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<div id="projectname">libdap++ <span id="projectnumber">Updated for version 3.8.2</span></div>
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<h1>HTTPCacheTable.cc</h1> </div>
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<a href="HTTPCacheTable_8cc.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00002"></a>00002 <span class="comment">// -*- mode: c++; c-basic-offset:4 -*-</span>
<a name="l00003"></a>00003
<a name="l00004"></a>00004 <span class="comment">// This file is part of libdap, A C++ implementation of the OPeNDAP Data</span>
<a name="l00005"></a>00005 <span class="comment">// Access Protocol.</span>
<a name="l00006"></a>00006
<a name="l00007"></a>00007 <span class="comment">// Copyright (c) 2002,2003 OPeNDAP, Inc.</span>
<a name="l00008"></a>00008 <span class="comment">// Author: James Gallagher <jgallagher@opendap.org></span>
<a name="l00009"></a>00009 <span class="comment">//</span>
<a name="l00010"></a>00010 <span class="comment">// This library is free software; you can redistribute it and/or</span>
<a name="l00011"></a>00011 <span class="comment">// modify it under the terms of the GNU Lesser General Public</span>
<a name="l00012"></a>00012 <span class="comment">// License as published by the Free Software Foundation; either</span>
<a name="l00013"></a>00013 <span class="comment">// version 2.1 of the License, or (at your option) any later version.</span>
<a name="l00014"></a>00014 <span class="comment">//</span>
<a name="l00015"></a>00015 <span class="comment">// This library is distributed in the hope that it will be useful,</span>
<a name="l00016"></a>00016 <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00017"></a>00017 <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00018"></a>00018 <span class="comment">// Lesser General Public License for more details.</span>
<a name="l00019"></a>00019 <span class="comment">//</span>
<a name="l00020"></a>00020 <span class="comment">// You should have received a copy of the GNU Lesser General Public</span>
<a name="l00021"></a>00021 <span class="comment">// License along with this library; if not, write to the Free Software</span>
<a name="l00022"></a>00022 <span class="comment">// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
<a name="l00023"></a>00023 <span class="comment">//</span>
<a name="l00024"></a>00024 <span class="comment">// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.</span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="config_8h.html">config.h</a>"</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="comment">//#define DODS_DEBUG</span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="comment">// TODO: Remove unneeded includes.</span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="preprocessor">#include <pthread.h></span>
<a name="l00033"></a>00033 <span class="preprocessor">#include <limits.h></span>
<a name="l00034"></a>00034 <span class="preprocessor">#include <unistd.h></span> <span class="comment">// for stat</span>
<a name="l00035"></a>00035 <span class="preprocessor">#include <sys/types.h></span> <span class="comment">// for stat and mkdir</span>
<a name="l00036"></a>00036 <span class="preprocessor">#include <sys/stat.h></span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="preprocessor">#include <cstring></span>
<a name="l00039"></a>00039 <span class="preprocessor">#include <iostream></span>
<a name="l00040"></a>00040 <span class="preprocessor">#include <sstream></span>
<a name="l00041"></a>00041 <span class="preprocessor">#include <algorithm></span>
<a name="l00042"></a>00042 <span class="preprocessor">#include <iterator></span>
<a name="l00043"></a>00043 <span class="preprocessor">#include <set></span>
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="preprocessor">#include "<a class="code" href="Error_8h.html">Error.h</a>"</span>
<a name="l00046"></a>00046 <span class="preprocessor">#include "<a class="code" href="InternalErr_8h.html">InternalErr.h</a>"</span>
<a name="l00047"></a>00047 <span class="preprocessor">#include "<a class="code" href="ResponseTooBigErr_8h.html">ResponseTooBigErr.h</a>"</span>
<a name="l00048"></a>00048 <span class="preprocessor">#ifndef WIN32</span>
<a name="l00049"></a>00049 <span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="SignalHandler_8h.html">SignalHandler.h</a>"</span>
<a name="l00050"></a>00050 <span class="preprocessor">#endif</span>
<a name="l00051"></a>00051 <span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="HTTPCacheInterruptHandler_8h.html">HTTPCacheInterruptHandler.h</a>"</span>
<a name="l00052"></a>00052 <span class="preprocessor">#include "<a class="code" href="HTTPCacheTable_8h.html">HTTPCacheTable.h</a>"</span>
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="preprocessor">#include "<a class="code" href="util__mit_8h.html">util_mit.h</a>"</span>
<a name="l00055"></a>00055 <span class="preprocessor">#include "<a class="code" href="debug_8h.html">debug.h</a>"</span>
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="preprocessor">#ifdef WIN32</span>
<a name="l00058"></a>00058 <span class="preprocessor"></span><span class="preprocessor">#include <direct.h></span>
<a name="l00059"></a>00059 <span class="preprocessor">#include <time.h></span>
<a name="l00060"></a>00060 <span class="preprocessor">#include <fcntl.h></span>
<a name="l00061"></a>00061 <span class="preprocessor">#define MKDIR(a,b) _mkdir((a))</span>
<a name="l00062"></a>00062 <span class="preprocessor"></span><span class="preprocessor">#define REMOVE(a) remove((a))</span>
<a name="l00063"></a>00063 <span class="preprocessor"></span><span class="preprocessor">#define MKSTEMP(a) _open(_mktemp((a)),_O_CREAT,_S_IREAD|_S_IWRITE)</span>
<a name="l00064"></a>00064 <span class="preprocessor"></span><span class="preprocessor">#define DIR_SEPARATOR_CHAR '\\'</span>
<a name="l00065"></a>00065 <span class="preprocessor"></span><span class="preprocessor">#define DIR_SEPARATOR_STR "\\"</span>
<a name="l00066"></a>00066 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00067"></a><a class="code" href="HTTPCacheTable_8cc.html#a2bf44344e285663ad0b0b7bb001ac4fd">00067</a> <span class="preprocessor"></span><span class="preprocessor">#define MKDIR(a,b) mkdir((a), (b))</span>
<a name="l00068"></a><a class="code" href="HTTPCacheTable_8cc.html#a2a6edcee170a79b132872d22066754ed">00068</a> <span class="preprocessor"></span><span class="preprocessor">#define REMOVE(a) remove((a))</span>
<a name="l00069"></a><a class="code" href="HTTPCacheTable_8cc.html#ae76603c1b2ef94cb2664dbad1b82a4c6">00069</a> <span class="preprocessor"></span><span class="preprocessor">#define MKSTEMP(a) mkstemp((a))</span>
<a name="l00070"></a><a class="code" href="HTTPCacheTable_8cc.html#a1d22fde6e7501aebedb7663f0b0aa4e2">00070</a> <span class="preprocessor"></span><span class="preprocessor">#define DIR_SEPARATOR_CHAR '/'</span>
<a name="l00071"></a><a class="code" href="HTTPCacheTable_8cc.html#a23e72ca2d8456a971c13441bdfc4586f">00071</a> <span class="preprocessor"></span><span class="preprocessor">#define DIR_SEPARATOR_STR "/"</span>
<a name="l00072"></a>00072 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00073"></a>00073 <span class="preprocessor"></span>
<a name="l00074"></a><a class="code" href="HTTPCacheTable_8cc.html#a9f34e7ee25eb923739b1ea126dce4528">00074</a> <span class="preprocessor">#define CACHE_META ".meta"</span>
<a name="l00075"></a><a class="code" href="HTTPCacheTable_8cc.html#a2fcbe1f1875c3c4b38a63ea99b906c49">00075</a> <span class="preprocessor"></span><span class="preprocessor">#define CACHE_INDEX ".index"</span>
<a name="l00076"></a><a class="code" href="HTTPCacheTable_8cc.html#a69b733628460a6923e506281cd95c43f">00076</a> <span class="preprocessor"></span><span class="preprocessor">#define CACHE_EMPTY_ETAG "@cache@"</span>
<a name="l00077"></a>00077 <span class="preprocessor"></span>
