object FunctionalParallelismSection extends AnyFlatSpec with Matchers with Section
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The following set of sections represent the exercises contained in the book "Functional Programming in Scala", written by Paul Chiusano and Rúnar Bjarnason and published by Manning.
Functional programming in Scala
The following set of sections represent the exercises contained in the book "Functional Programming in Scala", written by Paul Chiusano and Rúnar Bjarnason and published by Manning. This content library is meant to be used in tandem with the book. We use the same numeration for the exercises for you to follow them.
For more information about "Functional Programming in Scala" please visit its official website.
A data type for parallel computations
Exercise 7.1:
Par.map2
is a new higher-order function for combining the result of two parallel computations. Its signature is as follows:def map2[A,B,C](a: Par[A], b: Par[B])(f: (A,B) => C): Par[C]
Refining the API
Exercise 7.3:
Let's fix the implementation of
map2
so that it respects the contract of timeouts onFuture
:def map2[A,B,C](a: Par[A], b: Par[B])(f: (A,B) => C): Par[C] = es => { val (af, bf) = (a(es), b(es)) Map2Future(af, bf, f) }
Exercise 7.4:
Let's create some operations! Using
lazyUnit
, let's write a function to convert any functionA => B
to one that evaluates its result asynchronously: - def parChoiceMapAssert(res0: Int): Unit
Exercise 7.12:
Exercise 7.12:
Instead of a list of computations, let's use a
Map
of them: - def parChoiceNAssert(res0: Int): Unit
Exercise 7.9
The algebra of an API
Exercise 7.9
For a thread pool of size 2,
fork(fork(fork(x)))
will deadlock, and so on. Another, perhaps more interesting example isfork(map2(fork(x), fork(y)))
. In this case, the outer task is submitted first and occupies a thread waiting for bothfork(x)
andfork(y)
. Thefork(x)
andfork(y)
tasks are submitted and run in parallel, except that only one thread is available, resulting in deadlock.Refining combinators to their most general form
Exercise 7.11
Let’s implement
choiceN
, that will allow us to choose between an arbitrary list of parallel computations based on the result of a given first:def choiceN[A](n: Par[Int])(choices: List[Par[A]]): Par[A] = es => { val ind = run(es)(n).get run(es)(choices(ind)) }
Let's try to implement
choice
via the more generalchoiceN
: - def parChoiceNViaFlatMapAssert(res0: String): Unit
We can also re-implement
choiceN
in terms offlatMap
: - def parChoiceViaFlatMapAssert(res0: String): Unit
This new primitive
chooser
is usually calledbind
orflatMap
.This new primitive
chooser
is usually calledbind
orflatMap
. Let's use it to re-implementchoice
: - def parChooserAssert(res0: String): Unit
Exercise 7.13:
Exercise 7.13:
Let’s make a more general function that unifies them all:
- def parFilterAssert(res0: List[Int]): Unit
Exercise 7.5:
Exercise 7.5:
Remember,
asyncF
converts anA => B
to anA => Par[B]
by forking a parallel computation to produce the result. So we can fork off our N parallel computations pretty easily, but we need some way of collecting their results. Are we stuck? Well, just from inspecting the types, we can see that we need some way of converting ourList[Par[B]]
to thePar[List[B]]
required by the return type ofparMap
.Let's try to write the function
sequence
that will allow us convert aList[Par[B]]
into aPar[List[B]]
:def sequence_simple[A](l: List[Par[A]]): Par[List[A]] = l.foldRight[Par[List[A]]](unit(List()))((h,t) => map2(h,t)(_ :: _))
Exercise 7.6:
We can also implement
parFilter
, a function that filters elements of a list in parallel:def parFilter[A](l: List[A])(f: A => Boolean): Par[List[A]] = { val pars: List[Par[List[A]]] = l map asyncF((a: A) => if (f(a)) List(a) else List()) map(sequence(pars))(_.flatten) }
- def parFlatMapJoinAssert(res0: String): Unit
Exercise 7.14:
Exercise 7.14:
join
is a simpler combinator, for converting a Par[Par[X]] to Par[X] for any choice of X:def join[A](a: Par[Par[A]]): Par[A] = es => run(es)(run(es)(a).get())
We can implement
flatMap
usingjoin
, and vice-versa:def flatMapViaJoin[A,B](p: Par[A])(f: A => Par[B]): Par[B] = join(map(p)(f)) def joinViaFlatMap[A](a: Par[Par[A]]): Par[A] = flatMap(a)(x => x)
Let's try this last combinator:
- def pending: Assertion with PendingStatement
- Definition Classes
- Assertions
- def pendingUntilFixed(f: => Unit)(implicit pos: Position): Assertion with PendingStatement
- Definition Classes
- Assertions
- val readable: ReadableWord
- Definition Classes
- MatcherWords
- val regex: RegexWord
- Definition Classes
- Matchers
- final def registerIgnoredTest(testText: String, testTags: Tag*)(testFun: => Any)(implicit pos: Position): Unit
- Definition Classes
- AnyFlatSpecLike → TestRegistration
- final def registerTest(testText: String, testTags: Tag*)(testFun: => Any)(implicit pos: Position): Unit
- Definition Classes
- AnyFlatSpecLike → TestRegistration
- def rerunner: Option[String]
- Definition Classes
- Suite
- def run(testName: Option[String], args: Args): Status
- Definition Classes
- AnyFlatSpecLike → Suite
