org.springframework.scheduling.annotation

Class ScheduledAnnotationBeanPostProcessor

java.lang.Object

org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor

All Implemented Interfaces:

java.util.EventListener, Aware, BeanFactoryAware, BeanNameAware, BeanPostProcessor, DestructionAwareBeanPostProcessor, DisposableBean, SmartInitializingSingleton, MergedBeanDefinitionPostProcessor, ApplicationContextAware, ApplicationListener<ContextRefreshedEvent>, EmbeddedValueResolverAware, Ordered, ScheduledTaskHolder

public class ScheduledAnnotationBeanPostProcessor
extends java.lang.Object
implements ScheduledTaskHolder, MergedBeanDefinitionPostProcessor, DestructionAwareBeanPostProcessor, Ordered, EmbeddedValueResolverAware, BeanNameAware, BeanFactoryAware, ApplicationContextAware, SmartInitializingSingleton, ApplicationListener<ContextRefreshedEvent>, DisposableBean

Bean post-processor that registers methods annotated with @Scheduled to be invoked by a TaskScheduler according to the "fixedRate", "fixedDelay", or "cron" expression provided via the annotation.

This post-processor is automatically registered by Spring's <task:annotation-driven> XML element, and also by the @EnableScheduling annotation.

Autodetects any 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 Trigger tasks. See the @EnableScheduling javadocs for complete usage details.

Since:

3.0

Author:

Mark Fisher, Juergen Hoeller, Chris Beams, Elizabeth Chatman

See Also:

Scheduled, EnableScheduling, SchedulingConfigurer, TaskScheduler, ScheduledTaskRegistrar, AsyncAnnotationBeanPostProcessor

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	DEFAULT_TASK_SCHEDULER_BEAN_NAME The default name of the TaskScheduler bean to pick up: "taskScheduler".
protected Log	logger

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Constructor Summary

Constructors

Constructor and Description
ScheduledAnnotationBeanPostProcessor()

Method Summary

Modifier and Type	Method and Description
void	afterSingletonsInstantiated() Invoked right at the end of the singleton pre-instantiation phase, with a guarantee that all regular singleton beans have been created already.
void	destroy() Invoked by a BeanFactory on destruction of a singleton.
int	getOrder() Get the order value of this object.
java.util.Set<ScheduledTask>	getScheduledTasks() Return all currently scheduled tasks, from Scheduled methods as well as from programmatic SchedulingConfigurer interaction.
void	onApplicationEvent(ContextRefreshedEvent event) Handle an application event.
java.lang.Object	postProcessAfterInitialization(java.lang.Object bean, java.lang.String beanName) Apply this BeanPostProcessor to the given new bean instance after any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method).
void	postProcessBeforeDestruction(java.lang.Object bean, java.lang.String beanName) Apply this BeanPostProcessor to the given bean instance before its destruction.
java.lang.Object	postProcessBeforeInitialization(java.lang.Object bean, java.lang.String beanName) Apply this BeanPostProcessor to the given new bean instance before any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method).
void	postProcessMergedBeanDefinition(RootBeanDefinition beanDefinition, java.lang.Class<?> beanType, java.lang.String beanName) Post-process the given merged bean definition for the specified bean.
protected void	processScheduled(Scheduled scheduled, java.lang.reflect.Method method, java.lang.Object bean)
boolean	requiresDestruction(java.lang.Object bean) Determine whether the given bean instance requires destruction by this post-processor.
void	setApplicationContext(ApplicationContext applicationContext) Setting an ApplicationContext is optional: If set, registered tasks will be activated in the ContextRefreshedEvent phase; if not set, it will happen at afterSingletonsInstantiated() time.
void	setBeanFactory(BeanFactory beanFactory) Making a BeanFactory available is optional; if not set, SchedulingConfigurer beans won't get autodetected and a scheduler has to be explicitly configured.
void	setBeanName(java.lang.String beanName) Set the name of the bean in the bean factory that created this bean.
void	setEmbeddedValueResolver(StringValueResolver resolver) Set the StringValueResolver to use for resolving embedded definition values.
void	setScheduler(java.lang.Object scheduler) Set the TaskScheduler that will invoke the scheduled methods, or a ScheduledExecutorService to be wrapped as a TaskScheduler.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_TASK_SCHEDULER_BEAN_NAME

public static final java.lang.String DEFAULT_TASK_SCHEDULER_BEAN_NAME

The default name of the TaskScheduler bean to pick up: "taskScheduler".

