| 摘要 |
A system and method are provided for discovering, in response to a request from a program for an application programming interface, an implementation of the interface that may not have been known when the program was loaded. A registry is maintained of interfaces (e.g., interface services or methods) known within the operating environment. Each known interface is associated with an implementation of the interface or other object (e.g., a class loader, a principal) associated with an implementation of the interface. When an interface not known in the registry is invoked by a program, a discovery process is initiated to create or retrieve an implementation of the interface, a class loader capable of creating such an implementation, a principal from which to create such a class loader, or other program object. An object located in one discovery process may, upon execution, cause another discovery process. A hierarchical set of contexts may be maintained to narrow or guide the scope of search for a suitable implementation. |
