/*
 * Copyright: JessMA Open Source (ldcsaa@gmail.com)
 *
 * Author	: Bruce Liang
 * Website	: https://github.com/ldcsaa
 * Project	: https://github.com/ldcsaa/HP-Socket
 * Blog		: http://www.cnblogs.com/ldcsaa
 * Wiki		: http://www.oschina.net/p/hp-socket
 * QQ Group	: 44636872, 75375912
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#include "UdpServer.h"

#ifdef _UDP_SUPPORT

EnHandleResult CUdpServer::TriggerFireAccept(TUdpSocketObj* pSocketObj)
{
	EnHandleResult rs = TRIGGER(FireAccept(pSocketObj));

	return rs;
}

BOOL CUdpServer::Start(LPCTSTR lpszBindAddress, USHORT usPort)
{
	if(!CheckParams() || !CheckStarting())
		return FALSE;

	PrepareStart();

	if(CreateListenSocket(lpszBindAddress, usPort))
		if(CreateWorkerThreads())
			if(StartAccept())
			{
				m_enState = SS_STARTED;
				return TRUE;
			}

	EXECUTE_RESTORE_ERROR(Stop());

	return FALSE;
}

void CUdpServer::SetLastError(EnSocketError code, LPCSTR func, int ec)
{
	m_enLastError = code;
	::SetLastError(ec);
}

BOOL CUdpServer::CheckParams()
{
	if	((m_enSendPolicy >= SP_PACK && m_enSendPolicy <= SP_DIRECT)								&&
		(m_enOnSendSyncPolicy >= OSSP_NONE && m_enOnSendSyncPolicy <= OSSP_RECEIVE)				&&
		((int)m_dwMaxConnectionCount > 0 && m_dwMaxConnectionCount <= MAX_CONNECTION_COUNT)		&&
		((int)m_dwWorkerThreadCount > 0 && m_dwWorkerThreadCount <= MAX_WORKER_THREAD_COUNT)	&&
		((int)m_dwFreeSocketObjLockTime >= 1000)												&&
		((int)m_dwFreeSocketObjPool >= 0)														&&
		((int)m_dwFreeBufferObjPool >= 0)														&&
		((int)m_dwFreeSocketObjHold >= 0)														&&
		((int)m_dwFreeBufferObjHold >= 0)														&&
		((int)m_dwMaxDatagramSize > 0 && m_dwMaxDatagramSize <= MAXIMUM_UDP_MAX_DATAGRAM_SIZE)	&&
		((int)m_dwPostReceiveCount > 0)															&&
		((int)m_dwDetectAttempts >= 0)															&&
		((int)m_dwDetectInterval >= 1000 || m_dwDetectInterval == 0)							)
		return TRUE;

	SetLastError(SE_INVALID_PARAM, __FUNCTION__, ERROR_INVALID_PARAMETER);
	return FALSE;
}

void CUdpServer::PrepareStart()
{
	m_bfActiveSockets.Reset(m_dwMaxConnectionCount);
	m_lsFreeSocket.Reset(m_dwFreeSocketObjPool);

	m_bfObjPool.SetItemCapacity(m_dwMaxDatagramSize);
	m_bfObjPool.SetPoolSize(m_dwFreeBufferObjPool);
	m_bfObjPool.SetPoolHold(m_dwFreeBufferObjHold);

	m_bfObjPool.Prepare();

	m_quSends	= make_unique<CSendQueue[]>(m_dwWorkerThreadCount);

	m_rcBuffers = make_unique<CBufferPtr[]>(m_dwWorkerThreadCount);
	for_each(m_rcBuffers.get(), m_rcBuffers.get() + m_dwWorkerThreadCount, [this](CBufferPtr& buff) {buff.Malloc(m_dwMaxDatagramSize);});

	m_soListens	= make_unique<SOCKET[]>(m_dwWorkerThreadCount);
	for_each(m_soListens.get(), m_soListens.get() + m_dwWorkerThreadCount, [](SOCKET& sock) {sock = INVALID_FD;});
}

BOOL CUdpServer::CheckStarting()
{
	CSpinLock locallock(m_csState);

	if(m_enState == SS_STOPPED)
		m_enState = SS_STARTING;
	else
	{
		SetLastError(SE_ILLEGAL_STATE, __FUNCTION__, ERROR_INVALID_STATE);
		return FALSE;
	}

	return TRUE;
}

BOOL CUdpServer::CheckStoping()
{
	if(m_enState != SS_STOPPED)
	{
		CSpinLock locallock(m_csState);

		if(HasStarted())
		{
			m_enState = SS_STOPPING;
			return TRUE;
		}
	}

	SetLastError(SE_ILLEGAL_STATE, __FUNCTION__, ERROR_INVALID_STATE);

	return FALSE;
}

BOOL CUdpServer::CreateListenSocket(LPCTSTR lpszBindAddress, USHORT usPort)
{
	if(::IsStrEmpty(lpszBindAddress))
		lpszBindAddress = DEFAULT_IPV4_BIND_ADDRESS;

