org.springframework.context.support

Class ApplicationListenerDetector

java.lang.Object

org.springframework.context.support.ApplicationListenerDetector

All Implemented Interfaces:

BeanPostProcessor, DestructionAwareBeanPostProcessor, MergedBeanDefinitionPostProcessor

class ApplicationListenerDetector
extends java.lang.Object
implements DestructionAwareBeanPostProcessor, MergedBeanDefinitionPostProcessor

BeanPostProcessor that detects beans which implement the ApplicationListener interface. This catches beans that can't reliably be detected by getBeanNamesForType and related operations which only work against top-level beans.

With standard Java serialization, this post-processor won't get serialized as part of DisposableBeanAdapter to begin with. However, with alternative serialization mechanisms, DisposableBeanAdapter.writeReplace might not get used at all, so we defensively mark this post-processor's field state as transient.

Since:

4.3.4

Author:

Juergen Hoeller

Field Summary

Fields

Modifier and Type	Field and Description
private AbstractApplicationContext	applicationContext
private static Log	logger
private java.util.Map<java.lang.String,java.lang.Boolean>	singletonNames

Constructor Summary

Constructors

Constructor and Description
ApplicationListenerDetector(AbstractApplicationContext applicationContext)

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object other)
int	hashCode()
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.
boolean	requiresDestruction(java.lang.Object bean) Determine whether the given bean instance requires destruction by this post-processor.

Methods inherited from class java.lang.Object

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

Field Detail

logger

private static final Log logger

applicationContext

private final transient AbstractApplicationContext applicationContext

singletonNames

private final transient java.util.Map<java.lang.String,java.lang.Boolean> singletonNames

Constructor Detail

ApplicationListenerDetector

public ApplicationListenerDetector(AbstractApplicationContext applicationContext)

Method Detail

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

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

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object