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

See Also:

Constant Field Values

logger

protected final Log logger

Constructor Detail

ScheduledAnnotationBeanPostProcessor

public ScheduledAnnotationBeanPostProcessor()

Method Detail

getOrder

public int getOrder()

Description copied from interface: Ordered

Get the order value of this object.

Higher values are interpreted as lower priority. As a consequence, the object with the lowest value has the highest priority (somewhat analogous to Servlet load-on-startup values).

Same order values will result in arbitrary sort positions for the affected objects.

Specified by:

getOrder in interface Ordered

Returns:

the order value

See Also:

Ordered.HIGHEST_PRECEDENCE, Ordered.LOWEST_PRECEDENCE

setScheduler

public void setScheduler(java.lang.Object scheduler)

Set the TaskScheduler that will invoke the scheduled methods, or a ScheduledExecutorService to be wrapped as a TaskScheduler.

If not specified, default scheduler resolution will apply: searching for a unique TaskScheduler bean in the context, or for a TaskScheduler bean named "taskScheduler" otherwise; the same lookup will also be performed for a ScheduledExecutorService bean. If neither of the two is resolvable, a local single-threaded default scheduler will be created within the registrar.

See Also:

DEFAULT_TASK_SCHEDULER_BEAN_NAME

setEmbeddedValueResolver

public void setEmbeddedValueResolver(StringValueResolver resolver)

Description copied from interface: EmbeddedValueResolverAware

Set the StringValueResolver to use for resolving embedded definition values.

Specified by:

setEmbeddedValueResolver in interface EmbeddedValueResolverAware

setBeanName

public void setBeanName(java.lang.String beanName)

Description copied from interface: BeanNameAware

Set the name of the bean in the bean factory that created this bean.

Invoked after population of normal bean properties but before an init callback such as InitializingBean.afterPropertiesSet() or a custom init-method.

Specified by:

setBeanName in interface BeanNameAware

Parameters:

beanName - the name of the bean in the factory. Note that this name is the actual bean name used in the factory, which may differ from the originally specified name: in particular for inner bean names, the actual bean name might have been made unique through appending "#..." suffixes. Use the BeanFactoryUtils.originalBeanName(String) method to extract the original bean name (without suffix), if desired.

setBeanFactory

public void setBeanFactory(BeanFactory beanFactory)

Making a BeanFactory available is optional; if not set, SchedulingConfigurer beans won't get autodetected and a scheduler has to be explicitly configured.

Specified by:

setBeanFactory in interface BeanFactoryAware

Parameters:

beanFactory - owning BeanFactory (never null). The bean can immediately call methods on the factory.

See Also:

BeanInitializationException

setApplicationContext

public void setApplicationContext(ApplicationContext applicationContext)

Setting an ApplicationContext is optional: If set, registered tasks will be activated in the ContextRefreshedEvent phase; if not set, it will happen at afterSingletonsInstantiated() time.

Specified by:

setApplicationContext in interface ApplicationContextAware

Parameters:

applicationContext - the ApplicationContext object to be used by this object

See Also:

BeanInitializationException

afterSingletonsInstantiated

public void afterSingletonsInstantiated()

Description copied from interface: SmartInitializingSingleton

Invoked right at the end of the singleton pre-instantiation phase, with a guarantee that all regular singleton beans have been created already. ListableBeanFactory.getBeansOfType(java.lang.Class<T>) calls within this method won't trigger accidental side effects during bootstrap.

NOTE: This callback won't be triggered for singleton beans lazily initialized on demand after BeanFactory bootstrap, and not for any other bean scope either. Carefully use it for beans with the intended bootstrap semantics only.

Specified by:

afterSingletonsInstantiated in interface SmartInitializingSingleton

onApplicationEvent

public void onApplicationEvent(ContextRefreshedEvent event)

Description copied from interface: ApplicationListener

Handle an application event.

Specified by:

onApplicationEvent in interface ApplicationListener<ContextRefreshedEvent>

Parameters:

event - the event to respond to

postProcessMergedBeanDefinition

public void postProcessMergedBeanDefinition(RootBeanDefinition beanDefinition,
                                            java.lang.Class<?> beanType,
                                            java.lang.String beanName)

Description copied from interface: MergedBeanDefinitionPostProcessor

Post-process the given merged bean definition for the specified bean.

