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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.AtomicInteger;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.exceptions.*;
import io.reactivex.functions.Predicate;
import io.reactivex.internal.subscriptions.SubscriptionArbiter;
public final class FlowableRetryPredicate extends AbstractFlowableWithUpstream {
final Predicate predicate;
final long count;
public FlowableRetryPredicate(Flowable source,
long count,
Predicate predicate) {
super(source);
this.predicate = predicate;
this.count = count;
}
@Override
public void subscribeActual(Subscriber s) {
SubscriptionArbiter sa = new SubscriptionArbiter(false);
s.onSubscribe(sa);
RetrySubscriber rs = new RetrySubscriber(s, count, predicate, sa, source);
rs.subscribeNext();
}
static final class RetrySubscriber extends AtomicInteger implements FlowableSubscriber {
private static final long serialVersionUID = -7098360935104053232L;
final Subscriber downstream;
final SubscriptionArbiter sa;
final Publisher source;
final Predicate predicate;
long remaining;
long produced;
RetrySubscriber(Subscriber actual, long count,
Predicate predicate, SubscriptionArbiter sa, Publisher source) {
this.downstream = actual;
this.sa = sa;
this.source = source;
this.predicate = predicate;
this.remaining = count;
}
@Override
public void onSubscribe(Subscription s) {
sa.setSubscription(s);
}
@Override
public void onNext(T t) {
produced++;
downstream.onNext(t);
}
@Override
public void onError(Throwable t) {
long r = remaining;
if (r != Long.MAX_VALUE) {
remaining = r - 1;
}
if (r == 0) {
downstream.onError(t);
} else {
boolean b;
try {
b = predicate.test(t);
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
downstream.onError(new CompositeException(t, e));
return;
}
if (!b) {
downstream.onError(t);
return;
}
subscribeNext();
}
}
@Override
public void onComplete() {
downstream.onComplete();
}
/**
* Subscribes to the source again via trampolining.
*/
void subscribeNext() {
if (getAndIncrement() == 0) {
int missed = 1;
for (;;) {
if (sa.isCancelled()) {
return;
}
long p = produced;
if (p != 0L) {
produced = 0L;
sa.produced(p);
}
source.subscribe(this);
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
}
}
}