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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) 2017-2023 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.Objects;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.util.function.Function;
import java.util.stream.Stream;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscription;
import reactor.core.CorePublisher;
import reactor.core.CoreSubscriber;
import reactor.core.Exceptions;
import reactor.core.Scannable;
import reactor.util.annotation.Nullable;
import reactor.util.context.Context;
/**
* Waits for a Mono source to terminate or produce a value, in which case the value is
* mapped to a Publisher used as a delay: its termination will trigger the actual emission
* of the value downstream. If the Mono source didn't produce a value, terminate with the
* same signal (empty completion or error).
*
* @param the value type
*
* @author Simon Baslé
*/
final class MonoDelayUntil extends Mono implements Scannable,
OptimizableOperator {
final Mono source;
Function>[] otherGenerators;
@Nullable
final OptimizableOperator optimizableOperator;
@SuppressWarnings("unchecked")
MonoDelayUntil(Mono monoSource,
Function> triggerGenerator) {
this.source = Objects.requireNonNull(monoSource, "monoSource");
this.otherGenerators = new Function[] { Objects.requireNonNull(triggerGenerator, "triggerGenerator")};
this.optimizableOperator = source instanceof OptimizableOperator ? (OptimizableOperator) source : null;
}
MonoDelayUntil(Mono monoSource,
Function>[] triggerGenerators) {
this.source = Objects.requireNonNull(monoSource, "monoSource");
this.otherGenerators = triggerGenerators;
if (source instanceof OptimizableOperator) {
@SuppressWarnings("unchecked")
OptimizableOperator optimSource = (OptimizableOperator) source;
this.optimizableOperator = optimSource;
}
else {
this.optimizableOperator = null;
}
}
/**
* Add a trigger generator to wait for.
* @param delayError the delayError parameter for the trigger being added, ignored if already true
* @param triggerGenerator the new trigger to add to the copy of the operator
* @return a new {@link MonoDelayUntil} instance with same source but additional trigger generator
*/
@SuppressWarnings("unchecked")
MonoDelayUntil copyWithNewTriggerGenerator(boolean delayError,
Function> triggerGenerator) {
Objects.requireNonNull(triggerGenerator, "triggerGenerator");
Function>[] oldTriggers = this.otherGenerators;
Function>[] newTriggers = new Function[oldTriggers.length + 1];
System.arraycopy(oldTriggers, 0, newTriggers, 0, oldTriggers.length);
newTriggers[oldTriggers.length] = triggerGenerator;
return new MonoDelayUntil<>(this.source, newTriggers);
}
@Override
public void subscribe(CoreSubscriber actual) {
try {
Operators.toFluxOrMono(source).subscribe(subscribeOrReturn(actual));
}
catch (Throwable e) {
Operators.error(actual, Operators.onOperatorError(e, actual.currentContext()));
return;
}
}
@Override
public final CoreSubscriber subscribeOrReturn(CoreSubscriber actual) throws Throwable {
DelayUntilCoordinator parent = new DelayUntilCoordinator<>(actual, otherGenerators);
actual.onSubscribe(parent);
return parent;
}
@Override
public final CorePublisher source() {
return source;
}
@Override
public final OptimizableOperator nextOptimizableSource() {
return optimizableOperator;
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
if (key == InternalProducerAttr.INSTANCE) return true;
return null; //no particular key to be represented, still useful in hooks
}
static final class DelayUntilCoordinator implements InnerOperator {
final Function>[] otherGenerators;
final CoreSubscriber actual;
int index;
T value;
boolean done;
Subscription s;
DelayUntilTrigger triggerSubscriber;
volatile Throwable error;
@SuppressWarnings("rawtypes")
static final AtomicReferenceFieldUpdater ERROR =
AtomicReferenceFieldUpdater.newUpdater(DelayUntilCoordinator.class, Throwable.class, "error");
volatile int state;
@SuppressWarnings("rawtypes")
static final AtomicIntegerFieldUpdater STATE =
AtomicIntegerFieldUpdater.newUpdater(DelayUntilCoordinator.class, "state");
static final int HAS_SUBSCRIPTION = 0b00000000000000000000000000000001;
static final int HAS_INNER = 0b00000000000000000000000000000010;
static final int HAS_REQUEST = 0b00000000000000000000000000000100;
static final int HAS_VALUE = 0b00000000000000000000000000001000;
static final int TERMINATED = 0b10000000000000000000000000000000;
