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Developing Equinox/Spring-osgi/Spring Framework Web Application Part 2 - 使用Spring-OSGI

一、域模型
先從最底層開始，把域模型建立起來，創建一個Plug-in project -

org.phrancol.osgi.jpetstore.domain，不創建Activator，創建一個package - org.phrancol.osgi.jpetstore.domain，將src\org\springframework\samples\jpetstore\domain 里面的java文件copy進去（重構一下package的名字，java文件里的package自動就變了，不用改每個文件），在MANIFEST.MF里面把依賴包導入一下并export這個package
domain里面的logic，引用了dao，dao也引用了domain，會導致一個錯誤，于是將logic做為一個獨立的bundle，就稱為域邏輯吧

二、域邏輯
創建一個Plug-in project - org.phrancol.osgi.jpetstore.domain.logic，不創建Activator，創建一個同名package，將jpetstore\src\org\springframework\samples\jpetstore\domain\logic里面的java文件copy進去，在MANIFEST.MF里面把依賴包導入

三、DAO
該做dao部分了，創建一個 Plug-in project - org.phrancol.osgi.jpetstore.dao 并創建一個同名package，將jpetstore\src\org\springframework\samples\jpetstore\dao里面的東西全部copy進去，在MANIFEST.MF里面導入依賴包（有一些包需要導入成bundle，例如 spring-jdbc,spring-ibatis），啟動看看，發現spring-ibatis和persistence沒有啟動，手動啟動spring-ibatis，發現缺少ibatis，于是 New-> Other -> Plug-in from existing JAR archives ，導入ibatis，再啟動，發現少 javax.transaction，于是用相同方法導入。

四、配置文件
關于spring的配置文件，只有3個
petstore-servlet.xml - 用于mvc的，定義dispatch bean
applicationContext.xml - 用于域邏輯的
dataAccessContext-local.xml - 用于DAO的，定義了DataSource
（一）dataAccessContext-local.xml
1，將 jdbc.properties和sql-map-config.xml拷貝到META-INF目錄里，sql-map-config.xml里面的資源路徑可能需要修改一下，maps里面的模型的class屬性也需要改一下
2，在META-INF目錄中創建一個目錄spring，將dataAccessContext-local.xml拷貝進去，將applicationContext.xml里面的加載jdbc.properties的bean移植過來，放在DataSource的上面

<list>

<value>META-INF/jdbc.properties</value>

</list>

</property>

</bean>

再把dataAccessContext-local.xml里面的dao-bean->class屬性值修改一下，再把sqlMapClient的configLocation的值修改成META-INF/sql-map-config.xml，例如

</bean>

</bean>

3，啟動，報錯，找不到ibatis的某個類，報錯信息如下

org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.orm.ibatis.SqlMapClientFactoryBean]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: com.ibatis.sqlmap.engine.transaction.external.ExternalTransactionConfig

Caused by: java.lang.NoClassDefFoundError: com.ibatis.sqlmap.engine.transaction.external.ExternalTransactionConfig

at org.springframework.orm.ibatis.SqlMapClientFactoryBean.class$(SqlMapClientFactoryBean.java:72)

看來是spring-ibatis找不到com.ibatis.sqlmap.engine.transaction.external.ExternalTransactionConfig，來看看spring-ibatis的MANIFEST.MF，Dependencies的Import Packages, 加上com.ibatis.sqlmap.engine.transaction.external，再啟動，找不到DBCP，導入common-DBCP和common-pool，再啟動，正常，SS一下，還是正常

（二）applicationContext.xml
1，在org.phrancol.osgi.jpetstore.domain.logic的META-INF目錄中創建一個目錄spring，將applicationContext.xml拷貝進去，并改名為 logic-context.xml，刪除propertyConfigurer這個bean，因為它已經被移到了dataAccessContext-local.xml里面，將里面的bean的class屬性修改一下，啟動，發現缺少org.aspectj，導入一個，再啟動，報錯

