3.x: Remove fromFuture(..., Scheduler) overloads (#6814)

Author: akarnokd

src/main/java/io/reactivex/rxjava3/core/Flowable.java

@@ -2089,95 +2089,6 @@ public static <T> Flowable<T> error(@NonNull Throwable throwable) {
         return RxJavaPlugins.onAssembly(new FlowableFromFuture<>(future, timeout, unit));
     }
 
-    /**
-     * Converts a {@link Future} into a {@link Publisher}, with a timeout on the {@code Future}.
-     * <p>
-     * <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/from.Future.png" alt="">
-     * <p>
-     * You can convert any object that supports the {@code Future} interface into a {@code Publisher} that emits the
-     * return value of the {@link Future#get} method of that object by passing the object into the {@code from}
-     * method.
-     * <p>
-     * Unlike 1.x, canceling the {@code Flowable} won't cancel the future. If necessary, one can use composition to achieve the
-     * cancellation effect: {@code futurePublisher.doOnCancel(() -> future.cancel(true));}.
-     * <p>
-     * <em>Important note:</em> This {@code Publisher} is blocking; you cannot cancel it.
-     * <p>
-     * Also note that this operator will consume a {@link CompletionStage}-based {@code Future} subclass (such as
-     * {@link CompletableFuture}) in a blocking manner as well. Use the {@link #fromCompletionStage(CompletionStage)}
-     * operator to convert and consume such sources in a non-blocking fashion instead.
-     * <dl>
-     *  <dt><b>Backpressure:</b></dt>
-     *  <dd>The operator honors backpressure from downstream.</dd>
-     *  <dt><b>Scheduler:</b></dt>
-     *  <dd>{@code fromFuture} does not operate by default on a particular {@link Scheduler}.</dd>
-     * </dl>
-     *
-     * @param future
-     *            the source {@code Future}
-     * @param timeout
-     *            the maximum time to wait before calling {@code get}
-     * @param unit
-     *            the {@link TimeUnit} of the {@code timeout} argument
-     * @param scheduler
-     *            the {@code Scheduler} to wait for the {@code Future} on. Use a {@code Scheduler} such as
-     *            {@link Schedulers#io()} that can block and wait on the {@code Future}
-     * @param <T>
-     *            the type of object that the {@code Future} returns, and also the type of item to be emitted by
-     *            the resulting {@code Publisher}
-     * @return a {@code Flowable} that emits the item from the source {@code Future}
-     * @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
-     * @see #fromCompletionStage(CompletionStage)
-     */
-    @SuppressWarnings({ "unchecked" })
-    @CheckReturnValue
-    @NonNull
-    @BackpressureSupport(BackpressureKind.FULL)
-    @SchedulerSupport(SchedulerSupport.CUSTOM)
-    public static <@NonNull T> Flowable<T> fromFuture(Future<? extends T> future, long timeout, @NonNull TimeUnit unit, @NonNull Scheduler scheduler) {
-        Objects.requireNonNull(scheduler, "scheduler is null");
-        return fromFuture((Future<T>)future, timeout, unit).subscribeOn(scheduler);
-    }
-
-    /**
-     * Converts a {@link Future}, operating on a specified {@link Scheduler}, into a {@link Publisher}.
-     * <p>
-     * <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/from.Future.s.png" alt="">
-     * <p>
-     * You can convert any object that supports the {@code Future} interface into a {@code Publisher} that emits the
-     * return value of the {@link Future#get} method of that object by passing the object into the {@code from}
-     * method.
-     * <p>
-     * Unlike 1.x, canceling the {@code Flowable} won't cancel the future. If necessary, one can use composition to achieve the
-     * cancellation effect: {@code futurePublisher.doOnCancel(() -> future.cancel(true));}.
-     * <dl>
-     *  <dt><b>Backpressure:</b></dt>
-     *  <dd>The operator honors backpressure from downstream.</dd>
-     *  <dt><b>Scheduler:</b></dt>
-     *  <dd>You specify which {@code Scheduler} this operator will use.</dd>
-     * </dl>
-     *
-     * @param future
-     *            the source {@code Future}
-     * @param scheduler
-     *            the {@code Scheduler} to wait for the {@code Future} on. Use a {@code Scheduler} such as
-     *            {@link Schedulers#io()} that can block and wait on the {@code Future}
-     * @param <T>
-     *            the type of object that the {@code Future} returns, and also the type of item to be emitted by
-     *            the resulting {@code Publisher}
-     * @return a {@code Flowable} that emits the item from the source {@code Future}
-     * @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
-     */
-    @SuppressWarnings({ "unchecked" })
-    @CheckReturnValue
-    @NonNull
-    @BackpressureSupport(BackpressureKind.FULL)
-    @SchedulerSupport(SchedulerSupport.CUSTOM)
-    public static <@NonNull T> Flowable<T> fromFuture(Future<? extends T> future, @NonNull Scheduler scheduler) {
-        Objects.requireNonNull(scheduler, "scheduler is null");
-        return fromFuture((Future<T>)future).subscribeOn(scheduler);
-    }
-
     /**
      * Converts an {@link Iterable} sequence into a {@link Publisher} that emits the items in the sequence.
      * <p>