	HP_SOCKADDR addr;

	if(!::sockaddr_A_2_IN(lpszBindAddress, usPort, addr))
	{
		SetLastError(SE_SOCKET_CREATE, __FUNCTION__, ::WSAGetLastError());
		return FALSE;
	}

	for(DWORD i = 0; i < m_dwWorkerThreadCount; i++)
	{
		m_soListens[i] = socket(addr.family, SOCK_DGRAM, IPPROTO_UDP);
		SOCKET soListen = m_soListens[i];

		if(IS_INVALID_FD(soListen))
		{
			SetLastError(SE_SOCKET_CREATE, __FUNCTION__, ::WSAGetLastError());
			return FALSE;
		}

		::fcntl_SETFL(soListen, O_NOATIME | O_NONBLOCK | O_CLOEXEC);
		VERIFY(IS_NO_ERROR(::SSO_ReuseAddress(soListen, m_enReusePolicy)));

		if(IS_HAS_ERROR(::bind(soListen, addr.Addr(), addr.AddrSize())))
		{
			SetLastError(SE_SOCKET_BIND, __FUNCTION__, ::WSAGetLastError());
			return FALSE;
		}

		if(TRIGGER(FirePrepareListen(soListen)) == HR_ERROR)
		{
			SetLastError(SE_SOCKET_PREPARE, __FUNCTION__, ENSURE_ERROR_CANCELLED);
			return FALSE;
		}
	}

	return TRUE;
}

BOOL CUdpServer::CreateWorkerThreads()
{
	return m_ioDispatcher.Start(this, m_dwPostReceiveCount, m_dwWorkerThreadCount);
}

BOOL CUdpServer::StartAccept()
{
	for(int i = 0; i < (int)m_dwWorkerThreadCount; i++)
	{
		SOCKET& soListen = m_soListens[i];

		if(!m_ioDispatcher.AddFD(i, soListen, EPOLLIN | EPOLLOUT | EPOLLET, TO_PVOID(&soListen)))
			return FALSE;
	}

	return TRUE;
}

BOOL CUdpServer::Stop()
{
	if(!CheckStoping())
		return FALSE;

	SendCloseNotify();

	CloseListenSocket();

	DisconnectClientSocket();
	WaitForClientSocketClose();

	WaitForWorkerThreadEnd();
	
	ReleaseClientSocket();

	FireShutdown();

	ReleaseFreeSocket();
	ClearSendQueues();

	Reset();

	return TRUE;
}

void CUdpServer::SendCloseNotify()
{
	if(!m_soListens)
		return;
	if(m_bfActiveSockets.Elements() == 0)
		return;

	TUdpSocketObjPtrPool::IndexSet indexes;
	m_bfActiveSockets.CopyIndexes(indexes);

	for(auto it = indexes.begin(), end = indexes.end(); it != end; ++it)
	{
		CONNID connID			 = *it;
		TUdpSocketObj* pSocketObj = FindSocketObj(connID);

		if(TUdpSocketObj::IsValid(pSocketObj))
			::SendUdpCloseNotify(m_soListens[pSocketObj->index], pSocketObj->remoteAddr);
	}

	::WaitFor(30);
}

void CUdpServer::CloseListenSocket()
{
	if(m_soListens)
	{
		for_each(m_soListens.get(), m_soListens.get() + m_dwWorkerThreadCount, [](SOCKET& sock)
		{
			if(sock != INVALID_FD)
			{
				::ManualCloseSocket(sock);
				sock = INVALID_FD;
			}
		});

		::WaitFor(70);
	}
}

void CUdpServer::DisconnectClientSocket()
{
	if(m_bfActiveSockets.Elements() == 0)
		return;

	TUdpSocketObjPtrPool::IndexSet indexes;
	m_bfActiveSockets.CopyIndexes(indexes);

	for(auto it = indexes.begin(), end = indexes.end(); it != end; ++it)
		Disconnect(*it);
}

void CUdpServer::WaitForClientSocketClose()
{
	while(m_bfActiveSockets.Elements() > 0)
		::WaitFor(50);
}

void CUdpServer::WaitForWorkerThreadEnd()
{
	m_ioDispatcher.Stop();
}

void CUdpServer::ReleaseClientSocket()
{
	VERIFY(m_bfActiveSockets.IsEmpty());
	m_bfActiveSockets.Reset();

	CWriteLock locallock(m_csClientSocket);
	m_mpClientAddr.clear();
}

void CUdpServer::ReleaseFreeSocket()
{
	m_lsFreeSocket.Clear();

