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>