* @see org.apache.maven.project.DependencyResolutionRequest
     * @see org.apache.maven.project.DependencyResolutionResult
     * @see org.apache.maven.execution.ExecutionEvent
     * @see org.eclipse.aether.RepositoryEvent
     */
    void onEvent(Object event) throws Exception;

    /**
     * Notifies the spy of Maven's termination, allowing it to free any resources allocated by it.
     */
    void close() throws Exception;