Packages

class SequencerWriter extends NamedLogging with FlagCloseableAsync

The Writer component is in practice a little state machine that will run crash recovery on startup then create a running SequencerWriterSource. If this materialized Sequencer flow then crashes with an exception that can be recovered by running crash recovery it will then go through this process and attempt to restart the flow.

Callers must call start to start the writer and will likely have to wait for this completing before accepting calls for the sequencer to direct at send. Note that the crash recovery steps may take a long duration to run:

  • we delete invalid events previously written by the sequencer and then attempt to insert a new online watermark, and these database queries may simply take a long time to run.
  • the SequencerWriter will wait until our clock has reached the new online watermark timestamp before starting the writer to ensure that no events before this timestamp are written. If this online watermark is significantly ahead of the current clock value it will just wait until this is reached. In practice assuming all sequencers in the local topology are kept in sync through NTP or similar, this duration should be very small (<1s).
Linear Supertypes
FlagCloseableAsync, FlagCloseable, AutoCloseable, NamedLogging, AnyRef, Any
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Inherited
  1. SequencerWriter
  2. FlagCloseableAsync
  3. FlagCloseable
  4. AutoCloseable
  5. NamedLogging
  6. AnyRef
  7. Any
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Visibility
  1. Public
  2. Protected

Instance Constructors

  1. new SequencerWriter(writerStoreFactory: SequencerWriterStoreFactory, createWriterFlow: (SequencerWriterStore, TraceContext) => RunningSequencerWriterFlow, storage: Storage, generalStore: SequencerStore, clock: Clock, expectedCommitMode: Option[CommitMode], timeouts: ProcessingTimeout, loggerFactory: NamedLoggerFactory)(implicit executionContext: ExecutionContext)

Type Members

  1. case class ReaderState(count: Int, readers: MultiSet[String]) extends Product with Serializable
    Definition Classes
    FlagCloseable

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native() @HotSpotIntrinsicCandidate()
  6. final def close(): Unit

    Blocks until all earlier tasks have completed and then prevents further tasks from being run.

    Blocks until all earlier tasks have completed and then prevents further tasks from being run.

    Definition Classes
    FlagCloseable → AutoCloseable
    Annotations
    @SuppressWarnings()
  7. def closeAsync(): Seq[AsyncOrSyncCloseable]

    closeAsync asynchronously releases resources held by a future

    closeAsync asynchronously releases resources held by a future

    returns

    an ordered sequence of async and sync closeables with async closeables made up of future and timeout

    Attributes
    protected
    Definition Classes
    SequencerWriter → FlagCloseableAsync
  8. def closingTimeout: FiniteDuration
    Attributes
    protected
    Definition Classes
    FlagCloseable
  9. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  10. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  11. implicit def errorLoggingContext(implicit traceContext: TraceContext): ErrorLoggingContext
    Attributes
    protected
    Definition Classes
    NamedLogging
  12. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  13. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  14. def internalPerformUnlessClosingF[A](name: String)(f: => Future[A])(implicit ec: ExecutionContext, traceContext: TraceContext): UnlessShutdown[Future[A]]
    Attributes
    protected
    Definition Classes
    FlagCloseable
  15. def isClosing: Boolean

    Check whether we're closing.

    Check whether we're closing. Susceptible to race conditions; unless you're using using this as a flag to the retry lib or you really know what you're doing, prefer performUnlessClosing and friends.

    Definition Classes
    FlagCloseable
  16. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  17. def keepTrackOfOpenFutures: Boolean

    track running futures on shutdown

    track running futures on shutdown

    set to true to get detailed information about all futures that did not complete during shutdown. if set to false, we don't do anything.

    Attributes
    protected
    Definition Classes
    FlagCloseable
  18. def logger: TracedLogger
    Attributes
    protected
    Definition Classes
    NamedLogging
  19. val loggerFactory: NamedLoggerFactory
    Attributes
    protected
    Definition Classes
    SequencerWriter → NamedLogging
  20. def maxSleepMillis: Long
    Attributes
    protected
    Definition Classes
    FlagCloseable
  21. implicit def namedLoggingContext(implicit traceContext: TraceContext): NamedLoggingContext
    Attributes
    protected
    Definition Classes
    NamedLogging
  22. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  23. def noTracingLogger: Logger
    Attributes
    protected
    Definition Classes
    NamedLogging
  24. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  25. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  26. final def onClosed(): Unit
    Definition Classes
    FlagCloseableAsync → FlagCloseable
  27. def performUnlessClosing[A](name: String)(f: => A)(implicit traceContext: TraceContext): UnlessShutdown[A]

    Performs the task given by f unless a shutdown has been initiated.

