Support @Scheduled fixedDelay/fixedRate on Publisher-returning methods
This commit adds support for `@Scheduled` annotation on reactive methods and Kotlin suspending functions. Reactive methods are methods that return a `Publisher` or a subclass of `Publisher`. The `ReactiveAdapterRegistry` is used to support many implementations, such as `Flux`, `Mono`, `Flow`, `Single`, etc. Methods should not take any argument and published values will be ignored, as they are already with synchronous support. This is implemented in `ScheduledAnnotationReactiveSupport`, which "converts" Publishers to `Runnable`. This strategy keeps track of active Subscriptions in the `ScheduledAnnotationBeanPostProcessor`, in order to cancel them all in case of shutdown. The existing scheduling support for tasks is reused, aligning the triggering behavior with the existing support: cron, fixedDelay and fixedRate are all supported strategies. If the `Publisher` errors, the exception is logged at warn level and otherwise ignored. As a result new `Runnable` instances will be created for each execution and scheduling will continue. The only difference with synchronous support is that error signals will not be thrown by those `Runnable` tasks and will not be made available to the `org.springframework.util.ErrorHandler` contract. This is due to the asynchronous and lazy nature of Publishers. Closes gh-23533 Closes gh-28515
This commit is contained in:
Simon Baslé
committed by
Brian Clozel
Brian Clozel
parent
53f891226e
commit
35052f2113
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/*
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* Copyright 2002-2023 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.scheduling.annotation;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.atomic.AtomicInteger;
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import io.reactivex.rxjava3.core.Completable;
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import io.reactivex.rxjava3.core.Flowable;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.ValueSource;
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import org.reactivestreams.Publisher;
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import reactor.core.publisher.Flux;
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import reactor.core.publisher.Mono;
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import org.springframework.core.annotation.AnnotationUtils;
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import org.springframework.util.ReflectionUtils;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
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import static org.springframework.scheduling.annotation.ScheduledAnnotationReactiveSupport.createSubscriptionRunnable;
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import static org.springframework.scheduling.annotation.ScheduledAnnotationReactiveSupport.getPublisherFor;
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import static org.springframework.scheduling.annotation.ScheduledAnnotationReactiveSupport.isReactive;
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class ScheduledAnnotationReactiveSupportTests {
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@Test
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void ensureReactor() {
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assertThat(ScheduledAnnotationReactiveSupport.reactorPresent).isTrue();
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}
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@ParameterizedTest
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@ValueSource(strings = { "mono", "flux", "monoString", "fluxString", "publisherMono",
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"publisherString", "monoThrows", "flowable", "completable" }) //note: monoWithParams can't be found by this test
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void checkIsReactive(String method) {
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Method m = ReflectionUtils.findMethod(ReactiveMethods.class, method);
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assertThat(isReactive(m)).as(m.getName()).isTrue();
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}
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@Test
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void checkNotReactive() {
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Method string = ReflectionUtils.findMethod(ReactiveMethods.class, "oops");
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assertThat(isReactive(string))
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.as("String-returning").isFalse();
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}
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@Test
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void rejectReactiveAdaptableButNotDeferred() {
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Method future = ReflectionUtils.findMethod(ReactiveMethods.class, "future");
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assertThatIllegalArgumentException().isThrownBy(() -> isReactive(future))
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.withMessage("Reactive methods may only be annotated with @Scheduled if the return type supports deferred execution");
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}
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@Test
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void isReactiveRejectsWithParams() {
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Method m = ReflectionUtils.findMethod(ReactiveMethods.class, "monoWithParam", String.class);
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//isReactive rejects with context
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assertThatIllegalArgumentException().isThrownBy(() -> isReactive(m))
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.withMessage("Reactive methods may only be annotated with @Scheduled if declared without arguments")
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.withNoCause();
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}
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@Test
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void rejectCantProducePublisher() {
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ReactiveMethods target = new ReactiveMethods();
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Method m = ReflectionUtils.findMethod(ReactiveMethods.class, "monoThrows");
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//static helper method
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assertThatIllegalArgumentException().isThrownBy(() -> getPublisherFor(m, target))
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.withMessage("Cannot obtain a Publisher-convertible value from the @Scheduled reactive method")
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.withCause(new IllegalStateException("expected"));
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}
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@Test
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void rejectCantAccessMethod() {
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ReactiveMethods target = new ReactiveMethods();
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Method m = ReflectionUtils.findMethod(ReactiveMethods.class, "monoThrowsIllegalAccess");
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//static helper method
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assertThatIllegalArgumentException().isThrownBy(() -> getPublisherFor(m, target))
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.withMessage("Cannot obtain a Publisher-convertible value from the @Scheduled reactive method")
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.withCause(new IllegalAccessException("expected"));
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}
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@Test
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void fixedDelayIsBlocking() {
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ReactiveMethods target = new ReactiveMethods();
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Method m = ReflectionUtils.findMethod(ReactiveMethods.class, "mono");
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Scheduled fixedDelayString = AnnotationUtils.synthesizeAnnotation(Map.of("fixedDelayString", "123"), Scheduled.class, null);
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Scheduled fixedDelayLong = AnnotationUtils.synthesizeAnnotation(Map.of("fixedDelay", 123L), Scheduled.class, null);
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List<Runnable> tracker = new ArrayList<>();
