DataLinkServer

Abort CheckDataLink Init StartDataLink StopDataLink

Attributes

Driver LocalIPAddress UseCount

Fields

Define Class DataLinkServer;
    inherits from PDUServer;
    inherits from PDUServiceInterface;
    abstract;

    field driver: Object, weak, getter, setter;         
        // underlying driver (serial/packet/etc. server)
    field localIPAddress: Unsigned, getter, setter;     
        // our IP address
    field useCount: Unsigned, getter, setter;           
        // current use count (NYI)

    // client-visible attributes
    attribute Driver: Object;
    attribute LocalIPAddress: Unsigned;
    attribute UseCount: Unsigned;

    // connection control operations
    operation StartDataLink(wantsStatus: Object), noMethod;
        // start up the data link; if 'wantsStatus' is not nil, it represents
        // an object that wants to receive updates on the status of the
        // connection.  Usually this is a StatusAnnouncement object.
    operation StopDataLink(), noMethod;
    operation CheckDataLink(): Boolean;
        // returns Connected(Driver(self)) by default; subclasses have
        // the option of doing "real" work if their protocol supports
        // it (e.g. PPP can use LCP echo, but SLIP has no such
        // support).

    overrides Init;
    overrides Abort;
end class;