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/* $OpenBSD: btree.h,v 1.6 2010/07/02 01:43:00 martinh Exp $ */
/*
* Copyright (c) 2009, 2010 Martin Hedenfalk <martin@bzero.se>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _btree_h_
#define _btree_h_
#include <openssl/sha.h>
struct mpage;
struct cursor;
struct btree_txn;
struct btval {
void *data;
size_t size;
int free_data; /* true if data malloc'd */
struct mpage *mp; /* ref'd memory page */
};
typedef int (*bt_cmp_func)(const struct btval *a,
const struct btval *b);
typedef void (*bt_prefix_func)(const struct btval *a,
const struct btval *b,
struct btval *sep);
#define BT_NOOVERWRITE 1
enum cursor_op { /* cursor operations */
BT_CURSOR, /* position at given key */
BT_CURSOR_EXACT, /* position at key, or fail */
BT_FIRST,
BT_NEXT,
BT_LAST, /* not implemented */
BT_PREV /* not implemented */
};
/* return codes */
#define BT_FAIL -1
#define BT_SUCCESS 0
/* btree flags */
#define BT_NOSYNC 0x02 /* don't fsync after commit */
#define BT_RDONLY 0x04 /* read only */
#define BT_REVERSEKEY 0x08 /* use reverse string keys */
struct btree_stat {
unsigned long long int hits; /* cache hits */
unsigned long long int reads; /* page reads */
unsigned int max_cache; /* max cached pages */
unsigned int cache_size; /* current cache size */
unsigned int branch_pages;
unsigned int leaf_pages;
unsigned int overflow_pages;
unsigned int revisions;
unsigned int depth;
unsigned long long int entries;
unsigned int psize;
time_t created_at;
};
struct btree *btree_open_fd(int fd, unsigned int flags);
struct btree *btree_open(const char *path, unsigned int flags,
mode_t mode);
void btree_close(struct btree *bt);
const struct btree_stat *btree_stat(struct btree *bt);
struct btree_txn *btree_txn_begin(struct btree *bt, int rdonly);
int btree_txn_commit(struct btree_txn *txn);
void btree_txn_abort(struct btree_txn *txn);
int btree_txn_get(struct btree *bt, struct btree_txn *txn,
struct btval *key, struct btval *data);
int btree_txn_put(struct btree *bt, struct btree_txn *txn,
struct btval *key, struct btval *data,
unsigned int flags);
int btree_txn_del(struct btree *bt, struct btree_txn *txn,
struct btval *key, struct btval *data);
#define btree_get(bt, key, data) \
btree_txn_get(bt, NULL, key, data)
#define btree_put(bt, key, data, flags) \
btree_txn_put(bt, NULL, key, data, flags)
#define btree_del(bt, key, data) \
btree_txn_del(bt, NULL, key, data)
void btree_set_cache_size(struct btree *bt,
unsigned int cache_size);
unsigned int btree_get_flags(struct btree *bt);
const char *btree_get_path(struct btree *bt);
#define btree_cursor_open(bt) \
btree_txn_cursor_open(bt, NULL)
struct cursor *btree_txn_cursor_open(struct btree *bt,
struct btree_txn *txn);
void btree_cursor_close(struct cursor *cursor);
int btree_cursor_get(struct cursor *cursor,
struct btval *key, struct btval *data,
enum cursor_op op);
int btree_sync(struct btree *bt);
int btree_compact(struct btree *bt);
int btree_revert(struct btree *bt);
int btree_cmp(struct btree *bt, const struct btval *a,
const struct btval *b);
void btval_reset(struct btval *btv);
#endif
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