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亲爱的天才程序员!我一直在使用 OSGI 框架,并试图在我的程序中应用声明式服务,但它在屏幕上什么也没打印。我的程序很简单,只有一个接口,一个类实现它,一个类作为客户端使用接口。

- 界面是:

package test.osdids.date;

public interface IDateService {
String getDate();
                              }

- 该类实现接口,因为服务是:

package test.osdids.date.service;

import java.util.Calendar;

import test.osdids.date.IDateService;

public class DateService implements IDateService {

@Override
public String getDate() {
    String date = Calendar.getInstance().getTime().toString();
    return date;
                        }

                                                  }

注册服务的 XML 是:

<?xml version="1.0" encoding="UTF-8"?>
<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0"
name="test.osdids.date.service">
<implementation class="test.osdids.date.service.DateService" />
<service>
    <provide interface="test.osdids.date.IDateService" />
</service>
</scr:component>

该服务的清单文件是:

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: TESTOSDIDSDATESERVICE
Bundle-SymbolicName: TESTOSDIDSDATESERVICE
Bundle-Version: 1.0.0.qualifier
Bundle-RequiredExecutionEnvironment: JavaSE-1.7
Service-Component: OSGI-INF/DateBridge.xml
Export-Package: test.osdids.date
Bundle-ActivationPolicy: lazy

- 现在,这是作为客户端使用服务并打印结果的类(该类位于其他插件项目中,与之前存储接口和实现类的插件项目不同) ):

package test.osdids.date.consumer;

import test.osdids.date.IDateService;

public class DateConsumer {
private IDateService dateService;

public synchronized void setService(IDateService dateService) {
    this.dateService = dateService;
    System.out
            .println("The Date Service has been registered successfully!");
    System.out.println("The current time is: " + dateService.getDate());

}

public synchronized void unsetService(IDateService dateService) {
    System.out
            .println("The Date Service has been unregistered successfully!");

}

public void activate() {
    System.out.println("Test again...");
    System.out.println("The current time is: " + dateService.getDate());

}

public void deactivate() {
    System.out.println("Stop the service!");
}

}

- 这是消费和绑定消费者类服务的XML文件:

<?xml version="1.0" encoding="UTF-8"?>
<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0"
 name="test.osdids.date.consumer" activate="activate"
 deactivate="deactivate" enabled="true"  immediate="true">
<implementation class="test.osdids.date.consumer.DateConsumer" />
<reference bind="setService" cardinality="1..1"
    interface="test.osdids.date.IDateService" name="IDateService" policy="static"
    unbind="unsetService" />
</scr:component>

- 这是清单文件:

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: TESTOSDIDSDATECONSUMER
Bundle-SymbolicName: TESTOSDIDSDATECONSUMER
Bundle-Version: 1.0.0.qualifier
Bundle-RequiredExecutionEnvironment: JavaSE-1.7
Require-Bundle: TESTOSDIDSDATESERVICE;bundle-version="1.0.0"
Service-Component: OSGI-INF/DateBridgeConsumer.xml
Import-Package: test.osdids.date
Bundle-ActivationPolicy: lazy

- 这是屏幕上的结果:

osgi> 

(没啥事儿)

  • 但是当我使用 jUnit 测试来测试 DateConsumer 类中的方法 activate() 时,它起作用了。但是,当我尝试通过 OSGI 框架运行插件项目时,什么也没有发生。

我希望有人知道这个问题并帮助我。提前非常感谢!

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1 回答 1

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我得到了答案,只需通过 Eclipse 框架(产品)启动捆绑消费者,而不是通过 OSGI 框架,那么捆绑就会顺利运行

于 2014-08-26T10:08:13.460 回答