<a name="l00078"></a><a class="code" href="HTTPCacheTable_8cc.html#afefcb1315dce44b5c9459b8f0ad22cb7">00078</a> <span class="preprocessor">#define NO_LM_EXPIRATION 24*3600 // 24 hours</span>
<a name="l00079"></a><a class="code" href="HTTPCacheTable_8cc.html#aedf844327e904ce70cf4112a5d9fc334">00079</a> <span class="preprocessor"></span><span class="preprocessor">#define MAX_LM_EXPIRATION 48*3600 // Max expiration from LM</span>
<a name="l00080"></a>00080 <span class="preprocessor"></span>
<a name="l00081"></a>00081 <span class="comment">// If using LM to find the expiration then take 10% and no more than</span>
<a name="l00082"></a>00082 <span class="comment">// MAX_LM_EXPIRATION.</span>
<a name="l00083"></a>00083 <span class="preprocessor">#ifndef LM_EXPIRATION</span>
<a name="l00084"></a><a class="code" href="HTTPCacheTable_8cc.html#ac34ecfc4f379afa6b7cbcf41c7781d0d">00084</a> <span class="preprocessor"></span><span class="preprocessor">#define LM_EXPIRATION(t) (min((MAX_LM_EXPIRATION), static_cast<int>((t) / 10)))</span>
<a name="l00085"></a>00085 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00086"></a>00086 <span class="preprocessor"></span>
<a name="l00087"></a><a class="code" href="HTTPCacheTable_8cc.html#a17929d1ac6258253df584173f0c6e279">00087</a> <span class="keyword">const</span> <span class="keywordtype">int</span> <a class="code" href="HTTPCacheTable_8cc.html#a17929d1ac6258253df584173f0c6e279">CACHE_TABLE_SIZE</a> = 1499;
<a name="l00088"></a>00088
<a name="l00089"></a>00089 <span class="keyword">using namespace </span>std;
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="keyword">namespace </span>libdap {
<a name="l00092"></a>00092
<a name="l00096"></a>00096 <span class="keywordtype">int</span>
<a name="l00097"></a><a class="code" href="namespacelibdap.html#a68a16ef70e29c367dabd3cb5165c386a">00097</a> <a class="code" href="namespacelibdap.html#a68a16ef70e29c367dabd3cb5165c386a">get_hash</a>(<span class="keyword">const</span> <span class="keywordtype">string</span> &url)
<a name="l00098"></a>00098 {
<a name="l00099"></a>00099 <span class="keywordtype">int</span> hash = 0;
<a name="l00100"></a>00100
<a name="l00101"></a>00101 <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keywordtype">char</span> *ptr = url.c_str(); *ptr; ptr++)
<a name="l00102"></a>00102 hash = (<span class="keywordtype">int</span>)((hash * 3 + (*(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *)ptr)) % <a class="code" href="HTTPCacheTable_8cc.html#a17929d1ac6258253df584173f0c6e279">CACHE_TABLE_SIZE</a>);
<a name="l00103"></a>00103
<a name="l00104"></a>00104 <span class="keywordflow">return</span> hash;
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106
<a name="l00107"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a03e241526025dfaeb2662f7c15ce1d17">00107</a> HTTPCacheTable::HTTPCacheTable(<span class="keyword">const</span> <span class="keywordtype">string</span> &cache_root, <span class="keywordtype">int</span> block_size) :
<a name="l00108"></a>00108 d_cache_root(cache_root),
<a name="l00109"></a>00109 d_block_size(block_size),
<a name="l00110"></a>00110 d_current_size(0),
<a name="l00111"></a>00111 d_new_entries(0)
<a name="l00112"></a>00112 {
<a name="l00113"></a>00113 d_cache_index = cache_root + <a class="code" href="HTTPCacheTable_8cc.html#a2fcbe1f1875c3c4b38a63ea99b906c49">CACHE_INDEX</a>;
<a name="l00114"></a>00114
<a name="l00115"></a>00115 d_cache_table = <span class="keyword">new</span> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a36425575bbfac384964ce2f364f15679">CacheEntries</a>*[<a class="code" href="HTTPCacheTable_8cc.html#a17929d1ac6258253df584173f0c6e279">CACHE_TABLE_SIZE</a>];
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <span class="comment">// Initialize the cache table.</span>
<a name="l00118"></a>00118 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < <a class="code" href="HTTPCacheTable_8cc.html#a17929d1ac6258253df584173f0c6e279">CACHE_TABLE_SIZE</a>; ++i)
<a name="l00119"></a>00119 d_cache_table[i] = 0;
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a24e70dae002ffeef9641bb6493109513">cache_index_read</a>();
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00127"></a>00127 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span>
<a name="l00128"></a>00128 delete_cache_entry(<a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *e)
<a name="l00129"></a>00129 {
<a name="l00130"></a>00130 <a class="code" href="debug_8h.html#ac1f764c266c50f0050e33557004c914c">DBG2</a>(cerr << <span class="stringliteral">"Deleting CacheEntry: "</span> << e << endl);
<a name="l00131"></a>00131 <span class="keyword">delete</span> e;
<a name="l00132"></a>00132 }
<a name="l00133"></a>00133
<a name="l00134"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a78d0655261edb7f9ff0b2d61b7f97917">00134</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a78d0655261edb7f9ff0b2d61b7f97917">HTTPCacheTable::~HTTPCacheTable</a>() {
<a name="l00135"></a>00135 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < <a class="code" href="HTTPCacheTable_8cc.html#a17929d1ac6258253df584173f0c6e279">CACHE_TABLE_SIZE</a>; ++i) {
<a name="l00136"></a>00136 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a36425575bbfac384964ce2f364f15679">HTTPCacheTable::CacheEntries</a> *cp = get_cache_table()[i];
<a name="l00137"></a>00137 <span class="keywordflow">if</span> (cp) {
<a name="l00138"></a>00138 <span class="comment">// delete each entry</span>
<a name="l00139"></a>00139 for_each(cp->begin(), cp->end(), delete_cache_entry);
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="comment">// now delete the vector that held the entries</span>
<a name="l00142"></a>00142 <span class="keyword">delete</span> get_cache_table()[i];
<a name="l00143"></a>00143 get_cache_table()[i] = 0;
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146
<a name="l00147"></a>00147 <span class="keyword">delete</span>[] d_cache_table;
<a name="l00148"></a>00148 }
<a name="l00149"></a>00149
<a name="l00157"></a>00157 <span class="keyword">class </span>DeleteExpired : <span class="keyword">public</span> unary_function<HTTPCacheTable::CacheEntry *&, void> {
<a name="l00158"></a>00158 time_t d_time;
<a name="l00159"></a>00159 <a class="code" href="classlibdap_1_1HTTPCacheTable.html">HTTPCacheTable</a> &d_table;
<a name="l00160"></a>00160
<a name="l00161"></a>00161 <span class="keyword">public</span>:
<a name="l00162"></a>00162 DeleteExpired(<a class="code" href="classlibdap_1_1HTTPCacheTable.html">HTTPCacheTable</a> &table, time_t t) :
<a name="l00163"></a>00163 d_time(t), d_table(table) {
<a name="l00164"></a>00164 <span class="keywordflow">if</span> (!t)
<a name="l00165"></a>00165 d_time = time(0); <span class="comment">// 0 == now</span>
<a name="l00166"></a>00166 }
<a name="l00167"></a>00167
<a name="l00168"></a>00168 <span class="keywordtype">void</span> operator()(HTTPCacheTable::CacheEntry *&e) {
<a name="l00169"></a>00169 <span class="keywordflow">if</span> (e && !e->readers && (e->freshness_lifetime
<a name="l00170"></a>00170 < (e->corrected_initial_age + (d_time - e->response_time)))) {
<a name="l00171"></a>00171 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"Deleting expired cache entry: "</span> << e->url << endl);
<a name="l00172"></a>00172 d_table.remove_cache_entry(e);
<a name="l00173"></a>00173 <span class="keyword">delete</span> e; e = 0;
<a name="l00174"></a>00174 }
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176 };
<a name="l00177"></a>00177
<a name="l00178"></a>00178 <span class="comment">// @param time base deletes againt this time, defaults to 0 (now)</span>
<a name="l00179"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a107d8cc87728a855eaa18210b90c09d5">00179</a> <span class="keywordtype">void</span> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a107d8cc87728a855eaa18210b90c09d5">HTTPCacheTable::delete_expired_entries</a>(time_t time) {
<a name="l00180"></a>00180 <span class="comment">// Walk through and delete all the expired entries.</span>
