spring ScheduledAnnotationBeanPostProcessor 源码
spring ScheduledAnnotationBeanPostProcessor 代码
文件路径：/spring-context/src/main/java/org/springframework/scheduling/annotation/ScheduledAnnotationBeanPostProcessor.java
/*
* Copyright 2002-2022 the original author or authors.
*
* 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 org.springframework.scheduling.annotation;
import java.lang.reflect.Method;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TimeZone;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.aop.framework.AopInfrastructureBean;
import org.springframework.aop.framework.AopProxyUtils;
import org.springframework.aop.support.AopUtils;
import org.springframework.aot.hint.RuntimeHints;
import org.springframework.aot.hint.RuntimeHintsRegistrar;
import org.springframework.aot.hint.support.RuntimeHintsUtils;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.NoUniqueBeanDefinitionException;
import org.springframework.beans.factory.SmartInitializingSingleton;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.beans.factory.config.DestructionAwareBeanPostProcessor;
import org.springframework.beans.factory.config.NamedBeanHolder;
import org.springframework.beans.factory.support.MergedBeanDefinitionPostProcessor;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationListener;
import org.springframework.context.EmbeddedValueResolverAware;
import org.springframework.context.annotation.ImportRuntimeHints;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.core.MethodIntrospector;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.lang.Nullable;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.ScheduledAnnotationsRuntimeHints;
import org.springframework.scheduling.config.CronTask;
import org.springframework.scheduling.config.FixedDelayTask;
import org.springframework.scheduling.config.FixedRateTask;
import org.springframework.scheduling.config.ScheduledTask;
import org.springframework.scheduling.config.ScheduledTaskHolder;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.scheduling.support.ScheduledMethodRunnable;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import org.springframework.util.StringValueResolver;
/**
* Bean post-processor that registers methods annotated with
* {@link Scheduled @Scheduled} to be invoked by a
* {@link org.springframework.scheduling.TaskScheduler} according to the
* "fixedRate", "fixedDelay", or "cron" expression provided via the annotation.
*
* <p>This post-processor is automatically registered by Spring's
* {@code <task:annotation-driven>} XML element, and also by the
* {@link EnableScheduling @EnableScheduling} annotation.
*
* <p>Autodetects any {@link SchedulingConfigurer} instances in the container,
* allowing for customization of the scheduler to be used or for fine-grained
* control over task registration (e.g. registration of {@link Trigger} tasks).
* See the {@link EnableScheduling @EnableScheduling} javadocs for complete usage
* details.
*
* @author Mark Fisher
* @author Juergen Hoeller
* @author Chris Beams
* @author Elizabeth Chatman
* @author Victor Brown
* @author Sam Brannen
* @since 3.0
* @see Scheduled
* @see EnableScheduling
* @see SchedulingConfigurer
* @see org.springframework.scheduling.TaskScheduler
* @see org.springframework.scheduling.config.ScheduledTaskRegistrar
* @see AsyncAnnotationBeanPostProcessor
*/
@ImportRuntimeHints(ScheduledAnnotationsRuntimeHints.class)
public class ScheduledAnnotationBeanPostProcessor
implements ScheduledTaskHolder, MergedBeanDefinitionPostProcessor, DestructionAwareBeanPostProcessor,
Ordered, EmbeddedValueResolverAware, BeanNameAware, BeanFactoryAware, ApplicationContextAware,
SmartInitializingSingleton, ApplicationListener<ContextRefreshedEvent>, DisposableBean {
/**
* The default name of the {@link TaskScheduler} bean to pick up: {@value}.
* <p>Note that the initial lookup happens by type; this is just the fallback
* in case of multiple scheduler beans found in the context.
* @since 4.2
*/
public static final String DEFAULT_TASK_SCHEDULER_BEAN_NAME = "taskScheduler";
protected final Log logger = LogFactory.getLog(getClass());
private final ScheduledTaskRegistrar registrar;
@Nullable
private Object scheduler;
@Nullable
private StringValueResolver embeddedValueResolver;
@Nullable
private String beanName;
@Nullable
private BeanFactory beanFactory;
@Nullable
private ApplicationContext applicationContext;
private final Set<Class<?>> nonAnnotatedClasses = Collections.newSetFromMap(new ConcurrentHashMap<>(64));
private final Map<Object, Set<ScheduledTask>> scheduledTasks = new IdentityHashMap<>(16);
/**
* Create a default {@code ScheduledAnnotationBeanPostProcessor}.