src/main/java/io/reactivex/rxjava3/core/Observable.java

@@ -1839,84 +1839,6 @@ public static <T> Observable<T> fromFuture(@NonNull Future<? extends T> future,
         return RxJavaPlugins.onAssembly(new ObservableFromFuture<>(future, timeout, unit));
     }
 
-    /**
-     * Converts a {@link Future} into an ObservableSource, with a timeout on the Future.
-     * <p>
-     * <img width="640" height="287" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/fromFuture.timeout.scheduler.png" alt="">
-     * <p>
-     * You can convert any object that supports the {@link Future} interface into an ObservableSource that emits the
-     * return value of the {@link Future#get} method of that object, by passing the object into the {@code from}
-     * method.
-     * <p>
-     * Unlike 1.x, disposing the Observable won't cancel the future. If necessary, one can use composition to achieve the
-     * cancellation effect: {@code futureObservableSource.doOnDispose(() -> future.cancel(true));}.
-     * <p>
-     * <em>Important note:</em> This ObservableSource is blocking; you cannot dispose it.
-     * <dl>
-     *  <dt><b>Scheduler:</b></dt>
-     *  <dd>{@code fromFuture} does not operate by default on a particular {@link Scheduler}.</dd>
-     * </dl>
-     *
-     * @param future
-     *            the source {@link Future}
-     * @param timeout
-     *            the maximum time to wait before calling {@code get}
-     * @param unit
-     *            the {@link TimeUnit} of the {@code timeout} argument
-     * @param scheduler
-     *            the {@link Scheduler} to wait for the Future on. Use a Scheduler such as
-     *            {@link Schedulers#io()} that can block and wait on the Future
-     * @param <T>
-     *            the type of object that the {@link Future} returns, and also the type of item to be emitted by
-     *            the resulting ObservableSource
-     * @return an Observable that emits the item from the source {@link Future}
-     * @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
-     */
-    @CheckReturnValue
-    @NonNull
-    @SchedulerSupport(SchedulerSupport.CUSTOM)
-    public static <T> Observable<T> fromFuture(@NonNull Future<? extends T> future, long timeout, @NonNull TimeUnit unit, @NonNull Scheduler scheduler) {
-        Objects.requireNonNull(scheduler, "scheduler is null");
-        Observable<T> o = fromFuture(future, timeout, unit);
-        return o.subscribeOn(scheduler);
-    }
-
-    /**
-     * Converts a {@link Future}, operating on a specified {@link Scheduler}, into an ObservableSource.
-     * <p>
-     * <img width="640" height="294" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/fromFuture.scheduler.png" alt="">
-     * <p>
-     * You can convert any object that supports the {@link Future} interface into an ObservableSource that emits the
-     * return value of the {@link Future#get} method of that object, by passing the object into the {@code from}
-     * method.
-     * <p>
-     * Unlike 1.x, disposing the Observable won't cancel the future. If necessary, one can use composition to achieve the
-     * cancellation effect: {@code futureObservableSource.doOnDispose(() -> future.cancel(true));}.
-     * <dl>
-     *  <dt><b>Scheduler:</b></dt>
-     *  <dd>You specify which {@link Scheduler} this operator will use.</dd>
-     * </dl>
-     *
-     * @param future
-     *            the source {@link Future}
-     * @param scheduler
-     *            the {@link Scheduler} to wait for the Future on. Use a Scheduler such as
-     *            {@link Schedulers#io()} that can block and wait on the Future
-     * @param <T>
-     *            the type of object that the {@link Future} returns, and also the type of item to be emitted by
-     *            the resulting ObservableSource
-     * @return an Observable that emits the item from the source {@link Future}
-     * @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
-     */
-    @CheckReturnValue
-    @NonNull
-    @SchedulerSupport(SchedulerSupport.CUSTOM)
-    public static <T> Observable<T> fromFuture(@NonNull Future<? extends T> future, @NonNull Scheduler scheduler) {
-        Objects.requireNonNull(scheduler, "scheduler is null");
-        Observable<T> o = fromFuture(future);
-        return o.subscribeOn(scheduler);
-    }
-
     /**
      * Converts an {@link Iterable} sequence into an ObservableSource that emits the items in the sequence.
      * <p>

