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121 lines
2.9 KiB
121 lines
2.9 KiB
/*
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* $Id$
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*
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* Copyright (C) 2001-2005 iptel.org
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* Copyright (C) 2006-2007 iptelorg GmbH
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*
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* This file is part of ser, a free SIP server.
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*
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* ser is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version
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*
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* For a license to use the ser software under conditions
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* other than those described here, or to purchase support for this
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* software, please contact iptel.org by e-mail at the following addresses:
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* info@iptel.org
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*
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* ser is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/** \ingroup DB_API
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* @{
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*/
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#include "db_pool.h"
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#include "../../dprint.h"
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#include <unistd.h>
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#include <string.h>
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SLIST_HEAD(db_pool_head, db_pool_entry);
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/* The global connection pool */
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struct db_pool_head db_pool = SLIST_HEAD_INITIALIZER(db_pool);
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int db_pool_entry_init(struct db_pool_entry *entry, void* free_func, db_uri_t* uri)
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{
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if (db_drv_init(&entry->drv_gen, free_func) < 0) return -1;
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SLIST_NEXT(entry, next) = NULL;
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entry->uri = uri;
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entry->ref = 1;
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return 0;
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}
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void db_pool_entry_free(struct db_pool_entry* entry)
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{
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db_drv_free(&entry->drv_gen);
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entry->uri = NULL;
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entry->ref = 0;
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}
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/*
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* Search the pool for a connection with
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* the URI equal to uri, NULL is returned
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* when no connection is found
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*/
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struct db_pool_entry* db_pool_get(db_uri_t* uri)
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{
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db_pool_entry_t* ptr;
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SLIST_FOREACH(ptr, &db_pool, next) {
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if (db_uri_cmp(ptr->uri, uri)) {
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ptr->ref++;
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return ptr;
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}
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}
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return 0;
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}
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/*
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* Insert a new connection into the pool
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*/
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void db_pool_put(db_pool_entry_t* entry)
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{
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SLIST_INSERT_HEAD(&db_pool, entry, next);
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}
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/*
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* Release connection from the pool, the function
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* would return 1 when if the connection is not
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* referenced anymore and thus can be closed and
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* deleted by the backend. The function returns
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* 0 if the connection should still be kept open
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* because some other module is still using it.
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* The function returns -1 if the connection is
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* not in the pool.
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*/
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int db_pool_remove(db_pool_entry_t* entry)
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{
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if (!entry) return -2;
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if (entry->ref > 1) {
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/* There are still other users, just
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* decrease the reference count and return
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*/
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DBG("db_pool_remove: Connection still kept in the pool\n");
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entry->ref--;
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return 0;
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}
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DBG("db_pool_remove: Removing connection from the pool\n");
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SLIST_REMOVE(&db_pool, entry, db_pool_entry, next);
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return 1;
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}
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/** @} */
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