When using injection, application code would generally not need to interact with the implementation classes. For example, it would receive a Datastore or Storage instance directly and never need to interact with any of the factory or ServiceOptions classes e.g.
class MyApp {
@Resource Datastore dataset;
@Inject Bucket data;
void doSomething() {
// just use dataset and data fields ...
}
}By separating the API classes that it would use into a separate jar, the user can avoid having a dependency on the implementation itself and on any of the libraries that the implementation happens to use.
When using injection, application code would generally not need to interact with the implementation classes. For example, it would receive a
DatastoreorStorageinstance directly and never need to interact with any of the factory orServiceOptionsclasses e.g.By separating the API classes that it would use into a separate jar, the user can avoid having a dependency on the implementation itself and on any of the libraries that the implementation happens to use.