CODEWITHSUNDEEP
springcachingehcache
Urbanleg
Urbanleg

Reputation: 6532

Spring caching - auto update cached setter

I am really new to spring caching.

I saw that spring caching annotations are based mostly on annotating methods.

My question is if i have a dao class that has the following method:

 public User getUserById(long id);

And lets say i cache this method.

and have another dao method (with no annotation) like:

 public void updateUser(User u);

Now imagine this scenario:

1) someone invokes the getUserById(user1Id); //(cache of size 1 now has user1)

2) someone else invokes the updateUser(User1) ; // lets say a simple name change

3) someone else invokes the getUserById(user1Id);

My question :

Assuming no other actions were taken, Will the 3rd invocation receives a deprecated data? (with the old name)?

If so , how to solve this simple use case?

Upvotes: 0

Views: 750

Answers (2)

achingfingers
achingfingers

Reputation: 1916

You need to remove the stale items from cache. The Spring framework helps with several caching related annotations (you could annotate the update-method with @CacheEvict for example). Spring has a good documentation on caching by the way.

Upvotes: 1

Ori Dar
Ori Dar

Reputation: 19020

Yes, the third invocation will return a stale data.

To overcome this, you should trigger a cache eviction after the update operation, by annotating your update method with a @CacheEvict annotation:

@CacheEvict(value = "users", key = "#user.id")
void updateUser(User user) {
    ...
}

Where value = "users" is the same cache name you had used for getUserById() method, and User class has an id property of type Long (which is used as the users cache key)

Upvotes: 2

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