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6039b729 | 1 | |
2 | /* | |
a553a5a3 | 3 | * $Id: CommRead.h,v 1.7 2006/08/07 02:28:22 robertc Exp $ |
6039b729 | 4 | * |
5 | * DEBUG: section 5 Comms | |
6 | * AUTHOR: Robert Collins <robertc@squid-cache.org> | |
7 | * | |
8 | * SQUID Web Proxy Cache http://www.squid-cache.org/ | |
9 | * ---------------------------------------------------------- | |
10 | * | |
11 | * Squid is the result of efforts by numerous individuals from | |
12 | * the Internet community; see the CONTRIBUTORS file for full | |
13 | * details. Many organizations have provided support for Squid's | |
14 | * development; see the SPONSORS file for full details. Squid is | |
15 | * Copyrighted (C) 2001 by the Regents of the University of | |
16 | * California; see the COPYRIGHT file for full details. Squid | |
17 | * incorporates software developed and/or copyrighted by other | |
18 | * sources; see the CREDITS file for full details. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License as published by | |
22 | * the Free Software Foundation; either version 2 of the License, or | |
23 | * (at your option) any later version. | |
24 | * | |
25 | * This program is distributed in the hope that it will be useful, | |
26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28 | * GNU General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU General Public License | |
31 | * along with this program; if not, write to the Free Software | |
32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
33 | * | |
34 | * | |
35 | * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org> | |
36 | */ | |
37 | ||
38 | #include "config.h" | |
39 | ||
40 | #ifndef COMMREAD_H | |
41 | #define COMMREAD_H | |
42 | ||
43 | #include "squid.h" | |
a553a5a3 | 44 | #include "comm.h" |
6039b729 | 45 | #include "List.h" |
46 | ||
2d8c0b1a | 47 | template<class C> |
48 | ||
49 | class CallBack | |
50 | { | |
51 | ||
52 | public: | |
53 | CallBack() : handler(NULL), data(NULL){} | |
54 | ||
42d9b8e5 | 55 | CallBack(C *aHandler, void *someData) : handler(aHandler), data (NULL) |
56 | { | |
57 | if (someData) | |
58 | data = cbdataReference(someData); | |
59 | } | |
2d8c0b1a | 60 | |
42d9b8e5 | 61 | CallBack(CallBack const &old) : handler(old.handler) |
62 | { | |
63 | if (old.data) | |
64 | data = cbdataReference (old.data); | |
65 | else | |
66 | data = NULL; | |
67 | } | |
68 | ||
69 | ~CallBack() | |
70 | { | |
9a91f4b1 | 71 | replaceData (NULL); |
42d9b8e5 | 72 | } |
73 | ||
74 | CallBack &operator = (CallBack const & rhs) | |
75 | { | |
76 | handler = rhs.handler; | |
77 | ||
9a91f4b1 | 78 | replaceData (rhs.data); |
42d9b8e5 | 79 | |
80 | return *this; | |
81 | } | |
82 | ||
85a56f15 | 83 | bool dataValid() |
84 | { | |
85 | return cbdataReferenceValid(data); | |
86 | } | |
42d9b8e5 | 87 | |
9a91f4b1 | 88 | bool operator == (CallBack const &rhs) { return handler==rhs.handler && data==rhs.data;} |
2d8c0b1a | 89 | |
90 | #if 0 | |
91 | // twould be nice - RBC 20030307 | |
92 | C callback; | |
93 | #endif | |
94 | ||
95 | C *handler; | |
96 | void *data; | |
9a91f4b1 | 97 | |
98 | private: | |
99 | void replaceData(void *someData) | |
100 | { | |
101 | void *temp = NULL; | |
102 | ||
103 | if (someData) | |
104 | temp = cbdataReference(someData); | |
105 | ||
106 | if (data) | |
107 | cbdataReferenceDone(data); | |
108 | ||
109 | data = temp; | |
110 | } | |
2d8c0b1a | 111 | }; |
112 | ||
113 | #if 0 | |
114 | // twould be nice - RBC 20030307 | |
115 | void | |
116 | CallBack<IOCB>::callback(int fd, char *buf, size_t size , comm_err_t errcode, int xerrno, void *tempData) | |
117 | { | |
118 | assert (tempData == data); | |
119 | handler (fd, buf, size , errcode, xerrno, data); | |
120 | *this = CallBack(); | |
121 | } | |
122 | ||
123 | #endif | |
124 | ||
6039b729 | 125 | class CommRead |
126 | { | |
127 | ||
128 | public: | |
129 | CommRead (); | |
130 | CommRead (int fd, char *buf, int len, IOCB *handler, void *data); | |
2d8c0b1a | 131 | void queueCallback(size_t retval, comm_err_t errcode, int xerrno); |
132 | bool hasCallback() const; | |
133 | void hasCallbackInvariant() const; | |
134 | void hasNoCallbackInvariant() const; | |
135 | void tryReading(); | |
136 | void read(); | |
137 | void initiateActualRead(); | |
138 | void nullCallback(); | |
139 | void doCallback(comm_err_t errcode, int xerrno); | |
6039b729 | 140 | int fd; |
141 | char *buf; | |
142 | int len; | |
2d8c0b1a | 143 | CallBack<IOCB> callback; |
144 | static void ReadTry(int fd, void *data); | |
6039b729 | 145 | }; |
146 | ||
147 | class DeferredRead | |
148 | { | |
149 | ||
150 | public: | |
151 | typedef void DeferrableRead(void *context, CommRead const &); | |
6039b729 | 152 | DeferredRead (); |
153 | DeferredRead (DeferrableRead *, void *, CommRead const &); | |
154 | void markCancelled(); | |
155 | DeferrableRead *theReader; | |
156 | void *theContext; | |
157 | CommRead theRead; | |
158 | bool cancelled; | |
159 | ||
160 | private: | |
6039b729 | 161 | }; |
162 | ||
163 | class DeferredReadManager | |
164 | { | |
165 | ||
166 | public: | |
167 | ~DeferredReadManager(); | |
168 | void delayRead(DeferredRead const &); | |
169 | void kickReads(int const count); | |
170 | ||
171 | private: | |
172 | static PF CloseHandler; | |
173 | static DeferredRead popHead(ListContainer<DeferredRead> &deferredReads); | |
174 | void kickARead(DeferredRead const &); | |
175 | void flushReads(); | |
176 | ListContainer<DeferredRead> deferredReads; | |
177 | }; | |
178 | ||
179 | ||
180 | #endif /* COMMREAD_H */ |