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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>DMTL: file_cache_manager.h Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.7 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="annotated.html"><span>Classes</span></a></li> <li id="current"><a href="files.html"><span>Files</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><h1>file_cache_manager.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span><a name="l00002"></a>00002 <span class="comment"> * Copyright (C) 2005 M.J. Zaki <zaki@cs.rpi.edu> Rensselaer Polytechnic Institute</span><a name="l00003"></a>00003 <span class="comment"> * Written by salems@cs.rpi.edu</span><a name="l00004"></a>00004 <span class="comment"> * Modifications:</span><a name="l00005"></a>00005 <span class="comment"> * added file cache deleting, and name passing -- Zaki 7/25/06</span><a name="l00006"></a>00006 <span class="comment"> *</span><a name="l00007"></a>00007 <span class="comment"> * This program is free software; you can redistribute it and/or</span><a name="l00008"></a>00008 <span class="comment"> * modify it under the terms of the GNU General Public License</span><a name="l00009"></a>00009 <span class="comment"> * as published by the Free Software Foundation; either version 2</span><a name="l00010"></a>00010 <span class="comment"> * of the License, or (at your option) any later version.</span><a name="l00011"></a>00011 <span class="comment"> *</span><a name="l00012"></a>00012 <span class="comment"> * This program is distributed in the hope that it will be useful,</span><a name="l00013"></a>00013 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span><a name="l00014"></a>00014 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span><a name="l00015"></a>00015 <span class="comment"> * GNU General Public License for more details.</span><a name="l00016"></a>00016 <span class="comment"> *</span><a name="l00017"></a>00017 <span class="comment"> * You should have received a copy of the GNU General Public License along</span><a name="l00018"></a>00018 <span class="comment"> * with this program; if not, write to the Free Software Foundation, Inc.,</span><a name="l00019"></a>00019 <span class="comment"> * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.</span><a name="l00020"></a>00020 <span class="comment"> */</span><a name="l00021"></a>00021 <span class="preprocessor">#ifndef FILE_CACHE_MANAGER_H</span><a name="l00022"></a>00022 <span class="preprocessor"></span><span class="preprocessor">#define FILE_CACHE_MANAGER_H</span><a name="l00023"></a>00023 <span class="preprocessor"></span><a name="l00024"></a>00024 <span class="preprocessor">#include<cstdio></span><a name="l00025"></a>00025 <span class="preprocessor">#include<map></span><a name="l00026"></a>00026 <span class="keyword">using namespace </span>std;<a name="l00027"></a>00027 <a name="l00034"></a>00034 <span class="keyword">template</span> <<span class="keyword">typename</span> Key, <span class="keyword">typename</span> Data><a name="l00035"></a><a class="code" href="classcache__manager.html">00035</a> <span class="keyword">class </span><a class="code" href="classcache__manager.html">cache_manager</a> {<a name="l00036"></a>00036 <a name="l00037"></a>00037 <span class="keyword">public</span>:<a name="l00040"></a>00040 <span class="keyword">typedef</span> Key key_type;<a name="l00041"></a>00041 <a name="l00044"></a>00044 <span class="keyword">typedef</span> Data data_type;<a name="l00045"></a>00045 <a name="l00046"></a>00046 <span class="keyword">typedef</span> std::map<Key, std::pair<bool,data_type*> > <a class="code" href="classstorage__type.html">storage_type</a>;<a name="l00047"></a>00047 <a name="l00050"></a>00050 <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> size_type;<a name="l00051"></a>00051 <a name="l00054"></a>00054 <span class="keyword">typedef</span> std::map< key_type, std::pair<unsigned long long,unsigned long long> , std::less< key_type > > FileMap;<a name="l00055"></a>00055 <a name="l00056"></a>00056 <span class="keyword">typedef</span> <span class="keyword">typename</span> FileMap::iterator