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/**
 * 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.AtomicLong; 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.plugins.RxJavaPlugins; public final class FlowableOnBackpressureError extends AbstractFlowableWithUpstream { public FlowableOnBackpressureError(Flowable source) { super(source); } @Override protected void subscribeActual(Subscriber s) { this.source.subscribe(new BackpressureErrorSubscriber(s)); } static final class BackpressureErrorSubscriber extends AtomicLong implements FlowableSubscriber, Subscription { private static final long serialVersionUID = -3176480756392482682L; final Subscriber downstream; Subscription upstream; boolean done; BackpressureErrorSubscriber(Subscriber downstream) { this.downstream = downstream; } @Override public void onSubscribe(Subscription s) { if (SubscriptionHelper.validate(this.upstream, s)) { this.upstream = s; downstream.onSubscribe(this); s.request(Long.MAX_VALUE); } } @Override public void onNext(T t) { if (done) { return; } long r = get(); if (r != 0L) { downstream.onNext(t); BackpressureHelper.produced(this, 1); } else { onError(new MissingBackpressureException("could not emit value due to lack of requests")); } } @Override public void onError(Throwable t) { if (done) { RxJavaPlugins.onError(t); return; } done = true; downstream.onError(t); } @Override public void onComplete() { if (done) { return; } done = true; downstream.onComplete(); } @Override public void request(long n) { if (SubscriptionHelper.validate(n)) { BackpressureHelper.add(this, n); } } @Override public void cancel() { upstream.cancel(); } } }





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