CODEWITHSUNDEEP
cachingannotationsplayframework-2.0ehcache
alcudia
alcudia

Reputation: 131

play framework cache annotation

Can somebody exlain, with a sample, how works the cache annotation in play framework 2 in java I would like to cache the result of the method with his parameters; something like this:

@Cache(userId, otherParam)
public static  User getUser(int userId, String otherParam){
return a User from dataBase if it isn't in cache.
}

Maybe a tutorial is available?

Thanks for your help.

Upvotes: 3

Views: 1635

Answers (1)

mguillermin
mguillermin

Reputation: 4181

The @Cached annotation doesn't work for every method call. It only works for Actions and moreover, you can't use parameters as a cache key (it's only a static String). If you want to know how it works, look at the play.cache.CachedAction source code.

Instead, you will have to use either Cache.get(), check if result is null and then Cache.set() or the Cache.getOrElse() with a Callable with a code like : 

public static User getUser(int userId, String otherParam){
    return Cache.getOrElse("user-" + userId + "-" + otherParam, new Callable<User>() {
        @Override
        public User call() throws Exception {
            return getUserFromDatabase(userId, otherParam);
        }
    }, DURATION);
}

Be careful when you construct your cache keys to avoid naming-collision as they are shared across the whole application.

Upvotes: 2

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