org.scalatest.events

Ordinal

class Ordinal extends Ordered[Ordinal]

Class used to specify a sequential order for events reported during a test run, so they can be arranged in that order in a report even if the events were fired in some other order during concurrent or distributed execution.

An Ordinal is an immutable object holding a run stamp and a sequence of stamps. The run stamp is an integer that identifies a particular run. All events reported during the same run should share the same run stamp. By contrast, each event reported during a particular run should have a different stamps sequence. One use case for the run stamp is that the initial run from ScalaTest's GUI will have run stamp 0. Subsequent reruns will have run stamps 1, 2, 3, etc., so that reports in the GUI can simply be sorted in "ordinal" order. Another use case is a set of servers used to run multiple tests simultaneously in a distributed fashion. The run stamp can be used to identify the run for which an event belongs.

The stamps sequence is designed to allow a sequential order of events to be specified during concurrent execution of ScalaTest suites. ScalaTest's model for concurrent execution is that the suites that make up a run may be executed concurrently, but the tests within a single suite will be executed sequentially. In addition to tests, suites may contain nested suites. The default implementation of execute in class Suite will first invoke runNestedSuites and then runTests. If no Distributor is passed to execute, therunNestedSuites method will execute the nested suites sequentially via the same thread that invoked runNestedSuites. As a result, suites will by default executed in depth first order when executed sequentially. If a Distributor is passed to execute, therunNestedSuites method will simply put its nested suites into the Distributorand return. Some other threads or processes must then execute those nested suites. Given the default implementations of execute and runNestedSuites described here, the Ordinalwill allow the events from a concurrent run to be sorted in the same depth-first order that the events from a corresponding sequential run would arrive.

Each event reported during a run should be given a unique Ordinal. An Ordinal is required by all Event subclasses, instances of which are used to send information to the reportfunction passed to a Suite's execute method. The first Ordinal for a run can be produced be passing a run stamp to Ordinal's lone public constructor:

val firstOrdinal = new Ordinal(99)

The run stamp can be any integer. The Ordinal created in this way can be passed along with the first reported event of the run, such as a RunStarting event. Thereafter, new Ordinals for the same run can be obtained by calling either next or nextNewOldPair on the previously obtained Ordinal. In other words, given an Ordinal, you can obtain the next Ordinal by invoking one of these two "next" methods on the Ordinal you have in hand. Before executing a new Suite, the nextNewOldPairmethod should be invoked. This will return two new Ordinals, one for the new Suite about to be executed, and one for the currently executing entity (either a Suite or some sort of test runner). At any other time, the next Ordinalcan be obtained by simply invoking next on the current Ordinal.

You can convert an Ordinal to a List by invoking toList on it. The resulting List will contain the run stamp as its first element, and the contents of its stamps sequence as the subsequent elements. The stamps sequence will initially be composed of a single element with the value 0. Thus, toList invoked on the firstOrdinal shown above will result in:

firstOrdinal.toList // results in: List(99, 0)

Each time next is invoked, the rightmost integer returned by toList will increment:

val secondOrdinal = firstOrdinal.next
secondOrdinal.toList // results in: List(99, 1)
val thirdOrdinal = secondOrdinal.next
thirdOrdinal.toList  // result is : List(99, 2)

When nextNewOldPair is invoked the result will be a tuple whose first element is the first Ordinal for the new Suite about to be executed (for example, a nested Suite of the currently executing Suite). The second element is the next Ordinal for the currently executing Suite or other entity:

val (nextForNewSuite, nextForThisRunner) = thirdOrdinal.nextNewOldPair
nextForNewSuite.toList   // results in: (99, 2, 0)
nextForThisRunner.toList // results in: (99, 3)

The toList method of the Ordinal for the new suite starts with the same sequence of elements as the Ordinal from which it was created, but has one more element, a 0, appended at the end. Subsequent invocations of next on this series of Ordinals will increment that last element:

val newSuiteOrdinal2 = nextForNewSuite.next
newSuiteOrdinal2.toList // results in: List(99, 2, 1)
val newSuiteOrdinal3 = newSuiteOrdinal2.next
newSuiteOrdinal3.toList  // result is : List(99, 2, 2)

This behavior allows events fired by Suite running concurrently to be reordered in a pre-determined sequence after all the events have been reported. The ordering of two Ordinals can be determined by first comparing the first element of the Lists obtained by invoking toList on both Ordinals. These values represent the runStamp. If one run stamp is a lower number than the other, that Ordinal comes first. For example, an Ordinal with a run stamp of 98 is ordered before an Ordinal with a run stamp of 99. If the run stamps are equal, the next number in the list is inspected. As with the run stamps, an Ordinal with a lower number is ordered before an Ordinal with a higher number. If two corresponding elements are equal, the next pair of elements will be inspected. This will continue no down the length of the Lists until a position is found where the element values are not equal, or the end of one or both of the Lists are reached. If the two Lists are identical all the way to the end, and both Lists have the same lengths, then the Ordinals are equal. (Equal Ordinals will not happen if correctly used by creating a new Ordinal for each fired event and each new Suite.). If the two Lists are identical all the way to the end of one, but the other Listis longer (has more elements), then the shorter list is ordered before the longer one.

