com.mongodb.spark.SparkContextFunctions.scala Maven / Gradle / Ivy
/*
* Copyright 2016 MongoDB, Inc.
*
* 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.mongodb.spark
import scala.reflect.ClassTag
import org.apache.spark.SparkContext
import org.bson.Document
import com.mongodb.spark.DefaultHelper.DefaultsTo
import com.mongodb.spark.annotation.DeveloperApi
import com.mongodb.spark.config.ReadConfig
import com.mongodb.spark.rdd.MongoRDD
/**
* :: DeveloperApi ::
*
* Helpers to create [[com.mongodb.spark.rdd.MongoRDD]] in the current `SparkContext`.
*
* @param sc the Spark context
* @since 1.0
*/
@DeveloperApi
case class SparkContextFunctions(@transient sc: SparkContext) extends Serializable {
/**
* Creates a MongoRDD
*
* Defaults to using the `SparkConf` for configuration, alternatively supply a [[com.mongodb.spark.config.ReadConfig]].
*
* @param readConfig the optional readConfig
* @tparam D the type of Document to return from MongoDB - defaults to Document
* @return a MongoRDD
*/
def loadFromMongoDB[D: ClassTag](readConfig: ReadConfig = ReadConfig(sc))(implicit e: D DefaultsTo Document): MongoRDD[D] =
MongoSpark.builder().sparkContext(sc).readConfig(readConfig).build().toRDD[D]()
}