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assertThat(createSubscriptionRunnable(m, target, fixedDelayString, tracker))
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.isInstanceOfSatisfying(ScheduledAnnotationReactiveSupport.SubscribingRunnable.class, sr ->
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assertThat(sr.shouldBlock).as("fixedDelayString.shouldBlock").isTrue()
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);
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assertThat(createSubscriptionRunnable(m, target, fixedDelayLong, tracker))
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.isInstanceOfSatisfying(ScheduledAnnotationReactiveSupport.SubscribingRunnable.class, sr ->
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assertThat(sr.shouldBlock).as("fixedDelayLong.shouldBlock").isTrue()
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);
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}
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@Test
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void fixedRateIsNotBlocking() {
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ReactiveMethods target = new ReactiveMethods();
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Method m = ReflectionUtils.findMethod(ReactiveMethods.class, "mono");
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Scheduled fixedRateString = AnnotationUtils.synthesizeAnnotation(Map.of("fixedRateString", "123"), Scheduled.class, null);
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Scheduled fixedRateLong = AnnotationUtils.synthesizeAnnotation(Map.of("fixedRate", 123L), Scheduled.class, null);
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List<Runnable> tracker = new ArrayList<>();
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assertThat(createSubscriptionRunnable(m, target, fixedRateString, tracker))
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.isInstanceOfSatisfying(ScheduledAnnotationReactiveSupport.SubscribingRunnable.class, sr ->
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assertThat(sr.shouldBlock).as("fixedRateString.shouldBlock").isFalse()
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);
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assertThat(createSubscriptionRunnable(m, target, fixedRateLong, tracker))
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.isInstanceOfSatisfying(ScheduledAnnotationReactiveSupport.SubscribingRunnable.class, sr ->
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assertThat(sr.shouldBlock).as("fixedRateLong.shouldBlock").isFalse()
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);
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}
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@Test
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void cronIsNotBlocking() {
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ReactiveMethods target = new ReactiveMethods();
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Method m = ReflectionUtils.findMethod(ReactiveMethods.class, "mono");
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Scheduled cron = AnnotationUtils.synthesizeAnnotation(Map.of("cron", "-"), Scheduled.class, null);
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List<Runnable> tracker = new ArrayList<>();
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assertThat(createSubscriptionRunnable(m, target, cron, tracker))
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.isInstanceOfSatisfying(ScheduledAnnotationReactiveSupport.SubscribingRunnable.class, sr ->
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assertThat(sr.shouldBlock).as("cron.shouldBlock").isFalse()
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);
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}
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@Test
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void hasCheckpointToString() {
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ReactiveMethods target = new ReactiveMethods();
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Method m = ReflectionUtils.findMethod(ReactiveMethods.class, "mono");
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Publisher<?> p = getPublisherFor(m, target);
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assertThat(p.getClass().getName())
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.as("checkpoint class")
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.isEqualTo("reactor.core.publisher.FluxOnAssembly");
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assertThat(p).hasToString("checkpoint(\"@Scheduled 'mono()' in bean 'org.springframework.scheduling.annotation.ScheduledAnnotationReactiveSupportTests$ReactiveMethods'\")");
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}
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static class ReactiveMethods {
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public String oops() {
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return "oops";
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}
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public Mono<Void> mono() {
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return Mono.empty();
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}
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public Flux<Void> flux() {
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return Flux.empty();
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}
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public Mono<String> monoString() {
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return Mono.just("example");
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}
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public Flux<String> fluxString() {
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return Flux.just("example");
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}
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public Publisher<Void> publisherMono() {
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return Mono.empty();
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}
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public Publisher<String> publisherString() {
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return fluxString();
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}
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public CompletableFuture<String> future() {
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return CompletableFuture.completedFuture("example");
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}
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public Mono<Void> monoWithParam(String param) {
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return Mono.just(param).then();
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}
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public Mono<Void> monoThrows() {
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throw new IllegalStateException("expected");
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}
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public Mono<Void> monoThrowsIllegalAccess() throws IllegalAccessException {
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//simulate a reflection issue
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throw new IllegalAccessException("expected");
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}
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public Flowable<Void> flowable() {
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return Flowable.empty();
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}
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public Completable completable() {
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return Completable.complete();
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}
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AtomicInteger subscription = new AtomicInteger();
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public Mono<Void> trackingMono() {
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return Mono.<Void>empty()
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.doOnSubscribe(s -> subscription.incrementAndGet());
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}
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public Mono<Void> monoError() {
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return Mono.error(new IllegalStateException("expected"));
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}
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}
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}
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