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Extension of Scala-STM, adding optional durability layer, and providing API for confluent and reactive event layers

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/*
 *  ObjImpl.scala
 *  (Lucre 4)
 *
 *  Copyright (c) 2009-2024 Hanns Holger Rutz. All rights reserved.
 *
 *  This software is published under the GNU Affero General Public License v3+
 *
 *
 *  For further information, please contact Hanns Holger Rutz at
 *  [email protected]
 */

package de.sciss.lucre
package impl

import de.sciss.serial.{DataInput, TFormat}

import scala.annotation.meta.field

object ObjImpl {
  def read[T <: Txn[T]](in: DataInput)(implicit tx: T): Obj[T] = {
    val typeId  = in.readInt()
    val tpe     = getType(typeId)
    tpe.readIdentifiedObj(in)
  }

  implicit def format[T <: Txn[T]]: TFormat[T, Obj[T]] = anyFmt.cast

  @field private[this] final val sync   = new AnyRef
  @field private[this] final val anyFmt = new Fmt[AnyTxn]

  @volatile private var map = Map[Int, Obj.Type](MapObj.typeId -> MapObj)

  def addType(tpe: Obj.Type): Unit = sync.synchronized {
    val typeId = tpe.typeId
    if (map.contains(typeId))
      throw new IllegalArgumentException(
        s"Object type $typeId (0x${typeId.toHexString}) was already registered ($tpe overrides ${map(typeId)})")

    map += typeId -> tpe
  }

  @inline
  def getType(id: Int): Obj.Type = map.getOrElse(id, sys.error(s"Unknown object type $id (0x${id.toHexString})"))

  private final class Fmt[T <: Txn[T]] extends CastTxnFormat[T, Obj] {
    override def readT(in: DataInput)(implicit tx: T): Obj[T] = ObjImpl.read(in)
  }
}