/Users/yzchen/ns/ns-allinone-2.33/ns-2.33/queue/rtqueue.h

/* -*- c++ -*-
   $Id: rtqueue.h,v 1.4 2001/08/15 18:35:00 kclan Exp $
*/

#ifndef __ifqueue_h__
#define __ifqueue_h__

#include <packet.h>
#include <agent.h>

/*
 * The maximum number of packets that we allow a routing protocol to buffer.
 */
#define RTQ_MAX_LEN     64      // packets

/*
 *  The maximum period of time that a routing protocol is allowed to buffer
 *  a packet for.
 */
#define RTQ_TIMEOUT     30      // seconds

class rtqueue : public Connector {
 public:
        rtqueue();

        void            recv(Packet *, Handler*) { abort(); }

        void            enque(Packet *p);

        inline int      command(int argc, const char * const* argv) 
          { return Connector::command(argc, argv); }

        /*
         *  Returns a packet from the head of the queue.
         */
        Packet*         deque(void);

        /*
         * Returns a packet for destination "D".
         */
        Packet*         deque(nsaddr_t dst);
  /*
   * Finds whether a packet with destination dst exists in the queue
   */
        char            find(nsaddr_t dst);

 private:
        Packet*         remove_head();
        void            purge(void);
        void            findPacketWithDst(nsaddr_t dst, Packet*& p, Packet*& prev);
        void            verifyQueue(void);

        Packet          *head_;
        Packet          *tail_;

        int             len_;

        int             limit_;
        double          timeout_;

};

#endif /* __ifqueue_h__ */