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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* Copyright (c) 2016-2021 VMware Inc. or its affiliates, 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
*
* https://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.RejectedExecutionException;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Disposable;
import reactor.core.Scannable;
import reactor.core.scheduler.Scheduler;
import reactor.util.annotation.Nullable;
/**
* Schedules the emission of the value or completion of the wrapped Mono via
* the given Scheduler.
*
* @param the value type
*/
final class MonoPublishOn extends InternalMonoOperator {
final Scheduler scheduler;
MonoPublishOn(Mono extends T> source, Scheduler scheduler) {
super(source);
this.scheduler = scheduler;
}
@Override
public CoreSubscriber super T> subscribeOrReturn(CoreSubscriber super T> actual) {
return new PublishOnSubscriber(actual, scheduler);
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_ON) return scheduler;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.ASYNC;
return super.scanUnsafe(key);
}
static final class PublishOnSubscriber
implements InnerOperator, Runnable {
final CoreSubscriber super T> actual;
final Scheduler scheduler;
Subscription s;
volatile Disposable future;
@SuppressWarnings("rawtypes")
static final AtomicReferenceFieldUpdater
FUTURE =
AtomicReferenceFieldUpdater.newUpdater(PublishOnSubscriber.class,
Disposable.class,
"future");
volatile T value;
@SuppressWarnings("rawtypes")
static final AtomicReferenceFieldUpdater
VALUE =
AtomicReferenceFieldUpdater.newUpdater(PublishOnSubscriber.class,
Object.class,
"value");
volatile Throwable error;
PublishOnSubscriber(CoreSubscriber super T> actual,
Scheduler scheduler) {
this.actual = actual;
this.scheduler = scheduler;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.CANCELLED) return future == OperatorDisposables.DISPOSED;
if (key == Attr.PARENT) return s;
if (key == Attr.ERROR) return error;
if (key == Attr.RUN_ON) return scheduler;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.ASYNC;
return InnerOperator.super.scanUnsafe(key);
}
@Override
public CoreSubscriber super T> actual() {
return actual;
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
value = t;
trySchedule(this, null, t);
}
@Override
public void onError(Throwable t) {
error = t;
trySchedule(null, t, null);
}
@Override
public void onComplete() {
if (value == null) {
trySchedule(null, null, null);
}
}
void trySchedule(
@Nullable Subscription subscription,
@Nullable Throwable suppressed,
@Nullable Object dataSignal) {
if(future != null){
return;
}
try {
future = this.scheduler.schedule(this);
}
catch (RejectedExecutionException ree) {
actual.onError(Operators.onRejectedExecution(ree, subscription,
suppressed, dataSignal, actual.currentContext()));
}
}
@Override
public void request(long n) {
s.request(n);
}
@Override
public void cancel() {
Disposable c = future;
if (c != OperatorDisposables.DISPOSED) {
c = FUTURE.getAndSet(this, OperatorDisposables.DISPOSED);
if (c != null && !OperatorDisposables.isDisposed(c)) {
c.dispose();
}
value = null;
}
s.cancel();
}
@Override
@SuppressWarnings("unchecked")
public void run() {
if (OperatorDisposables.isDisposed(future)) {
return;
}
T v = (T)VALUE.getAndSet(this, null);
if (v != null) {
actual.onNext(v);
actual.onComplete();
}
else {
Throwable e = error;
if (e != null) {
actual.onError(e);
}
else {
actual.onComplete();
}
}
}
}
}
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