src/main/java/io/reactivex/rxjava3/core/Single.java

@@ -722,73 +722,6 @@ public static <T> Single<T> error(@NonNull Throwable exception) {
         return toSingle(Flowable.fromFuture(future, timeout, unit));
     }
 
-    /**
-     * Converts a {@link Future} into a {@code Single}, with a timeout on the {@code Future}.
-     * <p>
-     * <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.from.Future.png" alt="">
-     * <p>
-     * You can convert any object that supports the {@code Future} interface into a {@code Single} that emits
-     * the return value of the {@link Future#get} method of that object, by passing the object into the
-     * {@code from} method.
-     * <p>
-     * <em>Important note:</em> This {@code Single} is blocking; you cannot dispose it.
-     * <dl>
-     * <dt><b>Scheduler:</b></dt>
-     * <dd>You specify the {@link Scheduler} where the blocking wait will happen.</dd>
-     * </dl>
-     *
-     * @param future
-     *            the source {@code Future}
-     * @param timeout
-     *            the maximum time to wait before calling {@code get}
-     * @param unit
-     *            the {@link TimeUnit} of the {@code timeout} argument
-     * @param scheduler
-     *            the {@code Scheduler} to use for the blocking wait
-     * @param <T>
-     *            the type of object that the {@code Future} returns, and also the type of item to be emitted by
-     *            the resulting {@code Single}
-     * @return the new {@code Single} that emits the item from the source {@code Future}
-     * @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
-     */
-    @CheckReturnValue
-    @SchedulerSupport(SchedulerSupport.CUSTOM)
-    @NonNull
-    public static <@NonNull T> Single<T> fromFuture(@NonNull Future<? extends T> future, long timeout, @NonNull TimeUnit unit, @NonNull Scheduler scheduler) {
-        return toSingle(Flowable.fromFuture(future, timeout, unit, scheduler));
-    }
-
-    /**
-     * Converts a {@link Future}, operating on a specified {@link Scheduler}, into a {@code Single}.
-     * <p>
-     * <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.from.Future.s.png" alt="">
-     * <p>
-     * You can convert any object that supports the {@code Future} interface into a {@code Single} that emits
-     * the return value of the {@link Future#get} method of that object, by passing the object into the
-     * {@code from} method.
-     * <dl>
-     * <dt><b>Scheduler:</b></dt>
-     * <dd>You specify which {@code Scheduler} this operator will use.</dd>
-     * </dl>
-     *
-     * @param future
-     *            the source {@code Future}
-     * @param scheduler
-     *            the {@code Scheduler} to wait for the {@code Future} on. Use a {@code Scheduler} such as
-     *            {@link Schedulers#io()} that can block and wait on the {@code Future}
-     * @param <T>
-     *            the type of object that the {@code Future} returns, and also the type of item to be emitted by
-     *            the resulting {@code Single}
-     * @return the new {@code Single} that emits the item from the source {@code Future}
-     * @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
-     */
-    @CheckReturnValue
-    @SchedulerSupport(SchedulerSupport.CUSTOM)
-    @NonNull
-    public static <@NonNull T> Single<T> fromFuture(@NonNull Future<? extends T> future, @NonNull Scheduler scheduler) {
-        return toSingle(Flowable.fromFuture(future, scheduler));
-    }
-
     /**
      * Wraps a specific {@link Publisher} into a {@code Single} and signals its single element or error.
      * <p>

