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2.x: Add Observable.rangeLong & Flowable.rangeLong (#4687)
* 2.x: Add Observable.rangeLong & Flowable.rangeLong * Clean up cast * Adjust Long overflow checks * Add test for rangeLong count 1 * Fix ObservableRangeLongTest.testRangeWithOverflow5
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src/main/java/io/reactivex/internal/operators/flowable/FlowableRangeLong.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,246 @@ | ||
| /** | ||
| * 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 io.reactivex.Flowable; | ||
| import io.reactivex.internal.fuseable.ConditionalSubscriber; | ||
| import io.reactivex.internal.subscriptions.BasicQueueSubscription; | ||
| import io.reactivex.internal.subscriptions.SubscriptionHelper; | ||
| import io.reactivex.internal.util.BackpressureHelper; | ||
| import org.reactivestreams.Subscriber; | ||
|
|
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| /** | ||
| * Emits a range of long values. | ||
| */ | ||
| public final class FlowableRangeLong extends Flowable<Long> { | ||
| final long start; | ||
| final long end; | ||
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| public FlowableRangeLong(long start, long count) { | ||
| this.start = start; | ||
| this.end = start + count; | ||
| } | ||
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| @Override | ||
| public void subscribeActual(Subscriber<? super Long> s) { | ||
| if (s instanceof ConditionalSubscriber) { | ||
| s.onSubscribe(new RangeConditionalSubscription( | ||
| (ConditionalSubscriber<? super Long>)s, start, end)); | ||
| } else { | ||
| s.onSubscribe(new RangeSubscription(s, start, end)); | ||
| } | ||
| } | ||
|
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| abstract static class BaseRangeSubscription extends BasicQueueSubscription<Long> { | ||
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| private static final long serialVersionUID = -2252972430506210021L; | ||
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| final long end; | ||
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| long index; | ||
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| volatile boolean cancelled; | ||
|
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| BaseRangeSubscription(long index, long end) { | ||
| this.index = index; | ||
| this.end = end; | ||
| } | ||
|
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| @Override | ||
| public final int requestFusion(int mode) { | ||
| return mode & SYNC; | ||
| } | ||
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| @Override | ||
| public final Long poll() { | ||
| long i = index; | ||
| if (i == end) { | ||
| return null; | ||
| } | ||
| index = i + 1; | ||
| return i; | ||
| } | ||
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| @Override | ||
| public final boolean isEmpty() { | ||
| return index == end; | ||
| } | ||
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| @Override | ||
| public final void clear() { | ||
| index = end; | ||
| } | ||
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| @Override | ||
| public final void request(long n) { | ||
| if (SubscriptionHelper.validate(n)) { | ||
| if (BackpressureHelper.add(this, n) == 0L) { | ||
| if (n == Long.MAX_VALUE) { | ||
| fastPath(); | ||
| } else { | ||
| slowPath(n); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public final void cancel() { | ||
| cancelled = true; | ||
| } | ||
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| abstract void fastPath(); | ||
|
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| abstract void slowPath(long r); | ||
| } | ||
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| static final class RangeSubscription extends BaseRangeSubscription { | ||
|
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| private static final long serialVersionUID = 2587302975077663557L; | ||
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| final Subscriber<? super Long> actual; | ||
|
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| RangeSubscription(Subscriber<? super Long> actual, long index, long end) { | ||
| super(index, end); | ||
| this.actual = actual; | ||
| } | ||
|
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| @Override | ||
| void fastPath() { | ||
| long f = end; | ||
| Subscriber<? super Long> a = actual; | ||
|
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| for (long i = index; i != f; i++) { | ||
| if (cancelled) { | ||
| return; | ||
| } | ||
| a.onNext(i); | ||
| } | ||
| if (cancelled) { | ||
| return; | ||
| } | ||
| a.onComplete(); | ||
| } | ||
|
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| @Override | ||
| void slowPath(long r) { | ||
| long e = 0; | ||
| long f = end; | ||
| long i = index; | ||
| Subscriber<? super Long> a = actual; | ||
|
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| for (;;) { | ||
|
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| while (e != r && i != f) { | ||
| if (cancelled) { | ||
| return; | ||
| } | ||
|
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| a.onNext(i); | ||
|
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| e++; | ||
| i++; | ||
| } | ||
|
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| if (i == f) { | ||
| if (!cancelled) { | ||
| a.onComplete(); | ||
| } | ||
| return; | ||
| } | ||
|
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| r = get(); | ||
| if (e == r) { | ||
| index = i; | ||
| r = addAndGet(-e); | ||
| if (r == 0L) { | ||
| return; | ||
| } | ||
| e = 0L; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| static final class RangeConditionalSubscription extends BaseRangeSubscription { | ||
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| private static final long serialVersionUID = 2587302975077663557L; | ||
|
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| final ConditionalSubscriber<? super Long> actual; | ||
|
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| RangeConditionalSubscription(ConditionalSubscriber<? super Long> actual, long index, long end) { | ||
| super(index, end); | ||
| this.actual = actual; | ||
| } | ||
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| @Override | ||
| void fastPath() { | ||
| long f = end; | ||
| ConditionalSubscriber<? super Long> a = actual; | ||
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| for (long i = index; i != f; i++) { | ||
| if (cancelled) { | ||
| return; | ||
| } | ||
| a.tryOnNext(i); | ||
| } | ||
| if (cancelled) { | ||
| return; | ||
| } | ||
| a.onComplete(); | ||
| } | ||
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| @Override | ||
| void slowPath(long r) { | ||
| long e = 0; | ||
| long f = end; | ||
| long i = index; | ||
| ConditionalSubscriber<? super Long> a = actual; | ||
|
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| for (;;) { | ||
|
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| while (e != r && i != f) { | ||
| if (cancelled) { | ||
| return; | ||
| } | ||
|
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| if (a.tryOnNext(i)) { | ||
| e++; | ||
| } | ||
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| i++; | ||
| } | ||
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| if (i == f) { | ||
| if (!cancelled) { | ||
| a.onComplete(); | ||
| } | ||
| return; | ||
| } | ||
|
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| r = get(); | ||
| if (e == r) { | ||
| index = i; | ||
| r = addAndGet(-e); | ||
| if (r == 0) { | ||
| return; | ||
| } | ||
| e = 0; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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