Ensure single instance of a spring managed bean

Question

I have created a spring aspect to handle Retry mechanism. I have also created a Retry annotation. Following is the code for Retry annotation and an aspect which processes th

Answer 1

I found a way to do this :) Ref: Going Beyond DI I registered a BeanDefinitionRegistryPostProcessor in my root context, this will ensure that there is only one BeanDefinition of my desired class.

package test;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;

import com.xx.xx.xx.xx.xx.RetryInterceptor;

public class TestBeanFacotryPostProcessor implements BeanDefinitionRegistryPostProcessor {

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
    }

    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
        String[] definitionNames = registry.getBeanDefinitionNames();
        for (int i = 0, j = 0; i < definitionNames.length; i++) {
            Class clazz;
            try {
                clazz = Class.forName(registry.getBeanDefinition(definitionNames[i]).getBeanClassName());
                if (RetryInterceptor.class == clazz && j++ > 0) {
                    registry.removeBeanDefinition(definitionNames[i]);
                }
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
        }
    }
}