net.liftweb.util

DynamicCell

case class DynamicCell [T] (f: () ⇒ T) extends Cell[T] with Product

A cell that changes value on each access. This kind of cell could be used to access an external resource. Warningthe function may be accessed many times during a single wiring recalculation, so it's best to use this as a front to a value that's memoized for some duration.

attributes: final
go to: companion
linear super types: Product, Equals, Cell[T], Dependent, AnyRef, Any
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  1. DynamicCell
  2. Product
  3. Equals
  4. Cell
  5. Dependent
  6. AnyRef
  7. Any
Visibility
  1. Public
  2. All
Impl.
  1. Concrete
  2. Abstract

Instance constructors

  1. new DynamicCell (f: () ⇒ T)

Value Members

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

    attributes: final
    definition classes: AnyRef
  2. def != (arg0: Any) : Boolean

    o != arg0 is the same as !(o == (arg0)).

    o != arg0 is the same as !(o == (arg0)).

    arg0

    the object to compare against this object for dis-equality.

    returns

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

    attributes: final
    definition classes: Any
  3. def ## () : Int

    attributes: final
    definition classes: AnyRef → Any
  4. def $asInstanceOf [T0] () : T0

    attributes: final
    definition classes: AnyRef
  5. def $isInstanceOf [T0] () : Boolean

    attributes: final
    definition classes: AnyRef
  6. def == (arg0: AnyRef) : Boolean

    o == arg0 is the same as if (o eq null) arg0 eq null else o.equals(arg0).

    o == arg0 is the same as if (o eq null) arg0 eq null else o.equals(arg0).

    arg0

    the object to compare against this object for equality.

    returns

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

    attributes: final
    definition classes: AnyRef
  7. def == (arg0: Any) : Boolean

    o == arg0 is the same as o.equals(arg0).

    o == arg0 is the same as o.equals(arg0).

    arg0

    the object to compare against this object for equality.

    returns

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

    attributes: final
    definition classes: Any
  8. def addDependent [T <: Dependent] (dep: T) : T

    Add a Dependent to this cell.

    Add a Dependent to this cell. The Dependent will be notified when the Cell's value changes. Dependents are kept around as WeakReferences so they do not have to be explicitly removed from the List

    definition classes: Cell
  9. def asInstanceOf [T0] : T0

    This method is used to cast the receiver object to be of type T0.

    This method is used to 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 expression1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expressionList(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 typed.

    returns

    the receiver object.

    attributes: final
    definition classes: Any
  10. def canEqual (arg0: Any) : Boolean

    definition classes: DynamicCell → Equals
  11. def clone () : AnyRef

    This method creates and returns a copy of the receiver object.

    This method creates and returns 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
    definition classes: AnyRef
  12. def currentValue : (T, Long)

    The cell's value and most recent change time

    The cell's value and most recent change time

    definition classes: DynamicCellCell
  13. def dependents : Seq[Dependent]

    Get a List of the Dependents

    Get a List of the Dependents

    definition classes: Cell
  14. def eq (arg0: AnyRef) : Boolean

    This method is used to test whether the argument (arg0) is a reference to the receiver object (this).

    This method is used to test whether the argument (arg0) is a reference to the receiver object (this).

    The eq method implements an [http://en.wikipedia.org/wiki/Equivalence_relation equivalence relation] on non-null instances of AnyRef: * It is reflexive: for any non-null instance x of type AnyRef, x.eq(x) returns true. * It is symmetric: for any non-null instances x and y of type AnyRef, x.eq(y) returns true if and only if y.eq(x) returns true. * It is transitive: for any non-null instances x, y, and z of type AnyRef if x.eq(y) returns true and y.eq(z) returns true, then x.eq(z) returns true.

    Additionally, the eq method has three other 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).

    arg0

    the object to compare against this object for reference equality.

    returns

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

    attributes: final
    definition classes: AnyRef
  15. def equals (arg0: Any) : Boolean

    This method is used to compare the receiver object (this) with the argument object (arg0) for equivalence.

    This method is used to compare the receiver object (this) with the argument object (arg0) for equivalence.

    The default implementations of this method is an [http://en.wikipedia.org/wiki/Equivalence_relation equivalence relation]: * It is reflexive: for any instance x of type Any, x.equals(x) should return true. * It is symmetric: for any instances x and y of type Any, x.equals(y) should return true if and only if y.equals(x) returns true. * It is transitive: for any instances x, y, and z of type AnyRef if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.

    If you override this method, you should verify that your implementation remains an equivalence relation. Additionally, when overriding this method it is often necessary to override hashCode to ensure that objects that are "equal" (o1.equals(o2) returns true) hash to the same scala.Int (o1.hashCode.equals(o2.hashCode)).

    arg0

    the object to compare against this object for equality.

    returns

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

    definition classes: DynamicCell → Equals → AnyRef → Any
  16. val f : () ⇒ T

  17. def finalize () : Unit

    This method is called by the garbage collector on the receiver object when garbage collection determines that there are no more references to the object.

