/
FlowableCharSequence.java
149 lines (117 loc) · 3.67 KB
/
FlowableCharSequence.java
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/*
* Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package benchmarks.flow.scrabble.optimizations;
import io.reactivex.Flowable;
import io.reactivex.internal.fuseable.QueueFuseable;
import io.reactivex.internal.subscriptions.BasicQueueSubscription;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
import io.reactivex.internal.util.BackpressureHelper;
import org.reactivestreams.Subscriber;
final class FlowableCharSequence extends Flowable<Integer> {
final CharSequence string;
FlowableCharSequence(CharSequence string) {
this.string = string;
}
@Override
public void subscribeActual(Subscriber<? super Integer> s) {
s.onSubscribe(new CharSequenceSubscription(s, string));
}
static final class CharSequenceSubscription
extends BasicQueueSubscription<Integer> {
private static final long serialVersionUID = -4593793201463047197L;
final Subscriber<? super Integer> downstream;
final CharSequence string;
final int end;
int index;
volatile boolean cancelled;
CharSequenceSubscription(Subscriber<? super Integer> downstream, CharSequence string) {
this.downstream = downstream;
this.string = string;
this.end = string.length();
}
@Override
public void cancel() {
cancelled = true;
}
@Override
public void request(long n) {
if (SubscriptionHelper.validate(n)) {
if (BackpressureHelper.add(this, n) == 0) {
if (n == Long.MAX_VALUE) {
fastPath();
} else {
slowPath(n);
}
}
}
}
void fastPath() {
int e = end;
CharSequence s = string;
Subscriber<? super Integer> a = downstream;
for (int i = index; i != e; i++) {
if (cancelled) {
return;
}
a.onNext((int)s.charAt(i));
}
if (!cancelled) {
a.onComplete();
}
}
void slowPath(long r) {
long e = 0L;
int i = index;
int f = end;
CharSequence s = string;
Subscriber<? super Integer> a = downstream;
for (;;) {
while (e != r && i != f) {
if (cancelled) {
return;
}
a.onNext((int)s.charAt(i));
i++;
e++;
}
if (i == f) {
if (!cancelled) {
a.onComplete();
}
return;
}
r = get();
if (e == r) {
index = i;
r = addAndGet(-e);
if (r == 0L) {
break;
}
e = 0L;
}
}
}
@Override
public int requestFusion(int requestedMode) {
return requestedMode & QueueFuseable.SYNC;
}
@Override
public Integer poll() {
int i = index;
if (i != end) {
index = i + 1;
return (int)string.charAt(i);
}
return null;
}
@Override
public boolean isEmpty() {
return index == end;
}
@Override
public void clear() {
index = end;
}
}
}