Actor: User Application

Goal: Cancel a reply.

Description: Cancel a reply.

Preconditions:

1. The engine must be started.
2. The reply transmission is not complete.
3. The reply to cancel must be valid.

None.

Priority: High

Related Use Cases:

UC15.0 - Send Peer Request
UC16.0 - Send Peer Request Async
UC17.0 - Cancel Peer Request
UC20.0 - Reply to Peer Request

Notes and Issues:

None

Event Flow:

1. The application asks the engine to cancel a reply sent to a peer.
2. The engine cancels the reply transmission
3. The engine removes the reply from its in progress list.

UC21.1 Engine is not started

1. The application asks the engine to cancel a reply message.
2. The engine returns an error that the it has not been started.

UC21.2 Reply doesn't exist

1. The application asks the engine to cancel a reply message.
2. The engine returns an error that the reply doesn't exist.

UC21.3 Reply Already Set

1. The application asks the engine to cancel a reply message.
2. The engine returns an error that the engine has already sent the reply.

Sequence Diagrams:

Revision History

Name	Date	Reason for Change	Version