运行OSGI Bundle项目

时间：2017-08-02 07:43:45

标签： eclipse osgi bundle osgi-bundle activator

我正在使用Eclipse IDE并尝试运行osgi bundle项目。我使用插件项目创建了2个包。

  1. CalculatorService（充当发布者）
  2. CalculatorClient（充当订阅者）

    3. 这是我的项目结构

    project structure

    当我尝试运行CalculatorService时，它执行正常并且服务处于活动状态。然后，CalculatorService为ACTIVE后，我会运行CalculatorClient。但它保持RESOLVED状态，而不是ACTIVE。

    Service status

    尽管无法获得CalculatorClient Bundle ACTIVE，我尝试启动该服务并获得如下gogo异常。

    gogo exception

    由于此异常表示我start()捆绑的CalculatorClient方法存在错误，我已将其附在此处。

    package calculatorclient;

import java.io.BufferedReader;
import java.io.InputStreamReader;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;

import calculatorservice.ICalculatorService;

public class CalculatorClient implements BundleActivator {

    ServiceReference servRef;
    private static BundleContext context;

    static BundleContext getContext() {
        return context;
    }

    /*
     * (non-Javadoc)
     * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
     */
    public void start(BundleContext bundleContext) throws Exception {
        CalculatorClient.context = bundleContext;
        System.out.println("Start calculate client service");
        servRef = context.getServiceReference(ICalculatorService.class.getName());
        ICalculatorService calc = (ICalculatorService)context.getService(servRef);

        //Print
        System.out.println("Enter Operator");
        BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
        String oper = br1.readLine();
        BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
        double no1 = Double.parseDouble(br2.readLine());
        BufferedReader br3 = new BufferedReader(new InputStreamReader(System.in));
        double no2 = Double.parseDouble(br3.readLine());

        System.out.print("Answer is ");
        calc.calculateService(oper, no1, no2);

    }

    /*
     * (non-Javadoc)
     * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
     */
    public void stop(BundleContext bundleContext) throws Exception {
        CalculatorClient.context = null;
        System.out.println("Good Bye !!!");
        context.ungetService(servRef);
    }

}

    CalculatorService包的激活器类 

    package calculatorservice;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;

public class CalculatorActivator implements BundleActivator {

    ServiceRegistration servReg;
    private static BundleContext context;

    static BundleContext getContext() {
        return context;
    }

    /*
     * (non-Javadoc)
     * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
     */
    public void start(BundleContext bundleContext) throws Exception {
        CalculatorActivator.context = bundleContext;
        ICalculatorService calc = new CalculatorServiceImpl();
        servReg = context.registerService(ICalculatorService.class.getName(), calc, null);
    }

    /*
     * (non-Javadoc)
     * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
     */
    public void stop(BundleContext bundleContext) throws Exception {
        CalculatorActivator.context = null;
        servReg.unregister();
    }

}

    CalculatorService MANIFEST.MF 

    Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: CalculatorService
Bundle-SymbolicName: CalculatorService
Bundle-Version: 1.0.0.qualifier
Bundle-Activator: calculatorservice.CalculatorActivator
Bundle-RequiredExecutionEnvironment: JavaSE-1.8
Import-Package: org.osgi.framework;version="1.3.0"
Bundle-ActivationPolicy: lazy
Export-Package: calculatorservice

    CalculatorClient MANIFEST.MF 

    Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: CalculatorClient
Bundle-SymbolicName: CalculatorClient
Bundle-Version: 1.0.0.qualifier
Bundle-Activator: calculatorclient.CalculatorClient
Bundle-RequiredExecutionEnvironment: JavaSE-1.8
Import-Package: calculatorservice, org.osgi.framework;version="1.3.0"
Bundle-ActivationPolicy: lazy

