LockRepository

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.

Linear Supertypes

AnyRef, Any

Instance Constructors

new LockRepository(session: Session, lockTypes: LockTypes)

Value Members

final def !=(arg0: Any): Boolean

Definition Classes
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final def ##(): Int

Definition Classes
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final def ==(arg0: Any): Boolean

Definition Classes
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def acquireLock(jobType: JobType, jobId: UUID, ttl: Duration = 60 seconds)(implicit ec: ExecutionContext): Future[Boolean]
final def asInstanceOf[T0]: T0

Definition Classes
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def clear(): Future[ResultSet]
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
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Annotations
@throws( ... )
def delete(jobType: JobType): Future[ResultSet]

Delete lock for the given job type.
final def eq(arg0: AnyRef): Boolean

Definition Classes
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def equals(arg0: Any): Boolean

Definition Classes
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def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
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Annotations
@throws( classOf[java.lang.Throwable] )
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
final def getClass(): Class[_]

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

jobType
the job type of the job, e.g. "product_full_import"
def hashCode(): Int

Definition Classes
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final def isInstanceOf[T0]: Boolean

Definition Classes
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final def ne(arg0: AnyRef): Boolean

Definition Classes
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final def notify(): Unit

Definition Classes
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final def notifyAll(): Unit

Definition Classes
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def releaseLock(jobType: JobType, jobId: UUID)(implicit ec: ExecutionContext): Future[Boolean]
def save(jobType: JobType): Future[ResultSet]
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
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def toString(): String

Definition Classes
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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
final def wait(): Unit

Definition Classes
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Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
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Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
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Annotations
@throws( ... )

Related Doc: package hajobs

class LockRepository extends AnyRef

Instance Constructors

new LockRepository(session: Session, lockTypes: LockTypes)

Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

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

final def asInstanceOf[T0]: T0

def clear(): Future[ResultSet]

def clone(): AnyRef

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

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

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

final def getClass(): Class[_]

def getIdForType(jobType: JobType)(implicit ec: ExecutionContext): Future[Option[UUID]]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

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

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

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

def toString(): String

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

final def wait(): Unit

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

final def wait(arg0: Long): Unit

Inherited from AnyRef

Inherited from Any

Ungrouped