*/
    void onCancel(@Nullable Runnable handler);

    /**
     * Dispatches a daemon unavailable message to the client.
     */
    void daemonUnavailable(DaemonUnavailable unavailable);

    /**
     * Dispatches a build started message to the client.
     */
    void buildStarted(BuildStarted buildStarted);

    /**
     * Dispatches a log event message to the client.