52 lines
1.6 KiB
Scala
52 lines
1.6 KiB
Scala
package eu.dnetlib.doiboost.crossref
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import eu.dnetlib.dhp.application.ArgumentApplicationParser
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import org.apache.hadoop.io.compress.GzipCodec
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import org.apache.spark.sql.SparkSession
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import org.apache.spark.{SparkConf, SparkContext}
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import org.json4s
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import org.json4s.DefaultFormats
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import org.json4s.JsonAST.JArray
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import org.json4s.jackson.JsonMethods.{compact, parse, render}
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import org.slf4j.{Logger, LoggerFactory}
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import scala.io.Source
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object UnpackCrtossrefEntries {
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val log: Logger = LoggerFactory.getLogger(UnpackCrtossrefEntries.getClass)
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def extractDump(input: String): List[String] = {
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implicit lazy val formats: DefaultFormats.type = org.json4s.DefaultFormats
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lazy val json: json4s.JValue = parse(input)
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val a = (json \ "items").extract[JArray]
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a.arr.map(s => compact(render(s)))
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}
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def main(args: Array[String]): Unit = {
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val conf = new SparkConf
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val parser = new ArgumentApplicationParser(Source.fromInputStream(getClass.getResourceAsStream("/eu/dnetlib/dhp/doiboost/crossref_dump_reader/generate_dataset_params.json")).mkString)
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parser.parseArgument(args)
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val master = parser.get("master")
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val sourcePath = parser.get("sourcePath")
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val targetPath = parser.get("targetPath")
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val spark: SparkSession = SparkSession.builder().config(conf)
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.appName(UnpackCrtossrefEntries.getClass.getSimpleName)
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.master(master)
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.getOrCreate()
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val sc: SparkContext = spark.sparkContext
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sc.wholeTextFiles(sourcePath, 6000).flatMap(d => extractDump(d._2))
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.saveAsTextFile(targetPath, classOf[GzipCodec])
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}
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}
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