	ReleaseGCSocketObj(TRUE);
	VERIFY(m_lsGCSocket.IsEmpty());
}

void CUdpServer::ClearSendQueues()
{
	if(m_quSends) for_each(m_quSends.get(), m_quSends.get() + m_dwWorkerThreadCount, [](CSendQueue& queue) {queue.UnsafeClear();});
}

void CUdpServer::Reset()
{
	m_phSocket.Reset();
	m_bfObjPool.Clear();

	m_soListens	= nullptr;
	m_rcBuffers	= nullptr;
	m_quSends	= nullptr;

	m_enState = SS_STOPPED;

	m_evWait.SyncNotifyAll();
}

TUdpSocketObj* CUdpServer::GetFreeSocketObj(CONNID dwConnID)
{
	DWORD dwIndex;
	TUdpSocketObj* pSocketObj = nullptr;

	if(m_lsFreeSocket.TryLock(&pSocketObj, dwIndex))
	{
		if(::GetTimeGap32(pSocketObj->freeTime) >= m_dwFreeSocketObjLockTime)
			VERIFY(m_lsFreeSocket.ReleaseLock(nullptr, dwIndex));
		else
		{
			VERIFY(m_lsFreeSocket.ReleaseLock(pSocketObj, dwIndex));
			pSocketObj = nullptr;
		}
	}

	if(!pSocketObj) pSocketObj = CreateSocketObj();
	pSocketObj->Reset(dwConnID);

	return pSocketObj;
}

TUdpSocketObj* CUdpServer::CreateSocketObj()
{
	return TUdpSocketObj::Construct(m_phSocket, m_bfObjPool);
}

void CUdpServer::DeleteSocketObj(TUdpSocketObj* pSocketObj)
{
	TUdpSocketObj::Destruct(pSocketObj);
}

void CUdpServer::AddFreeSocketObj(TUdpSocketObj* pSocketObj, EnSocketCloseFlag enFlag, EnSocketOperation enOperation, int iErrorCode, BOOL bNotify)
{
	if(!InvalidSocketObj(pSocketObj))
		return;

	CloseClientSocketObj(pSocketObj, enFlag, enOperation, iErrorCode, bNotify);

	{
		m_bfActiveSockets.Remove(pSocketObj->connID);

		CWriteLock locallock(m_csClientSocket);
		m_mpClientAddr.erase(&pSocketObj->remoteAddr);
	}

	m_ioDispatcher.DelTimer(pSocketObj->index, pSocketObj->fdTimer);
	TUdpSocketObj::Release(pSocketObj);

	ReleaseGCSocketObj();

	if(!m_lsFreeSocket.TryPut(pSocketObj))
		m_lsGCSocket.PushBack(pSocketObj);
}

void CUdpServer::ReleaseGCSocketObj(BOOL bForce)
{
	::ReleaseGCObj(m_lsGCSocket, m_dwFreeSocketObjLockTime, bForce);
}

BOOL CUdpServer::InvalidSocketObj(TUdpSocketObj* pSocketObj)
{
	return TUdpSocketObj::InvalidSocketObj(pSocketObj);
}

void CUdpServer::AddClientSocketObj(int idx, CONNID dwConnID, TUdpSocketObj* pSocketObj, const HP_SOCKADDR& remoteAddr)
{
	ASSERT(FindSocketObj(dwConnID) == nullptr);

	pSocketObj->index		= idx;
	pSocketObj->pHolder		= this;
	pSocketObj->connTime	= ::TimeGetTime();
	pSocketObj->activeTime	= pSocketObj->connTime;

	if(IsNeedDetectConnection())
		pSocketObj->fdTimer = m_ioDispatcher.AddTimer(pSocketObj->index, m_dwDetectInterval, pSocketObj);

	remoteAddr.Copy(pSocketObj->remoteAddr);
	pSocketObj->SetConnected();

	VERIFY(m_bfActiveSockets.ReleaseLock(dwConnID, pSocketObj));

	CWriteLock locallock(m_csClientSocket);
	m_mpClientAddr[&pSocketObj->remoteAddr]	= dwConnID;
}

TUdpSocketObj* CUdpServer::FindSocketObj(CONNID dwConnID)
{
	TUdpSocketObj* pSocketObj = nullptr;

	if(m_bfActiveSockets.Get(dwConnID, &pSocketObj) != TUdpSocketObjPtrPool::GR_VALID)
		pSocketObj = nullptr;

	return pSocketObj;
}

CONNID CUdpServer::FindConnectionID(const HP_SOCKADDR* pAddr)
{
	CONNID dwConnID = 0;

	CReadLock locallock(m_csClientSocket);