File_Map_iter;<a name="l00062"></a>00062 <span class="keyword">typedef</span> <span class="keyword">typename</span> storage_type::iterator storage_iterator; <a name="l00063"></a>00063 <a name="l00066"></a>00066 <span class="keyword">typedef</span> <span class="keyword">typename</span> storage_type::const_iterator storage_const_iterator;<a name="l00067"></a>00067 <a name="l00070"></a>00070 <span class="keyword">typedef</span> <span class="keyword">typename</span> storage_type::value_type storage_entry_type;<a name="l00071"></a>00071 <a name="l00072"></a>00072 <a name="l00075"></a><a class="code" href="classcache__manager.html#ba5fa16961f39c468e34b300d1fb9cb3">00075</a> storage_iterator <a class="code" href="classcache__manager.html#ba5fa16961f39c468e34b300d1fb9cb3">begin</a>() { <span class="keywordflow">return</span> istorage_.begin(); }<a name="l00076"></a>00076 <a name="l00079"></a><a class="code" href="classcache__manager.html#8be2cfbdd55541f9062ccc44ea3bfdfe">00079</a> storage_iterator <a class="code" href="classcache__manager.html#8be2cfbdd55541f9062ccc44ea3bfdfe">end</a>() { <span class="keywordflow">return</span> istorage_.end(); }<a name="l00080"></a>00080 <a name="l00083"></a><a class="code" href="classcache__manager.html#e7ed7c050adaca879923abac6f5d6047">00083</a> storage_const_iterator <a class="code" href="classcache__manager.html#ba5fa16961f39c468e34b300d1fb9cb3">begin</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> istorage_.begin(); }<a name="l00084"></a>00084 <a name="l00087"></a><a class="code" href="classcache__manager.html#922983d3c3abd4a4e7a3cdb79c89da1e">00087</a> storage_const_iterator <a class="code" href="classcache__manager.html#8be2cfbdd55541f9062ccc44ea3bfdfe">end</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> istorage_.end(); }<a name="l00088"></a>00088 <a name="l00096"></a>00096 <span class="comment">// C can be equal 0.</span><a name="l00097"></a><a class="code" href="classcache__manager.html#be67aba05b7c6d9a2024c8f9319ad93c">00097</a> <span class="keyword">explicit</span> <a class="code" href="classcache__manager.html#be67aba05b7c6d9a2024c8f9319ad93c">cache_manager</a>(size_type C = 0,<span class="keyword">const</span> <span class="keywordtype">char</span>* filename)<a name="l00098"></a>00098 : size_(0), capacity_(C), istorage_(), offset(0), file_name(filename){<a name="l00099"></a>00099 my_file_.open(file_name.c_str(), <a name="l00100"></a>00100 std::ios::in|std::ios::out|std::ios::binary|ios::trunc); <a name="l00101"></a>00101 <a name="l00102"></a>00102 } <span class="comment">// explicit cache_manager</span><a name="l00103"></a>00103 <a name="l00104"></a>00104 <a name="l00105"></a>00105 ~<a class="code" href="classcache__manager.html">cache_manager</a>() {<a name="l00106"></a>00106 my_file_.close();<a name="l00107"></a>00107 <a name="l00108"></a>00108 <span class="keywordflow">if</span> (remove(file_name.c_str()) < 0){<a name="l00109"></a>00109 cerr << <span class="stringliteral">"Unable to remove backend file "</span> << file_name << endl;<a name="l00110"></a>00110 }<a name="l00111"></a>00111 }<a name="l00112"></a>00112 <a name="l00115"></a><a class="code" href="classcache__manager.html#ca8d59b60212e78e85ee2cbc2e5b9870">00115</a> <span class="keywordtype">void</span> <a class="code" href="classcache__manager.html#ca8d59b60212e78e85ee2cbc2e5b9870">clear</a>() {<a name="l00116"></a>00116 <a name="l00117"></a>00117 size_ = 0;<a name="l00118"></a>00118 istorage_.clear();<a name="l00119"></a>00119 file_map_.clear();<a name="l00120"></a>00120 } <span class="comment">// clear</span><a name="l00121"></a>00121 <a name="l00124"></a><a class="code" href="classcache__manager.html#9f7d02fe495568a8e16048ab00828422">00124</a> size_type <a class="code" href="classcache__manager.html#9f7d02fe495568a8e16048ab00828422">size</a>()<span class="keyword"> const </span>{ <a name="l00125"></a>00125 size_type S = size_;<a name="l00126"></a>00126 <span class="keywordflow">return</span> S; <a name="l00127"></a>00127 } <span class="comment">// size</span><a name="l00128"></a>00128 <a name="l00129"></a>00129 <a name="l00132"></a><a