Specified by:

postProcessMergedBeanDefinition in interface MergedBeanDefinitionPostProcessor

Parameters:

beanDefinition - the merged bean definition for the bean

beanType - the actual type of the managed bean instance

beanName - the name of the bean

postProcessBeforeInitialization

public java.lang.Object postProcessBeforeInitialization(java.lang.Object bean,
                                                        java.lang.String beanName)

Description copied from interface: BeanPostProcessor

Apply this BeanPostProcessor to the given new bean instance before any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method). The bean will already be populated with property values. The returned bean instance may be a wrapper around the original.

The default implementation returns the given bean as-is.

Specified by:

postProcessBeforeInitialization in interface BeanPostProcessor

Parameters:

bean - the new bean instance

beanName - the name of the bean

Returns:

the bean instance to use, either the original or a wrapped one; if null, no subsequent BeanPostProcessors will be invoked

See Also:

InitializingBean.afterPropertiesSet()

postProcessAfterInitialization

public java.lang.Object postProcessAfterInitialization(java.lang.Object bean,
                                                       java.lang.String beanName)

Description copied from interface: BeanPostProcessor

Apply this BeanPostProcessor to the given new bean instance after any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method). The bean will already be populated with property values. The returned bean instance may be a wrapper around the original.

In case of a FactoryBean, this callback will be invoked for both the FactoryBean instance and the objects created by the FactoryBean (as of Spring 2.0). The post-processor can decide whether to apply to either the FactoryBean or created objects or both through corresponding bean instanceof FactoryBean checks.

This callback will also be invoked after a short-circuiting triggered by a InstantiationAwareBeanPostProcessor.postProcessBeforeInstantiation(java.lang.Class<?>, java.lang.String) method, in contrast to all other BeanPostProcessor callbacks.

The default implementation returns the given bean as-is.

Specified by:

postProcessAfterInitialization in interface BeanPostProcessor

Parameters:

bean - the new bean instance

beanName - the name of the bean

Returns:

the bean instance to use, either the original or a wrapped one; if null, no subsequent BeanPostProcessors will be invoked

See Also:

InitializingBean.afterPropertiesSet(), FactoryBean

processScheduled

protected void processScheduled(Scheduled scheduled,
                                java.lang.reflect.Method method,
                                java.lang.Object bean)

getScheduledTasks

public java.util.Set<ScheduledTask> getScheduledTasks()

Return all currently scheduled tasks, from Scheduled methods as well as from programmatic SchedulingConfigurer interaction.

Specified by:

getScheduledTasks in interface ScheduledTaskHolder

Since:

5.0.2

postProcessBeforeDestruction

public void postProcessBeforeDestruction(java.lang.Object bean,
                                         java.lang.String beanName)

Description copied from interface: DestructionAwareBeanPostProcessor

Apply this BeanPostProcessor to the given bean instance before its destruction. Can invoke custom destruction callbacks.

Like DisposableBean's destroy and a custom destroy method, this callback just applies to singleton beans in the factory (including inner beans).

Specified by:

postProcessBeforeDestruction in interface DestructionAwareBeanPostProcessor

Parameters:

bean - the bean instance to be destroyed

beanName - the name of the bean

See Also:

DisposableBean, AbstractBeanDefinition.setDestroyMethodName(java.lang.String)

requiresDestruction

public boolean requiresDestruction(java.lang.Object bean)

Description copied from interface: DestructionAwareBeanPostProcessor

Determine whether the given bean instance requires destruction by this post-processor.

NOTE: Even as a late addition, this method has been introduced on DestructionAwareBeanPostProcessor itself instead of on a SmartDABPP subinterface. This allows existing DestructionAwareBeanPostProcessor implementations to easily provide requiresDestruction logic while retaining compatibility with Spring <4.3, and it is also an easier onramp to declaring requiresDestruction as a Java 8 default method in Spring 5.

If an implementation of DestructionAwareBeanPostProcessor does not provide a concrete implementation of this method, Spring's invocation mechanism silently assumes a method returning true (the effective default before 4.3, and the to-be-default in the Java 8 method in Spring 5).

Specified by:

requiresDestruction in interface DestructionAwareBeanPostProcessor

Parameters:

bean - the bean instance to check

Returns:

true if DestructionAwareBeanPostProcessor.postProcessBeforeDestruction(java.lang.Object, java.lang.String) is supposed to be called for this bean instance eventually, or false if not needed

destroy

public void destroy()

Description copied from interface: DisposableBean

Invoked by a BeanFactory on destruction of a singleton.

Specified by:

destroy in interface DisposableBean