	TSockAddrMapCI it = m_mpClientAddr.find(pAddr);
	if(it != m_mpClientAddr.end())
		dwConnID = it->second;

	return dwConnID;
}

void CUdpServer::CloseClientSocketObj(TUdpSocketObj* pSocketObj, EnSocketCloseFlag enFlag, EnSocketOperation enOperation, int iErrorCode, BOOL bNotify)
{
	ASSERT(TUdpSocketObj::IsExist(pSocketObj));

	SOCKET soListen = m_soListens[pSocketObj->index];

	if(bNotify && soListen != INVALID_SOCKET)
		::SendUdpCloseNotify(soListen, pSocketObj->remoteAddr);

	if(enFlag == SCF_CLOSE)
		FireClose(pSocketObj, SO_CLOSE, SE_OK);
	else if(enFlag == SCF_ERROR)
		FireClose(pSocketObj, enOperation, iErrorCode);
}

BOOL CUdpServer::GetListenAddress(TCHAR lpszAddress[], int& iAddressLen, USHORT& usPort)
{
	ASSERT(lpszAddress != nullptr && iAddressLen > 0);

	if(!HasStarted())
	{
		::SetLastError(ERROR_INVALID_STATE);
		return FALSE;
	}

	return ::GetSocketLocalAddress(m_soListens[0], lpszAddress, iAddressLen, usPort);
}

BOOL CUdpServer::GetLocalAddress(CONNID dwConnID, TCHAR lpszAddress[], int& iAddressLen, USHORT& usPort)
{
	ASSERT(lpszAddress != nullptr && iAddressLen > 0);

	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);

	if(!TUdpSocketObj::IsValid(pSocketObj))
	{
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
		return FALSE;
	}

	return ::GetSocketLocalAddress(m_soListens[pSocketObj->index], lpszAddress, iAddressLen, usPort);
}

BOOL CUdpServer::GetRemoteAddress(CONNID dwConnID, TCHAR lpszAddress[], int& iAddressLen, USHORT& usPort)
{
	ASSERT(lpszAddress != nullptr && iAddressLen > 0);

	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);

	if(!TUdpSocketObj::IsExist(pSocketObj))
	{
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
		return FALSE;
	}

	ADDRESS_FAMILY usFamily;
	return ::sockaddr_IN_2_A(pSocketObj->remoteAddr, usFamily, lpszAddress, iAddressLen, usPort);
}

BOOL CUdpServer::SetConnectionExtra(CONNID dwConnID, PVOID pExtra)
{
	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);
	return SetConnectionExtra(pSocketObj, pExtra);
}

BOOL CUdpServer::SetConnectionExtra(TUdpSocketObj* pSocketObj, PVOID pExtra)
{
	if(!TUdpSocketObj::IsExist(pSocketObj))
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
	else
	{
		pSocketObj->extra = pExtra;
		return TRUE;
	}

	return FALSE;
}

BOOL CUdpServer::GetConnectionExtra(CONNID dwConnID, PVOID* ppExtra)
{
	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);
	return GetConnectionExtra(pSocketObj, ppExtra);
}

BOOL CUdpServer::GetConnectionExtra(TUdpSocketObj* pSocketObj, PVOID* ppExtra)
{
	ASSERT(ppExtra != nullptr);

	if(!TUdpSocketObj::IsExist(pSocketObj))
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
	else
	{
		*ppExtra = pSocketObj->extra;
		return TRUE;
	}

	return FALSE;
}

BOOL CUdpServer::SetConnectionReserved(CONNID dwConnID, PVOID pReserved)
{
	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);
	return SetConnectionReserved(pSocketObj, pReserved);
}

BOOL CUdpServer::SetConnectionReserved(TUdpSocketObj* pSocketObj, PVOID pReserved)
{
	if(!TUdpSocketObj::IsExist(pSocketObj))
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
	else
	{
		pSocketObj->reserved = pReserved;
		return TRUE;
	}

	return FALSE;
}

BOOL CUdpServer::GetConnectionReserved(CONNID dwConnID, PVOID* ppReserved)
{
	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);
	return GetConnectionReserved(pSocketObj, ppReserved);
}

BOOL CUdpServer::GetConnectionReserved(TUdpSocketObj* pSocketObj, PVOID* ppReserved)
{
	ASSERT(ppReserved != nullptr);

	if(!TUdpSocketObj::IsExist(pSocketObj))
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
	else
	{
		*ppReserved = pSocketObj->reserved;
		return TRUE;
	}

	return FALSE;
}

BOOL CUdpServer::SetConnectionReserved2(CONNID dwConnID, PVOID pReserved2)
{
	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);
	return SetConnectionReserved2(pSocketObj, pReserved2);
}

