Can I replace a Spring bean definition at runtime?

by

Here is how I have done it in the past: running services which depend on configuration which can be changed on the fly implement a lifecycle interface: IRefreshable:

public interface IRefreshable {
  // Refresh the service having it apply its new values.
  public void refresh(String filter);

  // The service must decide if it wants a cache refresh based on the refresh message filter.
  public boolean requiresRefresh(String filter);
}

Controllers (or services) which can modify a piece of configuration broadcast to a JMS topic that the configuration has changed (supplying the name of the configuration object). A message driven bean then invokes the IRefreshable interface contract on all beans which implement IRefreshable.

The nice thing with spring is that you can automatically detect any service in your application context that needs to be refreshed, removing the need to explicitly configure them:

public class MyCacheSynchService implements InitializingBean, ApplicationContextAware {
 public void afterPropertiesSet() throws Exception {
  Map<String, ?> refreshableServices = m_appCtx.getBeansOfType(IRefreshable.class);
  for (Map.Entry<String, ?> entry : refreshableServices.entrySet() ) {
   Object beanRef = entry.getValue();
   if (beanRef instanceof IRefreshable) {
    m_refreshableServices.add((IRefreshable)beanRef);
   }
  }
 }
}

This approach works particularly well in a clustered application where one of many app servers might change the configuration, which all then need to be aware of. If you want to use JMX as the mechanism for triggering the changes, your JMX bean can then broadcast to the JMS topic when any of its attributes are changed.

More Related Contents:

  1. How to return a custom object from a Spring Data JPA GROUP BY query
  2. Difference between spring @Controller and @RestController annotation
  3. Spring Boot Adding Http Request Interceptors
  4. POSTing a @OneToMany sub-resource association in Spring Data REST
  5. Return generated pdf using spring MVC
  6. Spring boot @ResponseBody doesn’t serialize entity id
  7. How to disable spring security for particular url
  8. Spring – Redirect after POST (even with validation errors)
  9. Can a spring boot @RestController be enabled/disabled using properties?
  10. Binding a list in @RequestParam
  11. Gradle – Could not find or load main class
  12. “NoClassDefFoundError: Could not initialize class” error
  13. How do I obtain the Jackson ObjectMapper in use by Spring 4.1?
  14. How to ignore null values using springframework BeanUtils copyProperties?
  15. Get method arguments using Spring AOP?
  16. How to consume Page response using Spring RestTemplate
  17. When are connections returned to the connection pool with Spring JPA (Hibernate) Entity Manager?
  18. Spring JDBC connection pool best practices
  19. Bind Path variables to a custom model object in spring
  20. Using Spring 3 autowire in a standalone Java application
  21. intellij incorrectly saying no beans of type found for autowired repository
  22. UnsatisfiedDependencyException: Error creating bean with name
  23. Hibernate, spring, JPS & isolation – custom isolation not supported
  24. Spring Data – Multi-column searches
  25. HTTP Status 406. Spring MVC 4.0, jQuery, JSON
  26. java.lang.IllegalStateException: No transactional EntityManager available
  27. Spring application context : access web.xml context-params?
  28. org.openqa.selenium.WebDriverException: Timed out waiting for driver server to start. Build info: version: ‘unknown’, revision: ‘unknown’
  29. Spring – Modifying headers for every request after processing (in postHandle)
  30. Can we declare spring bean conditionally?

Leave a Comment