*/
public ScheduledAnnotationBeanPostProcessor() {
this.registrar = new ScheduledTaskRegistrar();
}
/**
* Create a {@code ScheduledAnnotationBeanPostProcessor} delegating to the
* specified {@link ScheduledTaskRegistrar}.
* @param registrar the ScheduledTaskRegistrar to register {@code @Scheduled}
* tasks on
* @since 5.1
*/
public ScheduledAnnotationBeanPostProcessor(ScheduledTaskRegistrar registrar) {
Assert.notNull(registrar, "ScheduledTaskRegistrar is required");
this.registrar = registrar;
}
@Override
public int getOrder() {
return LOWEST_PRECEDENCE;
}
/**
* Set the {@link org.springframework.scheduling.TaskScheduler} that will invoke
* the scheduled methods, or a {@link java.util.concurrent.ScheduledExecutorService}
* to be wrapped as a TaskScheduler.
* <p>If not specified, default scheduler resolution will apply: searching for a
* unique {@link TaskScheduler} bean in the context, or for a {@link TaskScheduler}
* bean named "taskScheduler" otherwise; the same lookup will also be performed for
* a {@link ScheduledExecutorService} bean. If neither of the two is resolvable,
* a local single-threaded default scheduler will be created within the registrar.
* @see #DEFAULT_TASK_SCHEDULER_BEAN_NAME
*/
public void setScheduler(Object scheduler) {
this.scheduler = scheduler;
}
@Override
public void setEmbeddedValueResolver(StringValueResolver resolver) {
this.embeddedValueResolver = resolver;
}
@Override
public void setBeanName(String beanName) {
this.beanName = beanName;
}
/**
* Making a {@link BeanFactory} available is optional; if not set,
* {@link SchedulingConfigurer} beans won't get autodetected and
* a {@link #setScheduler scheduler} has to be explicitly configured.
*/
@Override
public void setBeanFactory(BeanFactory beanFactory) {
this.beanFactory = beanFactory;
}
/**
* Setting an {@link ApplicationContext} is optional: If set, registered
* tasks will be activated in the {@link ContextRefreshedEvent} phase;
* if not set, it will happen at {@link #afterSingletonsInstantiated} time.
*/
@Override
public void setApplicationContext(ApplicationContext applicationContext) {
this.applicationContext = applicationContext;
if (this.beanFactory == null) {
this.beanFactory = applicationContext;
}
}
@Override
public void afterSingletonsInstantiated() {
// Remove resolved singleton classes from cache
this.nonAnnotatedClasses.clear();
if (this.applicationContext == null) {
// Not running in an ApplicationContext -> register tasks early...
finishRegistration();
}
}
@Override
public void onApplicationEvent(ContextRefreshedEvent event) {
if (event.getApplicationContext() == this.applicationContext) {
// Running in an ApplicationContext -> register tasks this late...
// giving other ContextRefreshedEvent listeners a chance to perform
// their work at the same time (e.g. Spring Batch's job registration).
finishRegistration();
}
}
private void finishRegistration() {
if (this.scheduler != null) {
this.registrar.setScheduler(this.scheduler);
}
if (this.beanFactory instanceof ListableBeanFactory) {
Map<String, SchedulingConfigurer> beans =
((ListableBeanFactory) this.beanFactory).getBeansOfType(SchedulingConfigurer.class);
List<SchedulingConfigurer> configurers = new ArrayList<>(beans.values());
AnnotationAwareOrderComparator.sort(configurers);
for (SchedulingConfigurer configurer : configurers) {
configurer.configureTasks(this.registrar);
}
}
if (this.registrar.hasTasks() && this.registrar.getScheduler() == null) {
Assert.state(this.beanFactory != null, "BeanFactory must be set to find scheduler by type");
try {
// Search for TaskScheduler bean...