src/test/java/io/reactivex/rxjava3/flowable/FlowableNullTests.java

@@ -252,23 +252,13 @@ public void fromFutureTimedUnitNull() {
         Flowable.fromFuture(new FutureTask<>(Functions.EMPTY_RUNNABLE, null), 1, null);
     }
 
-    @Test(expected = NullPointerException.class)
-    public void fromFutureTimedSchedulerNull() {
-        Flowable.fromFuture(new FutureTask<>(Functions.EMPTY_RUNNABLE, null), 1, TimeUnit.SECONDS, null);
-    }
-
     @Test(expected = NullPointerException.class)
     public void fromFutureTimedReturnsNull() {
       FutureTask<Object> f = new FutureTask<>(Functions.EMPTY_RUNNABLE, null);
         f.run();
         Flowable.fromFuture(f, 1, TimeUnit.SECONDS).blockingLast();
     }
 
-    @Test(expected = NullPointerException.class)
-    public void fromFutureSchedulerNull() {
-        Flowable.fromFuture(new FutureTask<>(Functions.EMPTY_RUNNABLE, null), null);
-    }
-
     @Test(expected = NullPointerException.class)
     public void fromIterableNull() {
         Flowable.fromIterable(null);

src/test/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableToFutureTest.java

@@ -62,7 +62,7 @@ public void successOperatesOnSuppliedScheduler() throws Exception {
         TestScheduler scheduler = new TestScheduler();
         TestSubscriber<Object> ts = new TestSubscriber<>(subscriber);
 
-        Flowable.fromFuture(future, scheduler).subscribe(ts);
+        Flowable.fromFuture(future).subscribeOn(scheduler).subscribe(ts);
 
         verify(subscriber, never()).onNext(value);
 
@@ -234,7 +234,7 @@ public void run() {
 
         TestSubscriber<Integer> ts = TestSubscriber.create();
 
-        Flowable.fromFuture(task, Schedulers.computation()).subscribe(ts);
+        Flowable.fromFuture(task).subscribeOn(Schedulers.computation()).subscribe(ts);
 
         task.run();
 

src/test/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFromTest.java

@@ -30,7 +30,8 @@ public class ObservableFromTest extends RxJavaTest {
     @Test
     public void fromFutureTimeout() throws Exception {
         Observable.fromFuture(Observable.never()
-        .toFuture(), 100, TimeUnit.MILLISECONDS, Schedulers.io())
+        .toFuture(), 100, TimeUnit.MILLISECONDS)
+        .subscribeOn(Schedulers.io())
         .test()
         .awaitDone(5, TimeUnit.SECONDS)
         .assertFailure(TimeoutException.class);

src/test/java/io/reactivex/rxjava3/internal/operators/observable/ObservableToFutureTest.java

