让我描述一下它是如何在我们的项目中实现的。我们正在使用带有 SP2 的 AEM 6.3。
我们在根 pom.xml 中有下一个依赖项：
<!-- JPA -->
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.1.10.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.1.10.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate.common</groupId>
<artifactId>hibernate-commons-annotations</artifactId>
<version>5.0.1.Final</version>
</dependency>
<dependency>
<groupId>com.ibm.db2.jcc</groupId>
<artifactId>db2jcc4</artifactId>
<version>11.1</version>
<scope>system</scope>
<systemPath>${project.root.path}/lib/db2jcc4.jar</systemPath>
</dependency>
<dependency>
<groupId>org.jboss.logging</groupId>
<artifactId>jboss-logging</artifactId>
<version>3.3.2.Final</version>
</dependency>
<dependency>
<groupId>com.fasterxml</groupId>
<artifactId>classmate</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>antlr</groupId>
<artifactId>antlr</artifactId>
<version>2.7.7</version>
</dependency>
<!-- local development database -->
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.194</version>
</dependency>
<!-- /JPA-->
然后我们有了提供 JPA 依赖项的包和允许获取休眠会话的 OSGI 服务。包 pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.myproject</groupId>
<artifactId>myproject-bundles</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<artifactId>com.myproject.db</artifactId>
<packaging>bundle</packaging>
<name>myproject - DB bundle</name>
<description>OSGI bundle to work with a database</description>
<properties>
<bundle.export>
com.myproject.db.*,
javax.persistence,
org.hibernate,
org.hibernate.cfg,
org.hibernate.proxy,
org.hibernate.boot.registry,
org.hibernate.annotations,
org.hibernate.service,
org.hibernate.criterion,
org.hibernate.transform
</bundle.export>
<bundle.import>*;resolution:=optional</bundle.import>
<!-- Import JDBC driver dynamically -->
<bundle.dynamic.import>com.ibm.*,javassist.util.*</bundle.dynamic.import>
<bundle.embed>
hibernate-jpa-2.1-api,hibernate-core,hibernate-entitymanager,hibernate-commons-annotations,jboss-logging,antlr
</bundle.embed>
<project.root.path>${project.basedir}/../..</project.root.path>
</properties>
<dependencies>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate.common</groupId>
<artifactId>hibernate-commons-annotations</artifactId>
</dependency>
<dependency>
<groupId>org.jboss.logging</groupId>
<artifactId>jboss-logging</artifactId>
</dependency>
<dependency>
<groupId>com.ibm.db2.jcc</groupId>
<artifactId>db2jcc4</artifactId>
</dependency>
<dependency>
<groupId>antlr</groupId>
<artifactId>antlr</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>com.myproject</groupId>
<artifactId>com.myproject.common</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>
在捆绑包中我们有下一个服务：
package com.myproject.db;
import org.hibernate.Session;
public interface JPASessionFactory {
Session openSession();
void closeSession(Session session);
}
实现：
package com.myproject.db.impl;
import com.myproject.db.JPASessionFactory;
import org.apache.felix.scr.annotations.*;
import org.apache.sling.commons.osgi.PropertiesUtil;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.cfg.Environment;
import javax.sql.DataSource;
import java.util.Map;
@Service
@Component(metatype = true, policy = ConfigurationPolicy.REQUIRE)
@Properties({
@Property(label = "Hibernate SQL dialect", name = Environment.DIALECT),
@Property(label = "Show SQL", name = Environment.SHOW_SQL, boolValue = false),
@Property(label = "Bulk ID Strategy", name = Environment.HQL_BULK_ID_STRATEGY)
})
public class JPASessionFactoryImpl implements JPASessionFactory {
@Reference(target = "(datasource.name=myproject)")
private DataSource dataSource;
private SessionFactory sessionFactory;
@Activate
protected void activate(Map<String, Object> properties) {
StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder()
.configure()
.applySetting(Environment.DIALECT, PropertiesUtil.toString(properties.get(Environment.DIALECT), ""))
.applySetting(Environment.SHOW_SQL, PropertiesUtil.toBoolean(properties.get(Environment.SHOW_SQL), false))
.applySetting(Environment.DATASOURCE, dataSource);
String bulkIdStrategy = PropertiesUtil.toString(properties.get(Environment.HQL_BULK_ID_STRATEGY), "");
if (!bulkIdStrategy.isEmpty()) {
builder.applySetting(Environment.HQL_BULK_ID_STRATEGY, bulkIdStrategy);
}
sessionFactory = new Configuration().buildSessionFactory(builder.build());
}
@Deactivate
protected void deactivate() {
if (sessionFactory != null) {
sessionFactory.close();
}
}
@Override
public Session openSession() {
return sessionFactory.openSession();
}
@Override
public void closeSession(Session session) {
if (session != null && session.isOpen()) {
session.close();
}
}
}
服务的 osgi 配置：
<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0"
jcr:primaryType="sling:OsgiConfig"
hibernate.dialect="org.hibernate.dialect.H2Dialect"
hibernate.show_sql="{Boolean}true"/>
DataSourceFactory 应用程序的配置/myproject-forms/configuration/config.local/org.apache.sling.datasource.DataSourceFactory-localh2.xml：
<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0"
jcr:primaryType="sling:OsgiConfig"
datasource.name="myproject"
driverClassName="org.h2.Driver"
url="jdbc:h2:./myprojectlocal;AUTO_SERVER=TRUE"
username="sa"
password=""
testOnBorrow="{Boolean}true"
testOnReturn="{Boolean}true"
testWhileIdle="{Boolean}true"
validationQuery="SELECT 1"/>
我们还有 Hibernate 配置文件 hibernate.cfg.xml 在 bundle 的“resources”文件夹中
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hbm2ddl.auto">update</property>
<property name="current_session_context_class">thread</property>
<mapping class="com.myproject.db.Entity1"/>
<mapping class="com.myproject.db.Entity2"/>
</session-factory>
</hibernate-configuration>