<a name="l00181"></a>00181 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> cnt = 0; cnt < <a class="code" href="HTTPCacheTable_8cc.html#a17929d1ac6258253df584173f0c6e279">CACHE_TABLE_SIZE</a>; cnt++) {
<a name="l00182"></a>00182 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a36425575bbfac384964ce2f364f15679">HTTPCacheTable::CacheEntries</a> *slot = get_cache_table()[cnt];
<a name="l00183"></a>00183 <span class="keywordflow">if</span> (slot) {
<a name="l00184"></a>00184 for_each(slot->begin(), slot->end(), DeleteExpired(*<span class="keyword">this</span>, time));
<a name="l00185"></a>00185 slot->erase(<span class="keyword">remove</span>(slot->begin(), slot->end(),
<a name="l00186"></a>00186 <span class="keyword">static_cast<</span><a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *<span class="keyword">></span>(0)), slot->end());
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188 }
<a name="l00189"></a>00189 }
<a name="l00190"></a>00190
<a name="l00197"></a>00197 <span class="keyword">class </span>DeleteByHits : <span class="keyword">public</span> unary_function<HTTPCacheTable::CacheEntry *&, void> {
<a name="l00198"></a>00198 <a class="code" href="classlibdap_1_1HTTPCacheTable.html">HTTPCacheTable</a> &d_table;
<a name="l00199"></a>00199 <span class="keywordtype">int</span> d_hits;
<a name="l00200"></a>00200
<a name="l00201"></a>00201 <span class="keyword">public</span>:
<a name="l00202"></a>00202 DeleteByHits(<a class="code" href="classlibdap_1_1HTTPCacheTable.html">HTTPCacheTable</a> &table, <span class="keywordtype">int</span> hits) :
<a name="l00203"></a>00203 d_table(table), d_hits(hits) {
<a name="l00204"></a>00204 }
<a name="l00205"></a>00205
<a name="l00206"></a>00206 <span class="keywordtype">void</span> operator()(HTTPCacheTable::CacheEntry *&e) {
<a name="l00207"></a>00207 <span class="keywordflow">if</span> (e && !e->readers && e->hits <= d_hits) {
<a name="l00208"></a>00208 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"Deleting cache entry: "</span> << e->url << endl);
<a name="l00209"></a>00209 d_table.remove_cache_entry(e);
<a name="l00210"></a>00210 <span class="keyword">delete</span> e; e = 0;
<a name="l00211"></a>00211 }
<a name="l00212"></a>00212 }
<a name="l00213"></a>00213 };
<a name="l00214"></a>00214
<a name="l00215"></a>00215 <span class="keywordtype">void</span>
<a name="l00216"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a51707b1b5533c2d06e57dc52a0ea90b2">00216</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a51707b1b5533c2d06e57dc52a0ea90b2">HTTPCacheTable::delete_by_hits</a>(<span class="keywordtype">int</span> hits) {
<a name="l00217"></a>00217 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> cnt = 0; cnt < <a class="code" href="HTTPCacheTable_8cc.html#a17929d1ac6258253df584173f0c6e279">CACHE_TABLE_SIZE</a>; cnt++) {
<a name="l00218"></a>00218 <span class="keywordflow">if</span> (get_cache_table()[cnt]) {
<a name="l00219"></a>00219 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a36425575bbfac384964ce2f364f15679">HTTPCacheTable::CacheEntries</a> *slot = get_cache_table()[cnt];
<a name="l00220"></a>00220 for_each(slot->begin(), slot->end(), DeleteByHits(*<span class="keyword">this</span>, hits));
<a name="l00221"></a>00221 slot->erase(<span class="keyword">remove</span>(slot->begin(), slot->end(),
<a name="l00222"></a>00222 <span class="keyword">static_cast<</span><a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a>*<span class="keyword">></span>(0)),
<a name="l00223"></a>00223 slot->end());
<a name="l00224"></a>00224
<a name="l00225"></a>00225 }
<a name="l00226"></a>00226 }
<a name="l00227"></a>00227 }
<a name="l00228"></a>00228
<a name="l00233"></a>00233 <span class="keyword">class </span>DeleteBySize : <span class="keyword">public</span> unary_function<HTTPCacheTable::CacheEntry *&, void> {
<a name="l00234"></a>00234 <a class="code" href="classlibdap_1_1HTTPCacheTable.html">HTTPCacheTable</a> &d_table;
<a name="l00235"></a>00235 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> d_size;
<a name="l00236"></a>00236
<a name="l00237"></a>00237 <span class="keyword">public</span>:
<a name="l00238"></a>00238 DeleteBySize(<a class="code" href="classlibdap_1_1HTTPCacheTable.html">HTTPCacheTable</a> &table, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size) :
<a name="l00239"></a>00239 d_table(table), d_size(size) {
<a name="l00240"></a>00240 }
<a name="l00241"></a>00241
<a name="l00242"></a>00242 <span class="keywordtype">void</span> operator()(HTTPCacheTable::CacheEntry *&e) {
<a name="l00243"></a>00243 <span class="keywordflow">if</span> (e && !e->readers && e->size > d_size) {
<a name="l00244"></a>00244 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"Deleting cache entry: "</span> << e->url << endl);
<a name="l00245"></a>00245 d_table.remove_cache_entry(e);
<a name="l00246"></a>00246 <span class="keyword">delete</span> e; e = 0;
<a name="l00247"></a>00247 }
<a name="l00248"></a>00248 }
<a name="l00249"></a>00249 };
<a name="l00250"></a>00250
<a name="l00251"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a04655ab9af621a261420ed8af681cf80">00251</a> <span class="keywordtype">void</span> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a04655ab9af621a261420ed8af681cf80">HTTPCacheTable::delete_by_size</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size) {
<a name="l00252"></a>00252 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> cnt = 0; cnt < <a class="code" href="HTTPCacheTable_8cc.html#a17929d1ac6258253df584173f0c6e279">CACHE_TABLE_SIZE</a>; cnt++) {
<a name="l00253"></a>00253 <span class="keywordflow">if</span> (get_cache_table()[cnt]) {
<a name="l00254"></a>00254 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a36425575bbfac384964ce2f364f15679">HTTPCacheTable::CacheEntries</a> *slot = get_cache_table()[cnt];
<a name="l00255"></a>00255 for_each(slot->begin(), slot->end(), DeleteBySize(*<span class="keyword">this</span>, size));
<a name="l00256"></a>00256 slot->erase(<span class="keyword">remove</span>(slot->begin(), slot->end(),
<a name="l00257"></a>00257 <span class="keyword">static_cast<</span><a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a>*<span class="keyword">></span>(0)),
<a name="l00258"></a>00258 slot->end());
<a name="l00259"></a>00259
<a name="l00260"></a>00260 }
<a name="l00261"></a>00261 }
<a name="l00262"></a>00262 }
<a name="l00263"></a>00263
<a name="l00270"></a>00270
<a name="l00277"></a>00277 <span class="keywordtype">bool</span>
<a name="l00278"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a3e636690b069b3384e908135fcaebd51">00278</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a3e636690b069b3384e908135fcaebd51">HTTPCacheTable::cache_index_delete</a>()
<a name="l00279"></a>00279 {
<a name="l00280"></a>00280 d_new_entries = 0;
<a name="l00281"></a>00281
<a name="l00282"></a>00282 <span class="keywordflow">return</span> (<a class="code" href="HTTPCacheTable_8cc.html#a2a6edcee170a79b132872d22066754ed">REMOVE</a>(d_cache_index.c_str()) == 0);
<a name="l00283"></a>00283 }
<a name="l00284"></a>00284
<a name="l00293"></a>00293 <span class="keywordtype">bool</span>
<a name="l00294"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a24e70dae002ffeef9641bb6493109513">00294</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a24e70dae002ffeef9641bb6493109513">HTTPCacheTable::cache_index_read</a>()
<a name="l00295"></a>00295 {
<a name="l00296"></a>00296 FILE *fp = fopen(d_cache_index.c_str(), <span class="stringliteral">"r"</span>);
<a name="l00297"></a>00297 <span class="comment">// If the cache index can't be opened that's OK; start with an empty</span>
<a name="l00298"></a>00298 <span class="comment">// cache. 09/05/02 jhrg</span>
<a name="l00299"></a>00299 <span class="keywordflow">if</span> (!fp) {
<a name="l00300"></a>00300 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00301"></a>00301 }
<a name="l00302"></a>00302
<a name="l00303"></a>00303 <span class="keywordtype">char</span> line[1024];
