1/*-
2 * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#ifndef __NSCD_AGENT_H__
28#define __NSCD_AGENT_H__
29
30/*
31 * Agents are used to perform the actual lookups from the caching daemon.
32 * There are two types of daemons: for common requests and for multipart
33 * requests.
34 * All agents are stored in the agents table, which is the singleton.
35 */
36
37enum agent_type {
38    COMMON_AGENT = 0,
39    MULTIPART_AGENT = 1
40};
41
42struct agent {
43   	char	*name;
44    	enum agent_type type;
45};
46
47struct common_agent {
48    	struct agent	parent;
49	int (*lookup_func)(const char *, size_t, char **, size_t *);
50};
51
52struct multipart_agent {
53    	struct agent	parent;
54	void *(*mp_init_func)(void);
55    	int (*mp_lookup_func)(char **, size_t *, void *);
56	void (*mp_destroy_func)(void *);
57};
58
59struct agent_table {
60   	struct agent	**agents;
61	size_t		agents_num;
62};
63
64struct agent_table *init_agent_table(void);
65void register_agent(struct agent_table *, struct agent *);
66struct agent *find_agent(struct agent_table *, const char *, enum agent_type);
67void destroy_agent_table(struct agent_table *);
68
69#endif
70