/*
* 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.
Collection;
import java.util.
Objects;
import java.util.function.
Supplier;
import org.reactivestreams.
Subscription;
import reactor.core.
CoreSubscriber;
import reactor.core.
Fuseable;
import reactor.util.annotation.
Nullable;
/**
* Buffers all values from the source Publisher and emits it as a single Collection.
*
* @param <T> the source value type
* @param <C> the collection type that takes any supertype of T
*/
final class
MonoCollectList<T, C extends
Collection<? super T>>
extends
MonoFromFluxOperator<T, C>
implements
Fuseable {
final
Supplier<C>
collectionSupplier;
MonoCollectList(
Flux<? extends T>
source,
Supplier<C>
collectionSupplier) {
super(
source);
this.
collectionSupplier =
collectionSupplier;
}
@
Override
public void
subscribe(
CoreSubscriber<? super C>
actual) {
C
collection;
try {
collection =
Objects.
requireNonNull(
collectionSupplier.
get(),
"The collectionSupplier returned a null collection");
}
catch (
Throwable ex) {
Operators.
error(
actual,
Operators.
onOperatorError(
ex,
actual.
currentContext()));
return;
}
source.
subscribe(new
MonoBufferAllSubscriber<>(
actual,
collection));
}
static final class
MonoBufferAllSubscriber<T, C extends
Collection<? super T>>
extends
Operators.
MonoSubscriber<T, C> {
C
collection;
Subscription s;
MonoBufferAllSubscriber(
CoreSubscriber<? super C>
actual, C
collection) {
super(
actual);
this.
collection =
collection;
}
@
Override
@
Nullable
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
PARENT) return
s;
if (
key ==
Attr.
TERMINATED) return
collection == null;
return super.scanUnsafe(
key);
}
@
Override
public void
onSubscribe(
Subscription s) {
if (
Operators.
validate(this.
s,
s)) {
this.
s =
s;
actual.
onSubscribe(this);
s.
request(
Long.
MAX_VALUE);
}
}
@
Override
public void
onNext(T
t) {
collection.
add(
t);
}
@
Override
public void
onError(
Throwable t) {
C
c =
collection;
if(
c == null){
return;
}
collection = null;
Operators.
onDiscardMultiple(
c,
currentContext());
actual.
onError(
t);
}
@
Override
public void
onComplete() {
C
c =
collection;
if(
c == null){
return;
}
collection = null;
complete(
c);
}
@
Override
public void
cancel() {
//specific discard of the collection
Operators.
onDiscardMultiple(
collection,
currentContext());
super.cancel();
s.
cancel();
}
}
}