/*
* 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.concurrent.
Callable;
import reactor.core.
CoreSubscriber;
import reactor.core.
Fuseable;
import reactor.util.annotation.
Nullable;
/**
* For each subscriber, a Supplier is invoked and the returned value emitted.
*
* @param <T> the value type;
*/
final class
FluxCallable<T> extends
Flux<T> implements
Callable<T>,
Fuseable,
SourceProducer<T> {
final
Callable<T>
callable;
FluxCallable(
Callable<T>
callable) {
this.
callable =
callable;
}
@
Override
public void
subscribe(
CoreSubscriber<? super T>
actual) {
Operators.
MonoSubscriber<T, T>
wrapper = new
Operators.
MonoSubscriber<>(
actual);
actual.
onSubscribe(
wrapper);
try {
T
v =
callable.
call();
if (
v == null) {
wrapper.
onComplete();
}
else {
wrapper.
complete(
v);
}
}
catch (
Throwable ex) {
actual.
onError(
Operators.
onOperatorError(
ex,
actual.
currentContext()));
}
}
@
Override
@
Nullable
public T
call() throws
Exception {
return
callable.
call();
}
@
Override
public
Object scanUnsafe(
Attr key) {
return null; //no particular key to be represented, still useful in hooks
}
}