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2.x: dedicated reduce() op implementations (#4885)
* 2.x: dedicated reduce() op implementations * Fix unnecessary duplicate assignment, remove trailing spaces * Check for more terminal state
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126 changes: 126 additions & 0 deletions
126
src/main/java/io/reactivex/internal/operators/flowable/FlowableReduceSeedSingle.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| /** | ||
| * Copyright 2016 Netflix, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in | ||
| * compliance with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software distributed under the License is | ||
| * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See | ||
| * the License for the specific language governing permissions and limitations under the License. | ||
| */ | ||
|
|
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| package io.reactivex.internal.operators.flowable; | ||
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| import org.reactivestreams.*; | ||
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| import io.reactivex.*; | ||
| import io.reactivex.disposables.Disposable; | ||
| import io.reactivex.exceptions.Exceptions; | ||
| import io.reactivex.functions.BiFunction; | ||
| import io.reactivex.internal.functions.ObjectHelper; | ||
| import io.reactivex.internal.subscriptions.SubscriptionHelper; | ||
| import io.reactivex.plugins.RxJavaPlugins; | ||
|
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| /** | ||
| * Reduce a sequence of values, starting from a seed value and by using | ||
| * an accumulator function and return the last accumulated value. | ||
| * | ||
| * @param <T> the source value type | ||
| * @param <R> the accumulated result type | ||
| */ | ||
| public final class FlowableReduceSeedSingle<T, R> extends Single<R> { | ||
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| final Publisher<T> source; | ||
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| final R seed; | ||
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| final BiFunction<R, ? super T, R> reducer; | ||
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| public FlowableReduceSeedSingle(Publisher<T> source, R seed, BiFunction<R, ? super T, R> reducer) { | ||
| this.source = source; | ||
| this.seed = seed; | ||
| this.reducer = reducer; | ||
| } | ||
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| @Override | ||
| protected void subscribeActual(SingleObserver<? super R> observer) { | ||
| source.subscribe(new ReduceSeedObserver<T, R>(observer, reducer, seed)); | ||
| } | ||
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| static final class ReduceSeedObserver<T, R> implements Subscriber<T>, Disposable { | ||
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| final SingleObserver<? super R> actual; | ||
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| final BiFunction<R, ? super T, R> reducer; | ||
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| R value; | ||
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| Subscription s; | ||
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| public ReduceSeedObserver(SingleObserver<? super R> actual, BiFunction<R, ? super T, R> reducer, R value) { | ||
| this.actual = actual; | ||
| this.value = value; | ||
| this.reducer = reducer; | ||
| } | ||
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| @Override | ||
| public void onSubscribe(Subscription s) { | ||
| if (SubscriptionHelper.validate(this.s, s)) { | ||
| this.s = s; | ||
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| actual.onSubscribe(this); | ||
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| s.request(Long.MAX_VALUE); | ||
| } | ||
| } | ||
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| @Override | ||
| public void onNext(T value) { | ||
| R v = this.value; | ||
| if (v != null) { | ||
| try { | ||
| this.value = ObjectHelper.requireNonNull(reducer.apply(v, value), "The reducer returned a null value"); | ||
| } catch (Throwable ex) { | ||
| Exceptions.throwIfFatal(ex); | ||
| s.cancel(); | ||
| onError(ex); | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public void onError(Throwable e) { | ||
| R v = value; | ||
| value = null; | ||
| if (v != null) { | ||
| s = SubscriptionHelper.CANCELLED; | ||
| actual.onError(e); | ||
| } else { | ||
| RxJavaPlugins.onError(e); | ||
| } | ||
| } | ||
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| @Override | ||
| public void onComplete() { | ||
| R v = value; | ||
| value = null; | ||
| if (v != null) { | ||
| s = SubscriptionHelper.CANCELLED; | ||
| actual.onSuccess(v); | ||
| } | ||
| } | ||
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| @Override | ||
| public void dispose() { | ||
| s.cancel(); | ||
| s = SubscriptionHelper.CANCELLED; | ||
| } | ||
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| @Override | ||
| public boolean isDisposed() { | ||
| return s == SubscriptionHelper.CANCELLED; | ||
| } | ||
| } | ||
| } |
61 changes: 61 additions & 0 deletions
61
src/main/java/io/reactivex/internal/operators/flowable/FlowableReduceWithSingle.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /** | ||
| * Copyright 2016 Netflix, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in | ||
| * compliance with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software distributed under the License is | ||
| * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See | ||
| * the License for the specific language governing permissions and limitations under the License. | ||
| */ | ||
|
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| package io.reactivex.internal.operators.flowable; | ||
|
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| import java.util.concurrent.Callable; | ||
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| import org.reactivestreams.Publisher; | ||
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| import io.reactivex.*; | ||
| import io.reactivex.exceptions.Exceptions; | ||
| import io.reactivex.functions.BiFunction; | ||
| import io.reactivex.internal.disposables.EmptyDisposable; | ||
