Bachelorarbeit/AsioNetClientServer/src/net_dequeue_ts.h

/*
MMO Client/Server Framework using ASIO
"Happy Birthday Mrs Javidx9!" - javidx9

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Part #1: https://youtu.be/2hNdkYInj4g
Part #2: https://youtu.be/UbjxGvrDrbw

License (OLC-3)
~~~~~~~~~~~~~~~

Copyright 2018 - 2020 OneLoneCoder.com

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions or derivations of source code must retain the above
copyright notice, this list of conditions and the following disclaimer.

2. Redistributions or derivative works in binary form must reproduce
the above copyright notice. This list of conditions and the following
disclaimer must be reproduced in the documentation and/or other
materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Links
~~~~~
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Author
~~~~~~
David Barr, aka javidx9, ©OneLoneCoder 2019, 2020

*/

#pragma once

#include "net_common.h"


namespace net
{
	template<typename T>
    class ts_dequeue
	{
	public:
        ts_dequeue() = default;
        ts_dequeue(const ts_dequeue<T>&) = delete;
        virtual ~ts_dequeue() { clear(); }

	public:
		// Returns and maintains item at front of Queue
		const T& front()
		{
			std::scoped_lock lock(muxQueue);
			return deqQueue.front();
		}

		// Returns and maintains item at back of Queue
		const T& back()
		{
			std::scoped_lock lock(muxQueue);
			return deqQueue.back();
		}

		// Removes and returns item from front of Queue
		T pop_front()
		{
			std::scoped_lock lock(muxQueue);
			auto t = std::move(deqQueue.front());
			deqQueue.pop_front();
			return t;
		}

		// Removes and returns item from back of Queue
		T pop_back()
		{
			std::scoped_lock lock(muxQueue);
			auto t = std::move(deqQueue.back());
			deqQueue.pop_back();
			return t;
		}

		// Adds an item to back of Queue
		void push_back(const T& item)
		{
			std::scoped_lock lock(muxQueue);
			deqQueue.emplace_back(std::move(item));

			std::unique_lock<std::mutex> ul(muxBlocking);
			cvBlocking.notify_one();
		}

		// Adds an item to front of Queue
		void push_front(const T& item)
		{
			std::scoped_lock lock(muxQueue);
			deqQueue.emplace_front(std::move(item));

			std::unique_lock<std::mutex> ul(muxBlocking);
			cvBlocking.notify_one();
		}

		// Returns true if Queue has no items
		bool empty()
		{
			std::scoped_lock lock(muxQueue);
			return deqQueue.empty();
		}

		// Returns number of items in Queue
		size_t count()
		{
			std::scoped_lock lock(muxQueue);
			return deqQueue.size();
		}

		// Clears Queue
		void clear()
		{
			std::scoped_lock lock(muxQueue);
			deqQueue.clear();
		}

		void wait()
		{
			while (empty())
			{
				std::unique_lock<std::mutex> ul(muxBlocking);
				cvBlocking.wait(ul);
			}
		}

	protected:
		std::mutex muxQueue;
		std::deque<T> deqQueue;
		std::condition_variable cvBlocking;
		std::mutex muxBlocking;
	};
}