/*
* 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.
Objects;
import java.util.function.
BiFunction;
import org.reactivestreams.
Publisher;
import reactor.core.
CoreSubscriber;
import reactor.core.
Scannable;
import reactor.util.annotation.
Nullable;
/**
* @author Stephane Maldini
*/
final class
ParallelLift<I, O> extends
ParallelFlux<O> implements
Scannable {
final
BiFunction<
Publisher, ? super
CoreSubscriber<? super O>, ? extends
CoreSubscriber<? super I>>
lifter;
final
ParallelFlux<I>
source;
ParallelLift(
ParallelFlux<I>
p,
BiFunction<
Publisher, ? super
CoreSubscriber<? super O>, ? extends
CoreSubscriber<? super I>>
lifter) {
this.
source =
Objects.
requireNonNull(
p, "source");
this.
lifter =
lifter;
}
@
Override
public int
getPrefetch() {
return
source.
getPrefetch();
}
@
Override
public int
parallelism() {
return
source.
parallelism();
}
@
Override
@
Nullable
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
PARENT) {
return
source;
}
if (
key ==
Attr.
PREFETCH) {
return
getPrefetch();
}
return null;
}
@
Override
protected void
subscribe(
CoreSubscriber<? super O>[]
s) {
@
SuppressWarnings("unchecked")
CoreSubscriber<? super I>[]
subscribers =
new
CoreSubscriber[
parallelism()];
int
i = 0;
while (
i <
subscribers.length) {
subscribers[
i] =
Objects.
requireNonNull(
lifter.
apply(
source,
s[
i]),
"Lifted subscriber MUST NOT be null");
i++;
}
source.
subscribe(
subscribers);
}
}