DelayUntilCoordinator(CoreSubscriber subscriber,
Function>[] otherGenerators) {
this.actual = subscriber;
this.otherGenerators = otherGenerators;
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = s;
int previousState = markHasSubscription();
if (isTerminated(previousState)) {
s.cancel();
return;
}
s.request(Long.MAX_VALUE);
}
}
@Override
public void onNext(T t) {
if (this.done) {
Operators.onDiscard(t, this.actual.currentContext());
return;
}
this.value = t;
subscribeNextTrigger();
}
@Override
public void onError(Throwable t) {
if (this.done) {
Operators.onErrorDropped(t, this.actual.currentContext());
return;
}
this.done = true;
if (this.value == null) {
this.actual.onError(t);
return;
}
if (!Exceptions.addThrowable(ERROR, this, t)) {
Operators.onErrorDropped(t, this.actual.currentContext());
return;
}
final int previousState = markTerminated();
if (isTerminated(previousState)) {
return;
}
if (hasInner(previousState)) {
Operators.onDiscard(this.value, this.actual.currentContext());
this.triggerSubscriber.cancel();
}
final Throwable e = Exceptions.terminate(ERROR, this);
//noinspection ConstantConditions
this.actual.onError(e);
}
@Override
public void onComplete() {
if (this.done) {
return;
}
if (this.value == null) {
this.done = true;
this.actual.onComplete();
}
}
@Override
public void request(long n) {
if (Operators.validate(n)) {
final int previousState = markHasRequest();
if (isTerminated(previousState)) {
return;
}
if (hasRequest(previousState)) {
return;
}
if (hasValue(previousState)) {
this.done = true;
final CoreSubscriber actual = this.actual;
final T v = this.value;
actual.onNext(v);
actual.onComplete();
}
}
}
@Override
public void cancel() {
final int previousState = markTerminated();
if (isTerminated(previousState)) {
return;
}
final Throwable t = Exceptions.terminate(ERROR, this);
if (t != null) {
Operators.onErrorDropped(t, this.actual.currentContext());
}
if (hasSubscription(previousState)) {
this.s.cancel();
}
if (hasInner(previousState)) {
Operators.onDiscard(this.value, this.actual.currentContext());
this.triggerSubscriber.cancel();
}
}
@SuppressWarnings({"unchecked", "rawtypes"})
void subscribeNextTrigger() {
final Function> generator =
this.otherGenerators[this.index];
Publisher p;
try {
p = generator.apply(this.value);
Objects.requireNonNull(p, "mapper returned null value");
}
catch (Throwable t) {
onError(t);
return;
}
DelayUntilTrigger triggerSubscriber = this.triggerSubscriber;
if (triggerSubscriber == null) {
triggerSubscriber = new DelayUntilTrigger<>(this);
this.triggerSubscriber = triggerSubscriber;
}
p = Operators.toFluxOrMono(p);
p.subscribe(triggerSubscriber);
}
@Override
public CoreSubscriber actual() {
return this.actual;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.CANCELLED) return isTerminated(this.state) && !this.done;
if (key == Attr.TERMINATED) return isTerminated(this.state) && this.done;
if (key == Attr.PREFETCH) return Integer.MAX_VALUE;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
@Override
public Stream inners() {
final DelayUntilTrigger subscriber = this.triggerSubscriber;
return subscriber == null ? Stream.empty() : Stream.of(subscriber);
}
/**
* Sets flag has subscription to indicate that we have already received
* subscription from the value upstream
*
* @return previous state
*/
int markHasSubscription() {
for (;;) {
final int state = this.state;
if (isTerminated(state)) {
return TERMINATED;
}
if (STATE.compareAndSet(this, state, state | HAS_SUBSCRIPTION)) {
return state;
}
}
}
/**
* Sets {@link #HAS_REQUEST} flag which indicates that there is a demand from
* the downstream
*
* @return previous state
*/
int markHasRequest() {
for (; ; ) {
final int state = this.state;
if (isTerminated(state)) {
return TERMINATED;
}
if (hasRequest(state)) {
return state;
}
final int nextState;
if (hasValue(state)) {
nextState = TERMINATED;
}
else {
nextState = state | HAS_REQUEST;
}
if (STATE.compareAndSet(this, state, nextState)) {
return state;
}
}
}
/**
* Sets current state to {@link #TERMINATED}
*
* @return previous state
*/
int markTerminated() {
for (;;) {
final int state = this.state;
if (isTerminated(state)) {
return TERMINATED;
}
if (STATE.compareAndSet(this, state, TERMINATED)) {
return state;
}
}
}
/**
* Terminates execution if there is a demand from the downstream or sets
* {@link #HAS_VALUE} flag indicating that the delay process is completed