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'accountDao' is defined

無法找到 accountDao，accountDao被定義在org.phrancol.osgi.jpetstore.dao里面了，于是現在需要使用spring-osgi 來進行跨bundle的引用了。
2，org.phrancol.osgi.jpetstore.dao/META-INF/spring目錄中創建一個spring配置文件dataAccessContext-local-osgi.xml，使用<osgi:service>將accountDao和其他被引用的DAO注冊成為OSGI Service

<?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:osgi="http://www.springframework.org/schema/osgi"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/osgi http://www.springframework.org/schema/osgi/spring-osgi.xsd">

<osgi:service id="accountDaoOsgi" ref="accountDao"

interface="org.phrancol.osgi.jpetstore.dao.AccountDao">

</osgi:service>

<osgi:service id="categoryDaoOsgi" ref="categoryDao"

interface="org.phrancol.osgi.jpetstore.dao.CategoryDao">

</osgi:service>

<osgi:service id="productDaoOsgi" ref="productDao"

interface="org.phrancol.osgi.jpetstore.dao.ProductDao">

</osgi:service>

<osgi:service id="itemDaoOsgi" ref="itemDao"

interface="org.phrancol.osgi.jpetstore.dao.ItemDao">

</osgi:service>

<osgi:service id="orderDaoOsgi" ref="orderDao"

interface="org.phrancol.osgi.jpetstore.dao.OrderDao">

</osgi:service>

</beans>

3，在org.phrancol.osgi.jpetstore.domain.logic/META-INF/spring 也創建一個spring配置文件logic-context-osgi.xml，使用<osgi:reference>獲取服務

<?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:osgi="http://www.springframework.org/schema/osgi"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd

http://www.springframework.org/schema/osgi http://www.springframework.org/schema/osgi/spring-osgi.xsd">

<osgi:reference id="accountDaoOsgi" interface="org.phrancol.osgi.jpetstore.dao.AccountDao"/>

<osgi:reference id="categoryDaoOsgi" interface="org.phrancol.osgi.jpetstore.dao.CategoryDao"/>

<osgi:reference id="productDaoOsgi" interface="org.phrancol.osgi.jpetstore.dao.ProductDao"/>

<osgi:reference id="itemDaoOsgi" interface="org.phrancol.osgi.jpetstore.dao.ItemDao"/>

<osgi:reference id="orderDaoOsgi" interface="org.phrancol.osgi.jpetstore.dao.OrderDao"/>

</beans>

將logic-context.xml里面的bean petStore的屬性引用修改一下

</bean>

再啟動看看，還是報錯

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'txAdvice': Cannot resolve reference to bean 'transactionManager' while setting bean property 'transactionManager'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'transactionManager' is defined

原來是transactionManager的問題，在DAO里面將transactionManager注冊成osgi service，在domain.logic里面引用，然后給txAdvice加上transaction-manager屬性

<tx:advice id="txAdvice" transaction-manager="transactionManagerOsgi">

<tx:attributes>

<tx:method name="insert*"/>

<tx:method name="update*"/>

<tx:method name="*" read-only="true"/>

</tx:attributes>

</tx:advice>

OK，啟動，正常了

（三）petstore-servlet.xml
最后到spring-mvc的配置文件了，在前面已經將這個配置文件拷貝到org.phrancol.osgi.jpetstore.springmvc/META-INF/dispatcher目錄下了，并且做了一些修改，讓DispatcherServlet加載用以顯示首頁
1，新建一個package org.phrancol.osgi.jpetstore.springmvc.controller，將jpetstore\src\org\springframework\samples\jpetstore\web\spring里面的java文件拷貝進去，將依賴包導入，然后在petstore-servlet.xml里面加上一個dispatch-bean，

</bean>

啟動看看效果，報錯

Caused by: java.lang.ClassNotFoundException: org.phrancol.osgi.jpetstore.springmvc.controller.AddItemToCartController

居然找不到這個類，來看看ClassLoader

Thread.currentThread().getContextClassLoader() -> org.eclipse.core.runtime.internal.adaptor.ContextFinder

