高老庄 — Fri, 22 Jan 2010 09:34:00 GMT

在��用osgi实现�?可以使用诸如install,start,stop�q�样的命令来��理bundle或者调用服�?有时我们可能��x��加一些自定义命��o.可以通过如下的步骤来实现
1.�~�写一个服务，实现如下的接�?/p>

1public interface CommandProvider {
2    /**
3     Answer a string (may be as many lines as you like) with help
4     texts that explain the command.
5     */
6    public String getHelp();
7
8}

如果惛_��义hello�Ҏ��,可以如下实现该接�?

import java.util.Dictionary;
import java.util.Properties;

import org.eclipse.osgi.framework.console.CommandInterpreter;
import org.eclipse.osgi.framework.console.CommandProvider;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
public class Activator implements BundleActivator,CommandProvider  {
    BundleContext bundleContext=null;
    public void start(BundleContext context) throws Exception {
        System.out.println("start" +context.getBundle().getLocation());
        bundleContext=context;
        context.registerService(CommandProvider.class.getName(), new AntherCommandProvider(), null);
        Dictionary dictionary=new Properties();
        dictionary.put(Constants.SERVICE_RANKING, 10);
        context.registerService(CommandProvider.class.getName(), this,dictionary);

    }

    public void stop(BundleContext context) throws Exception {
        System.out.println("end" +context.getBundle().getLocation());
    }

    public String getHelp() {
        return "you are using the help command";
    }

    public void _helloa(CommandInterpreter intp)
    {
        intp.println("helloa "+ this.getClass().getName());
    }

    public void _hello(CommandInterpreter intp) throws Exception {
        intp.println("hello " + this.getClass().getName());
    }
}

import org.eclipse.osgi.framework.console.CommandInterpreter;
import org.eclipse.osgi.framework.console.CommandProvider;

public class AntherCommandProvider implements CommandProvider {

    public void _hello(CommandInterpreter intp)
    {
        intp.println("hello "+ this.getClass().getName());
    }
    public String getHelp() {
        return null;
    }
}

其中,通过CommandInterpreter�c�d��的nextArgument()�Ҏ��可以�q�代出所有的命��o参数.
    2.注册服务
        如果不将该接口注册�ؓ服务�Q�这个hello命��o��不产生��M��作用.注册的服务名�U�必��L��org.eclipse.osgi.framework.console.CommandProvider.
       当系�l�中存在多个此接口的实现�?可以通过SERVICE_RANKING属性来军_��了命令执行的��序,既有最高值的服务��被优先执行.�q�种方式可以重蝲�pȝ��中已�l�存在的同名服务.
     3.执行命��o
    请仔�l�体会输出结�?br />

高老庄 2010-01-22 17:34 发表评论

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