关于Solr

Broadleaf项目中关于商品的搜索使用了嵌入式的Solr服务器，这个从配置文件中可以看出来。

• 项目主页： http://www.broadleafcommerce.com/

• 示例网站： http://demo.broadleafcommerce.org/

• 示例网站源代码： https://github.com/BroadleafCommerce/DemoSite

从示例网站源代码的applicationContext.xml文件中可以看到关于solr的配置：

    <bean id="solrEmbedded" class="java.lang.String">    <constructor-arg value="solrhome"/>     </bean>    <bean id="blSearchService" class="org.broadleafcommerce.core.search.service.solr.SolrSearchServiceImpl"> <constructor-arg name="solrServer" ref="${solr.source}" /><constructor-arg name="reindexServer" ref="${solr.source.reindex}" />     </bean>      <bean id="rebuildIndexJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean"><property name="targetObject" ref="blSearchService" />         <property name="targetMethod" value="rebuildIndex" />     </bean><bean id="rebuildIndexTrigger" class="org.springframework.scheduling.quartz.SimpleTriggerFactoryBean"><property name="jobDetail" ref="rebuildIndexJobDetail" />         <property name="startDelay" value="${solr.index.start.delay}" />         <property name="repeatInterval" value="${solr.index.repeat.interval}" />     </bean>     <bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">         <property name="triggers">             <list>                 <ref bean="rebuildIndexTrigger" />                 <!--<ref bean="purgeCartTrigger" />-->                 <!--<ref bean="purgeCustomerTrigger" />-->             </list>         </property>     </bean>

资源配置文件在common.properties:

web.defaultPageSize=15
web.maxPageSize=100
solr.source=solrEmbedded
solr.source.reindex=solrEmbedded
solr.index.start.delay=5000
solr.index.repeat.interval=3600000

从上可以看出使用的Solr是嵌入式服务，Solr配置文件（schema.xml和solrconfig.xml）在 https://github.com/BroadleafCommerce/DemoSite/tree/master/site/src/main/resources 目录下。

从源代码SolrSearchServiceImpl.java中可以看出,一共启动了两个Solr服务，分别对应primary和reindex两个solrcore，primary用于查询，reindex用于重建索引。

改进搜索引擎

改进目标

本篇文章只是将嵌入式Solr服务换成独立运行的Solr服务，你还可以更进一步换成SolrCloud集群。

• 单独搭建搜素引擎服务器

• 支持增量更新索引

• 支持手动重建索引

设计思路

• 1.修改原系统中的嵌入式搜索引擎为独立部署的搜索引擎，安装方法见下文。

• 2.扩展原系统中的SolrSearchServiceImpl类，添加增加索引的方法。

• 3.修改原来系统中商品的service类（我这里调用的是LLCatalogServiceImpl，该类是新添加的），在saveProduct方法中添加往搜索引擎添加索引的方法。

• 4.修改原系统中solr相关的配置文件。

• 5.修改原系统中的重建索引的定时任务，以支持手动重建索引。

实现方法

1、搭建独立运行的solr服务器

你可以参考：Apache Solr介绍及安装

关键在于solr/home的定义，以及在该目录下创建两个目录，分别为primary和reindex，两个目录下的配置文件都一样，solr/home目录结构如下：

➜  solrhome-solr  tree -L 3
.
├── primary │   └── conf │       ├── schema.xml │       └── solrconfig.xml
├── reindex │   └── conf │       ├── schema.xml │       └── solrconfig.xml └── solr.xml 4 directories, 5 files

solr.xml文件内容如下：

<?xml version="1.0" encoding="UTF-8" ?>
<solr persistent="true">   <cores defaultCoreName="primary" adminPath="/admin/cores">     <core instanceDir="reindex" name="reindex"/>     <core instanceDir="primary" name="primary"/>   </cores>
</solr>

schema.xml内容和原来的基本一样，只是添加了一行：

<field name="_version_" type="long" indexed="true" stored="true" multiValued="false"/>