<a name="l00304"></a>00304 <span class="keywordflow">while</span> (!feof(fp) && fgets(line, 1024, fp)) {
<a name="l00305"></a>00305 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a8f5660848048a98454fce23c28de573c">add_entry_to_cache_table</a>(<a class="code" href="classlibdap_1_1HTTPCacheTable.html#a48569affedb01e6e0e87343bcc621c0a">cache_index_parse_line</a>(line));
<a name="l00306"></a>00306 <a class="code" href="debug_8h.html#ac1f764c266c50f0050e33557004c914c">DBG2</a>(cerr << line << endl);
<a name="l00307"></a>00307 }
<a name="l00308"></a>00308
<a name="l00309"></a>00309 <span class="keywordtype">int</span> res = fclose(fp) ;
<a name="l00310"></a>00310 <span class="keywordflow">if</span> (res) {
<a name="l00311"></a>00311 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"HTTPCache::cache_index_read - Failed to close "</span> << (<span class="keywordtype">void</span> *)fp << endl);
<a name="l00312"></a>00312 }
<a name="l00313"></a>00313
<a name="l00314"></a>00314 d_new_entries = 0;
<a name="l00315"></a>00315
<a name="l00316"></a>00316 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00317"></a>00317 }
<a name="l00318"></a>00318
<a name="l00326"></a>00326 <a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *
<a name="l00327"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a48569affedb01e6e0e87343bcc621c0a">00327</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a48569affedb01e6e0e87343bcc621c0a">HTTPCacheTable::cache_index_parse_line</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *line)
<a name="l00328"></a>00328 {
<a name="l00329"></a>00329 <span class="comment">// Read the line and create the cache object</span>
<a name="l00330"></a>00330 <a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *entry = <span class="keyword">new</span> <a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a>;
<a name="l00331"></a>00331 istringstream iss(line);
<a name="l00332"></a>00332 iss >> entry->url;
<a name="l00333"></a>00333 iss >> entry->cachename;
<a name="l00334"></a>00334
<a name="l00335"></a>00335 iss >> entry->etag;
<a name="l00336"></a>00336 <span class="keywordflow">if</span> (entry->etag == <a class="code" href="HTTPCacheTable_8cc.html#a69b733628460a6923e506281cd95c43f">CACHE_EMPTY_ETAG</a>)
<a name="l00337"></a>00337 entry->etag = <span class="stringliteral">""</span>;
<a name="l00338"></a>00338
<a name="l00339"></a>00339 iss >> entry->lm;
<a name="l00340"></a>00340 iss >> entry->expires;
<a name="l00341"></a>00341 iss >> entry->size;
<a name="l00342"></a>00342 iss >> entry->range; <span class="comment">// range is not used. 10/02/02 jhrg</span>
<a name="l00343"></a>00343
<a name="l00344"></a>00344 iss >> entry->hash;
<a name="l00345"></a>00345 iss >> entry->hits;
<a name="l00346"></a>00346 iss >> entry->freshness_lifetime;
<a name="l00347"></a>00347 iss >> entry->response_time;
<a name="l00348"></a>00348 iss >> entry->corrected_initial_age;
<a name="l00349"></a>00349
<a name="l00350"></a>00350 iss >> entry->must_revalidate;
<a name="l00351"></a>00351
<a name="l00352"></a>00352 <span class="keywordflow">return</span> entry;
<a name="l00353"></a>00353 }
<a name="l00354"></a>00354
<a name="l00357"></a>00357 <span class="keyword">class </span>WriteOneCacheEntry :
<a name="l00358"></a>00358 <span class="keyword">public</span> unary_function<HTTPCacheTable::CacheEntry *, void>
<a name="l00359"></a>00359 {
<a name="l00360"></a>00360
<a name="l00361"></a>00361 FILE *d_fp;
<a name="l00362"></a>00362
<a name="l00363"></a>00363 <span class="keyword">public</span>:
<a name="l00364"></a>00364 WriteOneCacheEntry(FILE *fp) : d_fp(fp)
<a name="l00365"></a>00365 {}
<a name="l00366"></a>00366
<a name="l00367"></a>00367 <span class="keywordtype">void</span> operator()(HTTPCacheTable::CacheEntry *e)
<a name="l00368"></a>00368 {
<a name="l00369"></a>00369 <span class="keywordflow">if</span> (e && fprintf(d_fp,
<a name="l00370"></a>00370 <span class="stringliteral">"%s %s %s %ld %ld %ld %c %d %d %ld %ld %ld %c\r\n"</span>,
<a name="l00371"></a>00371 e->url.c_str(),
<a name="l00372"></a>00372 e->cachename.c_str(),
<a name="l00373"></a>00373 e->etag == <span class="stringliteral">""</span> ? <a class="code" href="HTTPCacheTable_8cc.html#a69b733628460a6923e506281cd95c43f">CACHE_EMPTY_ETAG</a> : e->etag.c_str(),
<a name="l00374"></a>00374 (long)(e->lm),
<a name="l00375"></a>00375 (long)(e->expires),
<a name="l00376"></a>00376 e->size,
<a name="l00377"></a>00377 e->range ? <span class="charliteral">'1'</span> : <span class="charliteral">'0'</span>, <span class="comment">// not used. 10/02/02 jhrg</span>
<a name="l00378"></a>00378 e->hash,
<a name="l00379"></a>00379 e->hits,
<a name="l00380"></a>00380 (long)(e->freshness_lifetime),
<a name="l00381"></a>00381 (long)(e->response_time),
<a name="l00382"></a>00382 (long)(e->corrected_initial_age),
<a name="l00383"></a>00383 e->must_revalidate ? <span class="charliteral">'1'</span> : <span class="charliteral">'0'</span>) < 0)
<a name="l00384"></a>00384 <span class="keywordflow">throw</span> Error(<span class="stringliteral">"Cache Index. Error writing cache index\n"</span>);
<a name="l00385"></a>00385 }
<a name="l00386"></a>00386 };
<a name="l00387"></a>00387
<a name="l00397"></a>00397 <span class="keywordtype">void</span>
<a name="l00398"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a7cd5a3a24fd0cd41ac0d9a3192075e9c">00398</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a7cd5a3a24fd0cd41ac0d9a3192075e9c">HTTPCacheTable::cache_index_write</a>()
<a name="l00399"></a>00399 {
<a name="l00400"></a>00400 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"Cache Index. Writing index "</span> << d_cache_index << endl);
<a name="l00401"></a>00401
<a name="l00402"></a>00402 <span class="comment">// Open the file for writing.</span>
<a name="l00403"></a>00403 FILE * fp = NULL;
<a name="l00404"></a>00404 <span class="keywordflow">if</span> ((fp = fopen(d_cache_index.c_str(), <span class="stringliteral">"wb"</span>)) == NULL) {
<a name="l00405"></a>00405 <span class="keywordflow">throw</span> <a class="code" href="classlibdap_1_1Error.html" title="A class for error processing.">Error</a>(<span class="keywordtype">string</span>(<span class="stringliteral">"Cache Index. Can't open `"</span>) + d_cache_index
<a name="l00406"></a>00406 + <span class="keywordtype">string</span>(<span class="stringliteral">"' for writing"</span>));
<a name="l00407"></a>00407 }
<a name="l00408"></a>00408
<a name="l00409"></a>00409 <span class="comment">// Walk through the list and write it out. The format is really</span>
<a name="l00410"></a>00410 <span class="comment">// simple as we keep it all in ASCII.</span>
<a name="l00411"></a>00411
<a name="l00412"></a>00412 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> cnt = 0; cnt < <a class="code" href="HTTPCacheTable_8cc.html#a17929d1ac6258253df584173f0c6e279">CACHE_TABLE_SIZE</a>; cnt++) {
<a name="l00413"></a>00413 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a36425575bbfac384964ce2f364f15679">HTTPCacheTable::CacheEntries</a> *cp = get_cache_table()[cnt];
<a name="l00414"></a>00414 <span class="keywordflow">if</span> (cp)
<a name="l00415"></a>00415 for_each(cp->begin(), cp->end(), WriteOneCacheEntry(fp));
<a name="l00416"></a>00416 }
<a name="l00417"></a>00417
<a name="l00418"></a>00418 <span class="comment">/* Done writing */</span>
<a name="l00419"></a>00419 <span class="keywordtype">int</span> res = fclose(fp);
<a name="l00420"></a>00420 <span class="keywordflow">if</span> (res) {
<a name="l00421"></a>00421 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"HTTPCache::cache_index_write - Failed to close "</span>
<a name="l00422"></a>00422 << (<span class="keywordtype">void</span> *)fp << endl);
<a name="l00423"></a>00423 }
<a name="l00424"></a>00424
<a name="l00425"></a>00425 d_new_entries = 0;
<a name="l00426"></a>00426 }
<a name="l00427"></a>00427
<a name="l00429"></a>00429
<a name="l00442"></a>00442 <span class="keywordtype">string</span>
