BCIgui/Masterarbeit/openvibe/extras-master/applications/examples/external-stimulation-connection/include/openvibeStimulationConnection.h

#pragma once

#include <sys/timeb.h>
#include <boost/interprocess/ipc/message_queue.hpp>

#include <iostream> // log
#include <utility>

namespace OpenViBE {
class CStimulationConnection
{
public:
	/**
	 * Create a new OpenvibeStimulationConnection object.
	 *
	 * Initiates the message queue.
	 *
	 * @param queueName The name of the queue.
	 * @throw boost::interprocess::interprocess_exception Throws an
	 * interprocess exception in the queue fails to be created.
	 */
	explicit CStimulationConnection(std::string queueName = "openvibeExternalStimulations")
		: m_messageQueueName(std::move(queueName))
	{
		boost::interprocess::message_queue::remove(m_messageQueueName.c_str());

		try
		{
			m_messageQueue = new boost::interprocess::message_queue(boost::interprocess::create_only, m_messageQueueName.c_str(), m_maxMessages,
																	m_chunkLength * sizeof(uint64_t));
		}
		catch (boost::interprocess::interprocess_exception& exception)
		{
			std::cout << exception.what() << std::endl; // log
			throw;
		}
	}

	/**
	 * Send a stimulation to the OpenViBE Acquisition server on the initiated
	 * queue.
	 *
	 * @throw boost::interprocess::interprocess_exception Throws an exception
	 * if the message sending failed.
	 */
	void sendStimulation(const uint64_t stimulationID) const
	{
		struct timeb currentTime;

		ftime(&currentTime);

		const uint64_t stimulationTime = currentTime.time * 1000 + currentTime.millitm;
		uint64_t message[3];

		message[0] = 0; // unused at the moment
		message[1] = stimulationID;
		message[2] = stimulationTime;

		try { m_messageQueue->send(&message, sizeof(message), 0); }
		catch (boost::interprocess::interprocess_exception& exception)
		{
			std::cout << exception.what() << std::endl; // log
			throw;
		}
	}

protected:
	std::string m_messageQueueName;
	int m_chunkLength = 3;
	int m_maxMessages = 5000;

	// openvibe currently uses messages of length of 3
	boost::interprocess::message_queue* m_messageQueue = nullptr;
};
}	// namespace OpenViBE