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/*
* $Id: flat_pool.c,v 1.1.1.1 2005/06/13 16:47:38 bogdan_iancu Exp $
*
* Flatstore module connection pool
*
* Copyright (C) 2004 FhG Fokus
*
* 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 <unistd.h>
#include "../../dprint.h"
#include "flat_pool.h"
#include "flat_id.h"
/* The head of the pool */
static struct flat_con* pool = 0;
/*
* Pid of the process that added the last
* connection to the pool. This is used to
* check for inherited database connections.
*/
static int pool_pid;
/*
* Get a connection from the pool, reuse existing
* if possible, otherwise create a new one
*/
struct flat_con* flat_get_connection(char* dir, char* table)
{
struct flat_id* id;
struct flat_con* ptr;
int pid;
if (!dir || !table) {
LOG(L_ERR, "flat_get_connection: Invalid parameter value\n");
return 0;
}
pid = getpid();
if (pool && (pool_pid != pid)) {
LOG(L_ERR, "flat_get_connection: Inherited open database connections, this is not a good idea\n");
return 0;
}
pool_pid = pid;
id = new_flat_id(dir, table);
if (!id) return 0;
ptr = pool;
while (ptr) {
if (cmp_flat_id(id, ptr->id)) {
DBG("flat_get_connection: Connection found in the pool\n");
ptr->ref++;
free_flat_id(id);
return ptr;
}
ptr = ptr->next;
}
DBG("flat_get_connection: Connection not found in the pool\n");
ptr = flat_new_connection(id);
if (!ptr) {
free_flat_id(id);
return 0;
}
ptr->next = pool;
pool = ptr;
return ptr;
}
/*
* Release a connection, the connection will be left
* in the pool if ref count != 0, otherwise it
* will be delete completely
*/
void flat_release_connection(struct flat_con* con)
{
struct flat_con* ptr;
if (!con) return;
if (con->ref > 1) {
/* There are still other users, just
* decrease the reference count and return
*/
DBG("flat_release_connection: Connection still kept in the pool\n");
con->ref--;
return;
}
DBG("flat_release_connection: Removing connection from the pool\n");
if (pool == con) {
pool = pool->next;
} else {
ptr = pool;
while(ptr) {
if (ptr->next == con) break;
ptr = ptr->next;
}
if (!ptr) {
LOG(L_ERR, "flat_release_connection: Weird, connection not found in the pool\n");
} else {
/* Remove the connection from the pool */
ptr->next = con->next;
}
}
flat_free_connection(con);
}
/*
* Close and reopen all opened connections
*/
int flat_rotate_logs(void)
{
struct flat_con* ptr;
ptr = pool;
while(ptr) {
if (flat_reopen_connection(ptr)) {
return -1;
}
ptr = ptr->next;
}
return 0;
}
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