Class/Object

akka.cluster.ddata

PNCounter

Related Docs: object PNCounter | package ddata

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final class PNCounter extends DeltaReplicatedData with ReplicatedDelta with ReplicatedDataSerialization with RemovedNodePruning

Implements a 'Increment/Decrement Counter' CRDT, also called a 'PN-Counter'.

It is described in the paper A comprehensive study of Convergent and Commutative Replicated Data Types.

PN-Counters allow the counter to be incremented by tracking the increments (P) separate from the decrements (N). Both P and N are represented as two internal GCounters. Merge is handled by merging the internal P and N counters. The value of the counter is the value of the P counter minus the value of the N counter.

This class is immutable, i.e. "modifying" methods return a new instance.

Annotations
@SerialVersionUID()
Source
PNCounter.scala
Linear Supertypes
RemovedNodePruning, ReplicatedDataSerialization, Serializable, Serializable, ReplicatedDelta, DeltaReplicatedData, ReplicatedData, AnyRef, Any
Type Hierarchy
Ordering
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  2. By Inheritance
Inherited
  1. PNCounter
  2. RemovedNodePruning
  3. ReplicatedDataSerialization
  4. Serializable
  5. Serializable
  6. ReplicatedDelta
  7. DeltaReplicatedData
  8. ReplicatedData
  9. AnyRef
  10. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Visibility
  1. Public
  2. All

Type Members

  1. type D = PNCounter

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    The type of the delta.

    The type of the delta. To be specified by subclass. It may be the same type as T or a different type if needed. For example GSet uses the same type and ORSet uses different types.

    Definition Classes
    PNCounter → DeltaReplicatedData

  2. type T = PNCounter

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    The type of the concrete implementation, e.g.

    The type of the concrete implementation, e.g. GSet[A]. To be specified by subclass.

    Definition Classes
    PNCounter → ReplicatedData

Value Members

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

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    Definition Classes
    AnyRef → Any

  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any

  3. def +(n: Long)(implicit node: Cluster): PNCounter

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    Increment the counter with the delta n specified.

    Increment the counter with the delta n specified. If the delta is negative then it will decrement instead of increment.

  4. def -(n: Long)(implicit node: Cluster): PNCounter

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    Decrement the counter with the delta n specified.

    Decrement the counter with the delta n specified. If the delta is negative then it will increment instead of decrement.

  5. def ->[B](y: B): (PNCounter, B)

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    Implicit information
    This member is added by an implicit conversion from PNCounter to ArrowAssoc[PNCounter] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()

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

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    Definition Classes
    AnyRef → Any

  7. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any

  8. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  9. def decrement(node: Cluster, n: Long = 1): PNCounter

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    Decrement the counter with the delta n specified.

    Decrement the counter with the delta n specified. If the delta n is negative then it will increment instead of decrement.

  10. def delta: Option[PNCounter]

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    The accumulated delta of mutator operations since previous #resetDelta.

    The accumulated delta of mutator operations since previous #resetDelta. When the Replicator invokes the modify function of the Update message and the user code is invoking one or more mutator operations the data is collecting the delta of the operations and makes it available for the Replicator with the #delta accessor. The modify function shall still return the full state in the same way as ReplicatedData without support for deltas.

    Definition Classes
    PNCounter → DeltaReplicatedData

  11. def ensuring(cond: (PNCounter) ⇒ Boolean, msg: ⇒ Any): PNCounter

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    Implicit information
    This member is added by an implicit conversion from PNCounter to Ensuring[PNCounter] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring

  12. def ensuring(cond: (PNCounter) ⇒ Boolean): PNCounter

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    Implicit information
    This member is added by an implicit conversion from PNCounter to Ensuring[PNCounter] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring

  13. def ensuring(cond: Boolean, msg: ⇒ Any): PNCounter

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    Implicit information
    This member is added by an implicit conversion from PNCounter to Ensuring[PNCounter] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring

  14. def ensuring(cond: Boolean): PNCounter

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    Implicit information
    This member is added by an implicit conversion from PNCounter to Ensuring[PNCounter] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring

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

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    Definition Classes
    AnyRef

  16. def equals(o: Any): Boolean

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    Definition Classes
    PNCounter → AnyRef → Any

  17. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )

  18. def formatted(fmtstr: String): String

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    Implicit information
    This member is added by an implicit conversion from PNCounter to StringFormat[PNCounter] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()

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

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    Definition Classes
    AnyRef → Any

  20. def getValue: BigInteger

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    Java API: Current total value of the counter.

