How to change a EhCache members expiry time progra

问题:

I would like to change the expiry or set the expiry time of a member of an EhCache via Java code.

I know when the object should expire, but I'm unsure how to achieve this.

I know I can set it for the whole cache, e.g.

Cache cache = manager.getCache("sampleCache");
CacheConfiguration config = cache.getCacheConfiguration();
config.setTimeToIdleSeconds(60);
config.setTimeToLiveSeconds(120);
config.setMaxEntriesLocalHeap(10000);
config.setMaxEntriesLocalDisk(1000000);

Can someone suggest how I do this for a specific member?

回答1:

In Ehcache 2.x, you can set expiry time on the Element you insert in the cache:

Element element = new Element("key1", "value1");
element.setTimeToLive(300);

In Ehcache 3.x, you can implement a custom Expiry and have it return different Duration depending on the key and value:

public interface Expiry<K, V> {
  Duration getExpiryForCreation(K key, V value);
  Duration getExpiryForAccess(K key, ValueSupplier<? extends V> value);
  Duration getExpiryForUpdate(K key, ValueSupplier<? extends V> oldValue, V newValue);
}

Check the API documentation for more information.