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/*
This file is part of GNUnet.
(C)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file rps/gnunet-service-rps_sampler.h
* @brief sampler implementation
* @author Julius Bünger
*/
#ifndef RPS_SAMPLER_H
#define RPS_SAMPLER_H
#include <inttypes.h>
/**
* Callback that is called when a new PeerID is inserted into a sampler.
*
* @param cls the closure given alongside this function.
* @param id the PeerID that is inserted
*/
typedef void
(*RPS_sampler_insert_cb) (void *cls,
const struct GNUNET_PeerIdentity *id);
/**
* Callback that is called when a new PeerID is removed from a sampler.
*
* @param cls the closure given alongside this function.
* @param id the PeerID that is removed
*/
typedef void
(*RPS_sampler_remove_cb) (void *cls,
const struct GNUNET_PeerIdentity *id);
/**
* Callback that is called from _get_n_rand_peers() when the PeerIDs are ready.
*
* @param cls the closure given alongside this function.
* @param ids the PeerIDs that were returned
* to be freed
*/
typedef void
(*RPS_sampler_n_rand_peers_ready_cb) (void *cls,
struct GNUNET_PeerIdentity *ids, uint32_t num_peers);
/**
* A sampler sampling a stream of PeerIDs.
*/
//struct RPS_Sampler;
/**
* Grow or shrink the size of the sampler.
*
* @param new_size the new size of the sampler
*/
void
RPS_sampler_resize (unsigned int new_size);
/**
* Initialise a tuple of samplers.
*
* @param init_size the size the sampler is initialised with
* @param id with which all newly created sampler elements are initialised
* @param ins_cb the callback that will be called on every PeerID that is
* newly inserted into a sampler element
* @param ins_cls the closure given to #ins_cb
* @param rem_cb the callback that will be called on every PeerID that is
* removed from a sampler element
* @param rem_cls the closure given to #rem_cb
*/
void
RPS_sampler_init (size_t init_size,
struct GNUNET_TIME_Relative max_round_interval,
RPS_sampler_insert_cb ins_cb, void *ins_cls,
RPS_sampler_remove_cb rem_cb, void *rem_cls);
/**
* A fuction to update every sampler in the given list
*
* @param id the PeerID that is put in the sampler
*/
void
RPS_sampler_update_list (const struct GNUNET_PeerIdentity *id);
/**
* Reinitialise all previously initialised sampler elements with the given value.
*
* Used to get rid of a PeerID.
*
* @param id the id of the samplers to update.
*/
void
RPS_sampler_reinitialise_by_value (const struct GNUNET_PeerIdentity *id);
/**
* Get n random peers out of the sampled peers.
*
* We might want to reinitialise this sampler after giving the
* corrsponding peer to the client.
* Random with or without consumption?
*
* @param cb callback that will be called once the ids are ready.
* @param cls closure given to @a cb
* @param for_client #GNUNET_YES if result is used for client,
* #GNUNET_NO if used internally
* @param num_peers the number of peers requested
*/
void
RPS_sampler_get_n_rand_peers (RPS_sampler_n_rand_peers_ready_cb cb,
void *cls, uint32_t num_peers, int for_client);
/**
* Counts how many Samplers currently hold a given PeerID.
*
* @param id the PeerID to count.
*
* @return the number of occurrences of id.
*/
uint32_t
RPS_sampler_count_id (const struct GNUNET_PeerIdentity *id);
/**
* Cleans the samplers.
*/
void
RPS_sampler_destroy ();
#endif
/* end of gnunet-service-rps.c */
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