Trait

scala.collection.parallel

Combiner

Related Doc: package parallel

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trait Combiner[-Elem, +To] extends Builder[Elem, To] with Sizing with Parallel

The base trait for all combiners. A combiner incremental collection construction just like a regular builder, but also implements an efficient merge operation of two builders via combine method. Once the collection is constructed, it may be obtained by invoking the result method.

The complexity of the combine method should be less than linear for best performance. The result method doesn't have to be a constant time operation, but may be performed in parallel.

Elem

the type of the elements added to the builder

To

the type of the collection the builder produces

Source
Combiner.scala
Since

2.9

Linear Supertypes
Known Subclasses
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Inherited
  1. Combiner
  2. Parallel
  3. Sizing
  4. Builder
  5. Growable
  6. Clearable
  7. AnyRef
  8. Any
Implicitly
  1. by CollectionsHaveToParArray
  2. by any2stringadd
  3. by StringFormat
  4. by Ensuring
  5. by ArrowAssoc
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Visibility
  1. Public
  2. All

Abstract Value Members

  1. abstract def +=(elem: Elem): Combiner.this.type

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    Adds a single element to the builder.

    Adds a single element to the builder.

    elem

    the element to be added.

    returns

    the builder itself.

    Definition Classes
    BuilderGrowable
  2. abstract def clear(): Unit

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    Clears the contents of this builder.

    Clears the contents of this builder. After execution of this method the builder will contain no elements.

    Definition Classes
    BuilderGrowableClearable
  3. abstract def combine[N <: Elem, NewTo >: To](other: Combiner[N, NewTo]): Combiner[N, NewTo]

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    Combines the contents of the receiver builder and the other builder, producing a new builder containing both their elements.

    Combines the contents of the receiver builder and the other builder, producing a new builder containing both their elements.

    This method may combine the two builders by copying them into a larger collection, by producing a lazy view that gets evaluated once result is invoked, or use a merge operation specific to the data structure in question.

    Note that both the receiver builder and other builder become invalidated after the invocation of this method, and should be cleared (see clear) if they are to be used again.

    Also, combining two combiners c1 and c2 for which c1 eq c2 is true, that is, they are the same objects in memory:

    c1.combine(c2)

    always does nothing and returns c1.

    N

    the type of elements contained by the other builder

    NewTo

    the type of collection produced by the other builder

    other

    the other builder

    returns

    the parallel builder containing both the elements of this and the other builder

  4. abstract def result(): To

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    Produces a collection from the added elements.

    Produces a collection from the added elements. The builder's contents are undefined after this operation.

    returns

    a collection containing the elements added to this builder.

    Definition Classes
    Builder
  5. abstract def size: Int

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    Definition Classes
    Sizing

Concrete Value Members

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

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    Test two objects for inequality.

    Test two objects for inequality.

    returns

    true if !(this == that), false otherwise.

    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    Equivalent to x.hashCode except for boxed numeric types and null.

    Equivalent to x.hashCode except for boxed numeric types and null. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For null returns a hashcode where null.hashCode throws a NullPointerException.

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  3. def +(other: String): String

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    Implicit information
    This member is added by an implicit conversion from Combiner[Elem, To] to any2stringadd[Combiner[Elem, To]] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ++=(xs: TraversableOnce[Elem]): Combiner.this.type

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    adds all elements produced by a TraversableOnce to this growable collection.

    adds all elements produced by a TraversableOnce to this growable collection.

    xs

    the TraversableOnce producing the elements to add.

    returns

    the growable collection itself.

    Definition Classes
    Growable
  5. def +=(elem1: Elem, elem2: Elem, elems: Elem*): Combiner.this.type

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    adds two or more elements to this growable collection.

    adds two or more elements to this growable collection.

    elem1

    the first element to add.

    elem2

    the second element to add.

    elems

    the remaining elements to add.

    returns

    the growable collection itself

    Definition Classes
    Growable
  6. def ->[B](y: B): (Combiner[Elem, To], B)

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    Implicit information
    This member is added by an implicit conversion from Combiner[Elem, To] to ArrowAssoc[Combiner[Elem, To]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  7. final def ==(arg0: Any): Boolean

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    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    AnyRef → Any
  8. var _combinerTaskSupport: TaskSupport

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  9. final def asInstanceOf[T0]: T0

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    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

    ClassCastException if the receiver object is not an instance of the erasure of type T0.

  10. def canBeShared: Boolean

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    Returns true if this combiner has a thread-safe += and is meant to be shared across several threads constructing the collection.

    Returns true if this combiner has a thread-safe += and is meant to be shared across several threads constructing the collection.

    By default, this method returns false.

  11. def clone(): AnyRef

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    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

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

    not specified by SLS as a member of AnyRef

  12. def combinerTaskSupport: TaskSupport

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  13. def combinerTaskSupport_=(cts: TaskSupport): Unit

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  14. def ensuring(cond: (Combiner[Elem, To]) ⇒ Boolean, msg: ⇒ Any): Combiner[Elem, To]

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    Implicit information
    This member is added by an implicit conversion from Combiner[Elem, To] to Ensuring[Combiner[Elem, To]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  15. def ensuring(cond: (Combiner[Elem, To]) ⇒ Boolean): Combiner[Elem, To]

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    Implicit information
    This member is added by an implicit conversion from Combiner[Elem, To] to Ensuring[Combiner[Elem, To]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  16. def ensuring(cond: Boolean, msg: ⇒ Any): Combiner[Elem, To]

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    Implicit information
    This member is added by an implicit conversion from Combiner[Elem, To] to Ensuring[Combiner[Elem, To]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  17. def ensuring(cond: Boolean): Combiner[Elem, To]

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    Implicit information
    This member is added by an implicit conversion from Combiner[Elem, To] to Ensuring[Combiner[Elem, To]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  18. final def eq(arg0: AnyRef): Boolean

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    Tests whether the argument (that) is a reference to the receiver object (this).