this.registrar.setTaskScheduler(resolveSchedulerBean(this.beanFactory, TaskScheduler.class, false));
}
catch (NoUniqueBeanDefinitionException ex) {
if (logger.isTraceEnabled()) {
logger.trace("Could not find unique TaskScheduler bean - attempting to resolve by name: " +
ex.getMessage());
}
try {
this.registrar.setTaskScheduler(resolveSchedulerBean(this.beanFactory, TaskScheduler.class, true));
}
catch (NoSuchBeanDefinitionException ex2) {
if (logger.isInfoEnabled()) {
logger.info("More than one TaskScheduler bean exists within the context, and " +
"none is named 'taskScheduler'. Mark one of them as primary or name it 'taskScheduler' " +
"(possibly as an alias); or implement the SchedulingConfigurer interface and call " +
"ScheduledTaskRegistrar#setScheduler explicitly within the configureTasks() callback: " +
ex.getBeanNamesFound());
}
}
}
catch (NoSuchBeanDefinitionException ex) {
if (logger.isTraceEnabled()) {
logger.trace("Could not find default TaskScheduler bean - attempting to find ScheduledExecutorService: " +
ex.getMessage());
}
// Search for ScheduledExecutorService bean next...
try {
this.registrar.setScheduler(resolveSchedulerBean(this.beanFactory, ScheduledExecutorService.class, false));
}
catch (NoUniqueBeanDefinitionException ex2) {
if (logger.isTraceEnabled()) {
logger.trace("Could not find unique ScheduledExecutorService bean - attempting to resolve by name: " +
ex2.getMessage());
}
try {
this.registrar.setScheduler(resolveSchedulerBean(this.beanFactory, ScheduledExecutorService.class, true));
}
catch (NoSuchBeanDefinitionException ex3) {
if (logger.isInfoEnabled()) {
logger.info("More than one ScheduledExecutorService bean exists within the context, and " +
"none is named 'taskScheduler'. Mark one of them as primary or name it 'taskScheduler' " +
"(possibly as an alias); or implement the SchedulingConfigurer interface and call " +
"ScheduledTaskRegistrar#setScheduler explicitly within the configureTasks() callback: " +
ex2.getBeanNamesFound());
}
}
}
catch (NoSuchBeanDefinitionException ex2) {
if (logger.isTraceEnabled()) {
logger.trace("Could not find default ScheduledExecutorService bean - falling back to default: " +
ex2.getMessage());
}
// Giving up -> falling back to default scheduler within the registrar...
logger.info("No TaskScheduler/ScheduledExecutorService bean found for scheduled processing");
}
}
}
this.registrar.afterPropertiesSet();
}
private <T> T resolveSchedulerBean(BeanFactory beanFactory, Class<T> schedulerType, boolean byName) {
if (byName) {
T scheduler = beanFactory.getBean(DEFAULT_TASK_SCHEDULER_BEAN_NAME, schedulerType);
if (this.beanName != null && this.beanFactory instanceof ConfigurableBeanFactory) {
((ConfigurableBeanFactory) this.beanFactory).registerDependentBean(
DEFAULT_TASK_SCHEDULER_BEAN_NAME, this.beanName);
}
return scheduler;
}
else if (beanFactory instanceof AutowireCapableBeanFactory) {
NamedBeanHolder<T> holder = ((AutowireCapableBeanFactory) beanFactory).resolveNamedBean(schedulerType);
if (this.beanName != null && beanFactory instanceof ConfigurableBeanFactory) {
((ConfigurableBeanFactory) beanFactory).registerDependentBean(holder.getBeanName(), this.beanName);
}
return holder.getBeanInstance();
}
else {
return beanFactory.getBean(schedulerType);
}
}
@Override
public void postProcessMergedBeanDefinition(RootBeanDefinition beanDefinition, Class<?> beanType, String beanName) {
}
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) {
return bean;
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) {
if (bean instanceof AopInfrastructureBean || bean instanceof TaskScheduler ||
bean instanceof ScheduledExecutorService) {
// Ignore AOP infrastructure such as scoped proxies.
return bean;
}
Class<?> targetClass = AopProxyUtils.ultimateTargetClass(bean);
if (!this.nonAnnotatedClasses.contains(targetClass) &&
AnnotationUtils.isCandidateClass(targetClass, List.of(Scheduled.class, Schedules.class))) {
Map<Method, Set<Scheduled>> annotatedMethods = MethodIntrospector.selectMethods(targetClass,
(MethodIntrospector.MetadataLookup<Set<Scheduled>>) method -> {
Set<Scheduled> scheduledAnnotations = AnnotatedElementUtils.getMergedRepeatableAnnotations(
method, Scheduled.class, Schedules.class);
return (!scheduledAnnotations.isEmpty() ? scheduledAnnotations : null);
});
if (annotatedMethods.isEmpty()) {
this.nonAnnotatedClasses.add(targetClass);
if (logger.isTraceEnabled()) {
logger.trace("No @Scheduled annotations found on bean class: " + targetClass);
}
}
else {
// Non-empty set of methods
annotatedMethods.forEach((method, scheduledAnnotations) ->
scheduledAnnotations.forEach(scheduled -> processScheduled(scheduled, method, bean)));
if (logger.isTraceEnabled()) {
logger.trace(annotatedMethods.size() + " @Scheduled methods processed on bean '" + beanName +
"': " + annotatedMethods);
}
}
}
return bean;
}
/**
* Process the given {@code @Scheduled} method declaration on the given bean.
