2. Solr Repositories
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2. Solr Repositories

Abstract

This chapter includes details of the Solr repository implementation.

2.1 Introduction

2.1.1 Spring Namespace

The Spring Data Solr module contains a custom namespace allowing definition of repository beans as well as elements for instantiating a SolrServer .

Using the repositories element looks up Spring Data repositories as described in Section 1.2.3, “Creating repository instances” .

Example 2.1. Setting up Solr repositories using Namespace

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:solr="http://www.springframework.org/schema/data/solr"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/data/solr
    http://www.springframework.org/schema/data/solr/spring-solr-1.0.xsd">

  <solr:repositories base-package="com.acme.repositories" />
</beans>

Using the solr-server or embedded-solr-server element registers an instance of SolrServer in the context.

Example 2.2. HttpSolrServer using Namespace

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:solr="http://www.springframework.org/schema/data/solr"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/data/solr
    http://www.springframework.org/schema/data/solr/spring-solr-1.0.xsd">

  <solr:solr-server id="solrServer" url="http://locahost:8983/solr" />
</beans>


Example 2.3. LBSolrServer using Namespace

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:solr="http://www.springframework.org/schema/data/solr"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/data/solr
    http://www.springframework.org/schema/data/solr/spring-solr-1.0.xsd">

  <solr:solr-server id="solrServer" url="http://locahost:8983/solr,http://localhost:8984/solr" />
</beans>


Example 2.4. EmbeddedSolrServer using Namespace

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:solr="http://www.springframework.org/schema/data/solr"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/data/solr
    http://www.springframework.org/schema/data/solr/spring-solr-1.0.xsd">

  <solr:embedded-solr-server id="solrServer" solrHome="classpath:com/acme/solr" />
</beans>


2.1.2 Annotation based configuration

The Spring Data Solr repositories support cannot only be activated through an XML namespace but also using an annotation through JavaConfig.

Example 2.5. Spring Data Solr repositories using JavaConfig

@Configuration
@EnableSolrRepositories
class ApplicationConfig {
  
  @Bean
  public SolrServer solrServer() {
    EmbeddedSolrServerFactory factory = new EmbeddedSolrServerFactory("classpath:com/acme/solr");
    return factory.getSolrServer();
  }
  
  @Bean
  public SolrOperations solrTemplate() {
    return new SolrTemplate(solrServer());
  }
}

The configuration above sets up an EmbeddedSolrServer which is used by the SolrTemplate . Spring Data Solr Repositories are activated using the @EnableSolrRepositories annotation, which essentially carries the same attributes as the XML namespace does. If no base package is configured, it will use the one the configuration class resides in.


2.1.3 Multicore Support

Solr handles different collections within one core. Use MulticoreSolrServerFactory to create separate SolrServer for each core.

Example 2.6. Multicore Configuration

@Configuration
@EnableSolrRepositories(multicoreSupport = true)
class ApplicationConfig {

  private static final String PROPERTY_NAME_SOLR_SERVER_URL = "solr.host";

  @Resource
  private Environment environment;
  
  @Bean
  public SolrServer solrServer() {
    return new HttpSolrServer(environment.getRequiredProperty(PROPERTY_NAME_SOLR_SERVER_URL));
  }
  
}

2.1.4 Solr Repositores using CDI

The Spring Data Solr repositories can also be set up using CDI functionality.

Example 2.7. Spring Data Solr repositories using JavaConfig

class SolrTemplateProducer {

  @Produces
  @ApplicationScoped
  public SolrOperations createSolrTemplate() {
    return new SolrTemplate(new EmbeddedSolrServerFactory("classpath:com/acme/solr"));
  }
}

class ProductService {

  private ProductRepository repository;

  public Page<Product> findAvailableProductsByName(String name, Pageable pageable) {
    return repository.findByAvailableTrueAndNameStartingWith(name, pageable);
  }

  @Inject
  public void setRepository(ProductRepository repository) {
    this.repository = repository;
  }
}

2.1.5 Transaction Support

Solr supports transactions on server level means create, updaet, delete actions since the last commit/optimize/rollback are queued on the server and committed/optimized/rolled back at once. Spring Data Solr Repositories will participate in Spring Managed Transactions and commit/rollback changes on complete.

Example 2.8. 

@Transactional
public Product save(Product product) {
  Product savedProduct = jpaRepository.save(product);
  solrRepository.save(savedProduct);
  return savedProduct;
}

2.2 Query methods

2.2.1 Query lookup strategies

The Solr module supports defining a query manually as String or have it being derived from the method name.

[Note]Note
There is no QueryDSL Support present at this time.

Declared queries

Deriving the query from the method name is not always sufficient and/or may result in unreadable method names. In this case one might make either use of Solr named queries (see Section 2.2.4, “Using NamedQueries” ) or use the @Query annotation (see Section 2.2.3, “Using @Query Annotation” ).

2.2.2 Query creation

Generally the query creation mechanism for Solr works as described in Section 1.2, “Query methods” . Here's a short example of what a Solr query method translates into:

Example 2.9. Query creation from method names

public interface ProductRepository extends Repository<Product, String> {
  List<Product> findByNameAndPopularity(String name, Integer popularity);
}

The method name above will be translated into the following solr query 

q=name:?0 AND popularity:?1


A list of supported keywords for Solr is shown below.

