_pion_plugin_8cpp-source.html

用c++编写http server的源码库,对socket等网络处理的代码可迅速转为己用.

<a name="l00138"></a>00138     boost::mutex::scoped_lock plugin_lock(m_plugin_mutex);
<a name="l00139"></a>00139     m_plugin_data = <span class="keyword">const_cast&lt;</span><a class="code" href="structpion_1_1_pion_plugin_1_1_pion_plugin_data.html">PionPluginData</a>*<span class="keyword">&gt;</span>(p.<a class="code" href="classpion_1_1_pion_plugin.html#7f531b8fb5fd4d7093619143bc242067" title="points to the shared library and functions used by the plug-in">m_plugin_data</a>);
<a name="l00140"></a>00140     <span class="keywordflow">if</span> (m_plugin_data != NULL) {
<a name="l00141"></a>00141         ++ m_plugin_data-&gt;<a class="code" href="structpion_1_1_pion_plugin_1_1_pion_plugin_data.html#8bf1caa36074d1af037f6c8732a2e002" title="number of references to this class">m_references</a>;
<a name="l00142"></a>00142     }
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144 
<a name="l00145"></a>00145 <span class="keywordtype">bool</span> PionPlugin::findFile(std::string&amp; path_to_file, <span class="keyword">const</span> std::string&amp; name,
<a name="l00146"></a>00146                           <span class="keyword">const</span> std::string&amp; extension)
<a name="l00147"></a>00147 {
<a name="l00148"></a>00148     <span class="comment">// first, try the name as-is</span>
<a name="l00149"></a>00149     <span class="keywordflow">if</span> (checkForFile(path_to_file, name, <span class="stringliteral">""</span>, extension))
<a name="l00150"></a>00150         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00151"></a>00151 
<a name="l00152"></a>00152     <span class="comment">// nope, check search paths</span>
<a name="l00153"></a>00153     boost::mutex::scoped_lock plugin_lock(m_plugin_mutex);
<a name="l00154"></a>00154     <span class="keywordflow">for</span> (std::vector&lt;std::string&gt;::iterator i = m_plugin_dirs.begin();
<a name="l00155"></a>00155          i != m_plugin_dirs.end(); ++i)
<a name="l00156"></a>00156     {
<a name="l00157"></a>00157         <span class="keywordflow">if</span> (checkForFile(path_to_file, *i, name, extension))
<a name="l00158"></a>00158             <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00159"></a>00159     }
<a name="l00160"></a>00160     
<a name="l00161"></a>00161     <span class="comment">// no plug-in file found</span>
<a name="l00162"></a>00162     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 
<a name="l00165"></a>00165 <span class="keywordtype">bool</span> PionPlugin::checkForFile(std::string&amp; final_path, <span class="keyword">const</span> std::string&amp; start_path,
<a name="l00166"></a>00166                               <span class="keyword">const</span> std::string&amp; name, <span class="keyword">const</span> std::string&amp; extension)
<a name="l00167"></a>00167 {
<a name="l00168"></a>00168     <span class="comment">// check for cygwin path oddities</span>
<a name="l00169"></a>00169     boost::filesystem::path cygwin_safe_path(start_path);
<a name="l00170"></a>00170     <a class="code" href="classpion_1_1_pion_plugin.html#b84026edef087fb963e6a828d4b8f730">checkCygwinPath</a>(cygwin_safe_path, start_path);
<a name="l00171"></a>00171     boost::filesystem::path test_path(cygwin_safe_path);
<a name="l00172"></a>00172 
<a name="l00173"></a>00173     <span class="comment">// if a name is specified, append it to the test path</span>
<a name="l00174"></a>00174     <span class="keywordflow">if</span> (! name.empty())
<a name="l00175"></a>00175         test_path /= name;
<a name="l00176"></a>00176 
<a name="l00177"></a>00177     <span class="comment">// check for existence of plug-in (without extension)       </span>
<a name="l00178"></a>00178     <span class="keywordflow">if</span> (boost::filesystem::exists(test_path)) {
<a name="l00179"></a>00179         final_path = test_path.file_string();
<a name="l00180"></a>00180         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00181"></a>00181     }
<a name="l00182"></a>00182         
<a name="l00183"></a>00183     <span class="comment">// next, try appending the plug-in extension        </span>
<a name="l00184"></a>00184     <span class="keywordflow">if</span> (name.empty()) {
<a name="l00185"></a>00185         <span class="comment">// no "name" specified -&gt; append it directly to start_path</span>
<a name="l00186"></a>00186         test_path = boost::filesystem::path(start_path + extension);
<a name="l00187"></a>00187         <span class="comment">// in this case, we need to re-check for the cygwin oddities</span>
<a name="l00188"></a>00188         <a class="code" href="classpion_1_1_pion_plugin.html#b84026edef087fb963e6a828d4b8f730">checkCygwinPath</a>(test_path, start_path + extension);
