fetch-negotiator.h

   1 #ifndef FETCH_NEGOTIATOR
   2 #define FETCH_NEGOTIATOR
   3
   4 struct commit;
   5
   6 /*
   7  * An object that supplies the information needed to negotiate the contents of
   8  * the to-be-sent packfile during a fetch.
   9  *
  10  * To set up the negotiator, call fetch_negotiator_init(), then known_common()
  11  * (0 or more times), then add_tip() (0 or more times).
  12  *
  13  * Then, when "have" lines are required, call next(). Call ack() to report what
  14  * the server tells us.
  15  *
  16  * Once negotiation is done, call release(). The negotiator then cannot be used
  17  * (unless reinitialized with fetch_negotiator_init()).
  18  */
  19 struct fetch_negotiator {
  20         /*
  21          * Before negotiation starts, indicate that the server is known to have
  22          * this commit.
  23          */
  24         void (*known_common)(struct fetch_negotiator *, struct commit *);
  25
  26         /*
  27          * Once this function is invoked, known_common() cannot be invoked any
  28          * more.
  29          *
  30          * Indicate that this commit and all its ancestors are to be checked
  31          * for commonality with the server.
  32          */
  33         void (*add_tip)(struct fetch_negotiator *, struct commit *);
  34
  35         /*
  36          * Once this function is invoked, known_common() and add_tip() cannot
  37          * be invoked any more.
  38          *
  39          * Return the next commit that the client should send as a "have" line.
  40          */
  41         const struct object_id *(*next)(struct fetch_negotiator *);
  42
  43         /*
  44          * Inform the negotiator that the server has the given commit. This
  45          * method must only be called on commits returned by next().
  46          */
  47         int (*ack)(struct fetch_negotiator *, struct commit *);
  48
  49         void (*release)(struct fetch_negotiator *);
  50
  51         /* internal use */
  52         void *data;
  53 };
  54
  55 void fetch_negotiator_init(struct fetch_negotiator *negotiator,
  56                            const char *algorithm);
  57
  58 #endif