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b9ae18aa | 1 | /* |
262a0e14 | 2 | * $Id$ |
b9ae18aa | 3 | * |
4 | * SQUID Web Proxy Cache http://www.squid-cache.org/ | |
5 | * ---------------------------------------------------------- | |
6 | * | |
7 | * Squid is the result of efforts by numerous individuals from | |
8 | * the Internet community; see the CONTRIBUTORS file for full | |
9 | * details. Many organizations have provided support for Squid's | |
10 | * development; see the SPONSORS file for full details. Squid is | |
11 | * Copyrighted (C) 2001 by the Regents of the University of | |
12 | * California; see the COPYRIGHT file for full details. Squid | |
13 | * incorporates software developed and/or copyrighted by other | |
14 | * sources; see the CREDITS file for full details. | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License as published by | |
18 | * the Free Software Foundation; either version 2 of the License, or | |
19 | * (at your option) any later version. | |
26ac0430 | 20 | * |
b9ae18aa | 21 | * This program is distributed in the hope that it will be useful, |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
26ac0430 | 25 | * |
b9ae18aa | 26 | * You should have received a copy of the GNU General Public License |
27 | * along with this program; if not, write to the Free Software | |
28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
29 | * | |
30 | * Copyright (c) 2003 Robert Collins <robertc@squid-cache.org> | |
31 | */ | |
32 | ||
33 | #ifndef SQUID_DISKIOSTRATEGY_H | |
34 | #define SQUID_DISKIOSTRATEGY_H | |
35 | ||
36 | #include "squid.h" | |
37 | ||
38 | #include "RefCount.h" | |
39 | ||
40 | class DiskFile; | |
41 | ||
42 | class ConfigOption; | |
43 | ||
44 | class DiskIOStrategy | |
45 | { | |
46 | ||
47 | public: | |
26ac0430 | 48 | virtual ~DiskIOStrategy() {} |
b9ae18aa | 49 | |
63be0a78 | 50 | /** Can the IO Strategy handle more requests ? */ |
b9ae18aa | 51 | virtual bool shedLoad() = 0; |
63be0a78 | 52 | |
53 | /** What is the current load? 999 = 99.9% */ | |
b9ae18aa | 54 | virtual int load() = 0; |
63be0a78 | 55 | |
56 | /** Return a handle for performing IO operations */ | |
57 | virtual RefCount<DiskFile> newFile(char const *path) = 0; | |
58 | ||
59 | /** flush all IO operations */ | |
b9ae18aa | 60 | virtual void sync() {} |
61 | ||
63be0a78 | 62 | /** unlink a file by path */ |
63 | virtual void unlinkFile(char const *) = 0; | |
b9ae18aa | 64 | |
63be0a78 | 65 | /** perform any pending callbacks */ |
b9ae18aa | 66 | virtual int callback() { return 0; } |
67 | ||
63be0a78 | 68 | /** Init per-instance logic */ |
b9ae18aa | 69 | virtual void init() {} |
70 | ||
63be0a78 | 71 | /** cachemgr output on the IO instance stats */ |
b9ae18aa | 72 | virtual void statfs(StoreEntry & sentry)const {} |
73 | ||
63be0a78 | 74 | /** module specific options */ |
b9ae18aa | 75 | virtual ConfigOption *getOptionTree() const { return NULL;} |
76 | }; | |
77 | ||
78 | /* Because we need the DiskFile definition for newFile. */ | |
79 | #include "DiskFile.h" | |
80 | ||
81 | class SingletonIOStrategy : public DiskIOStrategy | |
82 | { | |
83 | ||
84 | public: | |
26ac0430 | 85 | SingletonIOStrategy(DiskIOStrategy *anIO) : io(anIO) {} |
b9ae18aa | 86 | |
87 | virtual bool shedLoad() { return io->shedLoad(); } | |
88 | ||
89 | virtual int load() { return io->load(); } | |
90 | ||
91 | virtual RefCount<DiskFile> newFile (char const *path) {return io->newFile(path); } | |
92 | ||
93 | virtual void sync() { io->sync(); } | |
94 | ||
95 | virtual void unlinkFile (char const *path) { io->unlinkFile(path); } | |
96 | ||
97 | virtual int callback() { return io->callback(); } | |
98 | ||
99 | virtual void init() { io->init(); } | |
100 | ||
101 | virtual void statfs(StoreEntry & sentry)const { io->statfs(sentry); } | |
102 | ||
103 | virtual ConfigOption *getOptionTree() const { return io->getOptionTree(); } | |
104 | ||
105 | private: | |
106 | DiskIOStrategy *io; | |
107 | }; | |
108 | ||
109 | #endif /* SQUID_DISKIOSTRATEGY_H */ |