Actor: User Application

Goal: Join Peer Group

Description: Allows an application to join an existing group

Preconditions:

1. The engine must be started.

1. The engine is a member of the joined group.

Related Use Cases:

UC12.0 - Leave Peer Group
UC13.0 - Create Peer Group
UC14.0 - Delete Peer Group

Notes and Issues:

None

Event Flow:

1. The application requests the engine to join an existing group.
2. The engine sends a request to join an existing group.
3. The engine receives a response that the request to join an existing group succeeded.
4. The engine adds the group to its internal list of joined groups.
5. The engine informs the application that the join succeeded.

UC11.1 Engine is not started

1. The application requests the engine to join an existing group.
2. The engine returns an error that the it has not been started.

UC11.2 Missing or Invalid Credentials

1. The application requests the engine to join an existing group.
2. The engine sends a request to join an existing group.
3. The engine receives a response that the request to join an existing group failed.
4. The engine informs the application that the join failed due to missing or invalid credentials.

UC11.3 Group not found

1. The application requests the engine to join an existing group.
2. The engine sends a request to join an existing group.
3. The engine receives a response that the request to join an existing group failed.
4. The engine informs the application that the join failed due to an invalid group.

Sequence Diagrams:

Revision History

Name	Date	Reason for Change	Version