telodendria/src/Db.c

140 lines
2.5 KiB
C

/*
* Copyright (C) 2022 Jordan Bancino <@jordan:bancino.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <Db.h>
#include <Memory.h>
#include <pthread.h>
struct Db
{
const char *dir;
size_t cacheSize;
size_t maxCache;
pthread_mutex_t lock;
HashMap *cache;
};
struct DbRef
{
HashMap *json;
pthread_mutex_t lock;
unsigned long ts;
char *file;
};
Db *
DbOpen(const char *dir, size_t cache)
{
Db *db;
if (!dir)
{
return NULL;
}
db = Malloc(sizeof(Db));
if (!db)
{
return NULL;
}
db->dir = dir;
db->maxCache = cache;
pthread_mutex_init(&db->lock, NULL);
if (db->maxCache)
{
db->cache = HashMapCreate();
if (!db->cache)
{
return NULL;
}
}
return db;
}
void
DbClose(Db * db)
{
if (!db)
{
return;
}
pthread_mutex_destroy(&db->lock);
HashMapFree(db->cache);
Free(db);
}
DbRef *
DbCreate(Db * db, char *prefix, char *key)
{
if (!db || !prefix || !key)
{
return NULL;
}
return NULL;
}
DbRef *
DbLock(Db * db, char *prefix, char *key)
{
if (!db || !prefix || !key)
{
return NULL;
}
pthread_mutex_lock(&db->lock);
pthread_mutex_unlock(&db->lock);
return NULL;
}
void
DbUnlock(Db * db, DbRef * ref)
{
if (!db || !ref)
{
return;
}
pthread_mutex_lock(&db->lock);
pthread_mutex_unlock(&db->lock);
return;
}
HashMap *
DbJson(DbRef * ref)
{
return ref ? ref->json : NULL;
}