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//
// SessionPool.cpp
//
// $Id: //poco/Main/Data/src/SessionPool.cpp#2 $
//
// Library: Data
// Package: SessionPooling
// Module: SessionPool
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#include "Poco/Data/SessionPool.h"
#include "Poco/Data/SessionFactory.h"
#include "Poco/Data/DataException.h"
#include <algorithm>
namespace Poco {
namespace Data {
SessionPool::SessionPool(const std::string& sessionKey, const std::string& initString, int minSessions, int maxSessions, int idleTime):
_sessionKey(sessionKey),
_initString(initString),
_minSessions(minSessions),
_maxSessions(maxSessions),
_idleTime(idleTime),
_nSessions(0),
_janitorTimer(idleTime, idleTime/4)
{
Poco::TimerCallback<SessionPool> callback(*this, &SessionPool::onJanitorTimer);
_janitorTimer.start(callback);
}
SessionPool::~SessionPool()
{
_janitorTimer.stop();
}
Session SessionPool::get()
{
Poco::FastMutex::ScopedLock lock(_mutex);
purgeDeadSessions();
if (_idleSessions.empty())
{
if (_nSessions < _maxSessions)
{
Session newSession(SessionFactory::instance().create(_sessionKey, _initString));
PooledSessionHolderPtr pHolder(new PooledSessionHolder(*this, newSession.impl()));
_idleSessions.push_front(pHolder);
++_nSessions;
}
else throw SessionPoolExhaustedException(_sessionKey, _initString);
}
PooledSessionHolderPtr pHolder(_idleSessions.front());
PooledSessionImplPtr pPSI(new PooledSessionImpl(pHolder));
_activeSessions.push_front(pHolder);
_idleSessions.pop_front();
return Session(pPSI);
}
void SessionPool::purgeDeadSessions()
{
SessionList::iterator it = _idleSessions.begin();
for (; it != _idleSessions.end(); )
{
if (!(*it)->session()->isConnected())
{
it = _idleSessions.erase(it);
--_nSessions;
}
else ++it;
}
}
int SessionPool::capacity() const
{
return _maxSessions;
}
int SessionPool::used() const
{
Poco::FastMutex::ScopedLock lock(_mutex);
return (int) _activeSessions.size();
}
int SessionPool::idle() const
{
Poco::FastMutex::ScopedLock lock(_mutex);
return (int) _idleSessions.size();
}
int SessionPool::dead()
{
Poco::FastMutex::ScopedLock lock(_mutex);
int count = 0;
SessionList::iterator it = _activeSessions.begin();
SessionList::iterator itEnd = _activeSessions.end();
for (; it != itEnd; ++it)
{
if (!(*it)->session()->isConnected())
++count;
}
return count;
}
int SessionPool::allocated() const
{
Poco::FastMutex::ScopedLock lock(_mutex);
return _nSessions;
}
int SessionPool::available() const
{
return _maxSessions - used();
}
void SessionPool::putBack(PooledSessionHolderPtr pHolder)
{
Poco::FastMutex::ScopedLock lock(_mutex);
SessionList::iterator it = std::find(_activeSessions.begin(), _activeSessions.end(), pHolder);
if (it != _activeSessions.end())
{
if (pHolder->session()->isConnected())
{
pHolder->access();
_idleSessions.push_front(pHolder);
}
else --_nSessions;
_activeSessions.erase(it);
}
else
{
poco_bugcheck_msg("Unknown session passed to SessionPool::putBack()");
}
}
void SessionPool::onJanitorTimer(Poco::Timer&)
{
Poco::FastMutex::ScopedLock lock(_mutex);
SessionList::iterator it = _idleSessions.begin();
while (_nSessions > _minSessions && it != _idleSessions.end())
{
if ((*it)->idle() > _idleTime || !(*it)->session()->isConnected())
{
try
{
(*it)->session()->close();
}
catch (...)
{
}
it = _idleSessions.erase(it);
--_nSessions;
}
else ++it;
}
}
} } // namespace Poco::Data