Using the Session - Beginning Hibernate: From Novice to Professional - page 191

Figure 8-3. The session's relationship to the caches

In practice, the four production-ready caches, which are already supported, will be ade-
quate for most users (see Table 8-4).

Table 8-4. L2 Cache Implementations Supported by Hibernate Out of the Box

Cache Name Description

EHCache An in-process cache

OSCache

An alternative in-process cache

SwarmCache A multicast distributed cache

TreeCache

A multicast distributed transactional cache

The type of access to the L2 cache can be configured on a per-session basis by selecting
a CacheMode option (see Table 8-5) and applying it with the setCacheMode() method.

Table 8-5. CacheMode Options

Mode Description

NORMAL

Data is read from and written to the cache as necessary.

GET Data is never added to the cache (although cache entries are invalidated when

updated by the session).

PUT

Data is never read from the cache, but cache entries will be updated as they are read
from the database by the session.

REFRESH This is the same as PUT , but the use_minimal_puts Hibernate configuration option

will be ignored if it has been set.

IGNORE Data is never read from or written to the cache (except that cache entries will still be

invalidated when they are updated by the session).

The CacheMode setting does not affect the way in which the L1 cache is accessed.