    This method is called by the garbage collector on the receiver object when garbage collection determines that there are no more references to the object.

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

    attributes: protected
    definition classes: AnyRef
  18. def get : T

    Get the cell's value

    Get the cell's value

    definition classes: Cell
  19. def getClass () : java.lang.Class[_]

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

    Returns 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.

    attributes: final
    definition classes: AnyRef
  20. def hashCode () : Int

    Returns a hash code value for the object.

    Returns a hash code value for the object.

    The default hashing algorithm is platform dependent.

    Note that it is allowed for two objects to have identical hash codes (o1.hashCode.equals(o2.hashCode)) yet not be equal (o1.equals(o2) returns false). A degenerate implementation could always return 0. However, it is required that if two objects are equal (o1.equals(o2) returns true) that they have identical hash codes (o1.hashCode.equals(o2.hashCode)). Therefore, when overriding this method, be sure to verify that the behavior is consistent with the equals method.

    returns

    the hash code value for the object.

    definition classes: DynamicCell → AnyRef → Any
  21. def isInstanceOf [T0] : Boolean

    This method is used to test whether the dynamic type of the receiver object is T0.

    This method is used to test whether the dynamic type of the receiver object is T0.

    Note that the test result of the test is modulo Scala's erasure semantics. Therefore the expression1.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 requested typed.

    returns

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

    attributes: final
    definition classes: Any
  22. def lift [A, B] (cell: Cell[B])(f: (T, B) ⇒ A) : Cell[A]

    definition classes: Cell
  23. def lift [A] (f: (T) ⇒ A) : Cell[A]

    Create a new Cell by applying the function to this cell

    Create a new Cell by applying the function to this cell

    definition classes: Cell
  24. def ne (arg0: AnyRef) : Boolean

    o.ne(arg0) is the same as !(o.eq(arg0)).

    o.ne(arg0) is the same as !(o.eq(arg0)).

    arg0

    the object to compare against this object for reference dis-equality.

    returns

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

    attributes: final
    definition classes: AnyRef
  25. def notify () : Unit

    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.

    attributes: final
    definition classes: AnyRef
  26. def notifyAll () : Unit

    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.

    attributes: final
    definition classes: AnyRef
  27. def notifyDependents () : Unit

    Notify dependents of a state change.

    Notify dependents of a state change. Note this will be performed on a separate thread asynchronously

    definition classes: Cell
  28. def predicateChanged (which: net.liftweb.util.Cell[_]) : Unit

    If the predicate cell changes, the Dependent will be notified.

    If the predicate cell changes, the Dependent will be notified. This Cell has no predicates, so this is just Unit

    definition classes: DynamicCellDependent
  29. def productArity : Int

    definition classes: DynamicCell → Product
  30. def productElement (arg0: Int) : Any

    definition classes: DynamicCell → Product
  31. def productElements : Iterator[Any]

    definition classes: Product
      deprecated:
    1. use productIterator instead

  32. def productIterator : Iterator[Any]

    definition classes: Product
  33. def productPrefix : String

    definition classes: DynamicCell → Product
  34. def removeDependent [T <: Dependent] (dep: T) : T

    Remove a Dependent to this cell.

    Remove a Dependent to this cell.

    definition classes: Cell
  35. def synchronized [T0] (arg0: T0) : T0

    attributes: final
    definition classes: AnyRef
  36. def toString () : String

    Returns a string representation of the object.

    Returns a string representation of the object.

    The default representation is platform dependent.

    returns

    a string representation of the object.

    definition classes: DynamicCell → AnyRef → Any
  37. def unregisterFromAllDepenencies () : Unit

    Remove from all dependencies

    Remove from all dependencies

    attributes: protected
    definition classes: Dependent
  38. def wait () : Unit

    attributes: final
    definition classes: AnyRef
  39. def wait (arg0: Long, arg1: Int) : Unit

    attributes: final
    definition classes: AnyRef
  40. def wait (arg0: Long) : Unit

    attributes: final
    definition classes: AnyRef
  41. def whoDoIDependOn : Seq[net.liftweb.util.Cell[_]]

    Get a list of all the cells this Dependency depends on

    Get a list of all the cells this Dependency depends on

    attributes: protected
    definition classes: Dependent
  42. def youDependOnMe (who: net.liftweb.util.Cell[_]) : Unit

    The Cell notifies the Dependent of the dependency

    The Cell notifies the Dependent of the dependency

    definition classes: Dependent
  43. def youDontDependOnMe (who: net.liftweb.util.Cell[_]) : Unit

    The Cell notifies the Dependent of the removed dependency

    The Cell notifies the Dependent of the removed dependency

    definition classes: Dependent

Inherited from Product

Inherited from Equals

Inherited from Cell[T]

Inherited from Dependent

Inherited from AnyRef

Inherited from Any