  21. def hashCode(): Int

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    Definition Classes
    PNCounter → AnyRef → Any

  22. def increment(node: Cluster, n: Long = 1): PNCounter

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    Increment the counter with the delta n specified.

    Increment the counter with the delta n specified. If the delta is negative then it will decrement instead of increment.

  23. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any

  24. def merge(that: PNCounter): PNCounter

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    Monotonic merge function.

    Monotonic merge function.

    Definition Classes
    PNCounter → ReplicatedData

  25. def mergeDelta(thatDelta: PNCounter): PNCounter

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    When delta is merged into the full state this method is used.

    When delta is merged into the full state this method is used. When the type D of the delta is of the same type as the full state T this method can be implemented by delegating to merge.

    Definition Classes
    PNCounter → DeltaReplicatedData

  26. def modifiedByNodes: Set[UniqueAddress]

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    The nodes that have changed the state for this data and would need pruning when such node is no longer part of the cluster.

    The nodes that have changed the state for this data and would need pruning when such node is no longer part of the cluster.

    Definition Classes
    PNCounter → RemovedNodePruning

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

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    Definition Classes
    AnyRef

  28. def needPruningFrom(removedNode: UniqueAddress): Boolean

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    Does it have any state changes from a specific node, which has been removed from the cluster.

    Does it have any state changes from a specific node, which has been removed from the cluster.

    Definition Classes
    PNCounter → RemovedNodePruning

  29. final def notify(): Unit

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    Definition Classes
    AnyRef

  30. final def notifyAll(): Unit

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    Definition Classes
    AnyRef

  31. def prune(removedNode: UniqueAddress, collapseInto: UniqueAddress): PNCounter

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    When the removed node has been removed from the cluster the state changes from that node will be pruned by collapsing the data entries to another node.

    When the removed node has been removed from the cluster the state changes from that node will be pruned by collapsing the data entries to another node.

    Definition Classes
    PNCounter → RemovedNodePruning

  32. def pruningCleanup(removedNode: UniqueAddress): PNCounter

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    Remove data entries from a node that has been removed from the cluster and already been pruned.

    Remove data entries from a node that has been removed from the cluster and already been pruned.

    Definition Classes
    PNCounter → RemovedNodePruning

  33. def resetDelta: PNCounter

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    Reset collection of deltas from mutator operations.

    Reset collection of deltas from mutator operations. When the Replicator invokes the modify function of the Update message the delta is always "reset" and when the user code is invoking one or more mutator operations the data is collecting the delta of the operations and makes it available for the Replicator with the #delta accessor. When the Replicator has grabbed the delta it will invoke this method to get a clean data instance without the delta.

    Definition Classes
    PNCounter → DeltaReplicatedData

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

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    Definition Classes
    AnyRef

  35. def toString(): String

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    Definition Classes
    PNCounter → AnyRef → Any

  36. def value: BigInt

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    Scala API: Current total value of the counter.

  37. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

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

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

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

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  40. def zero: PNCounter

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    The empty full state.

    The empty full state. This is used when a delta is received and no existing full state exists on the receiving side. Then the delta is merged into the zero to create the initial full state.

    Definition Classes
    PNCounter → ReplicatedDelta

  41. def →[B](y: B): (PNCounter, B)

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    Implicit information
    This member is added by an implicit conversion from PNCounter to ArrowAssoc[PNCounter] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Shadowed Implicit Value Members

  1. def +(other: String): String

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    Implicit information
    This member is added by an implicit conversion from PNCounter to any2stringadd[PNCounter] performed by method any2stringadd in scala.Predef.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (pNCounter: any2stringadd[PNCounter]).+(other)
    Definition Classes
    any2stringadd

Inherited from RemovedNodePruning

Inherited from ReplicatedDataSerialization

Inherited from Serializable

Inherited from Serializable

Inherited from ReplicatedDelta

Inherited from DeltaReplicatedData

Inherited from ReplicatedData

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from PNCounter to any2stringadd[PNCounter]

Inherited by implicit conversion StringFormat from PNCounter to StringFormat[PNCounter]

Inherited by implicit conversion Ensuring from PNCounter to Ensuring[PNCounter]

Inherited by implicit conversion ArrowAssoc from PNCounter to ArrowAssoc[PNCounter]

Ungrouped