Actor: User Application

Goal: Cancel a previous request

Description: Cancels a previous request and ignores future replies.

Preconditions:

1. The engine must be started.
2. The request must be sent.
3. The reply has not been received..

1. The engine cancels the request and ignores any replies.

Related Use Cases:

UC15.0 - Send Peer Request
UC16.0 - Send Peer Request Async

Notes and Issues:

None

Event Flow:

1. The application performs a request (see related use cases)
2. The application cancels the request.
3. The engine cancels the request and ignores any future reply.
4. The application performs any post-request cleanup (see related use cases).

UC17.1 Engine is not started

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

UC17.2 Request doesn't exist

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

UC17.3 Reply Already Received

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

Sequence Diagrams:

Revision History

Name	Date	Reason for Change	Version