C++ WaitObjectContainer类代码示例

void WindowsPipeSender::GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack)
{
	if (m_resultPending)
		container.AddHandle(m_event, CallStack("WindowsPipeSender::GetWaitObjects() - result pending", &callStack));
	else
		container.SetNoWait(CallStack("WindowsPipeSender::GetWaitObjects() - result ready", &callStack));
}

void SocketReceiver::GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack)
{
	if (m_resultPending)
		container.AddHandle(m_event, CallStack("SocketReceiver::GetWaitObjects() - result pending", &callStack));
	else if (!m_eofReceived)
		container.SetNoWait(CallStack("SocketReceiver::GetWaitObjects() - result ready", &callStack));
}

lword NonblockingSink::TimedFlush(unsigned long maxTime, size_t targetSize)
{
	m_blockedBySpeedLimit = false;

	size_t curBufSize = GetCurrentBufferSize();
	if (curBufSize <= targetSize && (targetSize || !EofPending()))
		return 0;

	if (!GetMaxBytesPerSecond())
		return DoFlush(maxTime, targetSize);

	bool forever = (maxTime == INFINITE_TIME);
	unsigned long timeToGo = maxTime;
	Timer timer(Timer::MILLISECONDS, forever);
	lword totalFlushed = 0;

	timer.StartTimer();

	while (true)
	{	
		size_t flushSize = UnsignedMin(curBufSize - targetSize, ComputeCurrentTransceiveLimit());
		if (flushSize || EofPending())
		{
			if (!forever) timeToGo = SaturatingSubtract(maxTime, timer.ElapsedTime());
			size_t ret = (size_t)DoFlush(timeToGo, curBufSize - flushSize);
			if (ret)
			{
				NoteTransceive(ret);
				curBufSize -= ret;
				totalFlushed += ret;
			}
		}

		if (curBufSize <= targetSize && (targetSize || !EofPending()))
			break;

		if (!forever)
		{
			timeToGo = SaturatingSubtract(maxTime, timer.ElapsedTime());
			if (!timeToGo)
				break;
		}

		double waitTime = TimeToNextTransceive();
		if (!forever && waitTime > timeToGo)
		{
			m_blockedBySpeedLimit = true;
			break;
		}

		WaitObjectContainer container;
		LimitedBandwidth::GetWaitObjects(container, CallStack("NonblockingSink::TimedFlush() - speed limit", 0));
		container.Wait((unsigned long)waitTime);
	}

	return totalFlushed;
}

void NetworkSource::GetWaitObjects(WaitObjectContainer &container, CallStack const& callStack)
{
	if (BlockedBySpeedLimit())
		LimitedBandwidth::GetWaitObjects(container, CallStack("NetworkSource::GetWaitObjects() - speed limit", &callStack));
	else if (!m_outputBlocked)
	{
		if (m_dataBegin == m_dataEnd)
			AccessReceiver().GetWaitObjects(container, CallStack("NetworkSource::GetWaitObjects() - no data", &callStack)); 
		else
			container.SetNoWait(CallStack("NetworkSource::GetWaitObjects() - have data", &callStack));
	}

	AttachedTransformation()->GetWaitObjects(container, CallStack("NetworkSource::GetWaitObjects() - attachment", &callStack));
}

bool Waitable::Wait(unsigned long milliseconds)
{
	WaitObjectContainer container;
	GetWaitObjects(container);
	return container.Wait(milliseconds);
}

size_t NonblockingSource::GeneralPump2(
	lword& byteCount, bool blockingOutput,
	unsigned long maxTime, bool checkDelimiter, byte delimiter)
{
	m_blockedBySpeedLimit = false;

	if (!GetMaxBytesPerSecond())
	{
		size_t ret = DoPump(byteCount, blockingOutput, maxTime, checkDelimiter, delimiter);
		m_doPumpBlocked = (ret != 0);
		return ret;
	}

	bool forever = (maxTime == INFINITE_TIME);
	unsigned long timeToGo = maxTime;
	Timer timer(Timer::MILLISECONDS, forever);
	lword maxSize = byteCount;
	byteCount = 0;

	timer.StartTimer();

	while (true)
	{
		lword curMaxSize = UnsignedMin(ComputeCurrentTransceiveLimit(), maxSize - byteCount);

		if (curMaxSize || m_doPumpBlocked)
		{
			if (!forever) timeToGo = SaturatingSubtract(maxTime, timer.ElapsedTime());
			size_t ret = DoPump(curMaxSize, blockingOutput, timeToGo, checkDelimiter, delimiter);
			m_doPumpBlocked = (ret != 0);
			if (curMaxSize)
			{
				NoteTransceive(curMaxSize);
				byteCount += curMaxSize;
			}
			if (ret)
				return ret;
		}

		if (maxSize != ULONG_MAX && byteCount >= maxSize)
			break;

		if (!forever)
		{
			timeToGo = SaturatingSubtract(maxTime, timer.ElapsedTime());
			if (!timeToGo)
				break;
		}

		double waitTime = TimeToNextTransceive();
		if (!forever && waitTime > timeToGo)
		{
			m_blockedBySpeedLimit = true;
			break;
		}

		WaitObjectContainer container;
		LimitedBandwidth::GetWaitObjects(container, CallStack("NonblockingSource::GeneralPump2() - speed limit", 0));
		container.Wait((unsigned long)waitTime);
	}

	return 0;
}

bool Waitable::Wait(unsigned long milliseconds, CallStack const& callStack)
{
	WaitObjectContainer container;
	GetWaitObjects(container, callStack);	// reduce clutter by not adding this func to stack
	return container.Wait(milliseconds);
}

void ForwardTcpPort(const char *sourcePortName, const char *destinationHost, const char *destinationPortName)
{
#ifdef SOCKETS_AVAILABLE
	SocketsInitializer sockInit;

	Socket sockListen, sockSource, sockDestination;

	int sourcePort = Socket::PortNameToNumber(sourcePortName);
	int destinationPort = Socket::PortNameToNumber(destinationPortName);

	sockListen.Create();
	sockListen.Bind(sourcePort);

	cout << "Listing on port " << sourcePort << ".\n";
	sockListen.Listen();

	sockListen.Accept(sockSource);
	cout << "Connection accepted on port " << sourcePort << ".\n";
	sockListen.CloseSocket();

	cout << "Making connection to " << destinationHost << ", port " << destinationPort << ".\n";
	sockDestination.Create();
	sockDestination.Connect(destinationHost, destinationPort);

	cout << "Connection made to " << destinationHost << ", starting to forward.\n";

	SocketSource out(sockSource, false, new SocketSink(sockDestination));
	SocketSource in(sockDestination, false, new SocketSink(sockSource));

	WaitObjectContainer waitObjects;

	while (!(in.SourceExhausted() && out.SourceExhausted()))
	{
		waitObjects.Clear();

		out.GetWaitObjects(waitObjects);
		in.GetWaitObjects(waitObjects);

		waitObjects.Wait(INFINITE_TIME);

		if (!out.SourceExhausted())
		{
			cout << "o" << flush;
			out.PumpAll2(false);
			if (out.SourceExhausted())
				cout << "EOF received on source socket.\n";
		}

		if (!in.SourceExhausted())
		{
			cout << "i" << flush;
			in.PumpAll2(false);
			if (in.SourceExhausted())
				cout << "EOF received on destination socket.\n";
		}
	}
#else
	cout << "Socket support was not enabled at compile time.\n";
	exit(-1);
#endif
}