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SudokuSolver.scala
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SudokuSolver.scala
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package org.lunatechlabs.dotty.sudoku
import akka.actor.typed.receptionist.{ Receptionist, ServiceKey }
import akka.actor.typed.scaladsl.{ ActorContext, Behaviors, StashBuffer }
import akka.actor.typed.{ ActorRef, Behavior, SupervisorStrategy }
import scala.concurrent.duration._
final case class SudokuField(sudoku: Sudoku)
object SudokuSolver:
// SudokuSolver Protocol
enum Command:
case InitialRowUpdates(rowUpdates: Vector[SudokuDetailProcessor.RowUpdate],
replyTo: ActorRef[SudokuSolver.Response])
export Command._
// My Responses
enum Response:
case SudokuSolution(sudoku: Sudoku)
export Response._
type CommandAndResponses = Command | SudokuDetailProcessor.Response | SudokuProgressTracker.Response
import SudokuDetailProcessor.UpdateSender
def genDetailProcessors[A <: SudokoDetailType: UpdateSender](
context: ActorContext[CommandAndResponses]
): Map[Int, ActorRef[SudokuDetailProcessor.Command]] =
import scala.language.implicitConversions
cellIndexesVector
.map { index =>
val detailProcessorName = summon[UpdateSender[A]].processorName(index)
val detailProcessor = context.spawn(SudokuDetailProcessor(index), detailProcessorName)
(index, detailProcessor)
}
.to(Map)
def apply(sudokuSolverSettings: SudokuSolverSettings): Behavior[Command] =
Behaviors
.supervise[CommandAndResponses] {
Behaviors.withStash(capacity = sudokuSolverSettings.SudokuSolver.StashBufferSize) {
buffer =>
Behaviors.setup { context =>
new SudokuSolver(context, buffer).idle()
}
}
}
.onFailure[Exception](
SupervisorStrategy
.restartWithBackoff(minBackoff = 5.seconds, maxBackoff = 1.minute, randomFactor = 0.2)
).narrow
class SudokuSolver private (context: ActorContext[SudokuSolver.CommandAndResponses],
buffer: StashBuffer[SudokuSolver.CommandAndResponses]
):
import CellMappings._
import SudokuSolver._
private val rowDetailProcessors = genDetailProcessors[Row](context)
private val columnDetailProcessors = genDetailProcessors[Column](context)
private val blockDetailProcessors = genDetailProcessors[Block](context)
private val allDetailProcessors =
List(rowDetailProcessors, columnDetailProcessors, blockDetailProcessors)
private val progressTracker =
context.spawn(SudokuProgressTracker(rowDetailProcessors, context.self),
"sudoku-progress-tracker"
)
def idle(): Behavior[CommandAndResponses] =
Behaviors.receiveMessage {
case InitialRowUpdates(rowUpdates, sender) =>
rowUpdates.foreach {
case SudokuDetailProcessor.RowUpdate(row, cellUpdates) =>
rowDetailProcessors(row) ! SudokuDetailProcessor.Update(cellUpdates, context.self)
}
progressTracker ! SudokuProgressTracker.NewUpdatesInFlight(rowUpdates.size)
processRequest(Some(sender), System.currentTimeMillis())
case unexpectedMsg =>
context.log.error("Received an unexpected message in 'idle' state: {}", unexpectedMsg)
Behaviors.same
}
def processRequest(requestor: Option[ActorRef[Response]], startTime: Long): Behavior[CommandAndResponses] =
Behaviors.receiveMessage {
case SudokuDetailProcessor.RowUpdate(rowNr, updates) =>
updates.foreach { (rowCellNr, newCellContent) =>
val (columnNr, columnCellNr) = rowToColumnCoordinates(rowNr, rowCellNr)
val columnUpdate = CellUpdates(columnCellNr -> newCellContent)
columnDetailProcessors(columnNr) ! SudokuDetailProcessor.Update(columnUpdate, context.self)
val (blockNr, blockCellNr) = rowToBlockCoordinates(rowNr, rowCellNr)
val blockUpdate = CellUpdates(blockCellNr -> newCellContent)
blockDetailProcessors(blockNr) ! SudokuDetailProcessor.Update(blockUpdate, context.self)
}
progressTracker ! SudokuProgressTracker.NewUpdatesInFlight(2 * updates.size - 1)
Behaviors.same
case SudokuDetailProcessor.ColumnUpdate(columnNr, updates) =>
updates.foreach { (colCellNr, newCellContent) =>
val (rowNr, rowCellNr) = columnToRowCoordinates(columnNr, colCellNr)
val rowUpdate = CellUpdates(rowCellNr -> newCellContent)
rowDetailProcessors(rowNr) ! SudokuDetailProcessor.Update(rowUpdate, context.self)
val (blockNr, blockCellNr) = columnToBlockCoordinates(columnNr, colCellNr)
val blockUpdate = CellUpdates(blockCellNr -> newCellContent)
blockDetailProcessors(blockNr) ! SudokuDetailProcessor.Update(blockUpdate, context.self)
}
progressTracker ! SudokuProgressTracker.NewUpdatesInFlight(2 * updates.size - 1)
Behaviors.same
case SudokuDetailProcessor.BlockUpdate(blockNr, updates) =>
updates.foreach { (blockCellNr, newCellContent) =>
val (rowNr, rowCellNr) = blockToRowCoordinates(blockNr, blockCellNr)
val rowUpdate = CellUpdates(rowCellNr -> newCellContent)
rowDetailProcessors(rowNr) ! SudokuDetailProcessor.Update(rowUpdate, context.self)
val (columnNr, columnCellNr) = blockToColumnCoordinates(blockNr, blockCellNr)
val columnUpdate = CellUpdates(columnCellNr -> newCellContent)
columnDetailProcessors(columnNr) ! SudokuDetailProcessor.Update(columnUpdate, context.self)
}
progressTracker ! SudokuProgressTracker.NewUpdatesInFlight(2 * updates.size - 1)
Behaviors.same
case unchanged @ SudokuDetailProcessor.SudokuDetailUnchanged =>
progressTracker ! SudokuProgressTracker.NewUpdatesInFlight(-1)
Behaviors.same
case SudokuProgressTracker.Result(sudoku) =>
context.log.info(
s"Sudoku processing time: ${System.currentTimeMillis() - startTime} milliseconds"
)
requestor.get ! SudokuSolution(sudoku)
resetAllDetailProcessors()
buffer.unstashAll(idle())
case msg: InitialRowUpdates if buffer.isFull =>
context.log.info(s"DROPPING REQUEST")
Behaviors.same
case msg: InitialRowUpdates =>
buffer.stash(msg)
Behaviors.same
}
private def resetAllDetailProcessors(): Unit =
for
processors <- allDetailProcessors
(_, processor) <- processors
do processor ! SudokuDetailProcessor.ResetSudokuDetailState