Spring源码

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注册bean信息（BeanDefinition）到Ioc容器中，

DefaultListableBeanFactory.class文件

   public void registerBeanDefinition(String beanName, BeanDefinition beanDefinition)
           throws BeanDefinitionStoreException {

       Assert.hasText(beanName, "Bean name must not be empty");
       Assert.notNull(beanDefinition, "BeanDefinition must not be null");

       if (beanDefinition instanceof AbstractBeanDefinition) {
           try {
               ((AbstractBeanDefinition) beanDefinition).validate();
           }
           catch (BeanDefinitionValidationException ex) {
               throw new BeanDefinitionStoreException(beanDefinition.getResourceDescription(), beanName,
                       "Validation of bean definition failed", ex);
           }
       }

       synchronized (this.beanDefinitionMap) {
           Object oldBeanDefinition = this.beanDefinitionMap.get(beanName);
           if (oldBeanDefinition != null) {
               if (!this.allowBeanDefinitionOverriding) {
                   throw new BeanDefinitionStoreException(beanDefinition.getResourceDescription(), beanName,
                           "Cannot register bean definition [" + beanDefinition + "] for bean '" + beanName +
                           "': There is already [" + oldBeanDefinition + "] bound.");
               }
               else {
                   if (this.logger.isInfoEnabled()) {
                       this.logger.info("Overriding bean definition for bean '" + beanName +
                               "': replacing [" + oldBeanDefinition + "] with [" + beanDefinition + "]");
                   }
               }
           }
           else {
               this.beanDefinitionNames.add(beanName);
               this.frozenBeanDefinitionNames = null;
           }
           this.beanDefinitionMap.put(beanName, beanDefinition);

           resetBeanDefinition(beanName);
       }
   }

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