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rxjava2-extensions developed by David Karnok
/*
* Copyright 2016-2017 David Karnok
*
* 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.
*/
package hu.akarnokd.rxjava2.operators;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
import io.reactivex.internal.util.BackpressureHelper;
/**
* Emits only every Nth item.
*
* @param the value type
*
* @since 0.14.2
*/
final class FlowableEvery extends Flowable implements FlowableTransformer {
final Publisher source;
final long keep;
FlowableEvery(Publisher source, long keep) {
this.source = source;
this.keep = keep;
}
@Override
protected void subscribeActual(Subscriber super T> s) {
source.subscribe(new EverySubscriber(s, keep));
}
@Override
public Publisher apply(Flowable upstream) {
return new FlowableEvery(upstream, keep);
}
static final class EverySubscriber implements Subscriber, Subscription {
final Subscriber super T> actual;
final long keep;
long index;
Subscription s;
EverySubscriber(Subscriber super T> actual, long keep) {
this.actual = actual;
this.keep = keep;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
long i = index + 1;
if (i == keep) {
index = 0;
actual.onNext(t);
} else {
index = i;
}
}
@Override
public void onError(Throwable t) {
actual.onError(t);
}
@Override
public void onComplete() {
actual.onComplete();
}
@Override
public void request(long n) {
if (SubscriptionHelper.validate(n)) {
long u = BackpressureHelper.multiplyCap(n, keep);
s.request(u);
}
}
@Override
public void cancel() {
s.cancel();
}
}
}