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<h1>cpool.h</h1><a href="cpool_8h.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
<a name="l00003"></a>00003
<a name="l00004"></a>00004 <span class="comment">/***********************************************************************</span>
<a name="l00005"></a>00005 <span class="comment"> Copyright (c) 2007-2008 by Educational Technology Resources, Inc. and</span>
<a name="l00006"></a>00006 <span class="comment"> (c) 2007 by Jonathan Wakely. Others may also hold copyrights on</span>
<a name="l00007"></a>00007 <span class="comment"> code in this file. See the CREDITS.txt file in the top directory</span>
<a name="l00008"></a>00008 <span class="comment"> of the distribution for details.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment"> This file is part of MySQL++.</span>
<a name="l00011"></a>00011 <span class="comment"></span>
<a name="l00012"></a>00012 <span class="comment"> MySQL++ is free software; you can redistribute it and/or modify it</span>
<a name="l00013"></a>00013 <span class="comment"> under the terms of the GNU Lesser General Public License as published</span>
<a name="l00014"></a>00014 <span class="comment"> by the Free Software Foundation; either version 2.1 of the License, or</span>
<a name="l00015"></a>00015 <span class="comment"> (at your option) any later version.</span>
<a name="l00016"></a>00016 <span class="comment"></span>
<a name="l00017"></a>00017 <span class="comment"> MySQL++ is distributed in the hope that it will be useful, but WITHOUT</span>
<a name="l00018"></a>00018 <span class="comment"> ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or</span>
<a name="l00019"></a>00019 <span class="comment"> FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public</span>
<a name="l00020"></a>00020 <span class="comment"> License for more details.</span>
<a name="l00021"></a>00021 <span class="comment"></span>
<a name="l00022"></a>00022 <span class="comment"> You should have received a copy of the GNU Lesser General Public</span>
<a name="l00023"></a>00023 <span class="comment"> License along with MySQL++; if not, write to the Free Software</span>
<a name="l00024"></a>00024 <span class="comment"> Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301</span>
<a name="l00025"></a>00025 <span class="comment"> USA</span>
<a name="l00026"></a>00026 <span class="comment">***********************************************************************/</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="preprocessor">#if !defined(MYSQLPP_CPOOL_H)</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span><span class="preprocessor">#define MYSQLPP_CPOOL_H</span>
<a name="l00030"></a>00030 <span class="preprocessor"></span>
<a name="l00031"></a>00031 <span class="preprocessor">#include "<a class="code" href="beemutex_8h.html">beemutex.h</a>"</span>
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="preprocessor">#include <list></span>
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="preprocessor">#include <assert.h></span>
<a name="l00036"></a>00036 <span class="preprocessor">#include <time.h></span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keyword">namespace </span>mysqlpp {
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="preprocessor">#if !defined(DOXYGEN_IGNORE)</span>
<a name="l00041"></a>00041 <span class="preprocessor"></span><span class="comment">// Make Doxygen ignore this</span>
<a name="l00042"></a>00042 <span class="keyword">class </span>MYSQLPP_EXPORT Connection;
<a name="l00043"></a>00043 <span class="preprocessor">#endif</span>
<a name="l00044"></a>00044 <span class="preprocessor"></span>
<a name="l00067"></a>00067
<a name="l00068"></a><a class="code" href="classmysqlpp_1_1ConnectionPool.html">00068</a> <span class="keyword">class </span>MYSQLPP_EXPORT ConnectionPool
<a name="l00069"></a>00069 {
<a name="l00070"></a>00070 <span class="keyword">public</span>:
<a name="l00072"></a><a class="code" href="classmysqlpp_1_1ConnectionPool.html#cc1262db33d586284651825ff076a8d7">00072</a> ConnectionPool() { }
<a name="l00073"></a>00073
<a name="l00078"></a><a class="code" href="classmysqlpp_1_1ConnectionPool.html#2cee954229416e24da07f5e208b35b09">00078</a> <span class="keyword">virtual</span> ~ConnectionPool() { assert(empty()); }
<a name="l00079"></a>00079
<a name="l00081"></a><a class="code" href="classmysqlpp_1_1ConnectionPool.html#264ea3fc4311c8bfd18e7d7b6103d124">00081</a> <span class="keywordtype">bool</span> empty()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> pool_.empty(); }
