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

一、域模型
先从最底层开始，把域模型建立起来，创建一个Plug-in project -

org.phrancol.osgi.jpetstore.domain，不创建Activator，创建一个package - org.phrancol.osgi.jpetstore.domain，将src\org\springframework\samples\jpetstore\domain 里面的java文件copy进去（重构一下package的名字，java文件里的package自动就变了，不用改每个文件），在MANIFEST.MF里面把依赖包导入一下并export这个package
domain里面的logic，引用了dao，dao也引用了domain，会导致一个错误，于是将logic做为一个独立的bundle，就称为域逻辑吧

二、域逻辑
创建一个Plug-in project - org.phrancol.osgi.jpetstore.domain.logic，不创建Activator，创建一个同名package，将jpetstore\src\org\springframework\samples\jpetstore\domain\logic里面的java文件copy进去，在MANIFEST.MF里面把依赖包导入

三、DAO
该做dao部分了，创建一个 Plug-in project - org.phrancol.osgi.jpetstore.dao 并创建一个同名package，将jpetstore\src\org\springframework\samples\jpetstore\dao里面的东西全部copy进去，在MANIFEST.MF里面导入依赖包（有一些包需要导入成bundle，例如 spring-jdbc,spring-ibatis），启动看看，发现spring-ibatis和persistence没有启动，手动启动spring-ibatis，发现缺少ibatis，于是 New-> Other -> Plug-in from existing JAR archives ，导入ibatis，再启动，发现少 javax.transaction，于是用相同方法导入。

四、配置文件
关于spring的配置文件，只有3个
petstore-servlet.xml - 用于mvc的，定义dispatch bean
applicationContext.xml - 用于域逻辑的
dataAccessContext-local.xml - 用于DAO的，定义了DataSource
（一）dataAccessContext-local.xml
1，将 jdbc.properties和sql-map-config.xml拷贝到META-INF目录里，sql-map-config.xml里面的资源路径可能需要修改一下，maps里面的模型的class属性也需要改一下
2，在META-INF目录中创建一个目录spring，将dataAccessContext-local.xml拷贝进去，将applicationContext.xml里面的加载jdbc.properties的bean移植过来，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属性值修改一下，再把sqlMapClient的configLocation的值修改成META-INF/sql-map-config.xml，例如

</bean>

</bean>

3，启动，报错，找不到ibatis的某个类，报错信息如下

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)

看来是spring-ibatis找不到com.ibatis.sqlmap.engine.transaction.external.ExternalTransactionConfig，来看看spring-ibatis的MANIFEST.MF，Dependencies的Import Packages, 加上com.ibatis.sqlmap.engine.transaction.external，再启动，找不到DBCP，导入common-DBCP和common-pool，再启动，正常，SS一下，还是正常

（二）applicationContext.xml
1，在org.phrancol.osgi.jpetstore.domain.logic的META-INF目录中创建一个目录spring，将applicationContext.xml拷贝进去，并改名为 logic-context.xml，删除propertyConfigurer这个bean，因为它已经被移到了dataAccessContext-local.xml里面，将里面的bean的class属性修改一下，启动，发现缺少org.aspectj，导入一个，再启动，报错

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

无法找到 accountDao，accountDao被定义在org.phrancol.osgi.jpetstore.dao里面了，于是现在需要使用spring-osgi 来进行跨bundle的引用了。
2，org.phrancol.osgi.jpetstore.dao/META-INF/spring目录中创建一个spring配置文件dataAccessContext-local-osgi.xml，使用<osgi:service>将accountDao和其他被引用的DAO注册成为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 也创建一个spring配置文件logic-context-osgi.xml，使用<osgi:reference>获取服务

<?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>

将logic-context.xml里面的bean petStore的属性引用修改一下

</bean>

再启动看看，还是报错

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

原来是transactionManager的问题，在DAO里面将transactionManager注册成osgi service，在domain.logic里面引用，然后给txAdvice加上transaction-manager属性

<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，启动，正常了

（三）petstore-servlet.xml
最后到spring-mvc的配置文件了，在前面已经将这个配置文件拷贝到org.phrancol.osgi.jpetstore.springmvc/META-INF/dispatcher目录下了，并且做了一些修改，让DispatcherServlet加载用以显示首页
1，新建一个package org.phrancol.osgi.jpetstore.springmvc.controller，将jpetstore\src\org\springframework\samples\jpetstore\web\spring里面的java文件拷贝进去，将依赖包导入，然后在petstore-servlet.xml里面加上一个dispatch-bean，

</bean>

启动看看效果，报错

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

居然找不到这个类，来看看ClassLoader

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

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

原来如此，那就这样

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

其实这样也是可以的，但是为了不绕弯路，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 交给Spring的ClassLoader吧
2，看一段代码 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，再来看看这个接口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，那就写个BundleContextAware，然后配置成Bean就可以了

4，创建一个 Plug-in project org.phrancol.osgi.jpetstore.util，并创建同名package，新建一个Interface HttpServiceRegister 用于注册Servlet或Resource，这个过程在方法 public void serviceRegister(BundleContext context);里进行，新建一个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，生成一个类org.phrancol.osgi.jpetstore.springmvc.SpringmvcHttpServiceRegister implements HttpServiceRegister
将Activator.start方法里的内容拷贝到SpringmvcHttpServiceRegister.serviceRegister方法里，删除Activator（MANIFEST.MF）

6，在org.phrancol.osgi.jpetstore.springmvc/META-INF/下建立一个目录spring，从别的地方copy一个bean配置文件过来，改名为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>

启动，报错，petstore-servlet.xml里面的bean petStore 找不到，这个bean被定义在org.phrancol.osgi.jpetstore.domain.logic里面，于是使用<osgi:service>和<osgi:reference>来获取
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加入如下内容（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，这次应该没问题了，启动看看效果，还是报错

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这个bean......

posted on 2007-09-07 10:26 Phrancol Yang 阅读(3983) 评论(0) 编辑收藏所属分类: OSGI

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