* @param scheduled the {@code @Scheduled} annotation
* @param method the method that the annotation has been declared on
* @param bean the target bean instance
* @see #createRunnable(Object, Method)
*/
protected void processScheduled(Scheduled scheduled, Method method, Object bean) {
try {
Runnable runnable = createRunnable(bean, method);
boolean processedSchedule = false;
String errorMessage =
"Exactly one of the 'cron', 'fixedDelay(String)', or 'fixedRate(String)' attributes is required";
Set<ScheduledTask> tasks = new LinkedHashSet<>(4);
// Determine initial delay
Duration initialDelay = toDuration(scheduled.initialDelay(), scheduled.timeUnit());
String initialDelayString = scheduled.initialDelayString();
if (StringUtils.hasText(initialDelayString)) {
Assert.isTrue(initialDelay.isNegative(), "Specify 'initialDelay' or 'initialDelayString', not both");
if (this.embeddedValueResolver != null) {
initialDelayString = this.embeddedValueResolver.resolveStringValue(initialDelayString);
}
if (StringUtils.hasLength(initialDelayString)) {
try {
initialDelay = toDuration(initialDelayString, scheduled.timeUnit());
}
catch (RuntimeException ex) {
throw new IllegalArgumentException(
"Invalid initialDelayString value \"" + initialDelayString + "\" - cannot parse into long");
}
}
}
// Check cron expression
String cron = scheduled.cron();
if (StringUtils.hasText(cron)) {
String zone = scheduled.zone();
if (this.embeddedValueResolver != null) {
cron = this.embeddedValueResolver.resolveStringValue(cron);
zone = this.embeddedValueResolver.resolveStringValue(zone);
}
if (StringUtils.hasLength(cron)) {
Assert.isTrue(initialDelay.isNegative(), "'initialDelay' not supported for cron triggers");
processedSchedule = true;
if (!Scheduled.CRON_DISABLED.equals(cron)) {
TimeZone timeZone;
if (StringUtils.hasText(zone)) {
timeZone = StringUtils.parseTimeZoneString(zone);
}
else {
timeZone = TimeZone.getDefault();
}
tasks.add(this.registrar.scheduleCronTask(new CronTask(runnable, new CronTrigger(cron, timeZone))));
}
}
}
// At this point we don't need to differentiate between initial delay set or not anymore
if (initialDelay.isNegative()) {
initialDelay = Duration.ZERO;
}
// Check fixed delay
Duration fixedDelay = toDuration(scheduled.fixedDelay(), scheduled.timeUnit());
if (!fixedDelay.isNegative()) {
Assert.isTrue(!processedSchedule, errorMessage);
processedSchedule = true;
tasks.add(this.registrar.scheduleFixedDelayTask(new FixedDelayTask(runnable, fixedDelay, initialDelay)));
}
String fixedDelayString = scheduled.fixedDelayString();
if (StringUtils.hasText(fixedDelayString)) {
if (this.embeddedValueResolver != null) {
fixedDelayString = this.embeddedValueResolver.resolveStringValue(fixedDelayString);
}
if (StringUtils.hasLength(fixedDelayString)) {
Assert.isTrue(!processedSchedule, errorMessage);
processedSchedule = true;
try {
fixedDelay = toDuration(fixedDelayString, scheduled.timeUnit());
}
catch (RuntimeException ex) {
throw new IllegalArgumentException(
"Invalid fixedDelayString value \"" + fixedDelayString + "\" - cannot parse into long");
}
tasks.add(this.registrar.scheduleFixedDelayTask(new FixedDelayTask(runnable, fixedDelay, initialDelay)));
}
}
// Check fixed rate
Duration fixedRate = toDuration(scheduled.fixedRate(), scheduled.timeUnit());
if (!fixedRate.isNegative()) {
Assert.isTrue(!processedSchedule, errorMessage);
processedSchedule = true;
tasks.add(this.registrar.scheduleFixedRateTask(new FixedRateTask(runnable, fixedRate, initialDelay)));
}
String fixedRateString = scheduled.fixedRateString();
if (StringUtils.hasText(fixedRateString)) {
if (this.embeddedValueResolver != null) {
fixedRateString = this.embeddedValueResolver.resolveStringValue(fixedRateString);