<a name="l00443"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a0f7f6193848fb3ba8ad17082fd95b6c6">00443</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a0f7f6193848fb3ba8ad17082fd95b6c6">HTTPCacheTable::create_hash_directory</a>(<span class="keywordtype">int</span> hash)
<a name="l00444"></a>00444 {
<a name="l00445"></a>00445 <span class="keyword">struct </span>stat stat_info;
<a name="l00446"></a>00446 ostringstream path;
<a name="l00447"></a>00447
<a name="l00448"></a>00448 path << d_cache_root << hash;
<a name="l00449"></a>00449 <span class="keywordtype">string</span> p = path.str();
<a name="l00450"></a>00450
<a name="l00451"></a>00451 <span class="keywordflow">if</span> (stat(p.c_str(), &stat_info) == -1) {
<a name="l00452"></a>00452 <a class="code" href="debug_8h.html#ac1f764c266c50f0050e33557004c914c">DBG2</a>(cerr << <span class="stringliteral">"Cache....... Create dir "</span> << p << endl);
<a name="l00453"></a>00453 <span class="keywordflow">if</span> (<a class="code" href="HTTPCacheTable_8cc.html#a2bf44344e285663ad0b0b7bb001ac4fd">MKDIR</a>(p.c_str(), 0777) < 0) {
<a name="l00454"></a>00454 <a class="code" href="debug_8h.html#ac1f764c266c50f0050e33557004c914c">DBG2</a>(cerr << <span class="stringliteral">"Cache....... Can't create..."</span> << endl);
<a name="l00455"></a>00455 <span class="keywordflow">throw</span> <a class="code" href="classlibdap_1_1Error.html" title="A class for error processing.">Error</a>(<span class="stringliteral">"Could not create cache slot to hold response! Check the write permissions on your disk cache directory. Cache root: "</span> + d_cache_root + <span class="stringliteral">"."</span>);
<a name="l00456"></a>00456 }
<a name="l00457"></a>00457 }
<a name="l00458"></a>00458 <span class="keywordflow">else</span> {
<a name="l00459"></a>00459 <a class="code" href="debug_8h.html#ac1f764c266c50f0050e33557004c914c">DBG2</a>(cerr << <span class="stringliteral">"Cache....... Directory "</span> << p << <span class="stringliteral">" already exists"</span>
<a name="l00460"></a>00460 << endl);
<a name="l00461"></a>00461 }
<a name="l00462"></a>00462
<a name="l00463"></a>00463 <span class="keywordflow">return</span> p;
<a name="l00464"></a>00464 }
<a name="l00465"></a>00465
<a name="l00480"></a>00480 <span class="keywordtype">void</span>
<a name="l00481"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a0ab52cb3d5d01575977adb33a21b31d2">00481</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a0ab52cb3d5d01575977adb33a21b31d2">HTTPCacheTable::create_location</a>(<a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *entry)
<a name="l00482"></a>00482 {
<a name="l00483"></a>00483 <span class="keywordtype">string</span> hash_dir = <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a0f7f6193848fb3ba8ad17082fd95b6c6">create_hash_directory</a>(entry->hash);
<a name="l00484"></a>00484 <span class="preprocessor">#ifdef WIN32</span>
<a name="l00485"></a>00485 <span class="preprocessor"></span> hash_dir += <span class="stringliteral">"\\dodsXXXXXX"</span>;
<a name="l00486"></a>00486 <span class="preprocessor">#else</span>
<a name="l00487"></a>00487 <span class="preprocessor"></span> hash_dir += <span class="stringliteral">"/dodsXXXXXX"</span>; <span class="comment">// mkstemp uses six characters.</span>
<a name="l00488"></a>00488 <span class="preprocessor">#endif</span>
<a name="l00489"></a>00489 <span class="preprocessor"></span>
<a name="l00490"></a>00490 <span class="comment">// mkstemp uses the storage passed to it; must be writable and local.</span>
<a name="l00491"></a>00491 <span class="keywordtype">char</span> *templat = <span class="keyword">new</span> <span class="keywordtype">char</span>[hash_dir.size() + 1];
<a name="l00492"></a>00492 strcpy(templat, hash_dir.c_str());
<a name="l00493"></a>00493
<a name="l00494"></a>00494 <span class="comment">// Open truncated for update. NB: mkstemp() returns a file descriptor.</span>
<a name="l00495"></a>00495 <span class="comment">// man mkstemp says "... The file is opened with the O_EXCL flag,</span>
<a name="l00496"></a>00496 <span class="comment">// guaranteeing that when mkstemp returns successfully we are the only</span>
<a name="l00497"></a>00497 <span class="comment">// user." 09/19/02 jhrg</span>
<a name="l00498"></a>00498 <span class="keywordtype">int</span> fd = <a class="code" href="HTTPCacheTable_8cc.html#ae76603c1b2ef94cb2664dbad1b82a4c6">MKSTEMP</a>(templat); <span class="comment">// fd mode is 666 or 600 (Unix)</span>
<a name="l00499"></a>00499 <span class="keywordflow">if</span> (fd < 0) {
<a name="l00500"></a>00500 <span class="keyword">delete</span>[] templat; templat = 0;
<a name="l00501"></a>00501 close(fd);
<a name="l00502"></a>00502 <span class="keywordflow">throw</span> <a class="code" href="classlibdap_1_1Error.html" title="A class for error processing.">Error</a>(<span class="stringliteral">"The HTTP Cache could not create a file to hold the response; it will not be cached."</span>);
<a name="l00503"></a>00503 }
<a name="l00504"></a>00504
<a name="l00505"></a>00505 entry->cachename = templat;
<a name="l00506"></a>00506 <span class="keyword">delete</span>[] templat; templat = 0;
<a name="l00507"></a>00507 close(fd);
<a name="l00508"></a>00508 }
<a name="l00509"></a>00509
<a name="l00510"></a>00510
<a name="l00512"></a>00512 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span>
<a name="l00513"></a>00513 entry_disk_space(<span class="keywordtype">int</span> size, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> block_size)
<a name="l00514"></a>00514 {
<a name="l00515"></a>00515 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> num_of_blocks = (size + block_size) / block_size;
<a name="l00516"></a>00516
<a name="l00517"></a>00517 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"size: "</span> << size << <span class="stringliteral">", block_size: "</span> << block_size
<a name="l00518"></a>00518 << <span class="stringliteral">", num_of_blocks: "</span> << num_of_blocks << endl);
<a name="l00519"></a>00519
<a name="l00520"></a>00520 <span class="keywordflow">return</span> num_of_blocks * block_size;
<a name="l00521"></a>00521 }
<a name="l00522"></a>00522
<a name="l00526"></a>00526
<a name="l00532"></a>00532 <span class="keywordtype">void</span>
<a name="l00533"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a8f5660848048a98454fce23c28de573c">00533</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a8f5660848048a98454fce23c28de573c">HTTPCacheTable::add_entry_to_cache_table</a>(<a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">CacheEntry</a> *entry)
<a name="l00534"></a>00534 {
<a name="l00535"></a>00535 <span class="keywordtype">int</span> hash = entry->hash;
<a name="l00536"></a>00536
<a name="l00537"></a>00537 <span class="keywordflow">if</span> (!d_cache_table[hash])
<a name="l00538"></a>00538 d_cache_table[hash] = <span class="keyword">new</span> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a36425575bbfac384964ce2f364f15679">CacheEntries</a>;
<a name="l00539"></a>00539
<a name="l00540"></a>00540 d_cache_table[hash]->push_back(entry);
<a name="l00541"></a>00541
<a name="l00542"></a>00542 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"add_entry_to_cache_table, current_size: "</span> << d_current_size
<a name="l00543"></a>00543 << <span class="stringliteral">", entry->size: "</span> << entry->size << <span class="stringliteral">", block size: "</span> << d_block_size
<a name="l00544"></a>00544 << endl);
<a name="l00545"></a>00545
<a name="l00546"></a>00546 d_current_size += entry_disk_space(entry->size, d_block_size);
<a name="l00547"></a>00547
<a name="l00548"></a>00548 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"add_entry_to_cache_table, current_size: "</span> << d_current_size << endl);
<a name="l00549"></a>00549
<a name="l00550"></a>00550 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#af17bd7a96186412f3ef53caed42db767">increment_new_entries</a>();
<a name="l00551"></a>00551 }
<a name="l00552"></a>00552