BOOL CUdpServer::SetConnectionReserved2(TUdpSocketObj* pSocketObj, PVOID pReserved2)
{
	if(!TUdpSocketObj::IsExist(pSocketObj))
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
	else
	{
		pSocketObj->reserved2 = pReserved2;
		return TRUE;
	}

	return FALSE;
}

BOOL CUdpServer::GetConnectionReserved2(CONNID dwConnID, PVOID* ppReserved2)
{
	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);
	return GetConnectionReserved2(pSocketObj, ppReserved2);
}

BOOL CUdpServer::GetConnectionReserved2(TUdpSocketObj* pSocketObj, PVOID* ppReserved2)
{
	ASSERT(ppReserved2 != nullptr);

	if(!TUdpSocketObj::IsExist(pSocketObj))
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
	else
	{
		*ppReserved2 = pSocketObj->reserved2;
		return TRUE;
	}

	return FALSE;
}

BOOL CUdpServer::IsPauseReceive(CONNID dwConnID, BOOL& bPaused)
{
	::SetLastError(ERROR_CALL_NOT_IMPLEMENTED);

	bPaused = FALSE;

	return FALSE;
}

BOOL CUdpServer::IsConnected(CONNID dwConnID)
{
	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);

	if(!TUdpSocketObj::IsValid(pSocketObj))
	{
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
		return FALSE;
	}

	return pSocketObj->HasConnected();
}

BOOL CUdpServer::GetPendingDataLength(CONNID dwConnID, int& iPending)
{
	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);

	if(!TUdpSocketObj::IsValid(pSocketObj))
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
	else
	{
		iPending = pSocketObj->Pending();
		return TRUE;
	}

	return FALSE;
}

DWORD CUdpServer::GetConnectionCount()
{
	return m_bfActiveSockets.Elements();
}

BOOL CUdpServer::GetAllConnectionIDs(CONNID pIDs[], DWORD& dwCount)
{
	return m_bfActiveSockets.GetAllElementIndexes(pIDs, dwCount);
}

BOOL CUdpServer::GetConnectPeriod(CONNID dwConnID, DWORD& dwPeriod)
{
	BOOL isOK					= TRUE;
	TUdpSocketObj* pSocketObj	= FindSocketObj(dwConnID);

	if(TUdpSocketObj::IsValid(pSocketObj))
		dwPeriod = ::GetTimeGap32(pSocketObj->connTime);
	else
	{
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
		isOK = FALSE;
	}

	return isOK;
}

BOOL CUdpServer::GetSilencePeriod(CONNID dwConnID, DWORD& dwPeriod)
{
	if(!m_bMarkSilence)
		return FALSE;

	BOOL isOK					= TRUE;
	TUdpSocketObj* pSocketObj	= FindSocketObj(dwConnID);

	if(TUdpSocketObj::IsValid(pSocketObj))
		dwPeriod = ::GetTimeGap32(pSocketObj->activeTime);
	else
	{
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
		isOK = FALSE;
	}

	return isOK;
}

BOOL CUdpServer::Disconnect(CONNID dwConnID, BOOL bForce)
{
	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);

	if(!TUdpSocketObj::IsValid(pSocketObj))
	{
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
		return FALSE;
	}

	return m_ioDispatcher.SendCommandByIndex(pSocketObj->index, DISP_CMD_DISCONNECT, dwConnID, bForce);
}

BOOL CUdpServer::DisconnectLongConnections(DWORD dwPeriod, BOOL bForce)
{
	if(dwPeriod > MAX_CONNECTION_PERIOD)
		return FALSE;
	if(m_bfActiveSockets.Elements() == 0)
		return TRUE;

	DWORD now = ::TimeGetTime();

	TUdpSocketObjPtrPool::IndexSet indexes;
	m_bfActiveSockets.CopyIndexes(indexes);

	for(auto it = indexes.begin(), end = indexes.end(); it != end; ++it)
	{
		CONNID connID				= *it;
		TUdpSocketObj* pSocketObj	= FindSocketObj(connID);

		if(TUdpSocketObj::IsValid(pSocketObj) && (int)(now - pSocketObj->connTime) >= (int)dwPeriod)
			Disconnect(connID, bForce);
	}

	return TRUE;
}

BOOL CUdpServer::DisconnectSilenceConnections(DWORD dwPeriod, BOOL bForce)
{
	if(!m_bMarkSilence)
		return FALSE;
	if(dwPeriod > MAX_CONNECTION_PERIOD)
		return FALSE;
	if(m_bfActiveSockets.Elements() == 0)
		return TRUE;

	DWORD now = ::TimeGetTime();

