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Setting up Hibernate Search
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Listing 2.3
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Hibernate Search configuration hibernate.properties file Define your Hibernate
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Core properties #regular Hibernate Core configuration hibernate.dialect org.hibernate.dialect.PostgreSQLDialect hibernate.connection.datasource jdbc/test specific properties #Hibernate Search configuration hibernate.search.default.indexBase /users/application/indexes
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Define Hibernate Search-
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hibernate.cfg.xml file < xml version="1.0" encoding="UTF-8" > <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
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<!-- hibernate.cfg.xml --> <hibernate-configuration> <session-factory name="dvdstore-catalog"> <!-- regular Hibernate Core configuration --> <property name="hibernate.dialect"> org.hibernate.dialect.PostgreSQLDialect </property> <property name="hibernate.connection.datasource"> jdbc/test </property> Hibernate Search
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properties <!-- Hibernate Search configuration --> <property name="hibernate.search.default.indexBase"> /users/application/indexes </property> List your entities
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<!-- mapping classes --> <mapping class="com.manning.dvdstore.model.Item"/> </session-factory> </hibernate-configuration>
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META-INF/persistence.xml
< xml version="1.0" encoding="UTF-8" > <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> <!-- example of a default persistence.xml --> <persistence-unit name="dvdstore-catalog"> <jta-data-source>jdbc/test</jta-data-source> <properties> <!-- regular Hibernate Core configuration --> <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/> <!-- Hibernate Search configuration -->
Getting started with Hibernate Search
<property name="hibernate.search.default.indexBase" value="/users/application/indexes"/> </properties> </persistence-unit> </persistence>
Hibernate Search properties
This is the last time you ll see the XML headers (doctype and schema) in this book. They should always be there, but for conciseness we ll drop them in future examples. This is the only configuration property we need to set to get started with Hibernate Search. Even this property is defaulted to ./, which is the JVM current directory, but the authors think it s more appropriate to explicitly define the target directory. Another property can be quite useful, especially in test environments: the Lucene directory provider. Hibernate Search stores your indexes in a file directory by default. But it can be quite convenient to store indexes only in memory when doing unit tests, especially if, like the authors, you prefer to use in-memory databases like HSQLDB, H2, or Derby to run your test suite. It makes the tests run faster and limits side effects between tests. We ll discuss this approach in section 5.1.3 and section 9.5.2.
NOTE
IN-MEMORY INDEX AND UNIT TESTING
We d like to warn you of a classic error we re sure you ll be bitten by that can cost you a few hours until you figure it out. When you run a test on your index, make sure it is on par with the database you re testing on. Classically, unit tests clear the database and add a fresh set of data. Every so often you ll forget to update or clear your file system s Lucene directory. Your results will look confusing, returning duplicate or stale data. One elegant way to avoid that is to use in-memory directories; they re created and destroyed for every test, practically isolating them from one another.
As you can see, configuring Hibernate Search is very simple, and the required parameters are minimal. Well, it s not entirely true we lied to you. If your system uses Hibernate Annotations 3.3.x and beyond, these are truly the only parameters required. But if your system uses Hibernate Core only, a few additional properties are required.
NOTE
HOW DO I KNOW WHETHER TO USE HIBERNATE ANNOTATIONS OR SIMPLY HIBERNATE CORE There are three very simple rules:
If your domain model uses Hibernate Annotations or Java Persistence annotations, you re using Hibernate Annotations. If your application uses the Hibernate EntityManager API (the Java Persistence API really), you re also using Hibernate Annotations under the cover. If you re still unsure, check whether you create a Configuration object or an AnnotationConfiguration object. In the former case, you re using Hibernate Core. In the latter case, you re using Hibernate Annotations.
Setting up Hibernate Search
Why is that Hibernate Annotations detects Hibernate Search and is able to autowire Hibernate event listeners for you. Unfortunately this is not (yet) the case for Hibernate Core. If you re using only Hibernate Core, you need to add the event listener configuration, as shown in listing 2.4.
Listing 2.4 Enable event listeners if you don t use Hibernate Annotations
<hibernate-configuration> <session-factory> ... <event type="post-update"> <listener class="org.hibernate.search.event.FullTextIndexEventListener"/> </event> <event type="post-insert"> <listener class="org.hibernate.search.event.FullTextIndexEventListener"/> </event> <event type="post-delete"> <listener class="org.hibernate.search.event.FullTextIndexEventListener"/> </event> <event type="post-collection-recreate"> <listener class="org.hibernate.search.event.FullTextIndexEventListener"/> </event> <event type="post-collection-remove"> <listener class="org.hibernate.search.event.FullTextIndexEventListener"/> </event> <event type="post-collection-update"> <listener class="org.hibernate.search.event.FullTextIndexEventListener"/> </event> </session-factory> </hibernate-configuration>
Now each time Hibernate Core inserts, updates, or deletes an entity, Hibernate Search will know about it.
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