/*
 * 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.Queue;
import java.util.function.Function;
import java.util.function.Supplier;

import org.reactivestreams.Publisher;
import reactor.core.CoreSubscriber;
import reactor.core.Scannable;
import reactor.util.annotation.Nullable;

Flattens the generated Publishers on each rail.
Type parameters:
  • <T> – the input value type
  • <R> – the output value type
/** * Flattens the generated Publishers on each rail. * * @param <T> the input value type * @param <R> the output value type */
final class ParallelFlatMap<T, R> extends ParallelFlux<R> implements Scannable{ final ParallelFlux<T> source; final Function<? super T, ? extends Publisher<? extends R>> mapper; final boolean delayError; final int maxConcurrency; final Supplier<? extends Queue<R>> mainQueueSupplier; final int prefetch; final Supplier<? extends Queue<R>> innerQueueSupplier; ParallelFlatMap( ParallelFlux<T> source, Function<? super T, ? extends Publisher<? extends R>> mapper, boolean delayError, int maxConcurrency, Supplier<? extends Queue<R>> mainQueueSupplier, int prefetch, Supplier<? extends Queue<R>> innerQueueSupplier) { this.source = source; this.mapper = mapper; this.delayError = delayError; this.maxConcurrency = maxConcurrency; this.mainQueueSupplier = mainQueueSupplier; this.prefetch = prefetch; this.innerQueueSupplier = innerQueueSupplier; } @Override @Nullable public Object scanUnsafe(Attr key) { if (key == Attr.PARENT) return source; if (key == Attr.PREFETCH) return getPrefetch(); if (key == Attr.DELAY_ERROR) return delayError; return null; } @Override public int getPrefetch() { return prefetch; } @Override public int parallelism() { return source.parallelism(); } @Override public void subscribe(CoreSubscriber<? super R>[] subscribers) { if (!validate(subscribers)) { return; } int n = subscribers.length; @SuppressWarnings("unchecked") CoreSubscriber<T>[] parents = new CoreSubscriber[n]; for (int i = 0; i < n; i++) { parents[i] = new FluxFlatMap.FlatMapMain<>(subscribers[i], mapper, delayError, maxConcurrency, mainQueueSupplier, prefetch, innerQueueSupplier); } source.subscribe(parents); } }