SparkSession.builder()
      .appName(name)
      .master(master)
      .config("spark.driver.host", "localhost")
      .config("spark.ui.enabled", "false")
      .config("spline.example.tags", tags.mkString(","))

  for ((k, v) <- conf) sparkBuilder.config(k, v)

  /**
   * A Spark session.
   */
  val spark: SparkSession = sparkBuilder.getOrCreate()

  protected override def _sqlContext: SQLContext = spark.sqlContext // NOSONAR
}