    堆栈跟踪 

    !STACK 0
org.osgi.framework.BundleException: Could not resolve module: org.sonatype.m2e.mavenarchiver [1674]
  Unresolved requirement: Require-Bundle: org.eclipse.m2e.jdt; bundle-version="[1.0.0,2.0.0)"
    -> Bundle-SymbolicName: org.eclipse.m2e.jdt; bundle-version="1.6.2.20150902-0002"; singleton:="true"
       org.eclipse.m2e.jdt [1376]
         Unresolved requirement: Require-Bundle: org.eclipse.m2e.core; bundle-version="[1.6.0,1.7.0)"
           -> Bundle-SymbolicName: org.eclipse.m2e.core; bundle-version="1.6.2.20150902-0002"; singleton:="true"
              org.eclipse.m2e.core [1371]
                Unresolved requirement: Require-Bundle: org.eclipse.m2e.workspace.cli; bundle-version="0.1.0"

    at org.eclipse.osgi.container.Module.start(Module.java:434)
    at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1582)
    at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1562)
    at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1533)
    at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1476)
    at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1)
    at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
    at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)

    有关我无法将此CalculatorClient捆绑包从RESOLVED状态转变为ACTIVE状态的任何建议，我们将非常感谢。

1 个答案:

答案 0 :(得分：0)

我对两个Activator类进行了一些小修改。

  • 我不是使用start()和stop()方法中声明的bundle上下文实例，而是使用了start()和stop()方法中的bundlecontext对象参数

  • 在@Override和start()方法之前添加stop()注释。

  • 在实现发布者包中的接口的类中，在方法声明之前添加@Override注释。

  • 从Activator类中删除项目初始化期间创建的任何不必要的默认声明。

发布商的激活类 

package calculatorservice;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;

public class CalculatorActivator implements BundleActivator {

    ServiceRegistration serviceRegistration;

    @Override
    public void start(BundleContext bundleContext) throws Exception {
        ICalculatorService iCalculatorService = new CalculatorServiceImpl();
        serviceRegistration = bundleContext.registerService(ICalculatorService.class.getName(), iCalculatorService, null);
    }

    @Override
    public void stop(BundleContext bundleContext) throws Exception {
        serviceRegistration.unregister();
    }

}

发布商的实施类 

package calculatorservice;

public class CalculatorServiceImpl implements ICalculatorService{
    @Override
    public void calculateService(String operator, double no1, double no2){
        String PLUS = "+";
        String MINUS = "-";
        String MUL = "*";
        String DIV = "/";
        if(PLUS.equals(operator))
        {
            System.out.print((no1+no2));
        }
        else if (MINUS.equals(operator)){
            System.out.println((no1-no2));
        }
        else if (MUL.equals(operator)){
            System.out.print((no1*no2));
        }
        else if(DIV.equals(operator)){
            if(no2 == 0.0){
                System.out.print(" \"Divide by zeo error \" ");
            }
            else{
                System.out.print((no1/no2));
            }
        }
        else if (operator == ""){
            System.out.print(" \"Enter value for operator\" ");
        }
        else{
            System.out.print(" \"Enter one of the operators +_*/ \" ");
        }
    }
}

客户的激活类 

package calculatorclient;

import java.io.BufferedReader;
import java.io.InputStreamReader;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;

import calculatorservice.ICalculatorService;

public class CalculatorClient implements BundleActivator {

    ServiceReference serviceReference;

    @Override
    public void start(BundleContext bundleContext) throws Exception {
        System.out.println("Start calculate client Service");
        serviceReference = bundleContext.getServiceReference(ICalculatorService.class.getName());
        ICalculatorService iCalculatorService = (ICalculatorService)bundleContext.getService(serviceReference);

        System.out.println("Enter operator");
        BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
        String operator = br1.readLine();

        System.out.println("Enter no1 = ");
        BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
        double no1 = Double.parseDouble(br2.readLine());

        System.out.println("Enter no2 = ");
        BufferedReader br3 = new BufferedReader(new InputStreamReader(System.in));
        double no2 = Double.parseDouble(br3.readLine());

        iCalculatorService.calculateService(operator,no1,no2);
    }

    @Override
    public void stop(BundleContext bundleContext) throws Exception {
        System.out.println("Good Bye!!!");
        bundleContext.ungetService(serviceReference);       
    }

}

然后我分别启动了发布商MANIFEST.MF。在ACTIVE之后，我启动了客户MANIFEST.MF。一旦这两个都ACTIVE启动客户端服务，程序就可以正常运行。

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