Spring source code about PostProcessorRegistrationDelegate?

< H2 > Spring source code about PostProcessorRegistrationDelegate? < / H2 >

Spring4.0 and above about 

PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors()
A question of

:

in this method, we can see that it calls the following method several times: 

postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false)

even called the method in the loop: 

while (reiterate) {
                reiterate = false;
                postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
                for (String ppName : postProcessorNames) {
                    if (!processedBeans.contains(ppName)) {
                        currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
                        processedBeans.add(ppName);
                        reiterate = true;
                    }
                }
                sortPostProcessors(currentRegistryProcessors, beanFactory);
                registryProcessors.addAll(currentRegistryProcessors);
                invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
                currentRegistryProcessors.clear();
            }

my guess is that it is possible to call 

postProcessor.postProcessBeanDefinitionRegistry(registry);
The

method will lead to changes in the relevant bean definition in beanFactory, so it has been called many times. I don"t know how you understand it. Thank you.

Java spring
Aug.11,2021

it seems that the logic of this cycle is like this: BeanDefinitionRegistryPostProcessor's postProcessBeanDefinitionRegistry is originally used to operate BeanDefinition, but this is not the reason for the loop here. I am worried about the self-defined postProcessBeanDefinitionRegistry object, and when I execute the invokeBeanDefinitionRegistryPostProcessors method, I register some objects like BeanDefinitionRegistryPostProcessor, which can be done through registry.registerBeanDefinition (), which means something recursive. The above belongs to my opinion. The example of BeanDefinitionRegistryPostProcessor is to carry out additional processing before instantiating bean, which can achieve the effect of transferring flowers and trees.

Previous: Verify repeatability with multiple input in Angular

Next: How does the {_ _ ob__: Observer} object in vue get the length?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e4bc27-43937.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4bc27-43937.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?