<a name="l00556"></a>00556 <a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *
<a name="l00557"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#ac8c8e58c208b8c542b89f500829032a0">00557</a> HTTPCacheTable::get_locked_entry_from_cache_table(<span class="keyword">const</span> <span class="keywordtype">string</span> &url) <span class="comment">/*const*/</span>
<a name="l00558"></a>00558 {
<a name="l00559"></a>00559 <span class="keywordflow">return</span> get_locked_entry_from_cache_table(<a class="code" href="namespacelibdap.html#a68a16ef70e29c367dabd3cb5165c386a">get_hash</a>(url), url);
<a name="l00560"></a>00560 }
<a name="l00561"></a>00561
<a name="l00569"></a>00569 <a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *
<a name="l00570"></a>00570 HTTPCacheTable::get_locked_entry_from_cache_table(<span class="keywordtype">int</span> hash, <span class="keyword">const</span> <span class="keywordtype">string</span> &url) <span class="comment">/*const*/</span>
<a name="l00571"></a>00571 {
<a name="l00572"></a>00572 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"url: "</span> << url << <span class="stringliteral">"; hash: "</span> << hash << endl);
<a name="l00573"></a>00573 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"d_cache_table: "</span> << hex << d_cache_table << dec << endl);
<a name="l00574"></a>00574 <span class="keywordflow">if</span> (d_cache_table[hash]) {
<a name="l00575"></a>00575 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a36425575bbfac384964ce2f364f15679">CacheEntries</a> *cp = d_cache_table[hash];
<a name="l00576"></a>00576 <span class="keywordflow">for</span> (<a class="code" href="classlibdap_1_1HTTPCacheTable.html#a8527d6a5b1e720e2d500e1ec1eeecf9f">CacheEntriesIter</a> i = cp->begin(); i != cp->end(); ++i) {
<a name="l00577"></a>00577 <span class="comment">// Must test *i because perform_garbage_collection may have</span>
<a name="l00578"></a>00578 <span class="comment">// removed this entry; the CacheEntry will then be null.</span>
<a name="l00579"></a>00579 <span class="keywordflow">if</span> ((*i) && (*i)->url == url) {
<a name="l00580"></a>00580 (*i)->lock_read_response(); <span class="comment">// Lock the response</span>
<a name="l00581"></a>00581 <span class="keywordflow">return</span> *i;
<a name="l00582"></a>00582 }
<a name="l00583"></a>00583 }
<a name="l00584"></a>00584 }
<a name="l00585"></a>00585
<a name="l00586"></a>00586 <span class="keywordflow">return</span> 0;
<a name="l00587"></a>00587 }
<a name="l00588"></a>00588
<a name="l00595"></a>00595 HTTPCacheTable::CacheEntry *
<a name="l00596"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a57c01c8b9462f0e0ea6541b7d9fcf2f5">00596</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a57c01c8b9462f0e0ea6541b7d9fcf2f5">HTTPCacheTable::get_write_locked_entry_from_cache_table</a>(<span class="keyword">const</span> <span class="keywordtype">string</span> &url)
<a name="l00597"></a>00597 {
<a name="l00598"></a>00598 <span class="keywordtype">int</span> hash = <a class="code" href="namespacelibdap.html#a68a16ef70e29c367dabd3cb5165c386a">get_hash</a>(url);
<a name="l00599"></a>00599 <span class="keywordflow">if</span> (d_cache_table[hash]) {
<a name="l00600"></a>00600 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a36425575bbfac384964ce2f364f15679">CacheEntries</a> *cp = d_cache_table[hash];
<a name="l00601"></a>00601 <span class="keywordflow">for</span> (<a class="code" href="classlibdap_1_1HTTPCacheTable.html#a8527d6a5b1e720e2d500e1ec1eeecf9f">CacheEntriesIter</a> i = cp->begin(); i != cp->end(); ++i) {
<a name="l00602"></a>00602 <span class="comment">// Must test *i because perform_garbage_collection may have</span>
<a name="l00603"></a>00603 <span class="comment">// removed this entry; the CacheEntry will then be null.</span>
<a name="l00604"></a>00604 <span class="keywordflow">if</span> ((*i) && (*i)->url == url) {
<a name="l00605"></a>00605 (*i)->lock_write_response(); <span class="comment">// Lock the response</span>
<a name="l00606"></a>00606 <span class="keywordflow">return</span> *i;
<a name="l00607"></a>00607 }
<a name="l00608"></a>00608 }
<a name="l00609"></a>00609 }
<a name="l00610"></a>00610
<a name="l00611"></a>00611 <span class="keywordflow">return</span> 0;
<a name="l00612"></a>00612 }
<a name="l00613"></a>00613
<a name="l00621"></a>00621 <span class="keywordtype">void</span>
<a name="l00622"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a85d4438820f0920002f5e77b51900ea9">00622</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a85d4438820f0920002f5e77b51900ea9">HTTPCacheTable::remove_cache_entry</a>(<a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *entry)
<a name="l00623"></a>00623 {
<a name="l00624"></a>00624 <span class="comment">// This should never happen; all calls to this method are protected by</span>
<a name="l00625"></a>00625 <span class="comment">// the caller, hence the InternalErr.</span>
<a name="l00626"></a>00626 <span class="keywordflow">if</span> (entry->readers)
<a name="l00627"></a>00627 <span class="keywordflow">throw</span> <a class="code" href="classlibdap_1_1InternalErr.html" title="A class for software fault reporting.">InternalErr</a>(__FILE__, __LINE__, <span class="stringliteral">"Tried to delete a cache entry that is in use."</span>);
<a name="l00628"></a>00628
<a name="l00629"></a>00629 <a class="code" href="HTTPCacheTable_8cc.html#a2a6edcee170a79b132872d22066754ed">REMOVE</a>(entry->cachename.c_str());
<a name="l00630"></a>00630 <a class="code" href="HTTPCacheTable_8cc.html#a2a6edcee170a79b132872d22066754ed">REMOVE</a>(<span class="keywordtype">string</span>(entry->cachename + <a class="code" href="HTTPCacheTable_8cc.html#a9f34e7ee25eb923739b1ea126dce4528">CACHE_META</a>).c_str());
<a name="l00631"></a>00631
<a name="l00632"></a>00632 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"remove_cache_entry, current_size: "</span> << <a class="code" href="classlibdap_1_1HTTPCacheTable.html#abb0b2349fafffdd13eea562140083485">get_current_size</a>() << endl);
<a name="l00633"></a>00633
<a name="l00634"></a>00634 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> eds = entry_disk_space(entry->size, <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a0c0cd3182608b1ce1f3b930cf16e6779">get_block_size</a>());
<a name="l00635"></a>00635 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#abf4e75cf192355d7c7bfcf9f0e736168">set_current_size</a>((eds > <a class="code" href="classlibdap_1_1HTTPCacheTable.html#abb0b2349fafffdd13eea562140083485">get_current_size</a>()) ? 0 : <a class="code" href="classlibdap_1_1HTTPCacheTable.html#abb0b2349fafffdd13eea562140083485">get_current_size</a>() - eds);
<a name="l00636"></a>00636
<a name="l00637"></a>00637 <a class="code" href="debug_8h.html#a32adf79142f0a426b5e782fb7cd4cad3">DBG</a>(cerr << <span class="stringliteral">"remove_cache_entry, current_size: "</span> << <a class="code" href="classlibdap_1_1HTTPCacheTable.html#abb0b2349fafffdd13eea562140083485">get_current_size</a>() << endl);
<a name="l00638"></a>00638 }
<a name="l00639"></a>00639
<a name="l00642"></a>00642 <span class="keyword">class </span>DeleteCacheEntry: <span class="keyword">public</span> unary_function<HTTPCacheTable::CacheEntry *&, void>
<a name="l00643"></a>00643 {
<a name="l00644"></a>00644 <span class="keywordtype">string</span> d_url;
<a name="l00645"></a>00645 <a class="code" href="classlibdap_1_1HTTPCacheTable.html">HTTPCacheTable</a> *d_cache_table;
<a name="l00646"></a>00646
<a name="l00647"></a>00647 <span class="keyword">public</span>:
<a name="l00648"></a>00648 DeleteCacheEntry(<a class="code" href="classlibdap_1_1HTTPCacheTable.html">HTTPCacheTable</a> *c, <span class="keyword">const</span> <span class="keywordtype">string</span> &url)
<a name="l00649"></a>00649 : d_url(url), d_cache_table(c)
<a name="l00650"></a>00650 {}
<a name="l00651"></a>00651
<a name="l00652"></a>00652 <span class="keywordtype">void</span> operator()(HTTPCacheTable::CacheEntry *&e)
