如何使用aries蓝图将apache karaf软件包作为服务注入Web应用程序中? [英] How to inject apache karaf bundles as a service in the web application using aries blue print?

问题描述

我有servlet Web应用程序，并希望使用白羊座蓝图将apache karaf捆绑作为服务注入Web应用程序中.

I have servlet web application and want to inject apache karaf bundles as a service in the web application using aries blueprint.

以下是注入捆绑包的步骤:

These are the Steps followed for injecting the bundles:

1)在blueprint.xml中添加了具有ID和接口值的参考标记 示例代码在这里

1) added reference tag with id and interface values in the blueprint.xml sample code is here

<reference id="jsonStore" interface="com.test.test.jsonstore.service.JsonClientStore" />

2)添加了将ref属性作为参考ID的bean标记，该标记与我们在blueprint.xml文件中注入的内容捆绑在一起. 示例代码在这里

2) added bean tag with ref attribute as reference id, of bundles what we are injecting in the blueprint.xml file. sample code is here

<bean id="echo" class="com.test.test.core.jsonrequest.JsonServlet">
     <property name="jsonStore" ref="jsonStore"/>
   </bean>

3)blueprint.xml文件的位置作为context-param标记了web.xml. 示例代码在这里

3) blueprint.xml file location as context-param tag the web.xml. sample code is here

<context-param>
      <param-name>blueprintLocation</param-name>
      <param-value>OSGI-INF/blueprint/blueprint.xml</param-value>
    </context-param>

4)在web.xml中添加了listner类. 示例代码在这里

4) added listner class in the web.xml. sample code is here

<listener>
      <listener-class>org.apache.aries.blueprint.web.BlueprintContextListener</listener-class>
    </listener>

5)@Inject注释，用于将特定的bundle注入到servlet类中. 示例代码在这里

5) @Inject annotation for injecting the particular bundle in the servlet class. sample code is here

@Inject(ref="jsonStore")
    JsonClientStore jsonStore = null;

以下链接用于参考文档 http://aries.apache.org/modules/blueprintweb.html

The following link is for reference documentation http://aries.apache.org/modules/blueprintweb.html

仍然没有注入束，请有人可以帮忙吗?

Still the bundles are not injected please some one can help on this ?

如何将这些karaf软件包作为服务注入servlet应用程序?

how to inject these karaf bundles as a service to the servlet application?

推荐答案

我在不使用白羊座蓝图的情况下解决了上述问题.

I solved the above problem without using aries blueprint.

我在servlet中添加了以下方法来获取注入的包，我将把包名称作为serviceName参数发送到以下方法，这将发回所需的注入包服务，通过使用我将使用当前方法在该服务中.

The following method i added in the servlet to get injected bundles, i will send the bundle name as serviceName parameter to the below method, this will send back the required service of injected bundle, by using that i will use the methods present in that service.

private <T> T getService(Class<T> serviceName) {
        Bundle bundle = FrameworkUtil.getBundle(serviceName);
        if ( bundle == null ) {
            return null;
        }       
        BundleContext bundleContext = bundle.getBundleContext();
        ServiceReference serviceRef = bundleContext.getServiceReference(serviceName);  
        if (serviceRef == null)          
            return null;
        return (T) bundleContext.getService(serviceRef);
    }

这段代码解决了我的问题.

This code solved my problem.

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