de.kaufhof.hajobs

LockRepository

class LockRepository extends AnyRef

This repository manages locks for jobs syncronization in distributed environments. To work every kind of job needs an unique identifier (jobType) and every job run an unique identifier (jobId) If a job acquires a lock, it will only get it, if there isn't already a jobId saved for that jobType. The jobId of the running job will be saved with a ttl to the lock table. A running job needs to renew its lock to show it's still active and not died.

We use Consistency Level Quorum to ensure that a Job is Locked or is not Locked. The CL makes the Lock mechanism more deterministic.

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Instance Constructors

  1. new LockRepository(session: Session, lockTypes: LockTypes)

    session

Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
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  2. final def !=(arg0: Any): Boolean

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  3. final def ##(): Int

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  4. final def ==(arg0: AnyRef): Boolean

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  5. final def ==(arg0: Any): Boolean

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  6. def acquireLock(jobType: JobType, jobId: UUID, ttl: Duration = 60 seconds)(implicit ec: ExecutionContext): Future[Boolean]

  7. final def asInstanceOf[T0]: T0

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  8. def clear(): Future[ResultSet]

  9. def clone(): AnyRef

    Attributes
    protected[java.lang]
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    @throws( ... )

  10. def delete(jobType: JobType): Future[ResultSet]

    Delete lock for the given job type.

  11. final def eq(arg0: AnyRef): Boolean

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  12. def equals(arg0: Any): Boolean

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  13. def finalize(): Unit

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    protected[java.lang]
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    @throws( classOf[java.lang.Throwable] )

  14. def getAll()(implicit ec: ExecutionContext): Future[Seq[Lock]]

    Returns a list of Locks (jobType + jobId).

    Returns a list of Locks (jobType + jobId). To avoid select * statement without key in where clause, we do multiple select statements with given primary key

  15. final def getClass(): Class[_]

    Definition Classes
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  16. def getIdForType(jobType: JobType)(implicit ec: ExecutionContext): Future[Option[UUID]]

    jobType

    the job type of the job, e.g. "product_full_import"

  17. def hashCode(): Int

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  18. final def isInstanceOf[T0]: Boolean

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  19. final def ne(arg0: AnyRef): Boolean

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  20. final def notify(): Unit

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  21. final def notifyAll(): Unit

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  22. def releaseLock(jobType: JobType, jobId: UUID)(implicit ec: ExecutionContext): Future[Boolean]

  23. def save(jobType: JobType): Future[ResultSet]

  24. final def synchronized[T0](arg0: ⇒ T0): T0

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  25. def toString(): String

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  26. def updateLock(jobType: JobType, jobId: UUID, ttl: Duration = 60 seconds)(implicit ec: ExecutionContext): Future[Boolean]

    we use the concept of lightweight transactions (or compare and set, CAS) here as implemented by C* with the PAXOS consensus protocol.

    we use the concept of lightweight transactions (or compare and set, CAS) here as implemented by C* with the PAXOS consensus protocol. see http://www.datastax.com/documentation/cassandra/2.0/cassandra/dml/dml_ltwt_transaction_c.html for more info

  27. final def wait(): Unit

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  28. final def wait(arg0: Long, arg1: Int): Unit

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  29. final def wait(arg0: Long): Unit

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