Spring 5.x Source trip thirty-one getBean Detailed sixteen initializeBean two

invokeInitMethods

Speaking in front of an initialization process before making continues today.
If this method is that we achieve the InitializingBeaninterface, then it may have to call the afterPropertiesSetmethod, in fact, it is a callback to tell you attribute set up. Of course, there are ways to customize initialization later invokeCustomInitMethod.

protected void invokeInitMethods(String beanName, final Object bean, @Nullable RootBeanDefinition mbd)
			throws Throwable {
		//实现InitializingBean接口的
		boolean isInitializingBean = (bean instanceof InitializingBean);
		if (isInitializingBean && (mbd == null || !mbd.isExternallyManagedInitMethod("afterPropertiesSet"))) {
			if (logger.isTraceEnabled()) {
				logger.trace("Invoking afterPropertiesSet() on bean with name '" + beanName + "'");
			}
			if (System.getSecurityManager() != null) {
				try {
					AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () -> {
						((InitializingBean) bean).afterPropertiesSet();
						return null;
					}, getAccessControlContext());
				}
				catch (PrivilegedActionException pae) {
					throw pae.getException();
				}
			}
			else {
				((InitializingBean) bean).afterPropertiesSet();
			}
		}
		//初始化方法，比如xml配置的
		if (mbd != null && bean.getClass() != NullBean.class) {
			String initMethodName = mbd.getInitMethodName();
			if (StringUtils.hasLength(initMethodName) &&
					!(isInitializingBean && "afterPropertiesSet".equals(initMethodName)) &&
					!mbd.isExternallyManagedInitMethod(initMethodName)) {
				invokeCustomInitMethod(beanName, bean, mbd);
			}
		}
	}

The initial method of custom invokeCustomInitMethod

Get beancustom initialization method, if the parent class is the interface itself or type, then it is reflected off of the interface method, the last call.

protected void invokeCustomInitMethod(String beanName, final Object bean, RootBeanDefinition mbd)
			throws Throwable {

		String initMethodName = mbd.getInitMethodName();
		Assert.state(initMethodName != null, "No init method set");
		Method initMethod = (mbd.isNonPublicAccessAllowed() ?
				BeanUtils.findMethod(bean.getClass(), initMethodName) :
				ClassUtils.getMethodIfAvailable(bean.getClass(), initMethodName));

		if (initMethod == null) {
			if (mbd.isEnforceInitMethod()) {
				throw new BeanDefinitionValidationException("Could not find an init method named '" +
						initMethodName + "' on bean with name '" + beanName + "'");
			}
			else {
				if (logger.isTraceEnabled()) {
					logger.trace("No default init method named '" + initMethodName +
							"' found on bean with name '" + beanName + "'");
				}
				// Ignore non-existent default lifecycle methods.
				return;
			}
		}

		if (logger.isTraceEnabled()) {
			logger.trace("Invoking init method  '" + initMethodName + "' on bean with name '" + beanName + "'");
		}
		Method methodToInvoke = ClassUtils.getInterfaceMethodIfPossible(initMethod);

		if (System.getSecurityManager() != null) {
			AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
				ReflectionUtils.makeAccessible(methodToInvoke);
				return null;
			});
			try {
				AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () ->
						methodToInvoke.invoke(bean), getAccessControlContext());
			}
			catch (PrivilegedActionException pae) {
				InvocationTargetException ex = (InvocationTargetException) pae.getException();
				throw ex.getTargetException();
			}
		}
		else {
			try {
				ReflectionUtils.makeAccessible(methodToInvoke);
				methodToInvoke.invoke(bean);
			}
			catch (InvocationTargetException ex) {
				throw ex.getTargetException();
			}
		}
	}

getInterfaceMethodIfPossible try to obtain an interface method

The method attempts to obtain the interface itself, or from a parent class.

public static Method getInterfaceMethodIfPossible(Method method) {
		if (Modifier.isPublic(method.getModifiers()) && !method.getDeclaringClass().isInterface()) {
			Class<?> current = method.getDeclaringClass();
			while (current != null && current != Object.class) {
				Class<?>[] ifcs = current.getInterfaces();
				for (Class<?> ifc : ifcs) {
					try {
						return ifc.getMethod(method.getName(), method.getParameterTypes());
					}
					catch (NoSuchMethodException ex) {
						// ignore
					}
				}
				current = current.getSuperclass();
			}
		}
		return method;
	}

After the initialization process applyBeanPostProcessorsAfterInitialization

With almost before the initialization process.

	@Override
	public Object applyBeanPostProcessorsAfterInitialization(Object existingBean, String beanName)
			throws BeansException {

		Object result = existingBean;
		for (BeanPostProcessor processor : getBeanPostProcessors()) {
			Object current = processor.postProcessAfterInitialization(result, beanName);
			if (current == null) {
				return result;
			}
			result = current;
		}
		return result;
	}

PostProcessorRegistrationDelegate inner class of postProcessAfterInitialization BeanPostProcessorChecker

Not shriveled, it is to print information.

		@Override
		public Object postProcessAfterInitialization(Object bean, String beanName) {
			if (!(bean instanceof BeanPostProcessor) && !isInfrastructureBean(beanName) &&
					this.beanFactory.getBeanPostProcessorCount() < this.beanPostProcessorTargetCount) {
				if (logger.isInfoEnabled()) {
					logger.info("Bean '" + beanName + "' of type [" + bean.getClass().getName() +
							"] is not eligible for getting processed by all BeanPostProcessors " +
							"(for example: not eligible for auto-proxying)");
				}
			}
			return bean;
		}

ApplicationListenerDetector的postProcessAfterInitialization

The singleton class our custom to add as a listener applicationEventMulticasterin.

@Override
	public Object postProcessAfterInitialization(Object bean, String beanName) {
		if (bean instanceof ApplicationListener) {
			// potentially not detected as a listener by getBeanNamesForType retrieval
			Boolean flag = this.singletonNames.get(beanName);
			if (Boolean.TRUE.equals(flag)) {
				// singleton bean (top-level or inner): register on the fly
				this.applicationContext.addApplicationListener((ApplicationListener<?>) bean);
			}
			else if (Boolean.FALSE.equals(flag)) {
				if (logger.isWarnEnabled() && !this.applicationContext.containsBean(beanName)) {
					// inner bean with other scope - can't reliably process events
					logger.warn("Inner bean '" + beanName + "' implements ApplicationListener interface " +
							"but is not reachable for event multicasting by its containing ApplicationContext " +
							"because it does not have singleton scope. Only top-level listener beans are allowed " +
							"to be of non-singleton scope.");
				}
				this.singletonNames.remove(beanName);
			}
		}
		return bean;
	}

At this point initialization basically completed.

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.