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/*
This file is part of GNUnet
(C) 2006, 2009 Christian Grothoff (and other contributing authors)
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 2, 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 include/gnunet_datacache_lib.h
* @brief datacache is a simple, transient hash table
* of bounded size with content expiration.
* In contrast to the sqstore there is
* no prioritization, deletion or iteration.
* All of the data is discarded when the peer shuts down!
* @author Christian Grothoff
*/
#ifndef GNUNET_DATACACHE_LIB_H
#define GNUNET_DATACACHE_LIB_H
#include "gnunet_util_lib.h"
#include "gnunet_block_lib.h"
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
/**
* Handle to the cache.
*/
struct GNUNET_DATACACHE_Handle;
/**
* Create a data cache.
*
* @param cfg configuration to use
* @param section section in the configuration that contains our options
* @return handle to use to access the service
*/
struct GNUNET_DATACACHE_Handle *
GNUNET_DATACACHE_create (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *section);
/**
* Destroy a data cache (and free associated resources).
*
* @param h handle to the datastore
*/
void
GNUNET_DATACACHE_destroy (struct GNUNET_DATACACHE_Handle *h);
/**
* An iterator over a set of items stored in the datacache.
*
* @param cls closure
* @param exp when will the content expire?
* @param key key for the content
* @param size number of bytes in data
* @param data content stored
* @param type type of the content
* @return GNUNET_OK to continue iterating, GNUNET_SYSERR to abort
*/
typedef int (*GNUNET_DATACACHE_Iterator) (void *cls,
struct GNUNET_TIME_Absolute exp,
const GNUNET_HashCode * key,
size_t size, const char *data,
enum GNUNET_BLOCK_Type type);
/**
* Store an item in the datacache.
*
* @param h handle to the datacache
* @param key key to store data under
* @param size number of bytes in data
* @param data data to store
* @param type type of the value
* @param discard_time when to discard the value in any case
* @return GNUNET_OK on success, GNUNET_SYSERR on error (full, etc.)
*/
int
GNUNET_DATACACHE_put (struct GNUNET_DATACACHE_Handle *h,
const GNUNET_HashCode * key, size_t size,
const char *data, enum GNUNET_BLOCK_Type type,
struct GNUNET_TIME_Absolute discard_time);
/**
* Iterate over the results for a particular key
* in the datacache.
*
* @param h handle to the datacache
* @param key what to look up
* @param type entries of which type are relevant?
* @param iter maybe NULL (to just count)
* @param iter_cls closure for iter
* @return the number of results found
*/
unsigned int
GNUNET_DATACACHE_get (struct GNUNET_DATACACHE_Handle *h,
const GNUNET_HashCode * key, enum GNUNET_BLOCK_Type type,
GNUNET_DATACACHE_Iterator iter, void *iter_cls);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
/* end of gnunet_datacache_lib.h */
#endif
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