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/*
* Copyright (c) 2016-2023 VMware Inc. or its affiliates, All Rights Reserved.
*
* 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
*
* https://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 reactor.core.publisher;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import org.reactivestreams.Publisher;
import reactor.core.CorePublisher;
import reactor.core.CoreSubscriber;
/**
* Repeatedly subscribes to the source sequence if it signals any error
* either indefinitely or a fixed number of times.
*
* The times == Long.MAX_VALUE is treated as infinite retry.
*
* @param the value type
* @see Reactive-Streams-Commons
*/
final class FluxRetry extends InternalFluxOperator {
final long times;
FluxRetry(Flux extends T> source, long times) {
super(source);
if (times < 0L) {
throw new IllegalArgumentException("times >= 0 required but it was " + times);
}
this.times = times;
}
@Override
public CoreSubscriber super T> subscribeOrReturn(CoreSubscriber super T> actual) {
RetrySubscriber parent = new RetrySubscriber<>(source, actual, times);
actual.onSubscribe(parent);
if (!parent.isCancelled()) {
parent.resubscribe();
}
return null;
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class RetrySubscriber
extends Operators.MultiSubscriptionSubscriber {
final CorePublisher extends T> source;
long remaining;
volatile int wip;
@SuppressWarnings("rawtypes")
static final AtomicIntegerFieldUpdater WIP =
AtomicIntegerFieldUpdater.newUpdater(RetrySubscriber.class, "wip");
long produced;
RetrySubscriber(CorePublisher extends T> source, CoreSubscriber super T> actual, long remaining) {
super(actual);
this.source = source;
this.remaining = remaining;
}
@Override
public void onNext(T t) {
produced++;
actual.onNext(t);
}
@Override
public void onError(Throwable t) {
long r = remaining;
if (r != Long.MAX_VALUE) {
if (r == 0) {
actual.onError(t);
return;
}
remaining = r - 1;
}
resubscribe();
}
void resubscribe() {
if (WIP.getAndIncrement(this) == 0) {
do {
if (isCancelled()) {
return;
}
long c = produced;
if (c != 0L) {
produced = 0L;
produced(c);
}
// Not wrapping source, but just the subscriber due to requirements
// in TailCallSubscribeTest#retry
source.subscribe(Operators.restoreContextOnSubscriberIfPublisherNonInternal(source, this));
} while (WIP.decrementAndGet(this) != 0);
}
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
}
}