za.co.absa.spline.test.fixture.SparkFixture.scala Maven / Gradle / Ivy

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/*
 * Copyright 2019 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.test.fixture

import java.io.File
import java.sql.DriverManager

import org.apache.commons.io.FileUtils
import org.apache.spark.sql.SparkSession
import za.co.absa.spline.common.TempDirectory

import scala.util.Try

trait SparkFixture {

  val warehouseDir: String = TempDirectory("SparkFixture", "UnitTest", pathOnly = true).deleteOnExit().path.toString.stripSuffix("/")

  private val sessionBuilder: SparkSession.Builder =
    SparkSession.builder
      .master("local")
      .config("spark.ui.enabled", "false")
      .config("spark.sql.warehouse.dir", warehouseDir)

  def withNewSparkSession[T](testBody: SparkSession => T): T = {
    withCustomSparkSession(identity)(testBody)
  }

  def withCustomSparkSession[T](builderCustomizer: SparkSession.Builder => SparkSession.Builder)(testBody: SparkSession => T): T = {
    testBody(builderCustomizer(sessionBuilder).getOrCreate.newSession)
  }

  def withRestartingSparkContext[T](testBody: => T): T = {
    haltSparkAndCleanup()
    try testBody
    finally haltSparkAndCleanup()
  }

  private def haltSparkAndCleanup(): Unit = {
    SparkSession.getDefaultSession.foreach(_.close())
    // clean up Derby resources to allow for re-creation of a Hive context later in the same JVM instance
    Try(DriverManager.getConnection("jdbc:derby:;shutdown=true"))
    FileUtils.deleteQuietly(new File("metastore_db"))
    FileUtils.deleteQuietly(new File(warehouseDir))
  }
}