osgi 学习系列（五）spring dm

Spring-OSGi默认加载解析META-INF/spring目录下的xml文件作为spring bean配置文件，也可通过在MANIFEST.MF中增加Spring-Context来指定spring bean配置文件。

把一个Spring bean发布为OSGi Service，只需在spring bean的xml中这么配置就行了：

<osgi:service id=”OSGi服务ID” ref=”需要发布为OSGi服务的spring bean” interface=”服务的接口”/>

要在Spring bean中引用OSGi Service，只需在spring bean的xml中这么配置：

<osgi:reference ref=”需要发布为OSGi服务的spring bean” interface=”服务接口” />

可以看出和ds中的配置基本是一致的，不过目前尚缺少对于policy这样的属性的配置，另外如要实现bind和unbind的设置，需要在osgi:reference的元素下增加osgi:listener的节点，例如：

<osgi:reference>

<osgi:listener ref=”引用了此service的spring bean”

bind-method=”服务可用时调用的方法”

unbind-method=”服务不可用时的调用的方法”/>

</osgi:reference>

这里bind-method和unbind-method的方法签名和在使用DS时稍有不同，这里bind-method和unbind-method的方法签名如下所示：

public void onBind(服务接口，Dictionary)

在上面ds的demo里把com.ferry.client bundle稍做改动，修改部分如下

增加一个类Tiny

public class Tiny implements CommandProvider{
	
	private IAbility ability;

	public void setAbility(IAbility ability) {
		this.ability = ability;
	}
	
	public void onBind(IAbility ability,Map properties){
		this.ability = ability;
	}
	
	public void onUnbind(IAbility ability,Map properties){
		this.ability = null;
	}

	public void _countTinyDamage(CommandInterpreter ci){
		if(ability!=null){
			ci.println(ability.getName()+":"+ability.ability(4));
		}else {
			ci.println("ability is null!");
		}
	}

	@Override
	public String getHelp() {
		return "\tcountDamage - Count the damage\n";
	}
}

对应的spring配置文件如下

<?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">   
    
    <bean id="tiny" class="com.ferry.hero.Tiny">
  		<property name="ability" ref="ability"/>
  	</bean>
  	
  	<osgi:reference id="ability" interface="com.ferry.ability.IAbility">
  		<osgi:listener ref="tiny" bind-method="onBind" unbind-method="onUnbind"></osgi:listener>
 	</osgi:reference>
    
    <osgi:service ref="tiny" interface="org.eclipse.osgi.framework.console.CommandProvider">
   </osgi:service>
</beans>

spring-dm也支持多服务提供，有list和set两种，配置如下

<osgi:list id="引用了此service的spring bean " interface="服务接口"/>

<osgi:setid="引用了此service的spring bean " interface="服务接口“/>

Hero改成spring-dm 多服务提供的list方式，代码如下

public class Hero implements CommandProvider{
	
	private List<IAbility> abilityList;
	
	public void setAbilityList(List<IAbility> abilityList) {
		this.abilityList = abilityList;
	}

	public void addAbility(IAbility ability) {
		abilityList.add(ability);
		System.out.println(ability.getName());
	}
	
	public void removeAbility(IAbility ability) {
		abilityList.remove(ability);
		System.out.println(ability.getName());
	}

	public void _countDamage(CommandInterpreter ci){
		if (abilityList!=null&&abilityList.size()!=0) {
			for (IAbility ability : abilityList) {
				ci.println(ability.getName()+":"+ability.ability(4));
			}
		}
	}

	@Override
	public String getHelp() {
		return "\tcountDamage - Count the damage\n";
	}
}

Hero对应的spring配置文件如下

<bean id="hero" class="com.ferry.hero.Hero">   
    	<property name="abilityList" ref="abilitys"></property>
</bean>   
     
<osgi:list id="abilitys" interface="com.ferry.ability.IAbility"></osgi:list>
    
<osgi:service ref="hero" interface="org.eclipse.osgi.framework.console.CommandProvider">
</osgi:service>

代码运行结果大家可以通过我提供的代码自己运行，这里就不截图了

用到的jar包

com.springsource.org.aopalliance-1.0.0.jar

jcl-over-slf4j-1.6.4.jar

logback-classic-1.0.0.jar

logback-core-1.0.0.jar

org.eclipse.equinox.ds_1.3.1.R37x_v20110701.jar

org.eclipse.equinox.util_1.0.300.v20110502.jar

org.eclipse.osgi.services_3.3.0.v20110513.jar

org.eclipse.osgi_3.7.2.v20120110-1415.jar

org.springframework.aop-2.5.6.SEC03.jar

org.springframework.beans-2.5.6.SEC03.jar

org.springframework.context-2.5.6.SEC03.jar

org.springframework.core-2.5.6.SEC03.jar

slf4j-api-1.6.4.jar

spring-osgi-core-1.2.1.jar

spring-osgi-extender-1.2.1.jar

spring-osgi-io-1.2.1.jar

spring-osgi-mock-1.2.1.jar

点击下载demo代码