@Configuration (proxybeanmethods = false) what's the use of setting this to false

Recently Nacos Source code , Find many Configuration On the configuration class   @Configuration(proxyBeanMethods = false)    All the proxyBeanMethods Set up a false 了 . Special research .

  The default in the source code is true, The explanation of this attribute can also be roughly known .

1: If true, It means being @Bean The method of identification will be CGLIB Acting as agent , And will go bean Some behaviors in the life cycle of （ such as ：@PostConstruct,@Destroy etc. spring The life cycle provided in ）, If bean Is a singleton , So in the same configuration Call in

    @Bean Method of identification , No matter how many times you call, you get the same bean, That is to say bean Initialize only once .

2:  If false, Then the identification is @Bean Method of identification , Will not be intercepted for CGLIB agent , And I won't go bean Some behaviors in the life cycle of （ such as ：@PostConstruct,@Destroy etc. spring The life cycle provided in ）, If the same configuration Call in @Bean Method of identification , It's just the execution of ordinary methods , Does not get objects from the container . So if you call @Bean The identified method is a normal method call , And don't go bean Life cycle of .

therefore , If... In the configuration class @Bean If there is no dependent call between the identified methods , It can be set to false, It can avoid proxy operation by intercepting methods , It is also an optimization to improve performance . But we need to pay attention ,@Bean The value of the object will be put into the container , Get from container bean It can still be a single case , Will go through the life cycle .

See the following example ：

public class MyBean {
    @PostConstruct
    public void init(){
        System.out.println("MyBean Initialize the ");
    }
    public void hello(){
        System.out.println("Mybean  hello");
    }
}

public class YourBean {

    public MyBean myBean;

    public YourBean(MyBean myBean){
         this.myBean=myBean;
    }

    @PostConstruct
    public void init(){
        System.out.println("YourBean  Initialize the ");
    }

    public void hello(){
        System.out.println("YourBean hello");
    }
}

@Configuration(proxyBeanMethods=true)

@Configuration(proxyBeanMethods = true)
public class ConfigureTest {
    @Bean
    public OrderEntity getOrderEntity(){
        return new OrderEntity();
    }

    @Bean
    public MyBean myBean(){
        return new MyBean();
    }

    @Bean
    public YourBean yourBean(){
       return new YourBean(myBean());
    }
}

The test method ：

@Component
public class InitClass implements InitializingBean , ApplicationContextAware {

    ApplicationContext applicationContext;

    @Override
    public void afterPropertiesSet() throws Exception {
        YourBean bean = this.applicationContext.getBean(YourBean.class); //  first line 
        YourBean bean1 = this.applicationContext.getBean(YourBean.class);  //  The second line 
        MyBean myBean = this.applicationContext.getBean(MyBean.class);    //  The third line 
        myBean.hello();
        bean.hello();
        bean1.hello();
    }
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext=applicationContext;
    }
}

The first line is finished ：MyBean and YourBean Are initialized , Description in new YourBean（myBean()） in myBean() go bean Life cycle of , Description by CGLIB Acting .

  second , Three lines are finished , There is nothing to output , explain YourBean,MyBean All initialized once .

---

@Configuration(proxyBeanMethods=false)

@Configuration(proxyBeanMethods = false)
public class ConfigureTest {
    @Bean
    public OrderEntity getOrderEntity(){
        return new OrderEntity();
    }

    @Bean
    public MyBean myBean(){
        return new MyBean();
    }

    @Bean
    public YourBean yourBean(){
       return new YourBean(myBean());
    }
}

Finish the first line , Only YourBean Initialization has output ： See what's inside MyBean The attribute is @5351

  Finish the second line , No content output ,bean1 Medium MyBean Properties are also @5351

  The third line is finished ,MyBean Only after the initialization of , And this from the container bean yes @5360

See here should be able to experience ,proxyBeanMethods What do you mean . by false When ,@Bean Marked method calls are ordinary method calls , Will not be represented .