关于spring ioc容器的问题
在spring的源代码中,有org.springframework.beans.factory.support.BeanDefinitionValueResolver这么个类.
在该类中有private Object resolveReference(String argName, RuntimeBeanReference ref)这样1个方法.
源代码如下:
private Object resolveReference(String argName, RuntimeBeanReference ref) { if (this.beanFactory.logger.isTraceEnabled()) { this.beanFactory.logger.trace("Resolving reference from property " + argName + " in bean '" + this.beanName + "' to bean '" + ref.getBeanName() + "'"); } try { if (ref.isToParent()) { if (this.beanFactory.getParentBeanFactory() == null) { throw new BeanCreationException( this.beanDefinition.getResourceDescription(), this.beanName, "Can't resolve reference to bean '" + ref.getBeanName() + "' in parent factory: no parent factory available"); } return this.beanFactory.getParentBeanFactory().getBean(ref.getBeanName()); } else { Object bean = this.beanFactory.getBean(ref.getBeanName()); if (this.beanDefinition.isSingleton()) { this.beanFactory.registerDependentBean(ref.getBeanName(), this.beanName); } return bean; } } catch (BeansException ex) { throw new BeanCreationException( this.beanDefinition.getResourceDescription(), this.beanName, "Cannot resolve reference to bean '" + ref.getBeanName() + "' while setting " + argName, ex); } } private Object resolveReference(String argName, RuntimeBeanReference ref) {if (this.beanFactory.logger.isTraceEnabled()) {this.beanFactory.logger.trace("Resolving reference from property " + argName + " in bean '" +this.beanName + "' to bean '" + ref.getBeanName() + "'");}try {if (ref.isToParent()) {if (this.beanFactory.getParentBeanFactory() == null) {throw new BeanCreationException(this.beanDefinition.getResourceDescription(), this.beanName,"Can't resolve reference to bean '" + ref.getBeanName() +"' in parent factory: no parent factory available");}return this.beanFactory.getParentBeanFactory().getBean(ref.getBeanName());}else {Object bean = this.beanFactory.getBean(ref.getBeanName());if (this.beanDefinition.isSingleton()) {this.beanFactory.registerDependentBean(ref.getBeanName(), this.beanName);}return bean;}}catch (BeansException ex) {throw new BeanCreationException(this.beanDefinition.getResourceDescription(), this.beanName,"Cannot resolve reference to bean '" + ref.getBeanName() + "' while setting " + argName, ex);}}