Sub-Resources - Web Services Quiz - 10 questions

1.

What is sub-resource method?

The sub-resource methods are methods of a resource class that are annotated with @Path and one of the request method designators (@GET, @PUT, @POST or @DELETE).

2.

What is called sub-resource locator?

Sub-resource locators are methods that are annotated with @Path but without request method designator.

3.

Can sub-resource locators return sub-type?

@Path("exam")
public class ExamResource {

    @Path("/")
    public Object getSomeResource() {
        return new SomeResource();
    }
}

Yes.

4.

Is it possible to manage the life-cycle or inject any field on instances returned from sub-resource locator methods?

No.

5.

Change the example to make the runtime manages the sub-resources as standard resources.

@Path("/exams")
public class ExamResource {
    @Path("categories")
    public CategoryResource getCategoryResource() {
       // ....    
    }
}

@Singleton
public class CategoryResource {
    // ...
}

@Path("/exams")
public class ExamResource {
    @Path("categories")
    public Class<CategoryResource> getCategoryResource() {
        return CategoryResource.class;
    }
}

@Singleton
public class CategoryResource {
    //...
}

6.

Will the returned resource be managed as Singleton?

@Path("exams")
public class ExamResource {
    @Path("categories")
    public CategoryResource getCategoryResource() {
        return CategoryResource.class;
    }
}

@Singleton
public class CategoryResource {
    // 
}

No, if the method return instance of the class, the Singleton annotation have no effect and the returned instance is used.

7.

The difference between sub-resource methods and sub-resource locators.

Sub-resource locators don't have request method designator.

8.

Can sub-resource locators have the same parameters as resource methods?

They MUST NOT have an entity parameter.

9.

Which method is a sub-resource method?

@Path("exams")
public class ExamService {
   
    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String getExams() {
        ...
    }

    @GET
    @Path("/categories")
    @Produces(MediaType.TEXT_PLAIN)
    public String getCategories() {
        ...
    }
}

getCategories()

10.

What sub-resource locators are used for?

The sub-resource locators return an object that will handle an HTTP request.

Sub-Resources - Quiz