/**
* Copyright (c) 2016-present, RxJava Contributors.
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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<T> extends
AbstractFlowableWithUpstream<T, T> {
public
FlowableOnBackpressureError(
Flowable<T>
source) {
super(
source);
}
@
Override
protected void
subscribeActual(
Subscriber<? super T>
s) {
this.
source.
subscribe(new
BackpressureErrorSubscriber<T>(
s));
}
static final class
BackpressureErrorSubscriber<T>
extends
AtomicLong implements
FlowableSubscriber<T>,
Subscription {
private static final long
serialVersionUID = -3176480756392482682L;
final
Subscriber<? super T>
downstream;
Subscription upstream;
boolean
done;
BackpressureErrorSubscriber(
Subscriber<? super T>
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();
}
}
}