* however there is no demand from the downstream yet
*/
void complete() {
for (; ; ) {
int s = this.state;
if (isTerminated(s)) {
return;
}
if (hasRequest(s) && STATE.compareAndSet(this, s, TERMINATED)) {
final CoreSubscriber actual = this.actual;
final T v = this.value;
actual.onNext(v);
actual.onComplete();
return;
}
if (STATE.compareAndSet(this, s, s | HAS_VALUE)) {
return;
}
}
}
}
static final class DelayUntilTrigger implements InnerConsumer {
final DelayUntilCoordinator parent;
Subscription s;
boolean done;
Throwable error;
DelayUntilTrigger(DelayUntilCoordinator parent) {
this.parent = parent;
}
@Override
public Context currentContext() {
return parent.currentContext();
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.CANCELLED) return isTerminated(this.parent.state) && !this.done;
if (key == Attr.PARENT) return this.s;
if (key == Attr.ACTUAL) return this.parent;
if (key == Attr.ERROR) return this.error;
if (key == Attr.PREFETCH) return Integer.MAX_VALUE;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return null;
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = s;
int previousState = markInnerActive();
if (isTerminated(previousState)) {
s.cancel();
final DelayUntilCoordinator parent = this.parent;
Operators.onDiscard(parent.value, parent.currentContext());
return;
}
s.request(Long.MAX_VALUE);
}
}
@Override
public void onNext(T t) {
//NO-OP
Operators.onDiscard(t, this.parent.currentContext());
}
@Override
public void onError(Throwable t) {
if (this.done) {
Operators.onErrorDropped(t, parent.currentContext());
return;
}
final DelayUntilCoordinator parent = this.parent;
this.done = true;
parent.done = true;
if (!Exceptions.addThrowable(DelayUntilCoordinator.ERROR, parent, t)) {
Operators.onErrorDropped(t, parent.currentContext());
return;
}
final int previousState = parent.markTerminated();
if (isTerminated(previousState)) {
return;
}
Operators.onDiscard(parent.value, parent.currentContext());
parent.s.cancel();
final Throwable e = Exceptions.terminate(DelayUntilCoordinator.ERROR, parent);
//noinspection ConstantConditions
parent.actual.onError(e);
}
@Override
public void onComplete() {
if (this.done) {
return;
}
this.done = true;
final DelayUntilCoordinator parent = this.parent;
final int nextIndex = parent.index + 1;
parent.index = nextIndex;
if (nextIndex == parent.otherGenerators.length) {
parent.complete();
return;
}
final int previousState = markInnerInactive();
if (isTerminated(previousState)) {
return;
}
// we have to reset the state since we reuse the same object for the
// optimization purpose and at this stage we know that there is another
// delayer Publisher to subscribe to
this.done = false;
this.s = null;
parent.subscribeNextTrigger();
}
void cancel() {
this.s.cancel();
}
/**
* Sets flag {@link DelayUntilCoordinator#HAS_INNER} which indicates that there
* is an active delayer Publisher
*
* @return previous state
*/
int markInnerActive() {
final DelayUntilCoordinator parent = this.parent;
for (;;) {
final int state = parent.state;
if (isTerminated(state)) {
return DelayUntilCoordinator.TERMINATED;
}
if (hasInner(state)) {
return state;
}
if (DelayUntilCoordinator.STATE.compareAndSet(parent, state, state | DelayUntilCoordinator.HAS_INNER)) {
return state;
}
}
}
/**
* Unsets flag {@link DelayUntilCoordinator#HAS_INNER}
*
* @return previous state
*/
int markInnerInactive() {
final DelayUntilCoordinator parent = this.parent;
for (;;) {
final int state = parent.state;
if (isTerminated(state)) {
return DelayUntilCoordinator.TERMINATED;
}
if (!hasInner(state)) {
return state;
}
if (DelayUntilCoordinator.STATE.compareAndSet(parent, state, state &~ DelayUntilCoordinator.HAS_INNER)) {
return state;
}
}
}
}
/**
* Indicates if state is ended with cancellation | error | complete
*/
static boolean isTerminated(int state) {
return state == DelayUntilCoordinator.TERMINATED;
}
static boolean hasValue(int state) {
return (state & DelayUntilCoordinator.HAS_VALUE) == DelayUntilCoordinator.HAS_VALUE;
}
static boolean hasInner(int state) {
return (state & DelayUntilCoordinator.HAS_INNER) == DelayUntilCoordinator.HAS_INNER;
}
static boolean hasRequest(int state) {
return (state & DelayUntilCoordinator.HAS_REQUEST) == DelayUntilCoordinator.HAS_REQUEST;
}
static boolean hasSubscription(int state) {
return (state & DelayUntilCoordinator.HAS_SUBSCRIPTION) == DelayUntilCoordinator.HAS_SUBSCRIPTION;
}
}
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