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 37 enum agent_type { 38 COMMON_AGENT = 0, 39 MULTIPART_AGENT = 1 40 }; 41 42 struct agent { 43 char *name; 44 enum agent_type type; 45 }; 46 47 struct common_agent { 48 struct agent parent; 49 int (*lookup_func)(const char *, size_t, char **, size_t *); 50 }; 51 52 struct 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 59 struct agent_table { 60 struct agent **agents; 61 size_t agents_num; 62 }; 63 64 struct agent_table *init_agent_table(void); 65 void register_agent(struct agent_table *, struct agent *); 66 struct agent *find_agent(struct agent_table *, const char *, enum agent_type); 67 void destroy_agent_table(struct agent_table *); 68 69 #endif 70