Spring 5.x Source trip thirty-two getBean Detailed seventeen destroy callback

registerDisposableBeanIfNecessary destroy callback

Here on the number of registered destruction callback method, if any.

protected void registerDisposableBeanIfNecessary(String beanName, Object bean, RootBeanDefinition mbd) {
		AccessControlContext acc = (System.getSecurityManager() != null ? getAccessControlContext() : null);
		if (!mbd.isPrototype() && requiresDestruction(bean, mbd)) {//有销毁接口的
			if (mbd.isSingleton()) {//单例的情况，注册销毁回调
				// Register a DisposableBean implementation that performs all destruction
				// work for the given bean: DestructionAwareBeanPostProcessors,
				// DisposableBean interface, custom destroy method.
				registerDisposableBean(beanName,
						new DisposableBeanAdapter(bean, beanName, mbd, getBeanPostProcessors(), acc));
			}
			else {//自定义的，注册到Scope
				// A bean with a custom scope...
				Scope scope = this.scopes.get(mbd.getScope());
				if (scope == null) {
					throw new IllegalStateException("No Scope registered for scope name '" + mbd.getScope() + "'");
				}
				scope.registerDestructionCallback(beanName,
						new DisposableBeanAdapter(bean, beanName, mbd, getBeanPostProcessors(), acc));
			}
		}
	}

requiresDestruction

Check if there are ways the destruction of registration, there is a method name can be, or have DestructionAwareBeanPostProcessorthe processor to judge.

	protected boolean requiresDestruction(Object bean, RootBeanDefinition mbd) {
		return (bean.getClass() != NullBean.class &&
				(DisposableBeanAdapter.hasDestroyMethod(bean, mbd) || (hasDestructionAwareBeanPostProcessors() &&
						DisposableBeanAdapter.hasApplicableProcessors(bean, getBeanPostProcessors()))));
	}

DisposableBeanAdapter of hasDestroyMethod destruction method name

Implement DisposableBeanand AutoCloseablethe interface, or INFER_METHODequal destroyMethodNameand there is close, shutdownmethod name

	public static boolean hasDestroyMethod(Object bean, RootBeanDefinition beanDefinition) {
		if (bean instanceof DisposableBean || bean instanceof AutoCloseable) {
			return true;
		}
		String destroyMethodName = beanDefinition.getDestroyMethodName();
		if (AbstractBeanDefinition.INFER_METHOD.equals(destroyMethodName)) {
			return (ClassUtils.hasMethod(bean.getClass(), CLOSE_METHOD_NAME) ||
					ClassUtils.hasMethod(bean.getClass(), SHUTDOWN_METHOD_NAME));
		}
		return StringUtils.hasLength(destroyMethodName);
	}

DisposableBeanAdapter 的 hasApplicableProcessors

If the processor has to deal with the case.

public static boolean hasApplicableProcessors(Object bean, List<BeanPostProcessor> postProcessors) {
		if (!CollectionUtils.isEmpty(postProcessors)) {
			for (BeanPostProcessor processor : postProcessors) {
				if (processor instanceof DestructionAwareBeanPostProcessor) {
					DestructionAwareBeanPostProcessor dabpp = (DestructionAwareBeanPostProcessor) processor;
					if (dabpp.requiresDestruction(bean)) {
						return true;
					}
				}
			}
		}
		return false;
	}

DefaultSingletonBeanRegistry的registerDisposableBean

In fact, the beanregistration in, to the time the callback on the line.

	public void registerDisposableBean(String beanName, DisposableBean bean) {
		synchronized (this.disposableBeans) {
			this.disposableBeans.put(beanName, bean);
		}
	}

The last time the destruction of the container will be called:

get to be destroyed bean:

callback:

Such basic getBeanprocess has completed, the stresses on some of the details behind something, such as circular dependencies, propagation problems like post-processor.

Well, here today, we hope to help study and understand, do not spray the Great God see, understand only their own learning, limited capacity, please excuse.