	TUdpSocketObjPtrPool::IndexSet indexes;
	m_bfActiveSockets.CopyIndexes(indexes);

	for(auto it = indexes.begin(), end = indexes.end(); it != end; ++it)
	{
		CONNID connID				= *it;
		TUdpSocketObj* pSocketObj	= FindSocketObj(connID);

		if(TUdpSocketObj::IsValid(pSocketObj) && (int)(now - pSocketObj->activeTime) >= (int)dwPeriod)
			Disconnect(connID, bForce);
	}

	return TRUE;
}

BOOL CUdpServer::PauseReceive(CONNID dwConnID, BOOL bPause)
{
	::SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
	return FALSE;
}

BOOL CUdpServer::OnBeforeProcessIo(const TDispContext* pContext, PVOID pv, UINT events)
{
	if(pv == &m_soListens[pContext->GetIndex()])
		return TRUE;

	if(!(events & _EPOLL_ALL_ERROR_EVENTS))
		DetectConnection(pv);

	return FALSE;
}

VOID CUdpServer::OnAfterProcessIo(const TDispContext* pContext, PVOID pv, UINT events, BOOL rs)
{

}

VOID CUdpServer::OnCommand(const TDispContext* pContext, TDispCommand* pCmd)
{
	CONNID dwConnID = (CONNID)(pCmd->wParam);

	switch(pCmd->type)
	{
	case DISP_CMD_SEND:
		HandleCmdSend(dwConnID, (int)(pCmd->lParam));
		break;
	case DISP_CMD_DISCONNECT:
		HandleCmdDisconnect(dwConnID, (BOOL)pCmd->lParam);
		break;
	case DISP_CMD_TIMEOUT:
		HandleCmdTimeout(dwConnID);
		break;
	}
}

VOID CUdpServer::HandleCmdDisconnect(CONNID dwConnID, BOOL bForce)
{
	AddFreeSocketObj(FindSocketObj(dwConnID), SCF_CLOSE);
}

VOID CUdpServer::HandleCmdTimeout(CONNID dwConnID)
{
	AddFreeSocketObj(FindSocketObj(dwConnID), SCF_CLOSE, SO_UNKNOWN, 0, FALSE);
}

BOOL CUdpServer::OnReadyRead(const TDispContext* pContext, PVOID pv, UINT events)
{
	return HandleReceive(pContext, RETRIVE_EVENT_FLAG_H(events));
}

BOOL CUdpServer::OnReadyWrite(const TDispContext* pContext, PVOID pv, UINT events)
{
	return HandleSend(pContext, RETRIVE_EVENT_FLAG_H(events));
}

BOOL CUdpServer::OnHungUp(const TDispContext* pContext, PVOID pv, UINT events)
{
	return HandleClose(nullptr, SO_CLOSE, 0);
}

BOOL CUdpServer::OnError(const TDispContext* pContext, PVOID pv, UINT events)
{
	return HandleClose(nullptr, SO_CLOSE, -1);
}

VOID CUdpServer::OnDispatchThreadStart(THR_ID tid)
{
	OnWorkerThreadStart(tid);
}

VOID CUdpServer::OnDispatchThreadEnd(THR_ID tid)
{
	OnWorkerThreadEnd(tid);
}

BOOL CUdpServer::HandleClose(TUdpSocketObj* pSocketObj, EnSocketOperation enOperation, int iErrorCode)
{
	if(!HasStarted())
		return FALSE;
	else if(pSocketObj == nullptr)
	{
		TRACE("HandleClose() -> OP: %d, EC: %d", enOperation, iErrorCode);
		return TRUE;
	}

	if(iErrorCode == -1)
		iErrorCode = ::SSO_GetError(m_soListens[pSocketObj->index]);

	EnSocketCloseFlag enFlag = IS_NO_ERROR(iErrorCode) ? SCF_CLOSE : SCF_ERROR;

	AddFreeSocketObj(pSocketObj, enFlag, enOperation, iErrorCode);

	return FALSE;
}

BOOL CUdpServer::HandleReceive(const TDispContext* pContext, int flag)
{
	int idx				= pContext->GetIndex();
	CBufferPtr& buffer	= m_rcBuffers[idx];
	int iBufferLen		= (int)buffer.Size();

	while(TRUE)
	{
		HP_SOCKADDR addr;
		socklen_t dwAddrLen = (socklen_t)addr.AddrSize();

		int rc = (int)recvfrom(m_soListens[idx], buffer.Ptr(), iBufferLen, MSG_TRUNC, addr.Addr(), &dwAddrLen);

		if(rc >= 0)
		{
			CONNID dwConnID = FindConnectionID(&addr);

			if(dwConnID == 0)
			{
				if(rc > iBufferLen)
					continue;

				if((dwConnID = HandleAccept(pContext, addr)) == 0)
					continue;
			}

			TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);
			ASSERT(pSocketObj->index == idx);

			if(!TUdpSocketObj::IsValid(pSocketObj))
				continue;

			if(rc == 0)
			{
				HandleZeroBytes(pSocketObj);
				continue;
			}

			if(rc > iBufferLen)
			{
				AddFreeSocketObj(pSocketObj, SCF_ERROR, SO_RECEIVE, ERROR_BAD_LENGTH);
				continue;
			}

			if(::IsUdpCloseNotify(buffer.Ptr(), rc))
			{
				AddFreeSocketObj(pSocketObj, SCF_CLOSE, SO_CLOSE, SE_OK, FALSE);
				continue;
			}

			if(TRIGGER(FireReceive(pSocketObj, buffer.Ptr(), rc)) == HR_ERROR)
			{
				TRACE("<S-CNNID: %zu> OnReceive() event return 'HR_ERROR', connection will be closed !", dwConnID);