solrconfig.xml内容如下：

<?xml version="1.0" encoding="UTF-8" ?>
<config>   <luceneMatchVersion>4.4</luceneMatchVersion>   <directoryFactory name="DirectoryFactory" class="${solr.directoryFactory:solr.StandardDirectoryFactory}"/><schemaFactory class="ClassicIndexSchemaFactory"/>   <updateHandler class="solr.DirectUpdateHandler2">     <autoCommit>         <maxDocs>2</maxDocs>         <maxTime>3000</maxTime>     </autoCommit>   </updateHandler>  <requestHandler name="/get" class="solr.RealTimeGetHandler">     <lst name="defaults">       <str name="omitHeader">true</str>     </lst>   </requestHandler>   <requestHandler name="/replication" class="solr.ReplicationHandler" startup="lazy" />    <requestDispatcher handleSelect="true" >     <requestParsers enableRemoteStreaming="false" multipartUploadLimitInKB="2048" formdataUploadLimitInKB="2048" />     <httpCaching never304="true" />  </requestDispatcher>   <requestHandler name="standard" class="solr.StandardRequestHandler" default="true" />   <requestHandler name="/analysis/field" startup="lazy" class="solr.FieldAnalysisRequestHandler" />   <requestHandler name="/update" class="solr.UpdateRequestHandler"  />   <requestHandler name="/update/csv" class="solr.CSVRequestHandler" startup="lazy" />   <requestHandler name="/update/json" class="solr.JsonUpdateRequestHandler" startup="lazy" />   <requestHandler name="/admin/" class="org.apache.solr.handler.admin.AdminHandlers" />   <requestHandler name="/admin/ping" class="solr.PingRequestHandler">     <lst name="invariants">       <str name="q">solrpingquery</str>     </lst>     <lst name="defaults">       <str name="echoParams">all</str>     </lst>   </requestHandler>   <queryResponseWriter name="json" class="solr.JSONResponseWriter">         <str name="content-type">text/plain; charset=UTF-8</str>   </queryResponseWriter>  <!-- config for the admin interface -->    <admin>     <defaultQuery>solr</defaultQuery>   </admin>
</config>

2、扩展SolrSearchServiceImpl类

在core模块创建org.broadleafcommerce.core.search.service.solr.ExtSolrSearchService接口，该接口定义如下：

package org.broadleafcommerce.core.search.service.solr;
import java.io.IOException;
import org.broadleafcommerce.common.exception.ServiceException;
import org.broadleafcommerce.core.catalog.domain.Product;
import org.broadleafcommerce.core.search.service.SearchService; public interface ExtSolrSearchService extends SearchService {     public void addProductIndex(Product product) throws ServiceException,     IOException; }

然后，创建其实现类org.broadleafcommerce.core.search.service.solr.ExtSolrSearchServiceImpl，该实现类定义如下：

package org.broadleafcommerce.core.search.service.solr;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import javax.annotation.Resource;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory;
import org.apache.solr.client.solrj.SolrServer;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocument;
import org.apache.solr.common.SolrDocumentList;
import org.apache.solr.common.SolrInputDocument;
import org.broadleafcommerce.common.exception.ServiceException;
import org.broadleafcommerce.common.locale.domain.Locale;
import org.broadleafcommerce.common.util.StopWatch;
import org.broadleafcommerce.common.util.TransactionUtils;
import org.broadleafcommerce.core.catalog.domain.Product;
import org.broadleafcommerce.core.search.domain.Field;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.xml.sax.SAXException; public class ExtSolrSearchServiceImpl extends SolrSearchServiceImpl implements         ExtSolrSearchService {     private static final Log LOG = LogFactory             .getLog(ExtSolrSearchServiceImpl.class);     @Resource(name = "blSolrIndexService")     protected SolrIndexServiceImpl solrIndexServiceImpl;     public ExtSolrSearchServiceImpl(SolrServer solrServer,SolrServer reindexServer) {super(solrServer, reindexServer);}public ExtSolrSearchServiceImpl(SolrServer solrServer) {super(solrServer);}public ExtSolrSearchServiceImpl(String solrServer, String reindexServer)throws IOException, ParserConfigurationException, SAXException {super(solrServer, reindexServer);}public ExtSolrSearchServiceImpl(String solrServer) throws IOException,ParserConfigurationException, SAXException {super(solrServer);}public void addProductIndex(Product product) throws ServiceException,IOException {TransactionStatus status = TransactionUtils.createTransaction("saveProduct", TransactionDefinition.PROPAGATION_REQUIRED,solrIndexServiceImpl.transactionManager, true);StopWatch s = new StopWatch();try {List<Field> fields = fieldDao.readAllProductFields();List<Locale> locales = solrIndexServiceImpl.getAllLocales();SolrInputDocument document = solrIndexServiceImpl.buildDocument(product, fields, locales);if (LOG.isTraceEnabled()) {LOG.trace(document);} SolrContext.getServer().add(document);SolrContext.getServer().commit();TransactionUtils.finalizeTransaction(status,solrIndexServiceImpl.transactionManager, false);} catch (SolrServerException e) {TransactionUtils.finalizeTransaction(status,solrIndexServiceImpl.transactionManager, true); throw new ServiceException("Could not rebuild index", e);} catch (IOException e) {TransactionUtils.finalizeTransaction(status,solrIndexServiceImpl.transactionManager, true);throw new ServiceException("Could not rebuild index", e); } catch (RuntimeException e) {TransactionUtils.finalizeTransaction(status,solrIndexServiceImpl.transactionManager, true);throw e;}LOG.info(String.format("Finished adding index in %s", s.toLapString()));}    protected List<Product> getProducts(QueryResponse response) {final List<Long> productIds = new ArrayList<Long>();SolrDocumentList docs = response.getResults();for (SolrDocument doc : docs) {productIds                     .add((Long) doc.getFieldValue(shs.getProductIdFieldName()));}/**          * TODO 请添加缓存相关代码          */ List<Product> products = productDao.readProductsByIds(productIds);// We have to sort the products list by the order of the productIds list// to maintain sortability in the UIif (products != null) { Collections.sort(products, new Comparator<Product>() {public int compare(Product o1, Product o2) {return new Integer(productIds.indexOf(o1.getId())).compareTo(productIds.indexOf(o2.getId())); }});}return products;}}

