protected def generateUUID()

in core/src/main/scala/org/apache/pekko/persistence/cassandra/journal/CassandraJournal.scala [332:360]

• 24 lines of code
• 9 McCabe index (conditional complexity)

  protected def generateUUID(pr: PersistentRepr): UUID = Uuids.timeBased()

  private def extractTagWrites(serialized: Seq[SerializedAtomicWrite]): BulkTagWrite = {
    if (serialized.isEmpty) BulkTagWrite(Nil, Nil)
    else if (serialized.size == 1 && serialized.head.payload.size == 1) {
      // optimization for one single event, which is the typical case
      val s = serialized.head.payload.head
      if (s.tags.isEmpty) BulkTagWrite(Nil, s :: Nil)
      else BulkTagWrite(s.tags.map(tag => TagWrite(tag, s :: Nil)).toList, Nil)
    } else {
      val messagesByTag: Map[String, Seq[Serialized]] =
        serialized.flatMap(_.payload).flatMap(s => s.tags.map((_, s))).groupBy(_._1).map {
          case (tag, messages) => (tag, messages.map(_._2))
        }
      val messagesWithoutTag =
        for {
          a <- serialized
          b <- a.payload
          if b.tags.isEmpty
        } yield b

      val writesWithTags: immutable.Seq[TagWrite] = messagesByTag.map {
        case (tag, writes) => TagWrite(tag, writes)
      }.toList

      BulkTagWrite(writesWithTags, messagesWithoutTag)
    }

  }