Tornado is a simple web application on top of Apache Avalon SOA architecture. Therefore many core functions are implemented following avalon service standard. In course list project, the following services will be created. These services will be the implementation of business logic in course list project.

Each service is defined as an interface, implemented by a concrete class and configured in the SOA container. Two services exist in courselist project.

• com.cyclopsgroup.courselist.CourseListService
• com.cyclopsgroup.courselist.StudentService

CourseListService overview

Role	com.cyclopsgroup.courselist.CourseListService
Implementation	com.cyclopsgroup.courselist.impl.DefaultCourseListService
Description	Core course list management service

CourseListService functions

Method	Inputs	Returns	Description
registerCourse	String studentId, String courseId, boolean forced	Nothing	Register a course for student
findByCode	String prefix, String code	Course object	Find a course object with given prefix and code
findByTeacher	A teacher's ID	List of courses	Find courses related to a teacher
getAllCourses	Nothing	A list of all active courses	Get all active courses
getAllTeachers	Nothing	List of teacher objects	Get all teachers

StudentService overview

Role	com.cyclopsgroup.courselist.StudentService
Implementation	com.cyclopsgroup.courselist.impl.DefaultStudentService
Description	Service to handle

StudentService functions

Method	Inputs	Returns	Description
addCourse	String studentId, String courseId	nothing	Add course for a student
dropCourse	String studentId, String courseId	Nothing	Drop an registered course for a student