As an example, here are some Ordinal List forms in order:

List(99, 0)
List(99, 1)
List(99, 2)
List(99, 2, 0)
List(99, 2, 1)
List(99, 2, 2)
List(99, 2, 2, 0)
List(99, 2, 2, 1)
List(99, 2, 2, 2)
List(99, 2, 3)
List(99, 2, 4)
List(99, 2, 4, 0)
List(99, 2, 4, 1)
List(99, 2, 4, 2)
List(99, 3)
List(99, 4)
List(99, 4, 0)
List(99, 4, 1)
List(99, 5)

attributes: final
linear super types: Ordered[Ordinal], Comparable[Ordinal], AnyRef, Any
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Instance constructors

  1. new Ordinal (runStamp: Int)

    Construct a the first Ordinal for a run.

    Construct a the first Ordinal for a run.

    runStamp

    a number that identifies a particular run

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 < (that: Ordinal) : Boolean

    definition classes: Ordered

  7. def <= (that: Ordinal) : Boolean

    definition classes: Ordered

  8. 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

  9. 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

  10. def > (that: Ordinal) : Boolean

    definition classes: Ordered

  11. def >= (that: Ordinal) : Boolean

    definition classes: Ordered

  12. 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

  13. 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

  14. def compare (that: Ordinal) : Int

    Compares this Ordinal with the passed Ordinal for order.

    Compares this Ordinal with the passed Ordinal for order. If this object is "less than" (ordered before) the passed object, compare will return a negative integer. If this class is "greater than" (ordered after) the passed object, compare will return a positive integer. Otherwise, this Ordinal is equal to the passed object, and compare will return 0.

    returns

    a negative integer, 0, or positive integer indicating this Ordinal is less than, equal to, or greater than the passed Ordinal.

    definition classes: Ordinal → Ordered

  15. def compareTo (that: Ordinal) : Int

    definition classes: Ordered → Comparable

  16. 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

  17. def equals (other: Any) : Boolean

    Indicates whether the passed object is equal to this one.

    Indicates whether the passed object is equal to this one.

    returns

    true if the passed object is equal to this one

    definition classes: Ordinal → AnyRef → Any

  18. 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

  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 this object.

    Returns a hash code value for this object.

    returns

    a hash code for this object

    definition classes: Ordinal → 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 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

  23. def next : Ordinal

    Construct the next Ordinal for the current suite or other entity, such as a runner.

    Construct the next Ordinal for the current suite or other entity, such as a runner.

  24. def nextNewOldPair : (Ordinal, Ordinal)

    Construct two new Ordinals, one for a new Suite about to be executed and one for the current Suite or other entity, such as a runner. The Ordinalfor the new Suite is the first (_1) element in the tuple:

    Construct two new Ordinals, one for a new Suite about to be executed and one for the current Suite or other entity, such as a runner. The Ordinalfor the new Suite is the first (_1) element in the tuple:

    val (nextOrdinalForNewSuite, nextOrdinalForThisSuite) currentOrdinal.nextNewOldPair

    The reason the next Ordinal for the new Suite is first is because it will be ordered before the next Ordinal for the current Suite (or other entity such as a runner). In fact, any event reported within the context of the new Suite or its nested Suites will be ordered before the next Ordinal for the current Suite.

    returns

    a tuple whose first element is the first Ordinal for the new Suite and whose second element is the next Ordinal for the current Suite or other entity, such as a runner.

  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. val runStamp : Int

  28. def synchronized [T0] (arg0: T0) : T0

    attributes: final
    definition classes: AnyRef

  29. def toList : List[Int]

    Returns a List[Int] representation of this Ordinal. A set of Ordinals will be ordered in the same order as the set of List[Int]s that are returned by invoking this method on each of the Ordinals.

    Returns a List[Int] representation of this Ordinal. A set of Ordinals will be ordered in the same order as the set of List[Int]s that are returned by invoking this method on each of the Ordinals. The first element of the returned List[Int] is the runStamp.

    returns

    a List[Int] representation of this Ordinal.

  30. 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: AnyRef → Any

  31. def wait () : Unit

    attributes: final
    definition classes: AnyRef

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

    attributes: final
    definition classes: AnyRef

  33. def wait (arg0: Long) : Unit

    attributes: final
    definition classes: AnyRef

Inherited from Ordered[Ordinal]

Inherited from Comparable[Ordinal]

Inherited from AnyRef

Inherited from Any