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/*
* $Id: db_pool.c,v 1.1 2005/06/16 12:07:08 miconda Exp $
*
* Copyright (C) 2001-2005 iptel.org
*
* This file is part of openser, a free SIP server.
*
* openser 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 of the License, or
* (at your option) any later version
*
* openser 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "../dprint.h"
#include "db_pool.h"
/* The head of the pool */
static struct pool_con* db_pool = 0;
/*
* Search the pool for a connection with
* the identifier equal to id, NULL is returned
* when no connection is found
*/
struct pool_con* pool_get(struct db_id* id)
{
struct pool_con* ptr;
if (!id) {
LOG(L_ERR, "pool_get: Invalid parameter value\n");
return 0;
}
ptr = db_pool;
while (ptr) {
if (cmp_db_id(id, ptr->id)) {
ptr->ref++;
return ptr;
}
ptr = ptr->next;
}
return 0;
}
/*
* Insert a new connection into the pool
*/
void pool_insert(struct pool_con* con)
{
if (!con) return;
con->next = db_pool;
db_pool = con;
}
/*
* Release connection from the pool, the function
* would return 1 when if the connection is not
* referenced anymore and thus can be closed and
* deleted by the backend. The function returns
* 0 if the connection should still be kept open
* because some other module is still using it.
* The function returns -1 if the connection is
* not in the pool.
*/
int pool_remove(struct pool_con* con)
{
struct pool_con* ptr;
if (!con) return -2;
if (con->ref > 1) {
/* There are still other users, just
* decrease the reference count and return
*/
DBG("pool_remove: Connection still kept in the pool\n");
con->ref--;
return 0;
}
DBG("pool_remove: Removing connection from the pool\n");
if (db_pool == con) {
db_pool = db_pool->next;
} else {
ptr = db_pool;
while(ptr) {
if (ptr->next == con) break;
ptr = ptr->next;
}
if (!ptr) {
LOG(L_ERR, "pool_remove: Weird, connection not found in the pool\n");
return -1;
} else {
/* Remove the connection from the pool */
ptr->next = con->next;
}
}
return 1;
}
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