Controlling concurrent user access

Concurrent access control can also be feasible in AOP since we can improvise the authentication process through the @Aspect interception. If aspects can communicate with each other through session attributes, we can utilize the existing session of the application to count the number of user accesses per account.

Getting started

Update LoginAuthAspect in order to manage the number of allowable user access privileges an account can utilize.

How to do it...

Without using Spring Security, let us simulate concurrent user control by using AOP and following these steps:

1. Create a @Bean of Map type that will hold all usernames that are currently logged in to the application. Inject this Map in SpringContextConfig:

Configuration 
@EnableWebMvc 
@EnableAspectJAutoProxy 
@ComponentScan(basePackages="org.packt.aop.transaction") 
public class SpringContextConfig { 
   
  @Bean 
  public Map<String,Integer> authStore(){ 
    return new HashMap<>(); 
  } 
} 

2. Update...