    Performs the task given by f unless a shutdown has been initiated. The shutdown will only begin after f completes, but other tasks may execute concurrently with f, if started using this function, or one of the other variants (performUnlessClosingF and performUnlessClosingEitherT). The tasks are assumed to take less than closingTimeout to complete.

    DO NOT CALL this.close as part of f, because it will result in a deadlock.

    f

    The task to perform

    returns

    scala.None$ if a shutdown has been initiated. Otherwise the result of the task.

    Definition Classes
    FlagCloseable
  28. def performUnlessClosingEitherT[E, R](name: String, onClosing: => E)(etf: => EitherT[Future, E, R])(implicit ec: ExecutionContext, traceContext: TraceContext): EitherT[Future, E, R]

    Performs the EitherT[Future] given by etf unless a shutdown has been initiated, in which case the provided error is returned instead.

    Performs the EitherT[Future] given by etf unless a shutdown has been initiated, in which case the provided error is returned instead. Both etf and the error are lazy; etf is only evaluated if there is no shutdown, the error only if we're shutting down. The shutdown will only begin after etf completes, but other tasks may execute concurrently with etf, if started using this function, or one of the other variants (performUnlessClosing and performUnlessClosingF). The tasks are assumed to take less than closingTimeout to complete.

    DO NOT CALL this.close as part of etf, because it will result in a deadlock.

    etf

    The task to perform

    Definition Classes
    FlagCloseable
  29. def performUnlessClosingEitherTF[E, R](name: String, onClosing: => E)(etf: => EitherT[Future, E, Future[R]])(implicit ec: ExecutionContext, traceContext: TraceContext): EitherT[Future, E, Future[R]]
    Definition Classes
    FlagCloseable
  30. def performUnlessClosingEitherU[E, R](name: String)(etf: => EitherT[Future, E, R])(implicit ec: ExecutionContext, traceContext: TraceContext): EitherT[FutureUnlessShutdown, E, R]
    Definition Classes
    FlagCloseable
  31. def performUnlessClosingF[A](name: String)(f: => Future[A])(implicit ec: ExecutionContext, traceContext: TraceContext): FutureUnlessShutdown[A]

    Performs the Future given by f unless a shutdown has been initiated.

    Performs the Future given by f unless a shutdown has been initiated. The future is lazy and not evaluated during shutdown. The shutdown will only begin after f completes, but other tasks may execute concurrently with f, if started using this function, or one of the other variants (performUnlessClosing and performUnlessClosingEitherT). The tasks are assumed to take less than closingTimeout to complete.

    DO NOT CALL this.close as part of f, because it will result in a deadlock.

    f

    The task to perform

    returns

    The future completes with com.digitalasset.canton.lifecycle.UnlessShutdown.AbortedDueToShutdown if a shutdown has been initiated. Otherwise the result of the task wrapped in com.digitalasset.canton.lifecycle.UnlessShutdown.Outcome.

    Definition Classes
    FlagCloseable
  32. def performUnlessClosingUSF[A](name: String)(f: => FutureUnlessShutdown[A])(implicit ec: ExecutionContext, traceContext: TraceContext): FutureUnlessShutdown[A]
    Definition Classes
    FlagCloseable
  33. def runOnShutdown[T](task: RunOnShutdown)(implicit traceContext: TraceContext): Unit

    Register a task that will run onClose after all "performUnlessShutdown" tasks have finished

    Register a task that will run onClose after all "performUnlessShutdown" tasks have finished

    Definition Classes
    FlagCloseable
  34. def runStateChanged(waitingState: Boolean = false): Unit
    Attributes
    protected
    Definition Classes
    FlagCloseable
    Annotations
    @VisibleForTesting()
  35. def send(submission: SubmissionRequest)(implicit traceContext: TraceContext): EitherT[Future, SendAsyncError, Unit]
  36. def start()(implicit traceContext: TraceContext): EitherT[Future, WriterStartupError, Unit]
  37. def startOrLogError()(implicit traceContext: TraceContext): Future[Unit]

    The startup of a SequencerWriter can fail at runtime.

    The startup of a SequencerWriter can fail at runtime. Currently if this occurs we will log a message at error level but as we have no ability to forcibly crash the node we will likely continue running in an unhealthy state. This will however be visible to anyone calling the status operation and could be used by a process monitor to externally restart the sequencer.

  38. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  39. val timeouts: ProcessingTimeout
    Attributes
    protected
    Definition Classes
    SequencerWriter → FlagCloseable
  40. def toString(): String
    Definition Classes
    AnyRef → Any
  41. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  42. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  43. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  44. object ReaderState extends Serializable
    Definition Classes
    FlagCloseable

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable]) @Deprecated
    Deprecated

Inherited from FlagCloseableAsync

Inherited from FlagCloseable

Inherited from AutoCloseable

Inherited from NamedLogging

Inherited from AnyRef

Inherited from Any

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