- def runNestedSuites(args: Args): Status
- Attributes
- protected
- Definition Classes
- Suite
- def runTest(testName: String, args: Args): Status
- Attributes
- protected
- Definition Classes
- AnyFlatSpecLike → TestSuite → Suite
- def runTests(testName: Option[String], args: Args): Status
- Attributes
- protected
- Definition Classes
- AnyFlatSpecLike → Suite
- implicit val shorthandSharedTestRegistrationFunction: StringVerbBehaveLikeInvocation
- Attributes
- protected
- Definition Classes
- AnyFlatSpecLike
- implicit val shorthandTestRegistrationFunction: StringVerbStringInvocation
- Attributes
- protected
- Definition Classes
- AnyFlatSpecLike
- val size: SizeWord
- Definition Classes
- MatcherWords
- val sorted: SortedWord
- Definition Classes
- MatcherWords
- val startWith: StartWithWord
- Definition Classes
- MatcherWords
- final val succeed: Assertion
- Definition Classes
- Assertions
- def suiteId: String
- Definition Classes
- Suite
- def suiteName: String
- Definition Classes
- Suite
- final def synchronized[T0](arg0: => T0): T0
- Definition Classes
- AnyRef
- def tags: Map[String, Set[String]]
- Definition Classes
- AnyFlatSpecLike → Suite
- def testDataFor(testName: String, theConfigMap: ConfigMap): TestData
- Definition Classes
- AnyFlatSpecLike → Suite
- def testNames: Set[String]
- Definition Classes
- AnyFlatSpecLike → Suite
- def the[T](implicit arg0: ClassTag[T], pos: Position): ResultOfTheTypeInvocation[T]
- Definition Classes
- Matchers
- def theSameElementsAs(xs: GenTraversable[_]): ResultOfTheSameElementsAsApplication
- Definition Classes
- Matchers
- def theSameElementsInOrderAs(xs: GenTraversable[_]): ResultOfTheSameElementsInOrderAsApplication
- Definition Classes
- Matchers
- val theSameInstanceAs: TheSameInstanceAsPhrase
- Definition Classes
- Matchers
- val they: TheyWord
- Attributes
- protected
- Definition Classes
- AnyFlatSpecLike
- def thrownBy(fun: => Any): ResultOfThrownByApplication
- Definition Classes
- Matchers
- def toString(): String
- Definition Classes
- AnyFlatSpec → AnyRef → Any
- val typeCheck: TypeCheckWord
- Definition Classes
- MatcherWords
- def typeCheckedConstraint[A, B](implicit equivalenceOfA: Equivalence[A], ev: <:<[B, A]): CanEqual[A, B]
- Definition Classes
- TripleEquals → TripleEqualsSupport
- implicit def unconstrainedEquality[A, B](implicit equalityOfA: Equality[A]): CanEqual[A, B]
- Definition Classes
- TripleEquals → TripleEqualsSupport
- val value: ValueWord
- Definition Classes
- Matchers
- final def wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException]) @native()
- def withClue[T](clue: Any)(fun: => T): T
- Definition Classes
- Assertions
- def withFixture(test: NoArgTest): Outcome
- Attributes
- protected
- Definition Classes
- TestSuite
- val writable: WritableWord
- Definition Classes
- MatcherWords
Deprecated Value Members
- def conversionCheckedConstraint[A, B](implicit equivalenceOfA: Equivalence[A], cnv: (B) => A): CanEqual[A, B]
- Definition Classes
- TripleEquals → TripleEqualsSupport
- Annotations
- @deprecated
- Deprecated
(Since version 3.1.0) The conversionCheckedConstraint method has been deprecated and will be removed in a future version of ScalaTest. It is no longer needed now that the deprecation period of ConversionCheckedTripleEquals has expired. It will not be replaced.
- def convertEquivalenceToAToBConversionConstraint[A, B](equivalenceOfB: Equivalence[B])(implicit ev: (A) => B): CanEqual[A, B]
- Definition Classes
- TripleEquals → TripleEqualsSupport
- Annotations
- @deprecated
- Deprecated
(Since version 3.1.0) The convertEquivalenceToAToBConversionConstraint method has been deprecated and will be removed in a future version of ScalaTest. It is no longer needed now that the deprecation period of ConversionCheckedTripleEquals has expired. It will not be replaced.
- def convertEquivalenceToBToAConversionConstraint[A, B](equivalenceOfA: Equivalence[A])(implicit ev: (B) => A): CanEqual[A, B]
- Definition Classes
- TripleEquals → TripleEqualsSupport
- Annotations
- @deprecated
- Deprecated
(Since version 3.1.0) The convertEquivalenceToBToAConversionConstraint method has been deprecated and will be removed in a future version of ScalaTest. It is no longer needed now that the deprecation period of ConversionCheckedTripleEquals has expired. It will not be replaced.
- def lowPriorityConversionCheckedConstraint[A, B](implicit equivalenceOfB: Equivalence[B], cnv: (A) => B): CanEqual[A, B]
- Definition Classes
- TripleEquals → TripleEqualsSupport
- Annotations
- @deprecated
- Deprecated
(Since version 3.1.0) The lowPriorityConversionCheckedConstraint method has been deprecated and will be removed in a future version of ScalaTest. It is no longer needed now that the deprecation period of ConversionCheckedTripleEquals has expired. It will not be replaced.
- final val styleName: String
- Definition Classes
- AnyFlatSpecLike → Suite
- Annotations
- @deprecated
- Deprecated
(Since version 3.1.0) The styleName lifecycle method has been deprecated and will be removed in a future version of ScalaTest with no replacement.