我不想利用Spring DATA MongoDB支持.
我想利用名为Morphia的MongoDB的ORM.
https://github.com/mongodb/morphia
我想用Spring Boot配置Morphia.我想以一种遵循Spring Boot理念的方式外化Morphia的配置.
我想利用环境变量来配置Morphia属性.
实现这一目的的Spring Boot方法是什么？
在一个简单的主程序中会做以下事情以使Morhpia ORM正常工作.
private Morphia morphia;
private MongoClient mongoClient;
morphia = new Morphia();
// Person is an entity object with Morphia annotations
morphia.map(Person.class);
// THESE properties MUST be read from environment variables in Spring BOOT.
final String host = "localhost";
final int port = 27017;
mongoClient = new MongoClient(host,port);
//Set database
// this instance would be autowired all data access classes
Datastore ds = morphia.createDatastore(mongoClient,"dataStoreInstanceId");
// this is how instance would be used in those data accesses classes
Person p = ds.find(Person.class,"username","john").get();
类似Spring Boot的方法是创建一个具有所需属性的AutoConfiguration,它创建一个Datastore实例作为bean.
在Reference Guide中,您将找到如何设置属性并连接到MongoDB.
Morphia的AutoConfiguration可能如下所示：
@Configuration
public class MorphiaAutoConfiguration {
@Autowired
private MongoClient mongoClient; // created from MongoAutoConfiguration
@Bean
public Datastore datastore() {
Morphia morphia = new Morphia();
// map entities,there is maybe a better way to find and map all entities
ClassPathScanningCandidateComponentProvider entityScanner = new ClassPathScanningCandidateComponentProvider(true);
entityScanner.addIncludeFilter(new AnnotationTypeFilter(Entity.class));
for (BeanDefinition candidate : scanner.findCandidateComponents("your.basepackage")) { // from properties?
morphia.map(Class.forName(candidate.getBeanClassName()));
}
return morphia.createDatastore(mongoClient,"dataStoreInstanceId"); // "dataStoreInstanceId" may come from properties?
}
}
然后,您可以通常的方式在其他Spring bean中自动装配数据存储区：
@Autowired
private Datastore datastore;
如果某些点不正确或不清楚,请查看Spring Boot中现有的* AutoConfiguration类.
