SpringDM笔记6-Fragment及配置Log4j Fragment Bundle
?? 未配置日志配置文件前，系统会抛出下面异常：
?? log4j:WARN No appenders could be found forlogger(org.springframework.osgi.extender.internal
?? .boot.ChainActivator). log4j:WARN Please initialize the log4j system properly.
1. Using the fragement configuration pattern
??? 一个Fragment是一个incomplate的Bundle,没有指定主Bundle是不能单独存在的，他不许附属于一个Host
??? Bundle. 它可以包含配置信息，classs文件，资源文件，但它不能有自己的Activator类或类加载器。
?
??? The host bundle can’t itself be a fragment and must be a full-fledged bundle, even if it relies on its
??? fragment to add classes or resources. A fragment can serve many purposes, such as completing
??? its host bundle with specific classes or providing configuration through resources (property or XML
??? files).
2. SpringDM's extender Export出来的通过Fragment可被修改的值：
??? (1)spring-osgi-extender.jar Bean Values Exposed for Fragments：见附件spring-osgi-extender.jar?
??? Bean Values Exposed for Fragments.jpg;
??? (2)spring-osgi-web-extender.jar Bean Values Exposed for Fragments:见附件spring-osgi-web-
??? extender.jar Bean Values Exposed for Fragments.jpg.
3. 实现Log4jFragment
??? (1) Fragement目录结构：
??? log4j-config/
?????? META-INF/
????????? MANIFEST.MF
?????? log4j.properties???????
??? （2）MAINFESt.MF文件：
???? Manifest-Version: 1.0
???? Fragment-Host: com.springsource.org.apache.log4j
???? Bundle-Version: 1.0.0
???? Bundle-Name: Log4J Configuration
???? Created-By: 1.6.0_13 (Sun Microsystems Inc.)
???? Bundle-ManifestVersion: 2
???? Bundle-SymbolicName: com.springsource.org.apache.log4j.config
?
???? (3) log4j.properties:
???? log4j.rootLogger=INFO, FILE
???? log4j.appender.FILE=org.apache.log4j.FileAppender
???? log4j.appender.FILE.File=SpringDM.log
???? log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
???? log4j.appender.FILE.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n%M
????
???? (4) 打包生成JAR：
???? 在log4j-config上一级目录中执行：
???? jar cvfm log4j-config.jar log4j-config/META-INF/MANIFEST.MF -C log4j-config 。
???? 生成log4j-config.jar。
4.? 安装该Fragement至OSGi 容器
???? 在config.ini文件组中增加：bundles/log/log4j-config.jar
???? 启动容器后，该Bundle的状态为：RESOLVED。
5.? 实现启用SpringDM注解功能的Fragment
???? (1)目录组织结构
???? SpringDM-Annotation-config/
???????????? META-INF/
??????????????? spring/
????????????????????? extender/
??????????????????????????? annotation-activator.xml
??????????????? MANIFEST.MF??
???? (2) MANIFEST.MF文件
???? Manifest-Version: 1.0
???? Bundle-ManifestVersion: 2
???? Fragment-Host: org.springframework.bundle.osgi.extender
???? Bundle-SymbolicName: com.apress.springosgi.ch4.fragment
???? Bundle-Name: HelloWorld Spring-OSGi Fragment
???? Bundle-Description: Spring-DM Fragment for activating OSGi annotation scanning
???? (3) annotation-activator.xml文件
???? <?xml version="1.0" encoding="UTF-8"?>
???? <beans xmlns="http://www.springframework.org/schema/beans"
??????????? xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
??????????? xsi:schemaLocation="http://www.springframework.org/schema/beans
??????????? http://www.springframework.org/schema/beans/spring-beans.xsd">
??????????? <bean id="extenderProperties">
?????????????????? <property name="process.annotations" value="true"/>
??????????? </bean>
???? </beans>