				AddFreeSocketObj(pSocketObj, SCF_ERROR, SO_RECEIVE, ENSURE_ERROR_CANCELLED);;
				continue;
			}
		}
		else if(rc == SOCKET_ERROR)
		{
			int code = ::WSAGetLastError();

			if(code == ERROR_WOULDBLOCK)
				break;
			else if(!HandleClose(nullptr, SO_RECEIVE, code))
				return FALSE;
		}
		else
		{
			ASSERT(FALSE);
		}
	}

	return TRUE;
}

CONNID CUdpServer::HandleAccept(const TDispContext* pContext, HP_SOCKADDR& addr)
{
	int idx						= pContext->GetIndex();
	CONNID dwConnID				= 0;
	TUdpSocketObj* pSocketObj	= nullptr;

	if(!m_bfActiveSockets.AcquireLock(dwConnID))
	{
		::SendUdpCloseNotify(m_soListens[idx], addr);
		return 0;
	}

	pSocketObj = GetFreeSocketObj(dwConnID);
	AddClientSocketObj(idx, dwConnID, pSocketObj, addr);

	if(TriggerFireAccept(pSocketObj) == HR_ERROR)
	{
		AddFreeSocketObj(pSocketObj);
		dwConnID = 0;
	}

	return dwConnID;
}

void CUdpServer::HandleZeroBytes(TUdpSocketObj* pSocketObj)
{
	TRACE("<S-CNNID: %zu> recv 0 bytes (detect package)", pSocketObj->connID);

	pSocketObj->detectFails = 0;

#if defined(DEBUG_TRACE)
	int rc = (int)
#endif
	sendto(m_soListens[pSocketObj->index], nullptr, 0, 0, pSocketObj->remoteAddr.Addr(), pSocketObj->remoteAddr.AddrSize());

	TRACE("<S-CNNID: %zu> send 0 bytes (detect ack package - %s)", pSocketObj->connID, IS_HAS_ERROR(rc) ? "fail" : "succ");
}

BOOL CUdpServer::HandleSend(const TDispContext* pContext, int flag)
{
	CSendQueue& quSend	= m_quSends[pContext->GetIndex()];
	CONNID dwConnID		= 0;

	while(quSend.PopFront(&dwConnID))
		HandleCmdSend(dwConnID, flag);

	return TRUE;
}

VOID CUdpServer::HandleCmdSend(CONNID dwConnID, int flag)
{
	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);

	if(!TUdpSocketObj::IsValid(pSocketObj) || !pSocketObj->IsPending())
		return;

	BOOL bBlocked	= FALSE;
	int writes		= flag ? -1 : MAX_CONTINUE_WRITES;

	TBufferObjList& sndBuff = pSocketObj->sndBuff;
	TItemPtr itPtr(sndBuff);

	for(int i = 0; i < writes || writes < 0; i++)
	{
		{
			CReentrantCriSecLock locallock(pSocketObj->csSend);
			itPtr = sndBuff.PopFront();
		}

		if(!itPtr.IsValid())
			break;

		ASSERT(!itPtr->IsEmpty());

		if(!SendItem(pSocketObj, itPtr, bBlocked))
			return;

		if(bBlocked)
		{
			{
				CReentrantCriSecLock locallock(pSocketObj->csSend);
				sndBuff.PushFront(itPtr.Detach());
			}

			m_quSends[pSocketObj->index].PushBack(dwConnID);

			break;
		}
	}

	if(!bBlocked && pSocketObj->IsPending())
		VERIFY(m_ioDispatcher.SendCommandByIndex(pSocketObj->index, DISP_CMD_SEND, dwConnID));
}

