Compass
作者： 地獄男爵
1.概述
springside 官方網(wǎng)站: http://www.springside.org.cn
網(wǎng)站: http://www.compassframework.org/
Compass是一流的開(kāi)放源碼JAVA搜索引擎框架，對(duì)于你的應(yīng)用修飾，搜索引擎語(yǔ)義更具有能力。依靠頂級(jí)的Lucene搜索引擎，Compass 結(jié)合了，像 Hibernate和 Sprin的流行的框架，為你的應(yīng)用提供了從數(shù)據(jù)模型和數(shù)據(jù)源同步改變的搜索力.并且添加了2方面的特征,事物管理和快速更新優(yōu)化. Compass的目標(biāo)是：把java應(yīng)用簡(jiǎn)單集成到搜索引擎中.編碼更少，查找數(shù)據(jù)更便捷 .
2.Object/Search Engine Mapping - 配置XML
OSEM: 對(duì)象搜索引擎影影射(Object Search Engine Mapping),通過(guò)xml配置文件,提供了POJO's (Plain Old Java Objects)到搜索引擎.
2.1 XML配置
一般都是 *.cpm.xml 形式 .
1) package指定了對(duì)應(yīng)java類的包名，
2)class為pojo類名.contract為公共部分, 子類被可以extends.Property 對(duì) java類的屬性。
3)資源的Property引用的Search Engine meta-data.
注意: id為類標(biāo)識(shí).
<compass-core-mapping package="org.springside.bookstore.domain"> <contract alias="product">
<id name="id"/>
<property name="name">
<meta-data>${springside.name}</meta-data>
</property>
<property name="descn">
<meta-data>${springside.descn}</meta-data>
</property>
</contract>
<class name="Book" alias="${springside.book}" extends="product">
<property name="author">
<meta-data>${springside.author}</meta-data>
</property>
<property name="publisher">
<meta-data>${springside.publisher}</meta-data>
</property>
</class>
</compass-core-mapping>
3.Common Meta Data
定義Compass配置文件(*.cfg.xml). Compass 自動(dòng)替換OSEM對(duì)應(yīng)的原數(shù)據(jù)(Common meta-data)標(biāo)簽的值. ${...} 很像ant.
簡(jiǎn)單的可以理解為alias對(duì)應(yīng)為表,meta-data為column.具體闡述,請(qǐng)見(jiàn)compass reference(Chapter 3. Search Engine)
<compass-core-meta-data> <meta-data-group id="springside" displayName="SpringSide Book Meta Data">
<description>SpringSide Meta Data</description>
<uri>http://compass/springside</uri>
<alias id="book" displayName="Book">
<description>Book alias</description>
<uri>http://compass/springside/alias/book</uri>
<name>book</name>
</alias>
<meta-data id="name" displayName="Name">
<uri>http://compass/springside/name</uri>
<name>descn</name>
</meta-data>
<meta-data id="descn" displayName="Description">
<uri>http://compass/springside/descn</uri>
<name>descn</name>
</meta-data>
<meta-data id="author" displayName="Author">
<description>The author of a book</description>
<uri>http://compass/springside/author</uri>
<name>author</name>
</meta-data>
<meta-data id="publisher" displayName="Publisher">
<description>The publisher of a book</description>
<uri>http://compass/springside/publisher</uri>
<name>publisher</name>
</meta-data>
</meta-data-group>
</compass-core-meta-data>?
4. 與spring,hibernate集成的實(shí)現(xiàn)
4.1 hibernate 配置
配置通透的pojo,class所應(yīng)對(duì)的hibernate配置hbm.xml,這里就不在熬述.具體可見(jiàn)springside源碼.
4.2 spring配置
hiberante中的sessionFactory,transactionManager相比大家也是輕車(chē)熟路了.這里還是代過(guò)(因?yàn)椴粻砍陡遒M(fèi)的問(wèn)題嗎^_^ ).compass已經(jīng)對(duì)對(duì)spring集成做了很好的封裝，讓我們的使用更加簡(jiǎn)單,我們可以不為compass編寫(xiě)一行代碼,就可以做完搜索引擎的檢索.下面談一下compass在spring中的簡(jiǎn)明配置.
<beans>
<bean id="compass" class="org.compass.spring.LocalCompassBean">
<property name="resourceLocations">
<list>
<value>classpath:compass-springside.cmd.xml</value>
<value>classpath:compass-springside.cpm.xml</value>
</list>
</property>
<property name="compassSettings">
<props>
<prop key="compass.engine.connection">file://${user.home}/springside/compass</prop>
<prop key="compass.transaction.factory">org.compass.spring.transaction.SpringSyncTransactionFactory</prop>
</props>
</property>
<property name="transactionManager" ref="transactionManager"/>
</bean>
<bean id="hibernateGpsDevice" class="org.compass.spring.device.hibernate.SpringHibernate3GpsDevice">
<property name="name">
<value>hibernateDevice</value>
</property>
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<bean id="compassGps" class="org.compass.gps.impl.SingleCompassGps" init-method="start" destroy-method="stop">
<property name="compass" ref="compass"/>
<property name="gpsDevices">
<list>
<ref local="hibernateGpsDevice"/>
</list>
</property>
</bean>
</beans>
resourceLocations: 裝入compass的配置文件 *.cmd.xml,*.cpm.xml
compass.engine.connection: 就是索引做存放的本機(jī)文件的路徑.搜索引擎也是根據(jù)本機(jī)文件索引,進(jìn)行查詢.
hibernateGpsDevice: 注入sessionFactory.
The Hibernate Gps Device:用Hibernate 3 事件系統(tǒng),提高支持Real Time Data Mirroring.經(jīng)Hiberante的數(shù)據(jù)改變自動(dòng)被反射到索引里面.
4.3 web中的配置
<bean id="indexBookController" class="org.compass.spring.web.mvc.CompassIndexController">
<property name="compassGps"><ref bean="compassGps"/></property>
<property name="indexView"><value>/admin/indexBook.jsp</value></property>
<property name="indexResultsView"><value>/admin/indexBook.jsp</value></property>
</bean>
<bean id="searchBookController" class="org.compass.spring.web.mvc.CompassSearchController">
<property name="compass"><ref bean="compass"/></property>
<property name="searchView"><value>/home/top.jsp</value></property>
<property name="searchResultsView"><value>/home/searchBook.jsp</value></property>
<property name="pageSize"><value>3</value></property>
</bean>
調(diào)用到indexBookController,完成索引重建,調(diào)用到searchBookController,完成搜索.
搜索頁(yè)面 :
<INPUT type="text" size="20" name="query" class="search" value="">
搜索結(jié)果:
<div class="left"><c:if test="${! empty searchResults}">
耗時(shí)： <c:out value="${searchResults.searchTime}" />ms
<c:if test="${empty searchResults.hits}">
，沒(méi)有找到符合條件的圖書(shū)，請(qǐng)確保已在管理后臺(tái)建立索引。
</c:if>
<c:forEach var="hit" items="${searchResults.hits}">
<c:choose>
<c:when test="${hit.alias == 'book'}">
<p><a
href="<c:url value="/bookstore.do?action=bookDetail&id=${hit.data.id}"/>">
《<c:out value="${hit.data.name}" />》 </a> <br />
作者：<c:out value="${hit.data.author}" /> 出版社： <c:out
value="${hit.data.publisher}" /></p>
</c:when>
</c:choose>
</c:forEach>
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