<a name="l00653"></a>00653 {
<a name="l00654"></a>00654 <span class="keywordflow">if</span> (e && e->url == d_url) {
<a name="l00655"></a>00655 e->lock_write_response();
<a name="l00656"></a>00656 d_cache_table->remove_cache_entry(e);
<a name="l00657"></a>00657 e->unlock_write_response();
<a name="l00658"></a>00658 <span class="keyword">delete</span> e; e = 0;
<a name="l00659"></a>00659 }
<a name="l00660"></a>00660 }
<a name="l00661"></a>00661 };
<a name="l00662"></a>00662
<a name="l00669"></a>00669 <span class="keywordtype">void</span>
<a name="l00670"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#ad1b8ffd257ff335b3d87b90600f5bffd">00670</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#ad1b8ffd257ff335b3d87b90600f5bffd">HTTPCacheTable::remove_entry_from_cache_table</a>(<span class="keyword">const</span> <span class="keywordtype">string</span> &url)
<a name="l00671"></a>00671 {
<a name="l00672"></a>00672 <span class="keywordtype">int</span> hash = <a class="code" href="namespacelibdap.html#a68a16ef70e29c367dabd3cb5165c386a">get_hash</a>(url);
<a name="l00673"></a>00673 <span class="keywordflow">if</span> (d_cache_table[hash]) {
<a name="l00674"></a>00674 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a36425575bbfac384964ce2f364f15679">CacheEntries</a> *cp = d_cache_table[hash];
<a name="l00675"></a>00675 for_each(cp->begin(), cp->end(), DeleteCacheEntry(<span class="keyword">this</span>, url));
<a name="l00676"></a>00676 cp->erase(<span class="keyword">remove</span>(cp->begin(), cp->end(), <span class="keyword">static_cast<</span><a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a>*<span class="keyword">></span>(0)),
<a name="l00677"></a>00677 cp->end());
<a name="l00678"></a>00678 }
<a name="l00679"></a>00679 }
<a name="l00680"></a>00680
<a name="l00683"></a>00683 <span class="keyword">class </span>DeleteUnlockedCacheEntry :
<a name="l00684"></a>00684 <span class="keyword">public</span> unary_function<HTTPCacheTable::CacheEntry *&, void> {
<a name="l00685"></a>00685 <a class="code" href="classlibdap_1_1HTTPCacheTable.html">HTTPCacheTable</a> &d_table;
<a name="l00686"></a>00686
<a name="l00687"></a>00687 <span class="keyword">public</span>:
<a name="l00688"></a>00688 DeleteUnlockedCacheEntry(<a class="code" href="classlibdap_1_1HTTPCacheTable.html">HTTPCacheTable</a> &t) :
<a name="l00689"></a>00689 d_table(t) {
<a name="l00690"></a>00690 }
<a name="l00691"></a>00691 <span class="keywordtype">void</span> operator()(HTTPCacheTable::CacheEntry *&e) {
<a name="l00692"></a>00692 <span class="keywordflow">if</span> (e) {
<a name="l00693"></a>00693 d_table.remove_cache_entry(e);
<a name="l00694"></a>00694 <span class="keyword">delete</span> e; e = 0;
<a name="l00695"></a>00695 }
<a name="l00696"></a>00696 }
<a name="l00697"></a>00697 };
<a name="l00698"></a>00698
<a name="l00699"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#ad02f9346125f4c311d6e74b6a8354f9e">00699</a> <span class="keywordtype">void</span> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#ad02f9346125f4c311d6e74b6a8354f9e">HTTPCacheTable::delete_all_entries</a>() {
<a name="l00700"></a>00700 <span class="comment">// Walk through the cache table and, for every entry in the cache, delete</span>
<a name="l00701"></a>00701 <span class="comment">// it on disk and in the cache table.</span>
<a name="l00702"></a>00702 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> cnt = 0; cnt < <a class="code" href="HTTPCacheTable_8cc.html#a17929d1ac6258253df584173f0c6e279">CACHE_TABLE_SIZE</a>; cnt++) {
<a name="l00703"></a>00703 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a36425575bbfac384964ce2f364f15679">HTTPCacheTable::CacheEntries</a> *slot = get_cache_table()[cnt];
<a name="l00704"></a>00704 <span class="keywordflow">if</span> (slot) {
<a name="l00705"></a>00705 for_each(slot->begin(), slot->end(), DeleteUnlockedCacheEntry(*<span class="keyword">this</span>));
<a name="l00706"></a>00706 slot->erase(<span class="keyword">remove</span>(slot->begin(), slot->end(), <span class="keyword">static_cast<</span><a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *<span class="keyword">></span>(0)),
<a name="l00707"></a>00707 slot->end());
<a name="l00708"></a>00708 }
<a name="l00709"></a>00709 }
<a name="l00710"></a>00710
<a name="l00711"></a>00711 <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a3e636690b069b3384e908135fcaebd51">cache_index_delete</a>();
<a name="l00712"></a>00712 }
<a name="l00713"></a>00713
<a name="l00727"></a>00727 <span class="keywordtype">void</span>
<a name="l00728"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a0ca63c76e70064549d128ff8f5951534">00728</a> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a0ca63c76e70064549d128ff8f5951534">HTTPCacheTable::calculate_time</a>(<a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *entry, <span class="keywordtype">int</span> default_expiration, time_t request_time)
<a name="l00729"></a>00729 {
<a name="l00730"></a>00730 entry->response_time = time(NULL);
<a name="l00731"></a>00731 time_t apparent_age = max(0, static_cast<int>(entry->response_time - entry->date));
<a name="l00732"></a>00732 time_t corrected_received_age = max(apparent_age, entry->age);
<a name="l00733"></a>00733 time_t response_delay = entry->response_time - request_time;
<a name="l00734"></a>00734 entry->corrected_initial_age = corrected_received_age + response_delay;
<a name="l00735"></a>00735
<a name="l00736"></a>00736 <span class="comment">// Estimate an expires time using the max-age and expires time. If we</span>
<a name="l00737"></a>00737 <span class="comment">// don't have an explicit expires time then set it to 10% of the LM date</span>
<a name="l00738"></a>00738 <span class="comment">// (although max 24 h). If no LM date is available then use 24 hours.</span>
<a name="l00739"></a>00739 time_t freshness_lifetime = entry->max_age;
<a name="l00740"></a>00740 <span class="keywordflow">if</span> (freshness_lifetime < 0) {
<a name="l00741"></a>00741 <span class="keywordflow">if</span> (entry->expires < 0) {
<a name="l00742"></a>00742 <span class="keywordflow">if</span> (entry->lm < 0) {
<a name="l00743"></a>00743 freshness_lifetime = default_expiration;
<a name="l00744"></a>00744 }
<a name="l00745"></a>00745 <span class="keywordflow">else</span> {
<a name="l00746"></a>00746 freshness_lifetime = <a class="code" href="HTTPCacheTable_8cc.html#ac34ecfc4f379afa6b7cbcf41c7781d0d">LM_EXPIRATION</a>(entry->date - entry->lm);
<a name="l00747"></a>00747 }
<a name="l00748"></a>00748 }
<a name="l00749"></a>00749 <span class="keywordflow">else</span>
<a name="l00750"></a>00750 freshness_lifetime = entry->expires - entry->date;
<a name="l00751"></a>00751 }
<a name="l00752"></a>00752
<a name="l00753"></a>00753 entry->freshness_lifetime = max(0, static_cast<int>(freshness_lifetime));
<a name="l00754"></a>00754
<a name="l00755"></a>00755 <a class="code" href="debug_8h.html#ac1f764c266c50f0050e33557004c914c">DBG2</a>(cerr << <span class="stringliteral">"Cache....... Received Age "</span> << entry->age
<a name="l00756"></a>00756 << <span class="stringliteral">", corrected "</span> << entry->corrected_initial_age
<a name="l00757"></a>00757 << <span class="stringliteral">", freshness lifetime "</span> << entry->freshness_lifetime << endl);
<a name="l00758"></a>00758 }
<a name="l00759"></a>00759
<a name="l00771"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a53379f3151fe6b85e85c75c401a14963">00771</a> <span class="keywordtype">void</span> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a53379f3151fe6b85e85c75c401a14963">HTTPCacheTable::parse_headers</a>(<a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *entry,
<a name="l00772"></a>00772 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> max_entry_size, <span class="keyword">const</span> vector<string> &headers) {
<a name="l00773"></a>00773 vector<string>::const_iterator i;
<a name="l00774"></a>00774 <span class="keywordflow">for</span> (i = headers.begin(); i != headers.end(); ++i) {
