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- `def transform[S](f: Try[T] => Try[S])(implicit executor: ExecutionContext): Future[S]`
- `def transformWith[S](f: Try[T] => Future[S])(implicit executor: ExecutionContext): Future[S]`
- `def flatten[S](implicit ev: T <:< Future[S]): Future[S]`
- `def zipWith[U, R](that: Future[U])(f: (T, U) => R)(implicit executor: ExecutionContext): Future[R]`
Add missing utilities:
- `val unit: Future[Unit]` in `object Future`
- `object never extends Future[Nothing]` in `object Future`
- `def defaultBlockContext: BlockContext` in `object BlockContext`
- `def toString: String` on stdlib implementations of `Future`
Refactors:
- the `scala.concurrent.Future` trait to not explicit create any `Promises`,
so that implementations can control implementation type,
this is mainly facilitated through adding of the `transform` and `transformWith` methods.
- the implementation of `ExecutionContextImpl` has been cleaned up
- the `scala.concurrent.impl.DefaultPromise` has been reimplemented to not use `sun.misc.Unsafe`
Securing:
- Add a self-check in `completeWith` and `tryCompleteWith` to avoid cycles in trait Promise
- Capping the maximum number of threads for the global `ExecutionContext` to the max parallelism
- Implementing (almost) all `Future` combinators on `transformWith` and `transform` means
that `DefaultPromise` linking works on both `(flat)map` and `recover(With)`
- Nested `blocking {}` should not spawn extra threads beyond the first.
Removes:
- the private `internalExecutor` method in favor of an import in trait `Future`
- the private `internalExecutor` method in favor of an import in trait `Promise`
- the `AtomicReferenceFieldUpdater` in `AbstractPromise` since we're using `Unsafe`
- `scala.concurrent.impl.Future` is no longer needed
Deprecates:
- `Future.onSuccess` - discourage the use of callbacks
(and is also redundant considering `foreach` and `onComplete`)
- `Future.onFailure` - discourage the use of callbacks
(and is also redundant considering `onComplete` and `failed.foreach`)
- `ExecutionContext.prepare` - it was ill specced and it is too easy to forget to call it
(or even know when to call it or call it more times than needed)
- All classes in scala.concurrent.forkjoin. Scala 2.12 will be Java 8+ and as such the jsr166e
should be used as included in java.util.concurrent.
Reimplements:
- `failed` - in terms of `transform`
- `map` - in terms of `transform`
- `flatMap` - in terms of `transformWith`
- `recover` - in terms of `transform`
- `recoverWith` - in terms of `transformWith`
- `zip` - in terms of `flatMap` + `map`
- `fallbackTo` - in terms of `recoverWith` + `recoverWith`
- `andThen` - in terms of `transform`
Miscellaneous:
- Giving the threads of `ExecutionContext.global` sensible names
- Optimizes `object Future.successful` and `object Future.failed` are now separate implementations,
to optimize for the result, avoiding doing work for the "other branch".
- Optimizes `compressedRoot()` by avoiding double-calls to volatile get.
Documentation:
- Almost all methods on `Future` and `Promise` have been revisited and had their ScalaDoc updated
Tests:
- Yes
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Collections library tidying, part one: scripting.
Everything in scala.collection.scripting is deprecated now, along with the
<< method that is implemented in a few other classes. Scripting does not
seem used at all, and anyone who did can easily write a wrapper that does
the same thing.
Deprecated *Proxy collections.
The only place proxies were used in the library was in swing.ListView, and
that was easy to change to a lazy val.
Proxy itself is used in ScalaNumberProxy and such, so it was left
undeprecated.
Deprecated Synchronized* traits from collections.
Synchronizability does not compose well, and it requires careful examination
of every method (which has not actually been done).
Places where the Scala codebase needs to be fixed (eventually) include:
scala.reflect.internal.util.Statistics$QuantMap
scala.tools.nsc.interactive.Global (several places)
Deprecated LinkedList (including Double- and -Like variants).
Interface is idiosyncratic and dangerously low-level. Although some
low-level functionality of this sort would be useful, this doesn't seem
to be the ideal implementation.
Also deprecated the extractFirst method in Queue as it exposes LinkedList.
Cannot shift internal representations away from LinkedList at this time
because of that method.
Deprecated non-finality of several toX collection methods.
Improved documentation of most toX collection methods to describe what the
expectation is for their behavior. Additionally deprecated overriding of
- toIterator in IterableLike (should always forward to iterator)
- toTraversable in TraversableLike (should always return self)
- toIndexedSeq in immutable.IndexedSeq (should always return self)
- toMap in immutable.Map (should always return self)
- toSet in immutable.Set (should always return self)
Did not do anything with IterableLike.toIterable or Seq/SeqLike.toSeq since
for some odd reason immutable.Range overrides those.
Deprecated Forwarders from collections.
Forwarding, without an automatic mechanism to keep up to date with changes
in the forwarded class, is inherently unreliable. Absent a mechanism to
keep current, they're deprecated. ListBuffer is the only class in the
collections library that uses forwarders, and that functionality can be
rolled into ListBuffer itself.
Deprecating immutable set/map adaptors.
They're a bad idea (barring compiler support) for the same reason that all
the other adaptors are a bad idea: they get out of date and probably have a
variety of performance bugs.
Deprecated inheritance from leaf classes in immutable collections.
Inheriting from leaf-classes in immutable collections is rarely a good idea
since whenever you use any interesting collections method you'll revert to
the original class. Also, the methods are often designed to work with only
particular behavior, and an override would be difficult (at best) to make
work. Fortunately, people seem to have realized this and there are few to
no cases of people extending PagedSeq and TreeSet and the like.
Note that in many cases the classes will become sealed not final.
Deprecated overriding of methods and inheritance from various mutable
collections.
Some mutable collections seem unsuited for overriding since to override
anything interesting you would need vast knowledge of internal data
structures and/or access to private methods. These include
- ArrayBuilder.ofX classes.
- ArrayOps
- Some methods of BitSet (moved others from private to protected final)
- Some methods of HashTable and FlatHashTable
- Some methods of HashMap and HashSet (esp += and -= which just forward)
- Some methods of other maps and sets (LinkedHashX, ListMap, TreeSet)
- PriorityQueue
- UnrolledBuffer
This is a somewhat aggressive deprecation, the theory being better to try it
out now and back off if it's too much than not attempt the change and be
stuck with collections that can neither be safely inherited nor have
implementation details changed.
Note that I have made no changes--in this commit--which would cause
deprecation warnings in any of the Scala projects available on Maven (at
least as gathered by Adriaan). There are deprecation warnings induced
within the library (esp. for classes/traits that should become static) and
the compiler. I have not attempted to fix all the deprecations in the
compiler as some of them touch the IDE API (but these mostly involved
Synchronized which is inherently unsafe, so this should be fixed
eventually in coordination with the IDE code base(s)).
Updated test checks to include new deprecations.
Used a higher level implementation for messages in JavapClass.
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