org.apache.spark.sql.streaming.eventhubs.EventHubsOffset.scala Maven / Gradle / Ivy
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.spark.sql.streaming.eventhubs
import org.apache.spark.eventhubs.common.NameAndPartition
import org.apache.spark.sql.execution.streaming.Offset
import org.json4s.NoTypeHints
import org.json4s.jackson.Serialization
import scala.collection.mutable
import scala.util.control.NonFatal
// the descriptor of EventHubsBatchRecord to communicate with StreamExecution
private[streaming] case class EventHubsBatchRecord(batchId: Long,
targetSeqNums: Map[NameAndPartition, Long])
extends Offset {
override def json: String = JsonUtils.partitionAndSeqNum(batchId, targetSeqNums)
}
private object JsonUtils {
private implicit val formats = Serialization.formats(NoTypeHints)
def partitionAndSeqNum(batchId: Long, seqNums: Map[NameAndPartition, Long]): String = {
val convertedStringIndexedMap = new mutable.HashMap[String, Long]
seqNums.foreach {
case (eventHubNameAndPartition, offsetAndSeqNum) =>
convertedStringIndexedMap += eventHubNameAndPartition.toString -> offsetAndSeqNum
}
Serialization.write((batchId, convertedStringIndexedMap.toMap))
}
def partitionAndSeqNum(jsonStr: String): EventHubsBatchRecord = {
try {
val deserializedTuple = Serialization.read[(Int, Map[String, Long])](jsonStr)
val batchId = deserializedTuple._1
EventHubsBatchRecord(batchId, deserializedTuple._2.map {
case (ehNameAndPartitionStr, seqNum) =>
(NameAndPartition.fromString(ehNameAndPartitionStr), seqNum)
})
} catch {
case NonFatal(_) =>
throw new IllegalArgumentException(s"failed to parse $jsonStr")
}
}
def partitionOffsetAndSeqNums(batchId: Long,
offsets: Map[NameAndPartition, (Long, Long)]): String = {
val convertedStringIndexedMap = new mutable.HashMap[String, (Long, Long)]
offsets.foreach {
case (eventHubNameAndPartition, offsetAndSeqNum) =>
convertedStringIndexedMap += eventHubNameAndPartition.toString -> offsetAndSeqNum
}
Serialization.write((batchId, convertedStringIndexedMap))
}
}
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