IDEA felix osgi项目搭建(2)--bundle间引用配置

最新推荐文章于 2023-11-26 23:14:20 发布

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本文详细介绍了在OSGi环境中如何通过bundle进行服务的注册与查找。包括在配置文件中定义服务接口，以及在Activator中实现服务的注册过程。同时，展示了如何使用服务引用查询并获取服务实例，进行跨bundle的服务调用。

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bundle 接口间使用

如bundle1 要导出接口
在配置文件中填写配置信息：
在这里插入图片描述

bundle2引用bundle1的service：
在这里插入图片描述

接口的使用

bundle1 接口：

public interface DictionaryService
{
    /**
     * Check for the existence of a word.
     * @param word the word to be checked.
     * @return true if the word is in the dictionary,
     *         false otherwise.
    **/
    public boolean checkWord(String word);
}

在Activator中注册

package tutorial.example1;
 /**
     * Implements BundleActivator.start(). Registers an
     * instance of a dictionary service using the bundle context;
     * attaches properties to the service that can be queried
     * when performing a service look-up.
     * @param context the framework context for the bundle.
    **/
    public void start(BundleContext context)
    {
        Hashtable<String, String> props = new Hashtable<String, String>();
        props.put("Language", "English");
        context.registerService(
            DictionaryService.class.getName(), new DictionaryImpl(), props);
    }

另一实现

package tutorial.example2;
 public void start(BundleContext context)
    {
        Hashtable<String, String> props = new Hashtable<String, String>();
        props.put("Language", "French");
        context.registerService(
            DictionaryService.class.getName(), new DictionaryImpl(), props);
    }

使用：

import tutorial.example2.service.DictionaryService;
public void start(BundleContext context) throws Exception
    {
        // Query for all service references matching any language.
        ServiceReference[] refs = context.getServiceReferences(
            DictionaryService.class.getName(), "(Language=*)");

        if (refs != null)
        {
            try
            {
                System.out.println("Enter a blank line to exit.");
                BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
                String word = "";

                // Loop endlessly.
                while (true)
                {
                    // Ask the user to enter a word.
                    System.out.print("Enter word: ");
                    word = in.readLine();

                    // If the user entered a blank line, then
                    // exit the loop.
                    if (word.length() == 0)
                    {
                        break;
                    }

                    // First, get a dictionary service and then check
                    // if the word is correct.
                    DictionaryService dictionary =
                        (DictionaryService) context.getService(refs[0]);
                    if (dictionary.checkWord(word))
                    {
                        System.out.println("Correct.");
                    }
                    else
                    {
                        System.out.println("Incorrect.");
                    }

                    // Unget the dictionary service.
                    context.ungetService(refs[0]);
                }
            } catch (IOException ex) { }
        }
        else
        {
            System.out.println("Couldn't find any dictionary service...");
        }
    }