    Tests whether the argument (that) is a reference to the receiver object (this).

    The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:

    • It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
    • For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
    • null.eq(null) returns true.

    When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).

    returns

    true if the argument is a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  19. def equals(arg0: Any): Boolean

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    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to eq.

    See also equals in scala.Any.

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    AnyRef → Any
  20. def finalize(): Unit

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    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

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

    not specified by SLS as a member of AnyRef

  21. def formatted(fmtstr: String): String

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    Returns string formatted according to given format string.

    Returns string formatted according to given format string. Format strings are as for String.format (@see java.lang.String.format).

    Implicit information
    This member is added by an implicit conversion from Combiner[Elem, To] to StringFormat[Combiner[Elem, To]] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  22. final def getClass(): Class[_]

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    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

    a representation that corresponds to the dynamic class of the receiver object.

    Definition Classes
    AnyRef → Any
    Note

    not specified by SLS as a member of AnyRef

  23. def hashCode(): Int

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    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

    the hash code value for this object.

    Definition Classes
    AnyRef → Any
  24. final def isInstanceOf[T0]: Boolean

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    Test whether the dynamic type of the receiver object is T0.

    Test whether the dynamic type of the receiver object is T0.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

    true if the receiver object is an instance of erasure of type T0; false otherwise.

    Definition Classes
    Any
  25. def mapResult[NewTo](f: (To) ⇒ NewTo): Builder[Elem, NewTo]

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    Creates a new builder by applying a transformation function to the results of this builder.

    Creates a new builder by applying a transformation function to the results of this builder.

    NewTo

    the type of collection returned by f.

    f

    the transformation function.

    returns

    a new builder which is the same as the current builder except that a transformation function is applied to this builder's result.

    Definition Classes
    Builder
  26. final def ne(arg0: AnyRef): Boolean

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    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

    true if the argument is not a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  27. final def notify(): Unit

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    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Note

    not specified by SLS as a member of AnyRef

  28. final def notifyAll(): Unit

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    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Note

    not specified by SLS as a member of AnyRef

  29. def resultWithTaskSupport: To

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    Constructs the result and sets the appropriate tasksupport object to the resulting collection if this is applicable.

  30. def sizeHint(coll: TraversableLike[_, _], delta: Int): Unit

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    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta.

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection is known to have a cheap size method. Currently this is assumed to be the case if and only if the collection is of type IndexedSeqLike. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    coll

    the collection which serves as a hint for the result's size.

    delta

    a correction to add to the coll.size to produce the size hint.

    Definition Classes
    Builder
  31. def sizeHint(coll: TraversableLike[_, _]): Unit

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    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta.

    Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection is known to have a cheap size method. Currently this is assumed to be the case if and only if the collection is of type IndexedSeqLike. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    coll

    the collection which serves as a hint for the result's size.

    Definition Classes
    Builder
  32. def sizeHint(size: Int): Unit

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    Gives a hint how many elements are expected to be added when the next result is called.

    Gives a hint how many elements are expected to be added when the next result is called. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    size

    the hint how many elements will be added.

    Definition Classes
    Builder
  33. def sizeHintBounded(size: Int, boundingColl: TraversableLike[_, _]): Unit

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    Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection.

    Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

    size

    the hint how many elements will be added.

    boundingColl

    the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.

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

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    Definition Classes
    AnyRef
  35. def toParArray: ParArray[T]

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    Implicit information
    This member is added by an implicit conversion from Combiner[Elem, To] to CollectionsHaveToParArray[Combiner[Elem, To], T] performed by method CollectionsHaveToParArray in scala.collection.parallel. This conversion will take place only if an implicit value of type (Combiner[Elem, To]) ⇒ GenTraversableOnce[T] is in scope.
    Definition Classes
    CollectionsHaveToParArray
  36. def toString(): String

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    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

    a String representation of the object.

    Definition Classes
    AnyRef → Any
  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 [B](y: B): (Combiner[Elem, To], B)

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

Inherited from Parallel

Inherited from Sizing

Inherited from Builder[Elem, To]

Inherited from Growable[Elem]

Inherited from Clearable

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion CollectionsHaveToParArray from Combiner[Elem, To] to CollectionsHaveToParArray[Combiner[Elem, To], T]

Inherited by implicit conversion any2stringadd from Combiner[Elem, To] to any2stringadd[Combiner[Elem, To]]

Inherited by implicit conversion StringFormat from Combiner[Elem, To] to StringFormat[Combiner[Elem, To]]

Inherited by implicit conversion Ensuring from Combiner[Elem, To] to Ensuring[Combiner[Elem, To]]

Inherited by implicit conversion ArrowAssoc from Combiner[Elem, To] to ArrowAssoc[Combiner[Elem, To]]

Ungrouped