@@ -61,7 +61,7 @@ public void successOperatesOnSuppliedScheduler() throws Exception {
         TestScheduler scheduler = new TestScheduler();
         TestObserver<Object> to = new TestObserver<>(o);
 
-        Observable.fromFuture(future, scheduler).subscribe(to);
+        Observable.fromFuture(future).subscribeOn(scheduler).subscribe(to);
 
         verify(o, never()).onNext(value);
 

src/test/java/io/reactivex/rxjava3/internal/operators/single/SingleFromTest.java

@@ -24,15 +24,17 @@ public class SingleFromTest extends RxJavaTest {
 
     @Test
     public void fromFuture() throws Exception {
-        Single.fromFuture(Flowable.just(1).toFuture(), Schedulers.io())
+        Single.fromFuture(Flowable.just(1).toFuture())
+        .subscribeOn(Schedulers.io())
         .test()
         .awaitDone(5, TimeUnit.SECONDS)
         .assertResult(1);
     }
 
     @Test
     public void fromFutureTimeout() throws Exception {
-        Single.fromFuture(Flowable.never().toFuture(), 1, TimeUnit.SECONDS, Schedulers.io())
+        Single.fromFuture(Flowable.never().toFuture(), 1, TimeUnit.SECONDS)
+        .subscribeOn(Schedulers.io())
         .test()
         .awaitDone(5, TimeUnit.SECONDS)
         .assertFailure(TimeoutException.class);

src/test/java/io/reactivex/rxjava3/observable/ObservableNullTests.java

@@ -299,24 +299,13 @@ public void fromFutureTimedUnitNull() {
         Observable.fromFuture(new FutureTask<>(Functions.EMPTY_RUNNABLE, null), 1, null);
     }
 
-    @Test(expected = NullPointerException.class)
-    public void fromFutureTimedSchedulerNull() {
-        Observable.fromFuture(new FutureTask<>(Functions.EMPTY_RUNNABLE, null), 1, TimeUnit.SECONDS, null);
-    }
-
     @Test(expected = NullPointerException.class)
     public void fromFutureTimedReturnsNull() {
         FutureTask<Object> f = new FutureTask<>(Functions.EMPTY_RUNNABLE, null);
         f.run();
         Observable.fromFuture(f, 1, TimeUnit.SECONDS).blockingLast();
     }
 
-    @Test(expected = NullPointerException.class)
-    public void fromFutureSchedulerNull() {
-        FutureTask<Object> f = new FutureTask<>(Functions.EMPTY_RUNNABLE, null);
-        Observable.fromFuture(f, null);
-    }
-
     @Test(expected = NullPointerException.class)
     public void fromIterableNull() {
         Observable.fromIterable(null);

src/test/java/io/reactivex/rxjava3/single/SingleNullTests.java

@@ -194,33 +194,13 @@ public Object call() throws Exception {
         }), 1, null);
     }
 
-    @Test(expected = NullPointerException.class)
-    public void fromFutureTimedSchedulerNull() {
-        Single.fromFuture(new FutureTask<>(new Callable<Object>() {
-            @Override
-            public Object call() throws Exception {
-                return null;
-            }
-        }), 1, TimeUnit.SECONDS, null);
-    }
-
     @Test(expected = NullPointerException.class)
     public void fromFutureTimedReturnsNull() {
         FutureTask<Object> f = new FutureTask<>(Functions.EMPTY_RUNNABLE, null);
         f.run();
         Single.fromFuture(f, 1, TimeUnit.SECONDS).blockingGet();
     }
 
-    @Test(expected = NullPointerException.class)
-    public void fromFutureSchedulerNull() {
-        Single.fromFuture(new FutureTask<>(new Callable<Object>() {
-            @Override
-            public Object call() throws Exception {
-                return null;
-            }
-        }), null);
-    }
-
     @Test(expected = NullPointerException.class)
     public void fromPublisherNull() {
         Single.fromPublisher(null);