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The region name of the collection cache is the fully qualified class name plus the collection property name, auction.model.Category.items. The @org.hibernate.annotations.Cache annotation can also be declared on a collection field or getter method. This cache setting is effective when you call aCategory.getItems() in other words, a collection cache is a region that contains which items are in which category. It s a cache of identifiers only; there is no actual Category or Item data in that region. If you require the Item instances themselves to be cached, you must enable caching of the Item class. A read-write strategy is especially appropriate. Your users don t want to make decisions (placing a bid, for example) based on possibly stale Item data. Let s go a step further and consider the collection of bids: A particular Bid in the bids collection is immutable, but the collection of bids is mutable, and concurrent units of work need to see any addition or removal of a collection element without delay:

The following Java compilation with Ant, utilizing Ant s datatypes and properties, shows the equivalent Ant task declaration in our build file. 50

You apply a read-only strategy for the Bid class:

This chapter has covered several odds and ends with respect to Ant extensibility. While these techniques are not normally needed in the majority of builds, they are each quite powerful and handy when the situations arise for their use. Scripting using any of the Bean Scripting Framework supported languages allows ad-hoc task writing within an Ant build file, without the need to write, compile, and

and never updated. (Bids may of course be expired by the cache provider for example, if the maximum number of objects in the cache is reached.) Hibernate also removes the data from the cache if a Bid instance is deleted, but it doesn t provide any transactional guarantees in doing so. User is an example of a class that could be cached with the nonstrict-read-write strategy, but we aren t certain that it makes sense to cache users. Let s set the cache provider, its expiration policies, and the physical regions of your cache. You use cache regions to configure class and collection caching individually.

Hibernate keeps different classes/collections in different cache regions. A region is a named cache: a handle by which you may reference classes and collections in the cache provider configuration and set the expiration policies applicable to that region. A more graphical description is that regions are buckets of data, of which there are two types: One type of region contains the disassembled data of entity instances, and the other type contains only identifiers of entities that are linked through a collection. The name of the region is the class name in the case of a class cache, or the class name together with the property name in the case of a collection cache. Category instances are cached in a region named auction.model.Category, whereas the items collection is cached in a region named auction.model.Category.items. The Hibernate configuration property named hibernate.cache.region_prefix may be used to specify a region name prefix for a particular SessionFactory or persistence unit. For example, if the prefix is set to db1, Category is cached in

package custom Java tasks It is not nearly as powerful or robust as using custom Java tasks, and there are several reasons why using <script> is not preferred Writing script tasks can be a useful prototyping method before converting to Java tasks, or can automate controlling other tasks and targets in bizarre and fun ways Build listeners and loggers are the key to IDE and external integration with Ant, and custom-writing them is easy Ant comes with several listeners and loggers already, which are detailed in Ant s documentation Familiarize yourself with these before embarking on custom development Pay particular attention to the Log4j and Jakarta Commons Logging listeners, which are highly configurable and will meet most custom listening needs already Developing custom mappers and selectors provides extensibility in how Ant processes sets of files.

a region named db1.auction.model.Category. This setting is necessary if your application works with multiple SessionFactory instances or persistence units. Without it, cache region names of different persistence units may conflict. Now that you know about cache regions, you can configure the physical properties of the auction.model.Category cache. First let s choose a cache provider. Suppose you re running your auction application in a single JVM, so you don t need a cluster-aware provider.