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//***********************************************************
// Copyright © 2008 Valentin Pavlyuchenko
//
// This file is part of Boltun.
//
// Boltun is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Boltun is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Boltun. If not, see <http://www.gnu.org/licenses/>.
//
//***********************************************************
#ifndef PerContactDataH
#define PerContactDataH
#include "CriticalSection.h"
static std::map<unsigned, void*> perContactDataObjects;
template <class Source, class Data, class ContactHandle>
class PerContactData
{
template <class Source, class Data>
struct InternalData
{
CriticalSection lock;
Data *data;
time_t time;
inline InternalData(const Source& src)
:time(0)
{
data = new Data(src);
}
inline InternalData()
:data(NULL)
{
assert(false);
}
inline ~InternalData()
{
delete data;
}
};
CriticalSection mapLock;
unsigned timerID;
std::map<ContactHandle, InternalData<Source, Data>* > datas;
typedef typename std::map<ContactHandle, InternalData<Source, Data>* >::iterator mapIt;
const Source& source;
void CleanupData();
template <class Source, class Data, class ContactHandle>
friend VOID CALLBACK RunTimerProc(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime);
public:
PerContactData(const Source& src);
~PerContactData();
Data* GetData(ContactHandle Contact);
void PutData(ContactHandle Contact);
};
template <class Source, class Data, class ContactHandle>
PerContactData<Source, Data, ContactHandle>::PerContactData(const Source& src)
:source(src), timerID(0)
{
}
template <class Source, class Data, class ContactHandle>
PerContactData<Source, Data, ContactHandle>::~PerContactData()
{
mapLock.Enter();
if (timerID)
{
KillTimer(NULL, timerID);
perContactDataObjects.erase(timerID);
}
while (!datas.empty())
{
while (!(*datas.begin()).second->lock.TryEnter())
{
mapLock.Leave();
Sleep(10);
mapLock.Enter();
}
//Now we know exactly that no-one onws a contact lock
InternalData<Source, Data>* data = (*datas.begin()).second;
data->lock.Leave();
delete data;
datas.erase(datas.begin());
}
mapLock.Leave();
}
template <class Source, class Data, class ContactHandle>
Data* PerContactData<Source, Data, ContactHandle>::GetData(ContactHandle Contact)
{
mapLock.Enter();
mapIt it;
if ((it = datas.find(Contact)) == datas.end())
it = datas.insert(make_pair(Contact, new InternalData<Source, Data>(source))).first;
(*it).second->lock.Enter();
(*it).second->time = 0;
Data* data = (*it).second->data;
mapLock.Leave();
return data;
}
template <class Source, class Data, class ContactHandle>
void PerContactData<Source, Data, ContactHandle>::PutData(ContactHandle Contact)
{
mapLock.Enter();
datas[Contact]->lock.Leave();
::time(&(datas[Contact]->time));
if (!timerID)
{
timerID = SetTimer(NULL, 0, 30000, RunTimerProc<Source, Data, ContactHandle>);
assert(timerID);
perContactDataObjects[timerID] = this;
}
mapLock.Leave();
}
template <class Source, class Data, class ContactHandle>
void PerContactData<Source, Data, ContactHandle>::CleanupData()
{
mapLock.Enter();
time_t now;
time(&now);
for (mapIt it = datas.begin(); it != datas.end(); )
{
if ((*it).second->time) //it's being in use
{
int diff = (int)difftime(now, (*it).second->time);
if (diff >= 30*60) //half of an hour
{
mapIt tmp = it;
it++;
delete (*tmp).second;
datas.erase(tmp);
}
else
it++;
}
else
it++;
}
if (timerID && datas.empty()) //timerID may become NULL before locking, so should check
{
KillTimer(NULL, timerID);
perContactDataObjects.erase(timerID);
}
mapLock.Leave();
}
template <class Source, class Data, class ContactHandle>
VOID CALLBACK RunTimerProc(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
{
PerContactData<Source, Data, ContactHandle>* val = (PerContactData<Source, Data, ContactHandle>*)perContactDataObjects[idEvent];
val->CleanupData();
}
#endif /* PerContactDataH */
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