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Service
Object[] 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);
}
}