/*
* Copyright (c) 2019-Present Pivotal Software Inc, 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 reactor.core.CorePublisher;
import reactor.core.CoreSubscriber;
import reactor.core.Scannable;
import reactor.util.annotation.Nullable;
abstract class InternalConnectableFluxOperator<I, O> extends ConnectableFlux<O> implements Scannable,
OptimizableOperator<O, I> {
final ConnectableFlux<I> source;
@Nullable
final OptimizableOperator<?, I> optimizableOperator;
Build an InternalConnectableFluxOperator
wrapper around the passed parent ConnectableFlux
Params: - source – the
ConnectableFlux
to decorate
/**
* Build an {@link InternalConnectableFluxOperator} wrapper around the passed parent {@link ConnectableFlux}
*
* @param source the {@link ConnectableFlux} to decorate
*/
public InternalConnectableFluxOperator(ConnectableFlux<I> source) {
this.source = source;
if (source instanceof OptimizableOperator) {
@SuppressWarnings("unchecked")
OptimizableOperator<?, I> optimSource = (OptimizableOperator<?, I>) source;
this.optimizableOperator = optimSource;
}
else {
this.optimizableOperator = null;
}
}
@Override
@SuppressWarnings("unchecked")
public final void subscribe(CoreSubscriber<? super O> subscriber) {
OptimizableOperator operator = this;
try {
while (true) {
subscriber = operator.subscribeOrReturn(subscriber);
if (subscriber == null) {
// null means "I will subscribe myself", returning...
return;
}
OptimizableOperator newSource = operator.nextOptimizableSource();
if (newSource == null) {
operator.source().subscribe(subscriber);
return;
}
operator = newSource;
}
}
catch (Throwable e) {
Operators.reportThrowInSubscribe(subscriber, e);
return;
}
}
@Override
@Nullable
public abstract CoreSubscriber<? super I> subscribeOrReturn(CoreSubscriber<? super O> actual) throws Throwable;
@Override
public final CorePublisher<? extends I> source() {
return source;
}
@Override
public final OptimizableOperator<?, ? extends I> nextOptimizableSource() {
return optimizableOperator;
}
@Override
@Nullable
public Object scanUnsafe(Scannable.Attr key) {
if (key == Scannable.Attr.PREFETCH) return getPrefetch();
if (key == Scannable.Attr.PARENT) return source;
return null;
}
}