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/*
* Copyright (c) 2011-2017 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
*
* 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 reactor.core.publisher;
import java.util.function.Predicate;
import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.core.Scannable;
import reactor.util.annotation.Nullable;
/**
* Filters each 'rail' of the source ParallelFlux with a predicate function.
*
* @param the input value type
*/
final class ParallelFilter extends ParallelFlux implements Scannable{
final ParallelFlux source;
final Predicate predicate;
ParallelFilter(ParallelFlux source, Predicate predicate) {
this.source = source;
this.predicate = predicate;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return source;
if (key == Attr.PREFETCH) return getPrefetch();
return null;
}
@Override
@SuppressWarnings("unchecked")
public void subscribe(CoreSubscriber[] subscribers) {
if (!validate(subscribers)) {
return;
}
int n = subscribers.length;
CoreSubscriber[] parents = new CoreSubscriber[n];
boolean conditional = subscribers[0] instanceof Fuseable.ConditionalSubscriber;
for (int i = 0; i < n; i++) {
if (conditional) {
parents[i] = new FluxFilter.FilterConditionalSubscriber<>(
(Fuseable.ConditionalSubscriber)subscribers[i], predicate);
}
else {
parents[i] = new FluxFilter.FilterSubscriber<>(subscribers[i], predicate);
}
}
source.subscribe(parents);
}
@Override
public int parallelism() {
return source.parallelism();
}
}