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| def updateIndexFiles(newFile: IndexPage.File) = | |
| for { | |
| _ <- logger.info("Retrieving index page") | |
| files <- getIndexByNamePage.map(IndexPage.parseFiles) | |
| _ <- logger.info(s"Retrieved index page with ${files.size} files") | |
| _ <- uploadNewIndexFiles(files, newFile) | |
| } yield () | |
| def uploadNewIndexFiles(files: List[IndexPage.File], newFile: IndexPage.File) = { | |
| val newFiles = files.toSet + newFile |
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| def safeUpdateIndexFiles(newFile: IndexPage.File) = | |
| leaseRepository | |
| .acquire(LeaseID(ks"file-uploader"), HolderID.unique) | |
| .use(_.guard(updateIndexFiles(newFile)).map(_.embedError)) |
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| trait LeaseRepository[F[_]]: | |
| def labels: List[Label] | |
| def acquire(id: LeaseID, holderID: HolderID, annotations: List[Annotation] = Nil)(implicit | |
| parameters: LeaseParameters = LeaseParameters.Default | |
| ): Resource[F, HeldLease[F]] | |
| def get(id: LeaseID): F[Option[Lease[F]]] | |
| def list: F[List[Lease[F]]] | |
| def watcher: fs2.Stream[F, LeaseEvent[F]] |
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| trait Lease[F[_]]: | |
| def id: LeaseID | |
| def holder: F[HolderID] | |
| def labels: F[List[Label]] | |
| def annotations: F[List[Annotation]] | |
| def isExpired: F[Boolean] | |
| def expired: fs2.Stream[F, Unit] |
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| def prepare(transferID: TransferID, transfer: Transfer): F[Branch.Vote[TransferFailure]] = { | |
| if (accountID === transfer.origin) | |
| Logger[F].debug(show"Preparing outgoing transfer $transferID: $transfer for account $accountID") >> | |
| account.prepareOutgoingTransfer(transferID, transfer) | |
| .onErrorRetryWithBackoff(Logger[F].warn(_)(show"Error preparing outgoing transfer $transferID, retrying in a bit")) | |
| .onLeftRetryWithBackoff { case Account.PendingOutgoingTransfer => | |
| Logger[F].warn(show"Account $accountID has a pending outgoing transfer, retrying in a bit") | |
| }(retryParameters.onPendingTransfer) | |
| .flatMap { | |
| case Left(Account.Unknown) => Branch.Vote.Abort(TransferFailure.AccountNotFound(accountID)).pure[F] |
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| def transfer(from: AccountID, to: AccountID, amount: PosAmount): F[TransferFailure \/ Unit] = | |
| coordinator | |
| .create(TransferID.random, Transfer(from, to, amount), from, to) | |
| .use(_.pollForFinalStatus()) | |
| .flatMap { | |
| case Status.Committed => ().asRight[TransferFailure].pure | |
| case Status.Aborted(reason) => | |
| reason match { | |
| case AbortReason.Timeout => | |
| EitherT.leftT(TransferFailure.Timeout: TransferFailure).value |
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| transactor.coordinator[TransferID, AccountID, Transfer, TransferFailure]( | |
| "transfer", | |
| { accountID => | |
| val account = sharding.entityFor(accountID) | |
| new TransferBranch(accountID, account) | |
| }, | |
| Some(transferParameters.timeout) | |
| ) |
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| trait Branch[F[_], TID, Q, R] | |
| def prepare(id: TID, query: Q): F[Vote[R]] | |
| def commit(id: TID): F[Unit] | |
| def abort(id: TID): F[Unit] |
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| Example: orchestration of the booking process for a journey - prepare phase | Data store | Transaction branch operation | |
|---|---|---|---|
| Create cancelable hotel & flight reservations | External API | Make a reversible synchronous HTTP POST/PUT request | |
| Request the billing backend for the credit card guarantee charge and await confirmation | Internal service | Send a message or call an endpoint and wait for an event to occur | |
| Add details to the customer row in the database | Database | Acquire an exclusive lock on a database row or use builtin XA support | |
| Grab a semaphore to update the recent bookings cache | In-memory resource | Lock an in-memory resource | |
| Schedule traveller reminder notifications | Actor cluster | Send a command to an actor | |
| Add an entry in a bookings log | File | Persist a rollback-ready change in a file |
jchapuis
/ Differ.scala
Created
May 25, 2021 12:02
Generic LCS diffing in Scala (dynamic programming with memoization)
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| import cats.{ Eq, Show } | |
| import cats.syntax.eq._ | |
| import cats.syntax.show._ | |
| import cats.instances.int._ | |
| import FunctionHelpers._ | |
| object Differ { | |
| sealed trait Diff[T] | |
| object Diff { | |
| final case class Insert[T](revision: T) extends Diff[T] |
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