Cache invalidation in Ehcache

Question

I am using Ehcache in Hibernate.

How can I notify the cache that the database has changed? How can I invalidate the cached data? How can I programmatically achieve t

Answer 1

Try:

CacheManager.create().clearAll()

It will clear all caches in CacheManager.

To clear only one particular cache, get it from cache manager and remove all elements:

CacheManager cacheManager = CacheManager.create();
Ehcache cache = cacheManager.getEhcache(cacheConfiguration.getName());
cache.removeAll();    

Answer 2

This is how you can invalidate all EhCache items without bothering what the individual cache names are:

CacheManager manager = CacheManager.getInstance();

String[] names = manager.getCacheNames();

for (String name : names)
{
    Cache cache = manager.getCache(name);

    cache.removeAll();
}

Answer 3

In case if you want to remove a specific cache (eg:employeeCache)

@Autowired
CacheManager cacheManager;

place where you want to invalidate cache, use below code

    Cache cache = cacheManager.getCache("employeeCache");
    cache.removeAll();

Answer 4

What do exactly mean? There are 2 ways to make a change in the database: inside the app & outside the app

Inside the app you can trigger easily an invalidation. The second one is a harder to solve. Cache elements are stored with a key and based on that key you can delete it.

CacheManager manager = CacheManager.getInstance();
cache = manager.getCache(cacheName);
cache.remove(key);

or 

cache.removeAll();

Depending how you configured ehcache of course. But you need to know the name of the cache that holds the object.

Answer 5

Set cache expiration so data is refreshed as or more often than the database changes .

Also you can update in cache only elements that change in the database .