<a name="l00082"></a>00082
<a name="l00106"></a>00106 <span class="keyword">virtual</span> Connection* exchange(<span class="keyword">const</span> Connection* pc);
<a name="l00107"></a>00107
<a name="l00120"></a>00120 <span class="keyword">virtual</span> Connection* grab();
<a name="l00121"></a>00121
<a name="l00137"></a>00137 <span class="keyword">virtual</span> <span class="keywordtype">void</span> release(<span class="keyword">const</span> Connection* pc);
<a name="l00138"></a>00138
<a name="l00150"></a>00150 <span class="keywordtype">void</span> remove(<span class="keyword">const</span> Connection* pc);
<a name="l00151"></a>00151
<a name="l00162"></a>00162 <span class="keyword">virtual</span> Connection* safe_grab();
<a name="l00163"></a>00163
<a name="l00165"></a><a class="code" href="classmysqlpp_1_1ConnectionPool.html#c410ed5cb3032aed048fb3a275629654">00165</a> <span class="keywordtype">void</span> shrink() { clear(<span class="keyword">false</span>); }
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="keyword">protected</span>:
<a name="l00176"></a>00176 <span class="keywordtype">void</span> clear(<span class="keywordtype">bool</span> all = <span class="keyword">true</span>);
<a name="l00177"></a>00177
<a name="l00188"></a>00188 <span class="keyword">virtual</span> Connection* create() = 0;
<a name="l00189"></a>00189
<a name="l00197"></a>00197 <span class="keyword">virtual</span> <span class="keywordtype">void</span> destroy(Connection*) = 0;
<a name="l00198"></a>00198
<a name="l00207"></a>00207 <span class="keyword">virtual</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> max_idle_time() = 0;
<a name="l00208"></a>00208
<a name="l00210"></a><a class="code" href="classmysqlpp_1_1ConnectionPool.html#3a42387a44afad4c3d3895ba89ded21d">00210</a> size_t size()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> pool_.size(); }
<a name="l00211"></a>00211
<a name="l00212"></a>00212 <span class="keyword">private</span>:
<a name="l00214"></a>00214 <span class="keyword">struct </span>ConnectionInfo {
<a name="l00215"></a>00215 Connection* conn;
<a name="l00216"></a>00216 time_t last_used;
<a name="l00217"></a>00217 <span class="keywordtype">bool</span> in_use;
<a name="l00218"></a>00218
<a name="l00219"></a>00219 ConnectionInfo(Connection* c) :
<a name="l00220"></a>00220 conn(c),
<a name="l00221"></a>00221 last_used(time(0)),
<a name="l00222"></a>00222 in_use(true)
<a name="l00223"></a>00223 {
<a name="l00224"></a>00224 }
<a name="l00225"></a>00225
<a name="l00226"></a>00226 <span class="comment">// Strict weak ordering for ConnectionInfo objects.</span>
<a name="l00227"></a>00227 <span class="comment">// </span>
<a name="l00228"></a>00228 <span class="comment">// This ordering defines all in-use connections to be "less</span>
<a name="l00229"></a>00229 <span class="comment">// than" those not in use. Within each group, connections</span>
<a name="l00230"></a>00230 <span class="comment">// less recently touched are less than those more recent.</span>
<a name="l00231"></a>00231 <span class="keywordtype">bool</span> operator<(<span class="keyword">const</span> ConnectionInfo& rhs)<span class="keyword"> const</span>
<a name="l00232"></a>00232 <span class="keyword"> </span>{
<a name="l00233"></a>00233 <span class="keyword">const</span> ConnectionInfo& lhs = *<span class="keyword">this</span>;
<a name="l00234"></a>00234 <span class="keywordflow">return</span> lhs.in_use == rhs.in_use ?
<a name="l00235"></a>00235 lhs.last_used < rhs.last_used :
<a name="l00236"></a>00236 lhs.in_use;
<a name="l00237"></a>00237 }
<a name="l00238"></a>00238 };
<a name="l00239"></a>00239 <span class="keyword">typedef</span> std::list<ConnectionInfo> PoolT;
<a name="l00240"></a>00240 <span class="keyword">typedef</span> PoolT::iterator PoolIt;
<a name="l00241"></a>00241
<a name="l00243"></a>00243 Connection* find_mru();
<a name="l00244"></a>00244 <span class="keywordtype">void</span> remove(<span class="keyword">const</span> PoolIt& it);
<a name="l00245"></a>00245 <span class="keywordtype">void</span> remove_old_connections();
<a name="l00246"></a>00246
<a name="l00248"></a>00248 PoolT pool_;
<a name="l00249"></a>00249 BeecryptMutex mutex_;
<a name="l00250"></a>00250 };
<a name="l00251"></a>00251
<a name="l00252"></a>00252 } <span class="comment">// end namespace mysqlpp</span>
<a name="l00253"></a>00253
<a name="l00254"></a>00254 <span class="preprocessor">#endif // !defined(MYSQLPP_CPOOL_H)</span>
<a name="l00255"></a>00255 <span class="preprocessor"></span>
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