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Reactive Extensions for Java
/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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 io.reactivex.internal.operators.flowable;
import java.util.concurrent.atomic.*;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.exceptions.MissingBackpressureException;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
import io.reactivex.internal.util.BackpressureHelper;
import io.reactivex.subscribers.SerializedSubscriber;
public final class FlowableSamplePublisher extends Flowable {
final Publisher source;
final Publisher> other;
final boolean emitLast;
public FlowableSamplePublisher(Publisher source, Publisher> other, boolean emitLast) {
this.source = source;
this.other = other;
this.emitLast = emitLast;
}
@Override
protected void subscribeActual(Subscriber super T> s) {
SerializedSubscriber serial = new SerializedSubscriber(s);
if (emitLast) {
source.subscribe(new SampleMainEmitLast(serial, other));
} else {
source.subscribe(new SampleMainNoLast(serial, other));
}
}
abstract static class SamplePublisherSubscriber extends AtomicReference implements FlowableSubscriber, Subscription {
private static final long serialVersionUID = -3517602651313910099L;
final Subscriber super T> downstream;
final Publisher> sampler;
final AtomicLong requested = new AtomicLong();
final AtomicReference other = new AtomicReference();
Subscription upstream;
SamplePublisherSubscriber(Subscriber super T> actual, Publisher> other) {
this.downstream = actual;
this.sampler = other;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
if (other.get() == null) {
sampler.subscribe(new SamplerSubscriber(this));
s.request(Long.MAX_VALUE);
}
}
}
@Override
public void onNext(T t) {
lazySet(t);
}
@Override
public void onError(Throwable t) {
SubscriptionHelper.cancel(other);
downstream.onError(t);
}
@Override
public void onComplete() {
SubscriptionHelper.cancel(other);
completeMain();
}
void setOther(Subscription o) {
SubscriptionHelper.setOnce(other, o, Long.MAX_VALUE);
}
@Override
public void request(long n) {
if (SubscriptionHelper.validate(n)) {
BackpressureHelper.add(requested, n);
}
}
@Override
public void cancel() {
SubscriptionHelper.cancel(other);
upstream.cancel();
}
public void error(Throwable e) {
upstream.cancel();
downstream.onError(e);
}
public void complete() {
upstream.cancel();
completeOther();
}
void emit() {
T value = getAndSet(null);
if (value != null) {
long r = requested.get();
if (r != 0L) {
downstream.onNext(value);
BackpressureHelper.produced(requested, 1);
} else {
cancel();
downstream.onError(new MissingBackpressureException("Couldn't emit value due to lack of requests!"));
}
}
}
abstract void completeMain();
abstract void completeOther();
abstract void run();
}
static final class SamplerSubscriber implements FlowableSubscriber
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