Jonas Chapuis jchapuis
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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] |
jchapuis
/ reader-compatibility-types.csv
Last active
March 29, 2021 18:54
reader-compatibility-types
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| Reader compatibility type | Intuition | Writer changes allowed | Writer changes forbidden | |
|---|---|---|---|---|
| 'BACKWARD' | Clients can keep decoding the responses for their requests | Add fields & Delete optional fields & Shrink types | Delete fields & Widen types |
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| "DateTimeInterval.relate" should { | |
| "return Disjoint" in new Fixture { | |
| val a = "+---+ " | |
| val b = " +--+" | |
| a.relateTo(b) shouldBe Disjoint | |
| b.relateTo(a) shouldBe Disjoint | |
| } | |
| "return IncludedBy and Includes" in new Fixture { | |
| val a = " +-------+ " |
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| builder | |
| .startSystemDependent(SomeEtcdService()) | |
| .thenStartHttp( | |
| HttpServiceDefinition( | |
| new AkkaControllers().routes, | |
| serverConfig.host, | |
| serverConfig.port, | |
| serverConfig.hardDeadline, | |
| serverConfig.unbindingDelay | |
| ) |
jchapuis
/ tagless.scala
Last active
March 22, 2021 22:29
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| def getBlocksForResource[F[_, _]: BifunctorMonadError: Bilogger] | |
| (resourceID: ResourceID, timeFilter: TimeFilter) | |
| (implicit resourceRepo: ResourceRepo[F], blockRepo: BlockRepo[F]): F[ResourceBlockError, List[Block]] = | |
| (for { | |
| resource <- resourceRepo.get(resourceID) | |
| blocks <- blockRepo.blocksForResource(resource, timeFilter) | |
| _ <- F.info(show"Successfully generated ${blocks.size} blocks for resource $resourceID in interval $timeFilter") | |
| } yield blocks).onLeft { | |
| case repositoryError: RepositoryError => F.error(repositoryError.message) | |
| case blockError: BlockError => F.error(blockError.message) |
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