/*
 * 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.Function;

import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.core.Scannable;
import reactor.util.annotation.Nullable;

Maps each 'rail' of the source ParallelFlux with a mapper function.
Type parameters:
  • <T> – the input value type
  • <R> – the output value type
/** * Maps each 'rail' of the source ParallelFlux with a mapper function. * * @param <T> the input value type * @param <R> the output value type */
final class ParallelMap<T, R> extends ParallelFlux<R> implements Scannable { final ParallelFlux<T> source; final Function<? super T, ? extends R> mapper; ParallelMap(ParallelFlux<T> source, Function<? super T, ? extends R> mapper) { this.source = source; this.mapper = mapper; } @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<? super R>[] subscribers) { if (!validate(subscribers)) { return; } int n = subscribers.length; CoreSubscriber<? super T>[] parents = new CoreSubscriber[n]; boolean conditional = subscribers[0] instanceof Fuseable.ConditionalSubscriber; for (int i = 0; i < n; i++) { if (conditional) { parents[i] = new FluxMap.MapConditionalSubscriber<>((Fuseable.ConditionalSubscriber<R>) subscribers[i], mapper); } else { parents[i] = new FluxMap.MapSubscriber<>(subscribers[i], mapper); } } source.subscribe(parents); } @Override public int parallelism() { return source.parallelism(); } }