在运行时重新加载 spring bean

Question

I am trying to change bean property value during the runtime.

WebConfig

@Configuration
public class WebConfig extends WebMvcConfigurationSupport {

    @Autowired
    private SecurityService service;

    @Bean
    public SecurityPolicy securityPolicy() {
        SecurityPolicy policy = new SecurityPolicy();

        //takes data from db, it works fine
        policy.setMaxAttempt = service.getMaxAttempts();
        return policy;
    }
}

Controller

@Controller
public class SecurityPolicyController {

    @Autowired
    private SecurityPolicy policy;

    @Autowired
    private ApplicationContext context;

    @Autowired
    private SecurityService service;

    @RequestMapping(value = "/security")
    public ModelAndView update() {

        ModelAndView model = new ModelAndView(); 

        //set data to db, it works fine aswell
        service.setMaxAttempts(7);

        //now i am trying to reload my beans
        ((ConfigurableApplicationContext)context).refresh();

        //something reloading but i still get the same value
        System.out.println(policy.getMaxLoginAttempts());
        model.setViewName("security"); 
        return model;

    }
}

Changing the value occurs only when the server is rebooted. Can you suggest example how to achieve bean reloading during the runtime or tell what I'm doing wrong? All help appreciated

Answer 1

why not inject the service into policy ? and everytime you call the policy.getMaxLoginAttempts() the call gets delegated to service.getMaxAttempts() . So you get new values returned, without having to reload.

So the config looks like this:

@Bean
public SecurityPolicy securityPolicy() {
    return new SecurityPolicy(service);
}

And the SecurityPolicy.getMaxLoginAttempts() like this:

public int getMaxLoginAttempts(){
    return service.getMaxAttempts();
}