SparkConfig refactor (#90)

Author: artemkorsakov

nebula-algorithm/src/main/scala/com/vesoft/nebula/algorithm/config/SparkConfig.scala

@@ -11,26 +11,22 @@ case class SparkConfig(spark: SparkSession, partitionNum: Int)
 
 object SparkConfig {
 
-  var spark: SparkSession = _
-
-  var partitionNum: String = _
-
   def getSpark(configs: Configs, defaultAppName: String = "algorithm"): SparkConfig = {
     val sparkConfigs = configs.sparkConfig.map
     val session = SparkSession.builder
       .appName(defaultAppName)
       .config("spark.serializer", "org.apache.spark.serializer.KryoSerializer")
 
-    for (key <- sparkConfigs.keySet) {
-      session.config(key, sparkConfigs(key))
+    sparkConfigs.foreach { case (key, value) =>
+      session.config(key, value)
     }
-    partitionNum = sparkConfigs.getOrElse("spark.app.partitionNum", "0")
+    val partitionNum = sparkConfigs.getOrElse("spark.app.partitionNum", "0")
     val spark = session.getOrCreate()
     validate(spark.version, "2.4.*")
     SparkConfig(spark, partitionNum.toInt)
   }
 
-  def validate(sparkVersion: String, supportedVersions: String*): Unit = {
+  private def validate(sparkVersion: String, supportedVersions: String*): Unit = {
     if (sparkVersion != "UNKNOWN" && !supportedVersions.exists(sparkVersion.matches)) {
       throw new RuntimeException(
         s"""Your current spark version ${sparkVersion} is not supported by the current NebulaGraph Algorithm.