3、 修改solr相关配置文件

a. 删除web模块中/web/src/main/webapp/WEB-INF/applicationContext.xml的以下代码：

<bean id="blSearchService" class="org.broadleafcommerce.core.search.service.solr.SolrSearchServiceImpl"><constructor-arg name="solrServer" ref="${solr.source}" /><constructor-arg name="reindexServer" ref="${solr.source.reindex}" /></bean>

b.删除web模块中web/src/main/resources/runtime-properties/common.properties的以下代码：

solr.source=solrEmbedded
solr.source.reindex=solrEmbedded

c. 在core模块中core/src/main/resources/applicationContext.xml添加如下代码：

<bean id="solrServer" class="org.apache.solr.client.solrj.impl.HttpSolrServer"> <constructor-arg value="${solr.url}" />
</bean><bean id="solrReindexServer" class="org.apache.solr.client.solrj.impl.HttpSolrServer"> <constructor-arg value="${solr.url.reindex}" />
</bean> <bean id="blSearchService"     class="org.broadleafcommerce.core.search.service.solr.ExtSolrSearchServiceImpl">     <constructor-arg name="solrServer" ref="${solr.source}" />     <constructor-arg name="reindexServer" ref="${solr.source.reindex}" />
</bean>

d. 在core模块中core/src/main/resources/runtime-properties/common-shared.properties添加如下代码：

solr.url=
solr.url.reindex=http://localhost:8080/solr/reindex
solr.source=solrServer
solr.source.reindex=solrReindexServer

4、 修改LLCatalogServiceImpl类

添加如下代码：

@Resource(name = "blSearchService")
private ExtSolrSearchService extSolrSearchService;

修改该类的saveProduct方法如下：

@Override
@Transactional("blTransactionManager")
public Product saveProduct(Product product) {Product dbProduct = catalogService.saveProduct(product);     try {         extSolrSearchService.addProductIndex(dbProduct);     } catch (ServiceException e) {e.printStackTrace();throw new RuntimeException(e);     } catch (IOException e) {         e.printStackTrace();         throw new RuntimeException(e);     }     return dbProduct;}

5、 修改定时任务

a. web系统启动时候，会查询数据库中商品，然后重建索引。该功能在applicationContext.xml中已经定义了定时任务，建议取消该定时任务。去掉以下代码：

<bean id="rebuildIndexJobDetail"     class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean"><property name="targetObject" ref="blSearchService" />     <property name="targetMethod" value="rebuildIndex" />
</bean> <bean id="rebuildIndexTrigger" class="org.springframework.scheduling.quartz.SimpleTriggerBean">     <property name="jobDetail" ref="rebuildIndexJobDetail" />     <property name="startDelay" value="${solr.index.start.delay}" />     <property name="repeatInterval" value="${solr.index.repeat.interval}" />
</bean><bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean"><property name="triggers"><list>             <ref bean="rebuildIndexTrigger" />         </list>     </property>
</bean>

b. 编写main方法，打成jar包，然后编写shell脚本，用于手动重建索引或者设置定时任务。该类需要获取一个名称为blSearchService的bean，然后调用该bean的rebuildIndex方法,主要代码如下。

@Resource(name = "blSearchService")
private SearchService extSolrSearchService;public void doRebuild(){ extSolrSearchService.rebuildIndex(); }