<a name="l00189"></a>00189     } <span class="keywordflow">else</span> {
<a name="l00190"></a>00190         <span class="comment">// name is specified, so we can just re-use cygwin_safe_path</span>
<a name="l00191"></a>00191         test_path = cygwin_safe_path /
<a name="l00192"></a>00192             boost::filesystem::path(name + extension);
<a name="l00193"></a>00193     }
<a name="l00194"></a>00194 
<a name="l00195"></a>00195     <span class="comment">// re-check for existence of plug-in (after adding extension)       </span>
<a name="l00196"></a>00196     <span class="keywordflow">if</span> (boost::filesystem::exists(test_path)) {
<a name="l00197"></a>00197         final_path = test_path.file_string();
<a name="l00198"></a>00198         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00199"></a>00199     }
<a name="l00200"></a>00200     
<a name="l00201"></a>00201     <span class="comment">// no plug-in file found</span>
<a name="l00202"></a>00202     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00203"></a>00203 }
<a name="l00204"></a>00204 
<a name="l00205"></a>00205 <span class="keywordtype">void</span> PionPlugin::openPlugin(<span class="keyword">const</span> std::string&amp; plugin_file,
<a name="l00206"></a>00206                             PionPluginData&amp; plugin_data)
<a name="l00207"></a>00207 {
<a name="l00208"></a>00208     <span class="comment">// get the name of the plugin (for create/destroy symbol names)</span>
<a name="l00209"></a>00209     plugin_data.m_plugin_name = <a class="code" href="classpion_1_1_pion_plugin.html#693a3b35e4b8086ef33c11cffdab3491" title="returns the name of the plugin that is currently open">getPluginName</a>(plugin_file);
<a name="l00210"></a>00210     
<a name="l00211"></a>00211     <span class="comment">// attempt to open the plugin; note that this tries all search paths</span>
<a name="l00212"></a>00212     <span class="comment">// and also tries a variety of platform-specific extensions</span>
<a name="l00213"></a>00213     plugin_data.m_lib_handle = loadDynamicLibrary(plugin_file.c_str());
<a name="l00214"></a>00214     <span class="keywordflow">if</span> (plugin_data.m_lib_handle == NULL)
<a name="l00215"></a>00215         <span class="keywordflow">throw</span> PluginNotFoundException(plugin_file);
<a name="l00216"></a>00216     
<a name="l00217"></a>00217     <span class="comment">// find the function used to create new plugin objects</span>
<a name="l00218"></a>00218     plugin_data.m_create_func =
<a name="l00219"></a>00219         getLibrarySymbol(plugin_data.m_lib_handle,
<a name="l00220"></a>00220                          PION_PLUGIN_CREATE + plugin_data.m_plugin_name);
<a name="l00221"></a>00221     <span class="keywordflow">if</span> (plugin_data.m_create_func == NULL) {
<a name="l00222"></a>00222         closeDynamicLibrary(plugin_data.m_lib_handle);
<a name="l00223"></a>00223         <span class="keywordflow">throw</span> PluginMissingCreateException(plugin_file);
<a name="l00224"></a>00224     }
<a name="l00225"></a>00225 
<a name="l00226"></a>00226     <span class="comment">// find the function used to destroy existing plugin objects</span>
<a name="l00227"></a>00227     plugin_data.m_destroy_func =
<a name="l00228"></a>00228         getLibrarySymbol(plugin_data.m_lib_handle,
<a name="l00229"></a>00229                          PION_PLUGIN_DESTROY + plugin_data.m_plugin_name);
<a name="l00230"></a>00230     <span class="keywordflow">if</span> (plugin_data.m_destroy_func == NULL) {
<a name="l00231"></a>00231         closeDynamicLibrary(plugin_data.m_lib_handle);
<a name="l00232"></a>00232         <span class="keywordflow">throw</span> PluginMissingDestroyException(plugin_file);
<a name="l00233"></a>00233     }
<a name="l00234"></a>00234 }
<a name="l00235"></a>00235 
<a name="l00236"></a>00236 std::string <a class="code" href="classpion_1_1_pion_plugin.html#693a3b35e4b8086ef33c11cffdab3491" title="returns the name of the plugin that is currently open">PionPlugin::getPluginName</a>(<span class="keyword">const</span> std::string&amp; plugin_file)
<a name="l00237"></a>00237 {
<a name="l00238"></a>00238     <span class="comment">// strip path</span>
<a name="l00239"></a>00239 <span class="preprocessor">#ifdef PION_WIN32</span>
<a name="l00240"></a>00240 <span class="preprocessor"></span>    std::string::size_type pos = plugin_file.find_last_of(<span class="charliteral">'\\'</span>);
<a name="l00241"></a>00241 <span class="preprocessor">#else</span>
<a name="l00242"></a>00242 <span class="preprocessor"></span>    std::string::size_type pos = plugin_file.find_last_of(<span class="charliteral">'/'</span>);
<a name="l00243"></a>00243 <span class="preprocessor">#endif</span>
<a name="l00244"></a>00244 <span class="preprocessor"></span>    std::string plugin_name = (pos == std::string::npos ?
