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OSGi开发之Spring-OSGi(一)发布服务[原]

作者:coolflyr_reg 日期:2008-06-24 02:51:14

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我使用的Spring-OSGi的版本是1.1.0-m2版本，下载下来按照压缩包里文档的说明，安装好PDE的开发环境，然后正式开始。

首先配置OSGi Framework的运行环境，我的Eclipse是3.3的，运行环境需要以下的Bundle： 
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?	org.apache.commons.logging
?	org.eclipse.osgi
?	org.springframework.bundle.osgi.core
?	org.springframework.bundle.osgi.extender
?	org.springframework.bundle.osgi.io
?	org.springframework.bundle.spring.aop
?	org.springframework.bundle.spring.beans
?	org.springframework.bundle.spring.context
?	org.springframework.bundle.spring.context.support
?	org.springframework.bundle.spring.core
?	org.springframework.osgi.aopalliance.osgi
?	org.springframework.osgi.backport-util-concurrent.osgi
?	org.springframework.osgi.log4j.osgi
?	org.springframework.osgi.servlet-api.osgi
?	slf4j.api
?	slf4j.log4j12


操作步骤：点击菜单Run->Open Run Dialog…，在左侧的列表中，找到OSGi Framework，右键单击，New，修改Name为SpringOSGiDemo，并在Bundles选项卡中，选中以上列举的Bundle， 其中，有些Bundle在这个例子中并不需要，可以自己反复试验，看哪些需要哪些不需要。然后点击Apply，点Run。

在Console中会出现如下显示： 
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osgi> 2008-6-24 1:33:02 org.springframework.osgi.extender.internal.activator.ContextLoaderListener start
信息: Starting [org.springframework.bundle.osgi.extender] bundle v.[1.1.0.m2]
2008-6-24 1:33:02 org.springframework.osgi.extender.internal.support.ExtenderConfiguration <init>
信息: No custom configuration detected; using defaults
2008-6-24 1:33:02 org.springframework.osgi.extender.internal.activator.ContextLoaderListener addDefaultPostProcessors
信息: Disabled automatic Spring-DM annotation processing; [ org.springframework.osgi.extender.annotation.auto.processing=null]


输入ss命令，安装的插件如下： 
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ss
 
Framework is launched.
 
id	State       Bundle
0	ACTIVE      org.eclipse.osgi_3.3.1.R33x_v20070828
1	ACTIVE      org.springframework.bundle.osgi.io_1.1.0.m2
2	ACTIVE      org.springframework.bundle.osgi.extender_1.1.0.m2
3	ACTIVE      org.springframework.osgi.log4j.osgi_1.2.15.SNAPSHOT
4	ACTIVE      org.springframework.bundle.spring.beans_2.5.4
5	ACTIVE      org.springframework.bundle.spring.context_2.5.4
6	ACTIVE      org.springframework.osgi.servlet-api.osgi_2.5.0.SNAPSHOT
7	ACTIVE      org.springframework.osgi.backport-util-concurrent.osgi_3.1.0.SNAPSHOT
8	ACTIVE      org.springframework.bundle.spring.aop_2.5.4
9	ACTIVE      org.springframework.osgi.aopalliance.osgi_1.0.0.SNAPSHOT
10	ACTIVE      org.springframework.bundle.osgi.core_1.1.0.m2
12	ACTIVE      slf4j.api_1.4.3
13	ACTIVE      slf4j.log4j12_1.4.3
14	ACTIVE      org.springframework.bundle.spring.core_2.5.4
15	ACTIVE      org.springframework.bundle.spring.context.support_2.5.4
16	ACTIVE      org.apache.commons.logging_1.0.4.v200706111724
 
osgi>


OK，这样我们的Spring-OSGi的环境就启动好了，现在先关闭它。我们来建立一个Plug-in Project，命名为：PublishServiceDemo。

首先新建一个接口：com.demo.MyService，代码如下： 
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package com.demo;
 
public interface MyService
{
    public String getName();
}


接下来创建一个接口实现：com.demo.MyServiceImpl，代码如下： 
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package com.demo.impl;
 
import com.demo.MyService;
 
public class MyServiceImpl implements MyService
{
    public MyServiceImpl()
    {
        System.out.println("Create MyServiceImpl.");
    }
    public String getName()
    {
        return "this is MyService";
    }
}


