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DirectoryProvider: storing the index
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DirectoryProvider: storing the index
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Lucene stores its index structure in a Directory. A Directory is an abstract concept that can be materialized in different storage structures. Lucene provides a filesystem Directory as well as a RAM (in-memory) Directory out of the box. This is an extensible system, and you can find various implementations on the internet, including clustered cache directories, a Berkeley database backend, and a JDBC backend. Hibernate Search integrates with the two default backends provided by Lucene. The integration is handled by a directory provider. Before diving into the configuration details for each backend, let s examine how a Lucene directory is associated with an entity.
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Defining a directory provider for an entity
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As you ve seen in section 3.2.1, an entity is marked as indexed thanks to @Indexed. The default index name is the fully qualified class name of the entity class, but you can override this name by using the index attribute. All details concerning a given index are configured through configuration properties. As you ve seen in chapter 2 (section 2.2.2), you can provide properties to Hibernate Search through the following:
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hibernate.properties file hibernate.cfg.xml file if you use Hibernate Core persistence.xml file if you use Hibernate EntityManager Programmatic API (for example, Configuration.setProperty)
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Each index can have specific key value properties defined in the configuration. To define the type of directory provider for an index, use the directory_provider suffix, as demonstrated in Listing 5.1.
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Listing 5.1 Setting the directory provider for a specific index
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hibernate.search.com.manning.hsia.dvdstore.model.Item.directory_provider org.hibernate.search.store.FSDirectoryProvider
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The property name structure is composed of hibernate.search, followed by the index name (the entity s fully qualified class name by default), followed by the configuration suffix. In almost all applications, all indexes will share the same directory provider type. Hibernate Search provides some form of configuration inheritance. All indexes will share properties from the default pool unless a setting is explicitly overridden. Use the default key in lieu of the index name to define global values inherited by indexes unless overridden. In listing 5.2, all indexes share the same directory provider definition, thanks to the hibernate.search.default context, except Item, which overrides the directory_provider value.
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Indexing: where, how, what, and when
Listing 5.2
All indexes except Item use the filesystem directory provider
hibernate.search.default.directory_provider org.hibernate.search.store.FSDirectoryProvider hibernate.search.com.manning.hsia.dvdstore.model.Item.directory_provider org.hibernate.search.store.RAMDirectoryProvider
This mechanism drastically reduces the number of lines of configuration you need to write and is not limited to the directory_provider property. Any property available to a directory provider will be shared as well. Use this opportunity to reduce the configuration settings. If you use sharded indexes (that is, an index split into several small indexes), the configuration might change a bit. Read section 9.4.1 for more information on this topic. Now that you know how to configure the directory provider for an index (or for a set of indexes), let s check the available opportunities.
Using a filesystem directory provider
The default and most useful storage for a Lucene directory is a filesystem (if possible, a local filesystem). Such a model is efficient for several reasons:
The index can be huge, and most of the index structure will remain in the filesystem (as opposed to in memory). Local filesystems are now fast enough to accommodate Lucene s read operations efficiently. Lucene caches information in memory to avoid unnecessary reads to the filesystem. This caching is done at the IndexReader level, and Hibernate Search benefits from it by reusing IndexReader instances as much as possible. A filesystem is the most used and tested solution in Lucene deployments. The index is persistent, and it can easily be backed up and replicated. You can navigate into the index internals thanks to Luke (see section 2.6).
The filesystem storage is the default choice in Hibernate Search: If you don t specify the directory_provider property, org.hibernate.search.store.FSDirectoryProvider is used. Where does Hibernate Search store the index directory It tries to be as smart and intuitive as possible and define names automatically out of the box, but it also lets you override different part of the directory-naming strategy:
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