| import io.reactivex.internal.functions.ObjectHelper; | ||
| import io.reactivex.internal.operators.flowable.FlowableReduceSeedSingle.ReduceSeedObserver; | ||
|
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| /** | ||
| * Reduce a sequence of values, starting from a generated seed value and by using | ||
| * an accumulator function and return the last accumulated value. | ||
| * | ||
| * @param <T> the source value type | ||
| * @param <R> the accumulated result type | ||
| */ | ||
| public final class FlowableReduceWithSingle<T, R> extends Single<R> { | ||
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| final Publisher<T> source; | ||
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| final Callable<R> seedSupplier; | ||
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| final BiFunction<R, ? super T, R> reducer; | ||
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| public FlowableReduceWithSingle(Publisher<T> source, Callable<R> seedSupplier, BiFunction<R, ? super T, R> reducer) { | ||
| this.source = source; | ||
| this.seedSupplier = seedSupplier; | ||
| this.reducer = reducer; | ||
| } | ||
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| @Override | ||
| protected void subscribeActual(SingleObserver<? super R> observer) { | ||
| R seed; | ||
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| try { | ||
| seed = ObjectHelper.requireNonNull(seedSupplier.call(), "The seedSupplier returned a null value"); | ||
| } catch (Throwable ex) { | ||
| Exceptions.throwIfFatal(ex); | ||
| EmptyDisposable.error(ex, observer); | ||
| return; | ||
| } | ||
| source.subscribe(new ReduceSeedObserver<T, R>(observer, reducer, seed)); | ||
| } | ||
| } |
127 changes: 127 additions & 0 deletions
127
src/main/java/io/reactivex/internal/operators/observable/ObservableReduceMaybe.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| /** | ||
| * Copyright 2016 Netflix, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in | ||
| * compliance with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software distributed under the License is | ||
| * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See | ||
| * the License for the specific language governing permissions and limitations under the License. | ||
| */ | ||
|
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| package io.reactivex.internal.operators.observable; | ||
|
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| import io.reactivex.*; | ||
| import io.reactivex.disposables.Disposable; | ||
| import io.reactivex.exceptions.Exceptions; | ||
| import io.reactivex.functions.BiFunction; | ||
| import io.reactivex.internal.disposables.DisposableHelper; | ||
| import io.reactivex.internal.functions.ObjectHelper; | ||
| import io.reactivex.plugins.RxJavaPlugins; | ||
|
|
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| /** | ||
| * Reduce a sequence of values into a single value via an aggregator function and emit the final value or complete | ||
| * if the source is empty. | ||
| * | ||
| * @param <T> the source and result value type | ||
| */ | ||
| public final class ObservableReduceMaybe<T> extends Maybe<T> { | ||
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| final ObservableSource<T> source; | ||
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| final BiFunction<T, T, T> reducer; | ||
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| public ObservableReduceMaybe(ObservableSource<T> source, BiFunction<T, T, T> reducer) { | ||
| this.source = source; | ||
| this.reducer = reducer; | ||
| } | ||
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| @Override | ||
| protected void subscribeActual(MaybeObserver<? super T> observer) { | ||
| source.subscribe(new ReduceObserver<T>(observer, reducer)); | ||
| } | ||
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| static final class ReduceObserver<T> implements Observer<T>, Disposable { | ||
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| final MaybeObserver<? super T> actual; | ||
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| final BiFunction<T, T, T> reducer; | ||
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| boolean done; | ||
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| T value; | ||
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| Disposable d; | ||
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| public ReduceObserver(MaybeObserver<? super T> observer, BiFunction<T, T, T> reducer) { | ||
| this.actual = observer; | ||
| this.reducer = reducer; | ||
| } | ||
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| @Override | ||
| public void onSubscribe(Disposable d) { | ||
| if (DisposableHelper.validate(this.d, d)) { | ||
| this.d = d; | ||
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| actual.onSubscribe(this); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void onNext(T value) { | ||
| if (!done) { | ||
| T v = this.value; | ||
|
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| if (v == null) { | ||
| this.value = value; | ||
| } else { | ||
| try { | ||
| this.value = ObjectHelper.requireNonNull(reducer.apply(v, value), "The reducer returned a null value"); | ||
| } catch (Throwable ex) { | ||
| Exceptions.throwIfFatal(ex); | ||
| d.dispose(); | ||
| onError(ex); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public void onError(Throwable e) { | ||
| if (done) { | ||
| RxJavaPlugins.onError(e); | ||
| return; | ||
| } | ||
| done = true; | ||
| value = null; | ||
| actual.onError(e); | ||
| } | ||
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| @Override | ||
| public void onComplete() { | ||
| if (done) { | ||
| return; | ||
| } | ||
| done = true; | ||
| T v = value; | ||
| value = null; | ||
| if (v != null) { | ||
| actual.onSuccess(v); | ||
| } else { | ||
| actual.onComplete(); | ||
| } | ||
| } | ||
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| @Override | ||
| public void dispose() { | ||
| d.dispose(); | ||
| } | ||
|
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| @Override | ||
| public boolean isDisposed() { | ||
| return d.isDisposed(); | ||
| } | ||
| } | ||
| } |
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