BOOL CUdpServer::SendItem(TUdpSocketObj* pSocketObj, TItem* pItem, BOOL& bBlocked)
{
	int rc = (int)sendto(m_soListens[pSocketObj->index], pItem->Ptr(), pItem->Size(), 0, pSocketObj->remoteAddr.Addr(), pSocketObj->remoteAddr.AddrSize());

	if(rc > 0)
	{
		ASSERT(rc == pItem->Size());

		if(TRIGGER(FireSend(pSocketObj, pItem->Ptr(), rc)) == HR_ERROR)
		{
			TRACE("<S-CNNID: %zu> OnSend() event should not return 'HR_ERROR' !!", pSocketObj->connID);
			ASSERT(FALSE);
		}
	}
	else if(rc == SOCKET_ERROR)
	{
		int code = ::WSAGetLastError();

		if(code == ERROR_WOULDBLOCK)
			bBlocked = TRUE;
		else if(!HandleClose(pSocketObj, SO_SEND, code))
			return FALSE;
	}
	else
		ASSERT(FALSE);

	return TRUE;
}

BOOL CUdpServer::Send(CONNID dwConnID, const BYTE* pBuffer, int iLength, int iOffset)
{
	ASSERT(pBuffer && iLength > 0 && iLength <= (int)m_dwMaxDatagramSize);

	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);

	return DoSend(pSocketObj, pBuffer, iLength, iOffset);
}

BOOL CUdpServer::DoSend(TUdpSocketObj* pSocketObj, const BYTE* pBuffer, int iLength, int iOffset)
{
	int result = NO_ERROR;

	if(TUdpSocketObj::IsValid(pSocketObj))
	{
		if(pBuffer && iLength > 0 && iLength <= (int)m_dwMaxDatagramSize)
		{
			if(iOffset != 0) pBuffer += iOffset;

			TItemPtr itPtr(m_bfObjPool, m_bfObjPool.PickFreeItem());
			itPtr->Cat(pBuffer, iLength);

			result = SendInternal(pSocketObj, itPtr);
		}
		else
			result = ERROR_INVALID_PARAMETER;
	}
	else
		result = ERROR_OBJECT_NOT_FOUND;

	if(result != NO_ERROR)
		::SetLastError(result);

	return (result == NO_ERROR);
}

BOOL CUdpServer::SendPackets(CONNID dwConnID, const WSABUF pBuffers[], int iCount)
{
	ASSERT(pBuffers && iCount > 0);

	if(!pBuffers || iCount <= 0)
		return ERROR_INVALID_PARAMETER;

	TUdpSocketObj* pSocketObj = FindSocketObj(dwConnID);

	if(!TUdpSocketObj::IsValid(pSocketObj))
	{
		::SetLastError(ERROR_OBJECT_NOT_FOUND);
		return FALSE;
	}

	int result	= NO_ERROR;
	int iLength = 0;
	int iMaxLen = (int)m_dwMaxDatagramSize;
	
	TItemPtr itPtr(m_bfObjPool, m_bfObjPool.PickFreeItem());

	for(int i = 0; i < iCount; i++)
	{
		int iBufLen = pBuffers[i].len;

		if(iBufLen > 0)
		{
			BYTE* pBuffer = (BYTE*)pBuffers[i].buf;
			ASSERT(pBuffer);

			iLength += iBufLen;

			if(iLength <= iMaxLen)
				itPtr->Cat(pBuffer, iBufLen);
			else
				break;
		}
	}

	if(iLength > 0 && iLength <= iMaxLen)
		result = SendInternal(pSocketObj, itPtr);
	else
		result = ERROR_INCORRECT_SIZE;

	if(result != NO_ERROR)
		::SetLastError(result);

	return (result == NO_ERROR);

}

int CUdpServer::SendInternal(TUdpSocketObj* pSocketObj, TItemPtr& itPtr)
{
	BOOL bPending;

	{
		CLocalSafeCounter localcounter(*pSocketObj);
		CReentrantCriSecLock locallock(pSocketObj->csSend);

		if(!TUdpSocketObj::IsValid(pSocketObj))
			return ERROR_OBJECT_NOT_FOUND;

		bPending = pSocketObj->IsPending();

		pSocketObj->sndBuff.PushBack(itPtr.Detach());
		ASSERT(pSocketObj->sndBuff.Length() > 0);
	}

	if(!bPending && pSocketObj->IsPending())
		VERIFY(m_ioDispatcher.SendCommandByIndex(pSocketObj->index, DISP_CMD_SEND, pSocketObj->connID));

	return NO_ERROR;
}

void CUdpServer::DetectConnection(PVOID pv)
{
	TUdpSocketObj* pSocketObj = (TUdpSocketObj*)pv;

	if(TUdpSocketObj::IsValid(pSocketObj))
	{
		CUdpServer* pServer = (CUdpServer*)pSocketObj->pHolder;

		if(pSocketObj->detectFails >= pServer->m_dwDetectAttempts)
			VERIFY(m_ioDispatcher.SendCommandByIndex(pSocketObj->index, DISP_CMD_TIMEOUT, pSocketObj->connID));
		else
			::InterlockedIncrement(&pSocketObj->detectFails);

		::ReadTimer(pSocketObj->fdTimer);
	}
}

#endif