<a name="l00775"></a>00775 <span class="comment">// skip a blank header.</span>
<a name="l00776"></a>00776 <span class="keywordflow">if</span> ((*i).empty())
<a name="l00777"></a>00777 <span class="keywordflow">continue</span>;
<a name="l00778"></a>00778
<a name="l00779"></a>00779 string::size_type colon = (*i).find(<span class="charliteral">':'</span>);
<a name="l00780"></a>00780
<a name="l00781"></a>00781 <span class="comment">// skip a header with no colon in it.</span>
<a name="l00782"></a>00782 <span class="keywordflow">if</span> (colon == string::npos)
<a name="l00783"></a>00783 <span class="keywordflow">continue</span>;
<a name="l00784"></a>00784
<a name="l00785"></a>00785 <span class="keywordtype">string</span> header = (*i).substr(0, (*i).find(<span class="charliteral">':'</span>));
<a name="l00786"></a>00786 <span class="keywordtype">string</span> value = (*i).substr((*i).find(<span class="stringliteral">": "</span>) + 2);
<a name="l00787"></a>00787 <a class="code" href="debug_8h.html#ac1f764c266c50f0050e33557004c914c">DBG2</a>(cerr << <span class="stringliteral">"Header: "</span> << header << endl);<a class="code" href="debug_8h.html#ac1f764c266c50f0050e33557004c914c">DBG2</a>(cerr << <span class="stringliteral">"Value: "</span> << value << endl);
<a name="l00788"></a>00788
<a name="l00789"></a>00789 <span class="keywordflow">if</span> (header == <span class="stringliteral">"ETag"</span>) {
<a name="l00790"></a>00790 entry->etag = value;
<a name="l00791"></a>00791 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (header == <span class="stringliteral">"Last-Modified"</span>) {
<a name="l00792"></a>00792 entry->lm = <a class="code" href="namespacelibdap.html#abaf4e1a6a665dbfe9324b25ec9fa701a">parse_time</a>(value.c_str());
<a name="l00793"></a>00793 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (header == <span class="stringliteral">"Expires"</span>) {
<a name="l00794"></a>00794 entry->expires = <a class="code" href="namespacelibdap.html#abaf4e1a6a665dbfe9324b25ec9fa701a">parse_time</a>(value.c_str());
<a name="l00795"></a>00795 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (header == <span class="stringliteral">"Date"</span>) {
<a name="l00796"></a>00796 entry->date = <a class="code" href="namespacelibdap.html#abaf4e1a6a665dbfe9324b25ec9fa701a">parse_time</a>(value.c_str());
<a name="l00797"></a>00797 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (header == <span class="stringliteral">"Age"</span>) {
<a name="l00798"></a>00798 entry->age = <a class="code" href="namespacelibdap.html#abaf4e1a6a665dbfe9324b25ec9fa701a">parse_time</a>(value.c_str());
<a name="l00799"></a>00799 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (header == <span class="stringliteral">"Content-Length"</span>) {
<a name="l00800"></a>00800 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> clength = strtoul(value.c_str(), 0, 0);
<a name="l00801"></a>00801 <span class="keywordflow">if</span> (clength > max_entry_size)
<a name="l00802"></a>00802 entry-><a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html#a112b8ac8aa541ca9a06af7de4d80fc03">set_no_cache</a>(<span class="keyword">true</span>);
<a name="l00803"></a>00803 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (header == <span class="stringliteral">"Cache-Control"</span>) {
<a name="l00804"></a>00804 <span class="comment">// Ignored Cache-Control values: public, private, no-transform,</span>
<a name="l00805"></a>00805 <span class="comment">// proxy-revalidate, s-max-age. These are used by shared caches.</span>
<a name="l00806"></a>00806 <span class="comment">// See section 14.9 of RFC 2612. 10/02/02 jhrg</span>
<a name="l00807"></a>00807 <span class="keywordflow">if</span> (value == <span class="stringliteral">"no-cache"</span> || value == <span class="stringliteral">"no-store"</span>)
<a name="l00808"></a>00808 <span class="comment">// Note that we *can* store a 'no-store' response in volatile</span>
<a name="l00809"></a>00809 <span class="comment">// memory according to RFC 2616 (section 14.9.2) but those</span>
<a name="l00810"></a>00810 <span class="comment">// will be rare coming from DAP servers. 10/02/02 jhrg</span>
<a name="l00811"></a>00811 entry-><a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html#a112b8ac8aa541ca9a06af7de4d80fc03">set_no_cache</a>(<span class="keyword">true</span>);
<a name="l00812"></a>00812 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (value == <span class="stringliteral">"must-revalidate"</span>)
<a name="l00813"></a>00813 entry->must_revalidate = <span class="keyword">true</span>;
<a name="l00814"></a>00814 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (value.find(<span class="stringliteral">"max-age"</span>) != string::npos) {
<a name="l00815"></a>00815 <span class="keywordtype">string</span> max_age = value.substr(value.find(<span class="stringliteral">"="</span> + 1));
<a name="l00816"></a>00816 entry->max_age = <a class="code" href="namespacelibdap.html#abaf4e1a6a665dbfe9324b25ec9fa701a">parse_time</a>(max_age.c_str());
<a name="l00817"></a>00817 }
<a name="l00818"></a>00818 }
<a name="l00819"></a>00819 }
<a name="l00820"></a>00820 }
<a name="l00821"></a>00821
<a name="l00823"></a>00823
<a name="l00824"></a>00824 <span class="comment">// @TODO Change name to record locked response</span>
<a name="l00825"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#a24b2c86910ba623a59184ab42410b4cb">00825</a> <span class="keywordtype">void</span> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#a24b2c86910ba623a59184ab42410b4cb">HTTPCacheTable::bind_entry_to_data</a>(<a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *entry, FILE *body) {
<a name="l00826"></a>00826 entry->hits++; <span class="comment">// Mark hit</span>
<a name="l00827"></a>00827 d_locked_entries[body] = entry; <span class="comment">// record lock, see release_cached_r...</span>
<a name="l00828"></a>00828 }
<a name="l00829"></a>00829
<a name="l00830"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#ad0ac242f618a804562e18546738904df">00830</a> <span class="keywordtype">void</span> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#ad0ac242f618a804562e18546738904df">HTTPCacheTable::uncouple_entry_from_data</a>(FILE *body) {
<a name="l00831"></a>00831 <a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html">HTTPCacheTable::CacheEntry</a> *entry = d_locked_entries[body];
<a name="l00832"></a>00832 <span class="keywordflow">if</span> (!entry)
<a name="l00833"></a>00833 <span class="keywordflow">throw</span> <a class="code" href="classlibdap_1_1InternalErr.html" title="A class for software fault reporting.">InternalErr</a>(<span class="stringliteral">"There is no cache entry for the response given."</span>);
<a name="l00834"></a>00834
<a name="l00835"></a>00835 d_locked_entries.erase(body);
<a name="l00836"></a>00836 entry-><a class="code" href="structlibdap_1_1HTTPCacheTable_1_1CacheEntry.html#ae2db6d25b27dd657dd0a2ef553e28246">unlock_read_response</a>();
<a name="l00837"></a>00837
<a name="l00838"></a>00838 <span class="keywordflow">if</span> (entry->readers < 0)
<a name="l00839"></a>00839 <span class="keywordflow">throw</span> <a class="code" href="classlibdap_1_1InternalErr.html" title="A class for software fault reporting.">InternalErr</a>(<span class="stringliteral">"An unlocked entry was released"</span>);
<a name="l00840"></a>00840 }
<a name="l00841"></a>00841
<a name="l00842"></a><a class="code" href="classlibdap_1_1HTTPCacheTable.html#afc2ef03d687c3db809e2bfbc3bca3bd3">00842</a> <span class="keywordtype">bool</span> <a class="code" href="classlibdap_1_1HTTPCacheTable.html#afc2ef03d687c3db809e2bfbc3bca3bd3">HTTPCacheTable::is_locked_read_responses</a>() {
<a name="l00843"></a>00843 <span class="keywordflow">return</span> !d_locked_entries.empty();
<a name="l00844"></a>00844 }
<a name="l00845"></a>00845
<a name="l00846"></a>00846 } <span class="comment">// namespace libdap</span>
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