在Plug-in ManiFest Editor中打开META-INF/MANIFEST.MF，如果安装了PDE，将会默认使用Plug-in ManiFest Editor打开。在Runtime标签中的Exported Packages中添加com.demo包，此时MANIFEST.MF文件中的内容如下： 
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Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: PublishServiceDemo Plug-in
Bundle-SymbolicName: PublishServiceDemo
Bundle-Version: 1.0.0
Export-Package: com.demo
 


注意：手工写MANIFEST.MF文件时，最后一行一定要有一个回车。

接下来我们要写Spring-OSGi的发布配置文件。在META-INF下建立文件夹并命名为：spring，然后新建一个xml文件：myservice.xml，文件内容如下： 
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<?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"
  xmlns:beans="http://www.springframework.org/schema/beans"
  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="myServiceOsgi" ref="myService" interface="com.demo.MyService"/>
 
    <bean name="myService" class="com.demo.impl.MyServiceImpl"/>
    
</beans>

注意：如果使用1.4的JDK，这里会出现讨厌的不支持xsd的验证错误，所以，请使用1.5以上的JDK，我使用的JDK是1.5的。

OK，我们现在完成了第一个通过Spring-OSGi的发布服务的Bundle。再次打开Open Run Dialog…，选择我们建立的SpringOSGiDemo的OSGi Framework的环境，在Bundles标签中选中我们的PublishServiceDemo，依次点击Apply，Run。
在Console中，会显示如下日志： 
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osgi> 2008-6-24 2:14:05 org.springframework.osgi.extender.internal.activator.ContextLoaderListener start
信息: Starting [org.springframework.bundle.osgi.extender] bundle v.[1.1.0.m2]
2008-6-24 2:14:05 org.springframework.osgi.extender.internal.support.ExtenderConfiguration <init>
信息: No custom configuration detected; using defaults
2008-6-24 2:14:05 org.springframework.osgi.extender.internal.activator.ContextLoaderListener addDefaultPostProcessors
信息: Disabled automatic Spring-DM annotation processing; [ org.springframework.osgi.extender.annotation.auto.processing=null]
2008-6-24 2:14:05 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.osgi.context.support.OsgiBundleXmlApplicationContext@f6dc61: display name [OsgiBundleXmlApplicationContext(bundle=PublishServiceDemo, config=osgibundle:/META-INF/spring/*.xml)]; startup date [Tue Jun 24 02:14:05 CST 2008]; root of context hierarchy
2008-6-24 2:14:05 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from URL [bundleentry://42/META-INF/spring/myservice.xml]
2008-6-24 2:14:05 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
信息: Bean factory for application context [org.springframework.osgi.context.support.OsgiBundleXmlApplicationContext@f6dc61]: org.springframework.beans.factory.support.DefaultListableBeanFactory@bbf341
2008-6-24 2:14:05 org.springframework.osgi.extender.internal.dependencies.startup.DependencyWaiterApplicationContextExecutor stageOne
信息: No outstanding OSGi service dependencies, completing initialization for OsgiBundleXmlApplicationContext(bundle=PublishServiceDemo, config=osgibundle:/META-INF/spring/*.xml)
2008-6-24 2:14:05 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@bbf341: defining beans [myServiceOsgi,myService]; root of factory hierarchy
Create MyServiceImpl.
2008-6-24 2:14:05 org.springframework.osgi.service.exporter.support.OsgiServiceFactoryBean registerService
信息: Publishing service under classes [{com.demo.MyService}]
2008-6-24 2:14:05 org.springframework.osgi.context.support.AbstractOsgiBundleApplicationContext publishContextAsOsgiServiceIfNecessary
信息: Publishing application context as OSGi service with properties {org.springframework.context.service.name=PublishServiceDemo, Bundle-SymbolicName=PublishServiceDemo, Bundle-Version=1.0.0}

我们可以看到在打印出的日志中，倒数第五行是： Create MyServiceImpl. 这是我们在MyServiceImpl类中的构造函数里打印的语句，这说明了我们的服务实例被创建了。最后一行我们可以看到Spring-OSGi框架提示我们发布了OSGi Service。现在我们在命令行里输入：ss，将看到如下显示： 
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ss
 