Activator's ClassLoader -> org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader

原來如此，那就這樣

Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader())

其實這樣也是可以的，但是為了不繞彎路，而且既然是Spring的配置文件，Spring-osgi也提供得有Bundle的ClassLoader -> org.springframework.osgi.context.support.BundleDelegatingClassLoader 交給Spring的ClassLoader吧
2，看一段代碼 org.springframework.osgi.context.support.BundleContextAwareProcessor

public boolean postProcessAfterInstantiation(Object bean, String beanName) throws BeansException {

if (bean instanceof BundleContextAware) {

if (this.bundleContext == null) {

throw new IllegalStateException("Cannot satisfy BundleContextAware for bean '" +

beanName + "' without BundleContext");

}

if (logger.isDebugEnabled()) {

logger.debug("Invoking setBundleContext on BundleContextAware bean '" + beanName + "'");

}

((BundleContextAware) bean).setBundleContext(this.bundleContext);

}

return true;

}

3，再來看看這個接口org.springframework.osgi.context.BundleContextAware

Interface that enables beans to find the bundle context they are defined in. Note that in most circumstances there is no need for a bean to implement this interface.

OK，那就寫個BundleContextAware，然后配置成Bean就可以了

4，創建一個 Plug-in project org.phrancol.osgi.jpetstore.util，并創建同名package，新建一個Interface HttpServiceRegister 用于注冊Servlet或Resource，這個過程在方法 public void serviceRegister(BundleContext context);里進行，新建一個Class BundleServiceRegister

public class BundleServiceRegister implements BundleContextAware {

private HttpServiceRegister httpServiceRegister;

public BundleServiceRegister(HttpServiceRegister httpServiceRegister){

this.httpServiceRegister = httpServiceRegister;

}

public void setBundleContext(BundleContext context) {

this.httpServiceRegister.serviceRegister(context);

}

5，生成一個類org.phrancol.osgi.jpetstore.springmvc.SpringmvcHttpServiceRegister implements HttpServiceRegister
將Activator.start方法里的內容拷貝到SpringmvcHttpServiceRegister.serviceRegister方法里，刪除Activator（MANIFEST.MF）

6，在org.phrancol.osgi.jpetstore.springmvc/META-INF/下建立一個目錄spring，從別的地方copy一個bean配置文件過來，改名為logic-context.xml，加入如下配置

<beans>

<bean id="springHttpServiceRegister"

class="org.phrancol.osgi.jpetstore.util.BundleServiceRegister">

<constructor-arg>

</constructor-arg>

</bean>

</beans>

啟動，報錯，petstore-servlet.xml里面的bean petStore 找不到，這個bean被定義在org.phrancol.osgi.jpetstore.domain.logic里面，于是使用<osgi:service>和<osgi:reference>來獲取
在logic-context-osgi.xml里面加上

<osgi:service id="petStoreOsgi" ref="petStore"

interface="org.phrancol.osgi.jpetstore.domain.logic.PetStoreFacade">

</osgi:service>

在springmvc-context.xml加入如下內容（注意namespaces）

<osgi:reference id="petStoreOsgi"

interface="org.phrancol.osgi.jpetstore.domain.logic.PetStoreFacade" />

修改一下petstore-servlet.xml

改成

OK，這次應該沒問題了，啟動看看效果，還是報錯

org.springframework.beans.factory.BeanCreationException: Error creating bean with name '/shop/addItemToCart.do' defined in ServletContext resource [/META-INF/dispatcher/petstore-servlet.xml]: Cannot resolve reference to bean 'petStoreOsgi' while setting bean property 'petStore'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'petStoreOsgi' is defined

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'petStoreOsgi' is defined

at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:353)

at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedBeanDefinition(AbstractBeanFactory.java:916)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:243)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)

at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:261)

at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:109)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1100)

居然找不到petStoreOsgi這個bean......

posted on 2007-09-07 10:26 Phrancol Yang 閱讀(3990) 評論(0) 編輯收藏所屬分類: OSGI

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