}
if (StringUtils.hasLength(fixedRateString)) {
Assert.isTrue(!processedSchedule, errorMessage);
processedSchedule = true;
try {
fixedRate = toDuration(fixedRateString, scheduled.timeUnit());
}
catch (RuntimeException ex) {
throw new IllegalArgumentException(
"Invalid fixedRateString value \"" + fixedRateString + "\" - cannot parse into long");
}
tasks.add(this.registrar.scheduleFixedRateTask(new FixedRateTask(runnable, fixedRate, initialDelay)));
}
}
// Check whether we had any attribute set
Assert.isTrue(processedSchedule, errorMessage);
// Finally register the scheduled tasks
synchronized (this.scheduledTasks) {
Set<ScheduledTask> regTasks = this.scheduledTasks.computeIfAbsent(bean, key -> new LinkedHashSet<>(4));
regTasks.addAll(tasks);
}
}
catch (IllegalArgumentException ex) {
throw new IllegalStateException(
"Encountered invalid @Scheduled method '" + method.getName() + "': " + ex.getMessage());
}
}
/**
* Create a {@link Runnable} for the given bean instance,
* calling the specified scheduled method.
* <p>The default implementation creates a {@link ScheduledMethodRunnable}.
* @param target the target bean instance
* @param method the scheduled method to call
* @since 5.1
* @see ScheduledMethodRunnable#ScheduledMethodRunnable(Object, Method)
*/
protected Runnable createRunnable(Object target, Method method) {
Assert.isTrue(method.getParameterCount() == 0, "Only no-arg methods may be annotated with @Scheduled");
Method invocableMethod = AopUtils.selectInvocableMethod(method, target.getClass());
return new ScheduledMethodRunnable(target, invocableMethod);
}
private static Duration toDuration(long value, TimeUnit timeUnit) {
return Duration.of(value, timeUnit.toChronoUnit());
}
private static Duration toDuration(String value, TimeUnit timeUnit) {
if (isDurationString(value)) {
return Duration.parse(value);
}
return toDuration(Long.parseLong(value), timeUnit);
}
private static boolean isDurationString(String value) {
return (value.length() > 1 && (isP(value.charAt(0)) || isP(value.charAt(1))));
}
private static boolean isP(char ch) {
return (ch == 'P' || ch == 'p');
}
/**
* Return all currently scheduled tasks, from {@link Scheduled} methods
* as well as from programmatic {@link SchedulingConfigurer} interaction.
* @since 5.0.2
*/
@Override
public Set<ScheduledTask> getScheduledTasks() {
Set<ScheduledTask> result = new LinkedHashSet<>();
synchronized (this.scheduledTasks) {
Collection<Set<ScheduledTask>> allTasks = this.scheduledTasks.values();
for (Set<ScheduledTask> tasks : allTasks) {
result.addAll(tasks);
}
}
result.addAll(this.registrar.getScheduledTasks());
return result;
}
@Override
public void postProcessBeforeDestruction(Object bean, String beanName) {
Set<ScheduledTask> tasks;
synchronized (this.scheduledTasks) {
tasks = this.scheduledTasks.remove(bean);
}
if (tasks != null) {
for (ScheduledTask task : tasks) {
task.cancel();
}
}
}
@Override
public boolean requiresDestruction(Object bean) {
synchronized (this.scheduledTasks) {
return this.scheduledTasks.containsKey(bean);
}
}
@Override
public void destroy() {
synchronized (this.scheduledTasks) {
Collection<Set<ScheduledTask>> allTasks = this.scheduledTasks.values();
for (Set<ScheduledTask> tasks : allTasks) {
for (ScheduledTask task : tasks) {
task.cancel();
}
}
this.scheduledTasks.clear();
}
this.registrar.destroy();
}
static class ScheduledAnnotationsRuntimeHints implements RuntimeHintsRegistrar {
@Override
public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
RuntimeHintsUtils.registerAnnotation(hints, Scheduled.class);
RuntimeHintsUtils.registerAnnotation(hints, Schedules.class);
}
}
}
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