class="code" href="classcache__manager.html#61c2072deb860993db961f8685f9ec72">00132</a> size_type <a class="code" href="classcache__manager.html#61c2072deb860993db961f8685f9ec72">capacity</a>()<span class="keyword"> const </span>{<a name="l00133"></a>00133 size_type S = capacity_;<a name="l00134"></a>00134 <span class="keywordflow">return</span> S;<a name="l00135"></a>00135 } <span class="comment">// capacity</span><a name="l00136"></a>00136 <a name="l00139"></a><a class="code" href="classcache__manager.html#a5e33bc1a76a8abda917a8bd4b16c185">00139</a> size_type <a class="code" href="classcache__manager.html#a5e33bc1a76a8abda917a8bd4b16c185">mem_entries</a>()<span class="keyword"> const </span>{<a name="l00140"></a>00140 size_type S = istorage_.size();<a name="l00141"></a>00141 <span class="keywordflow">return</span> S;<a name="l00142"></a>00142 } <span class="comment">// no_entries</span><a name="l00143"></a>00143 <a name="l00146"></a><a class="code" href="classcache__manager.html#f55b3cf64d1a78bfb559de89e3bb387b">00146</a> <span class="keywordtype">void</span> <a class="code" href="classcache__manager.html#f55b3cf64d1a78bfb559de89e3bb387b">print_stats</a>()<span class="keyword"> const </span>{<a name="l00147"></a>00147 <span class="comment">//cout<<"size:"<<size_<<"offset:"<<offset<<endl;</span><a name="l00148"></a>00148 } <a name="l00151"></a><a class="code" href="classcache__manager.html#6eab4f430d20ff3317edee79d42e2c80">00151</a> size_type <a class="code" href="classcache__manager.html#6eab4f430d20ff3317edee79d42e2c80">file_entries</a>()<span class="keyword"> const </span>{<a name="l00152"></a>00152 size_type S = file_map_.size();<a name="l00153"></a>00153 <span class="keywordflow">return</span> S;<a name="l00154"></a>00154 } <span class="comment">// no_entries</span><a name="l00155"></a>00155 <a name="l00156"></a>00156 <a name="l00157"></a>00157 <a name="l00160"></a><a class="code" href="classcache__manager.html#c4d9cdc385af51659f3f4c8b72f3c2fc">00160</a> storage_const_iterator <a class="code" href="classcache__manager.html#c4d9cdc385af51659f3f4c8b72f3c2fc">find</a>(<span class="keyword">const</span> key_type& k)<span class="keyword"> const </span>{<a name="l00161"></a>00161 storage_const_iterator iter(istorage_.find(k));<a name="l00162"></a>00162 <span class="keywordflow">return</span> iter;<a name="l00163"></a>00163 } <span class="comment">// find</span><a name="l00164"></a>00164 <a name="l00165"></a>00165 <span class="keywordtype">void</span> lock_vat(<span class="keyword">const</span> key_type& k) {<a name="l00166"></a>00166 storage_iterator iter(istorage_.find(k));<a name="l00167"></a>00167 <span class="keywordflow">if</span> (iter != istorage_.end()) {<a name="l00168"></a>00168 iter->second.first=1;<a name="l00169"></a>00169 } <span class="comment">//if</span><a name="l00170"></a>00170 } <span class="comment">//lock_vat</span><a name="l00171"></a>00171 <a name="l00172"></a>00172 <span class="keywordtype">void</span> unlock_vat(<span class="keyword">const</span> key_type& k) {<a name="l00173"></a>00173 storage_iterator iter(istorage_.find(k));<a name="l00174"></a>00174 <span class="keywordflow">if</span> (iter != istorage_.end()) {<a name="l00175"></a>00175 iter->second.first=0;<a name="l00176"></a>00176 } <span class="comment">//if</span><a name="l00177"></a>00177 } <span class="comment">//unlock_vat</span><a name="l00178"></a>00178 <a name="l00182"></a><a class="code" href="classcache__manager.html#0c77b60bc1e2d57cf14f92a5e23473da">00182</a> <span class="keywordtype">void</span> <a class="code" href="classcache__manager.html#0c77b60bc1e2d57cf14f92a5e23473da">delete_vat</a>(<span class="keyword">const</span> key_type& k){<a name="l00183"></a>00183 storage_iterator iter(istorage_.find(k));<a name="l00184"></a>00184 <span class="keywordflow">if</span> (iter != istorage_.end()){ <span class="comment">//found in the memory_map</span><a name="l00185"></a>00185 size_ -= iter->second.second->byte_size();<a name="l00186"></a>00186 data_type* v =iter->second.second;<a name="l00187"></a>00187 <span class="keywordflow">if</span>(v){⌨️ 快捷键说明
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