126 lines
3.6 KiB
C++
126 lines
3.6 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2006 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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//$Id: pool.hpp 39 2005-04-10 20:39:53Z pavlenko $
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#ifndef POOL_HPP
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#define POOL_HPP
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// stl
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#include <iostream>
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#include <map>
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#include <deque>
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#include <ctime>
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// boost
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#include <boost/shared_ptr.hpp>
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#include <boost/thread/mutex.hpp>
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#include <boost/utility.hpp>
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// mapnik
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#include <mapnik/utils.hpp>
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namespace mapnik
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{
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template <typename T, typename PoolT>
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class PoolGuard
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{
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private:
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const T& obj_;
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PoolT& pool_;
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public:
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explicit PoolGuard(const T& ptr,PoolT& pool)
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: obj_(ptr),
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pool_(pool) {}
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~PoolGuard()
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{
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pool_->returnObject(obj_);
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}
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private:
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PoolGuard();
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PoolGuard(const PoolGuard&);
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PoolGuard& operator=(const PoolGuard&);
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};
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template <typename T,template <typename> class Creator>
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class Pool : private boost::noncopyable
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{
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typedef boost::shared_ptr<T> HolderType;
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typedef std::deque<HolderType> ContType;
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Creator<T> creator_;
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const int initialSize_;
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const int maxSize_;
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ContType usedPool_;
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ContType unusedPool_;
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boost::mutex mutex_;
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public:
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Pool(const Creator<T>& creator,int initialSize=5,int maxSize=20)
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:creator_(creator),
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initialSize_(initialSize),
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maxSize_(maxSize)
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{
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for (int i=0;i<initialSize_;++i)
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{
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unusedPool_.push_back(HolderType(creator_()));
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}
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}
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const HolderType& borrowObject()
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{
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mutex::scoped_lock lock(mutex_);
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typename ContType::iterator itr=unusedPool_.begin();
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if (itr!=unusedPool_.end())
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{
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#ifdef MAPNIK_DEBUG
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std::clog<<"borrow "<<(*itr).get()<<"\n";
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#endif
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usedPool_.push_back(*itr);
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itr=unusedPool_.erase(itr);
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return usedPool_[usedPool_.size()-1];
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}
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static const HolderType defaultObj;
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return defaultObj;
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}
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void returnObject(const HolderType& obj)
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{
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mutex::scoped_lock lock(mutex_);
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typename ContType::iterator itr=usedPool_.begin();
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while (itr != usedPool_.end())
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{
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if (obj.get()==(*itr).get())
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{
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#ifdef MAPNIK_DEBUG
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std::clog<<"return "<<(*itr).get()<<"\n";
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#endif
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unusedPool_.push_back(*itr);
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usedPool_.erase(itr);
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return;
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}
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++itr;
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}
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}
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};
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}
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#endif //POOL_HPP
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