<a name="l00245"></a>00245                                plugin_file : plugin_file.substr(pos+1));
<a name="l00246"></a>00246     pos = plugin_name.find(<span class="charliteral">'.'</span>);
<a name="l00247"></a>00247 
<a name="l00248"></a>00248     <span class="comment">// truncate extension</span>
<a name="l00249"></a>00249     <span class="keywordflow">if</span> (pos != std::string::npos)
<a name="l00250"></a>00250         plugin_name.resize(pos);
<a name="l00251"></a>00251                             
<a name="l00252"></a>00252     <span class="keywordflow">return</span> plugin_name;                     
<a name="l00253"></a>00253 }
<a name="l00254"></a>00254 
<a name="l00255"></a>00255 <span class="keywordtype">void</span> *PionPlugin::loadDynamicLibrary(<span class="keyword">const</span> std::string&amp; plugin_file)
<a name="l00256"></a>00256 {
<a name="l00257"></a>00257 <span class="preprocessor">#ifdef PION_WIN32</span>
<a name="l00258"></a>00258 <span class="preprocessor"></span>    <span class="keywordflow">return</span> LoadLibrary(plugin_file.c_str());
<a name="l00259"></a>00259 <span class="preprocessor">#else</span>
<a name="l00260"></a>00260 <span class="preprocessor"></span>    <span class="keywordflow">return</span> dlopen(plugin_file.c_str(), RTLD_LAZY);
<a name="l00261"></a>00261 <span class="preprocessor">#endif</span>
<a name="l00262"></a>00262 <span class="preprocessor"></span>}
<a name="l00263"></a>00263 
<a name="l00264"></a>00264 <span class="keywordtype">void</span> PionPlugin::closeDynamicLibrary(<span class="keywordtype">void</span> *lib_handle)
<a name="l00265"></a>00265 {
<a name="l00266"></a>00266 <span class="preprocessor">#ifdef PION_WIN32</span>
<a name="l00267"></a>00267 <span class="preprocessor"></span>    FreeLibrary((HINSTANCE) lib_handle);
<a name="l00268"></a>00268 <span class="preprocessor">#else</span>
<a name="l00269"></a>00269 <span class="preprocessor"></span>    dlclose(lib_handle);
<a name="l00270"></a>00270 <span class="preprocessor">#endif</span>
<a name="l00271"></a>00271 <span class="preprocessor"></span>}
<a name="l00272"></a>00272 
<a name="l00273"></a>00273 <span class="keywordtype">void</span> *PionPlugin::getLibrarySymbol(<span class="keywordtype">void</span> *lib_handle, <span class="keyword">const</span> std::string&amp; symbol)
<a name="l00274"></a>00274 {
<a name="l00275"></a>00275 <span class="preprocessor">#ifdef PION_WIN32</span>
<a name="l00276"></a>00276 <span class="preprocessor"></span>    <span class="keywordflow">return</span> (<span class="keywordtype">void</span>*)GetProcAddress((HINSTANCE) lib_handle, symbol.c_str());
<a name="l00277"></a>00277 <span class="preprocessor">#else</span>
<a name="l00278"></a>00278 <span class="preprocessor"></span>    <span class="keywordflow">return</span> dlsym(lib_handle, symbol.c_str());
<a name="l00279"></a>00279 <span class="preprocessor">#endif</span>
<a name="l00280"></a>00280 <span class="preprocessor"></span>}
<a name="l00281"></a>00281 
<a name="l00282"></a>00282 }   <span class="comment">// end namespace pion</span>
</pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Tue Jun 19 13:29:22 2007 for libpion by&nbsp;
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