Table 2.1. Supported keywords inside method names

KeywordSampleSolr Query String
And findByNameAndPopularity q=name:?0 AND popularity:?1
Or findByNameOrPopularity q=name:?0 OR popularity:?1
Is findByName q=name:?0
Not findByNameNot q=-name:?0
IsNull findByNameIsNull q=-name:[* TO *]
IsNotNull findByNameIsNotNull q=name:[* TO *]
Between findByPopularityBetween q=popularity:[?0 TO ?1]
LessThan findByPopularityLessThan q=popularity:[* TO ?0}
LessThanEqual findByPopularityLessThanEqual q=popularity:[* TO ?0]
GreaterThan findByPopularityGreaterThan q=popularity:{?0 TO *]
GreaterThanEqual findByPopularityGreaterThanEqual q=popularity:[?0 TO *]
Before findByLastModifiedBefore q=last_modified:[* TO ?0}
After findByLastModifiedAfter q=last_modified:{?0 TO *]
Like findByNameLike q=name:?0*
NotLike findByNameNotLike q=-name:?0*
StartingWith findByNameStartingWith q=name:?0*
EndingWith findByNameEndingWith q=name:*?0
Containing findByNameContaining q=name:*?0*
Matches findByNameMatches q=name:?0
In findByNameIn(Collection<String> names) q=name:(?0... )
NotIn findByNameNotIn(Collection<String> names) q=-name:(?0... )
Within findByStoreWithin(GeoLocation, Distance) q={!geofilt pt=?0.latitude,?0.longitude sfield=store d=?1}
Near findByStoreNear(GeoLocation, Distance) q={!bbox pt=?0.latitude,?0.longitude sfield=store d=?1}
Near findByStoreNear(BoundingBox) q=store[?0.start.latitude,?0.start.longitude TO ?0.end.latitude,?0.end.longitude]
True findByAvailableTrue q=inStock:true
False findByAvailableFalse q=inStock:false
OrderBy findByAvailableTrueOrderByNameDesc q=inStock:true&sort=name desc


[Note]Note
Collections types can be used along with 'Like', 'NotLike', 'StartingWith', 'EndingWith' and 'Containing'. 
Page<Product> findByNameLike(Collection<String> name);

2.2.3 Using @Query Annotation

Using named queries ( Section 2.2.4, “Using NamedQueries” ) to declare queries for entities is a valid approach and works fine for a small number of queries. As the queries themselves are tied to the Java method that executes them, you actually can bind them directly using the Spring Data Solr @Query annotation.

Example 2.10.  Declare query at the method using the @Query annotation. 

public interface ProductRepository extends SolrRepository<Product, String> {
  @Query("inStock:?0")
  List<Product> findByAvailable(Boolean available);
}

2.2.4 Using NamedQueries

Named queries can be kept in a properties file and wired to the accroding method. Please mind the naming convention described in the section called “Query lookup strategies” or use @Query .

Example 2.11.  Declare named query in properites file 

Product.findByNamedQuery=popularity:?0
Product.findByName=name:?0
public interface ProductRepository extends SolrCrudRepository<Product, String> {
				
  List<Product> findByNamedQuery(Integer popularity);
  
  @Query(name = "Product.findByName")
  List<Product> findByAnnotatedNamedQuery(String name); 
  
}

2.3 Document Mapping

Though there is already support for Entity Mapping within SolrJ, Spring Data Solr ships with its own mapping mechanism shown in the following section.

[Note]Note
DocumentObjectBinder has superior performance. Therefore usage is recommended if there is not need for custom type mapping. You can switch to DocumentObjectBinder by registering SolrJConverter within SolrTemplate.

2.3.1 Mapping Solr Converter

MappingSolrConverter allows you to register custom converters for your SolrDocument and SolrInputDocument as well as for other types nested within your beans. The Converter is not 100% compartible with DocumentObjectBinder and @Indexed has to be added with readonly=true to ignore fields from beeing written to solr.

Example 2.12.  Sample Document Mapping 

public class Product {
  @Field
  private String simpleProperty;
  
  @Field("somePropertyName")
  private String namedPropery;
  
  @Field
  private List<String> listOfValues;
  
  @Indexed(readonly = true)
  @Field("property_*")
  private List<String> ignoredFromWriting;
  
  @Field("mappedField_*")
  private Map<String, List<String>> mappedFieldValues; 
  
  @Field
  private GeoLocation location;
				
}

Taking a look as the above MappingSolrConverter will do as follows:

Table 2.2. 

PropertyWrite Mapping
simpleProperty <field name="simpleProperty">value</field>
namedPropery <field name="somePropertyName">value</field>
listOfValues <field name="listOfValues">value 1</field> <field name="listOfValues">value 2</field> <field name="listOfValues">value 3</field>
ignoredFromWriting //not written to document
mappedFieldValues <field name="mapentry[0].key">mapentry[0].value[0]</field> <field name="mapentry[0].key">mapentry[0].value[2]</field> <field name="mapentry[1].key">mapentry[1].value[0]</field>
location <field name="location">48.362893,14.534437</field>


To register a custom converter one must add CustomConversions to SolrTemplate initializing it with own Converter implementation.

Example 2.13. 

<bean id="solrConverter" class="org.springframework.data.solr.core.convert.MappingSolrConverter">
	<constructor-arg>
		<bean class="org.springframework.data.solr.core.mapping.SimpleSolrMappingContext" />
	</constructor-arg>
	<property name="customConversions" ref="customConversions" />
</bean> 

<bean id="customConversions" class="org.springframework.data.solr.core.convert.CustomConversions">
	<constructor-arg>
		<list>
			<bean class="com.acme.MyBeanToSolrInputDocumentConverter" />
		</list>
	</constructor-arg>
</bean>

<bean id="solrTemplate" class="org.springframework.data.solr.core.SolrTemplate">
	<constructor-arg ref="solrServer" />
	<property name="solrConverter" ref="solrConverter" />
</bean>


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