How to avoid same query execution multiple times?

Question

I need an approach through which I can avoid same query execution multiple times. I dont need any help from the code perspective. A high level approach will be fine.

Currently I am executing same hibernate query in different classes and these executions are part of same request. As of now I am using a request level cache to store the data. Later I am fetching those data from cache instead of DB to improve performance. But I want to know if there is any other approach which I can follow apart from above approach.

It will be very helpful if you can help on this.

Thanks

Answer 1

You can register a web listener which will implement ServletContextListener . You will need to implement contextInitialized (application deploy) and contextDestroyed (application undeploy).

@WebListener
public final class CacheBootstrap implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent sce) {
       // load data into cache (hql?)
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
       // unload data from cache (hql?)
    }
}