Framework is launched.
 
id	State       Bundle
0	ACTIVE      org.eclipse.osgi_3.3.1.R33x_v20070828
1	ACTIVE      org.springframework.bundle.osgi.io_1.1.0.m2
2	ACTIVE      org.springframework.bundle.osgi.extender_1.1.0.m2
3	ACTIVE      org.springframework.osgi.log4j.osgi_1.2.15.SNAPSHOT
4	ACTIVE      org.springframework.bundle.spring.beans_2.5.4
5	ACTIVE      org.springframework.bundle.spring.context_2.5.4
6	ACTIVE      org.springframework.osgi.servlet-api.osgi_2.5.0.SNAPSHOT
7	ACTIVE      org.springframework.osgi.backport-util-concurrent.osgi_3.1.0.SNAPSHOT
8	ACTIVE      org.springframework.bundle.spring.aop_2.5.4
9	ACTIVE      org.springframework.osgi.aopalliance.osgi_1.0.0.SNAPSHOT
10	ACTIVE      org.springframework.bundle.osgi.core_1.1.0.m2
12	ACTIVE      slf4j.api_1.4.3
13	ACTIVE      slf4j.log4j12_1.4.3
14	ACTIVE      org.springframework.bundle.spring.core_2.5.4
15	ACTIVE      org.springframework.bundle.spring.context.support_2.5.4
16	ACTIVE      org.apache.commons.logging_1.0.4.v200706111724
42	ACTIVE      PublishServiceDemo_1.0.0
 
osgi>


我们可以看到，这里编号为42的Bundle是我们刚刚建立的PublishServiceDemo。那么我们的服务发布到OSGi环境中了么？再次在osgi>提示符后输入命令：bundle 42，将显示如下结果： 
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osgi> bundle 42
initial@reference:file:../../../../../../../../Documents/workspace/PublishServiceDemo/ [42]
  Id=42, Status=ACTIVE      Data Root=/Users/ttt/Documents/workspace/.metadata/.plugins/org.eclipse.pde.core/SpringOSGiFramework/org.eclipse.osgi/bundles/42/data
  Registered Services
    {com.demo.MyService}={org.springframework.osgi.bean.name=myService, Bundle-SymbolicName=PublishServiceDemo, Bundle-Version=1.0.0, service.id=23}
    {org.springframework.osgi.context.DelegatedExecutionOsgiBundleApplicationContext, org.springframework.osgi.context.ConfigurableOsgiBundleApplicationContext, org.springframework.context.ConfigurableApplicationContext, org.springframework.context.ApplicationContext, org.springframework.context.Lifecycle, org.springframework.beans.factory.ListableBeanFactory, org.springframework.beans.factory.HierarchicalBeanFactory, org.springframework.context.MessageSource, org.springframework.context.ApplicationEventPublisher, org.springframework.core.io.support.ResourcePatternResolver, org.springframework.beans.factory.BeanFactory, org.springframework.core.io.ResourceLoader, org.springframework.beans.factory.DisposableBean}={org.springframework.context.service.name=PublishServiceDemo, Bundle-SymbolicName=PublishServiceDemo, Bundle-Version=1.0.0, service.id=24}
  Services in use:
    {org.springframework.beans.factory.xml.NamespaceHandlerResolver}={service.id=21}
    {org.xml.sax.EntityResolver}={service.id=22}
  Exported packages
    com.demo; version="0.0.0"[exported]
  No imported packages
  No fragment bundles
  Named class space
    PublishServiceDemo; bundle-version="1.0.0"[provided]
  No required bundles
 
osgi>

可以看到，在Registered Services中有这样一句： 
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{com.demo.MyService}={org.springframework.osgi.bean.name=myService, Bundle-SymbolicName=PublishServiceDemo, Bundle-Version=1.0.0, service.id=23}

这说明，我们的服务成功的发布到OSGi环境中了。可以再输入命令status来查看所有发布的服务。

这是Spring-OSGi的第一个服务。很简单吧，不过通过测试发现，通过反复install和uninstall发布服务的Bundle，Spring-OSGi框架会报出ClassNotFoundException，看来Spring-OSGi的发布服务还是不能做到动态发布，这一点上还是Declarative Services更好一些。

下一次，我们来看看在OSGi框架中如何配置log4j。

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