该定制服务工厂类应该实现 OSGi ServiceFactory 接口。
The custom service factory class should implement the OSGi ServiceFactory interface.
实现了在定制服务接口中声明的方法的类。
Classes that implement the methods declared in custom service interfaces.
Developer应该为每个定制服务提供一个接口类和实现类。
Developer should provide an interface class and implementation class for each custom service.
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