Spring-IOC bean 创建过程中的 ObjectFactory

// Create bean instance.

if (mbd.isSingleton()) {

	sharedInstance = getSingleton(beanName, new ObjectFactory<Object>() {

		@Override

		public Object getObject() throws BeansException {

		    try {

			    return createBean(beanName, mbd, args);

			}

		    catch (BeansException ex) {

			// Explicitly remove instance from singleton cache: It might have been put there

			// eagerly by the creation process, to allow for circular reference resolution.

			// Also remove any beans that received a temporary reference to the bean.

			destroySingleton(beanName);

			throw ex;

		    }

	    }

        });

	bean = getObjectForBeanInstance(sharedInstance, name, beanName, mbd);

}

ObjectFactory是一个普通的对象工厂接口。在AbstractBeanFacotry的doGetBean部分的源码中,可以看到spring对ObjectFactory的应用之一就是，

将创建对象的步骤封装到ObjectFactory中 交给自定义的Scope来选择是否需要创建对象来灵活的实现Scope。

ObjectFactory

详情： https://blog.csdn.net/u012291108/article/details/51886269