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The usage attribute specifies the caching concurrency strategy used by the underlying caching service. The previous configuration sets the usage to read-write, which is desirable if your application needs to update data. Alternatively, you may use the nonstrict-read-write strategy if it s unlikely two separate transaction threads could update the same object. If a persistent object is never updated, only read from the database, you may specify set usage to read-only. Some caching services, such as the JBoss TreeCache, use transactions to batch multiple operations and perform the batch as a single unit of work. If you choose to use a transactional cache, you may set the usage attribute to transactional to take advantage of this feature. If you happen to be using a transactional cache, you ll also need to set the transaction.manager_lookup_class mentioned in the previous section. The supported caching strategies differ based on the service used. Table 3.3 shows the supported strategies.
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Table 3.3 Supported caching service strategies Caching Service EHCache OSCache SwarmCache TreeCache Read-only Y Y Y Y Read-write Y Y Y N Nonstrictread-write Y Y Y N Transactional N N N Y
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Clearly, the caching service you choose will depend on your application requirements and environment. Next, let s look at configuring EHCache.
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Configuring EHCache
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By now you re probably tired of reading about configuring Hibernate, but EHCache is pretty simple. It s a single XML file, placed in a directory listed in your classpath. You ll probably want to put the ehcache.xml file in the same directory as the hibernate.cfg.xml file.
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Hibernate basics
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Listing 3.5 shows a simple configuration file for EHCache. Listing 3.5 ehcache.xml file
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<ehcache> <diskStore path="java.io.tmp"/> <defaultCache maxElementsInMemory="10" eternal="false" timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true"/> <cache name="com.manning.hq.ch03.Event" maxElementsInMemory="20" eternal="false" timeToIdleSeconds="120" timeToLiveSeconds="180" overflowToDisk="true"/> </ehcache>
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In this example, the diskStore property sets the location of the disk cache store. Then, the listing declares two caches. The defaultCache element contains the settings for all cached objects that don t have a specific cache element: the number of cached objects held in memory, whether objects in the cache expire (if eternal is true, then objects don t expire), the number of seconds an object should remain the cache after it was last accessed, the number of seconds an object should remain in the cache after it was created, and whether objects exceeding maxElementsInMemory should be spooled to the diskStore. Next, for custom settings based on the class, the code defines a cache element with the fully qualified class name listed in the name attribute. (This listing only demonstrates a subset of the available configuration for EHCache. Please refer to the documentation found at http:// ehcache.sf.net for more information.) With pooling, transactions, and caching behind us, we can look at a difference topic: how Hibernate handles inheritance.
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Inheritance
3.8 Inheritance
Inheritance is a fundamental concept of object-oriented languages. Through inheritance, objects can inherit the state and behavior of their ancestor, or superclass. The most common use of object inheritance in applications is to create a generic base type with one or more specialized subclasses. Persisting a class hierarchy can be difficult, since each hierarchy can have its own unique requirements. To address the problems found in hierarchy persistence, Hibernate supports three different inheritance persistence strategies: Table per class hierarchy Table per subclass Table per concrete class Each mapping strategy is incrementally more complicated. In the following sections, we ll discuss the first two inheritance strategies. We ve never needed to use the third, and most complicated, strategy.
3.8.1 Table per class hierarchy
This strategy is the most basic and easiest to use. All the classes in the hierarchy are stored in a single table. Suppose you have the base Event class, with ConferenceEvent and NetworkingEvent as subclasses. The mapping definition for this hierarchy is shown in listing 3.6. Listing 3.6 Table per class hierarchy mapping
<class name="Event" table="events" discriminator-value="EVENT"> <id name="id" type="long"> <generator class="native"/> </id> <discriminator column="event_type" type="string" length="15"/> ... <subclass name="ConferenceEvent" discriminatorvalue="CONF_EVENT"> <property name="numberOfSeats" column="num_seats"/> ...
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