OSGI系列 服务注册

之前一直都是在说在blueprint中怎么发布（注册）服务以及获取服务，现在就来说说怎么通过代码来发布（注册）我们的服务和获取服务的

前提，需要引入咱们OSGI环境的依赖包：

一、发布（注册）服务

1、首先，我们来创建咱们的服务接口以及实现

服务接口：IService1.java

服务接口：Service1.java

2、然后，写一个Activator类，该类专用来注册服务的

public class Activator {    protected static final Logger logger = LoggerFactory.getLogger(Activator.class);    private BundleContext bundleContext;    private Service1 service1;    private Service2 service2;    private ServiceRegistration serviceServiceRegistration;    public void start() {        Dictionary<String, String> properties = new Hashtable<>();        properties.put("service.exported.interfaces","*");        properties.put("service.exported.configs","service.rpc");        serviceServiceRegistration =  bundleContext.registerService(Service1.class.getName(), service1, properties);        serviceServiceRegistration =  bundleContext.registerService(Service2.class.getName(), service2, properties);        logger.info("Score core started");    }    public void stop() {        serviceServiceRegistration.unregister();    }    public void setBundleContext(BundleContext bundleContext) {        this.bundleContext = bundleContext;    }    public void setService1(Service1 service1) {        this.service1 = service1;    }    public void setService2(Service2 service2) {        this.service2 = service2;    }        }

二、获取服务

1、方式一（推荐）

ServiceTracker tracker = new ServiceTracker(context, Service1.class.getName(), null);tracker.open();Service1 service = (Service1) tracker.getService();if(service!=null)service.log(Service1.LOG_INFO,"ok");// 获取多个ServiceObject[] services = tracker.getServices();// 获取Service的数量int count = tracker.getTrackingCount();tracker.close();

2、方式二（最原始）

// 获取Service引用ServiceReference ref = context.getServiceReference(LogService.class.getName());if(ref!=null){// 获取Service实例Service1 service = (Service1) context.getService(ref);if (service != null) {// 调用Service方法service.log(Service1.LOG_INFO, "ok");// 释放Service，在此之后不应该再继续使用Service实例context.ungetService(ref);}}