libreoffice-online/loolwsd/MessageQueue.hpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef INCLUDED_MESSAGEQUEUE_HPP
#define INCLUDED_MESSAGEQUEUE_HPP
#include <condition_variable>
#include <mutex>
#include <deque>
#include <vector>
/** Thread-safe message queue (FIFO).
*/
class MessageQueue
{
public:
typedef std::vector<char> Payload;
MessageQueue()
{
}
virtual ~MessageQueue();
MessageQueue(const MessageQueue&) = delete;
MessageQueue& operator=(const MessageQueue&) = delete;
/// Thread safe insert the message.
void put(const Payload& value);
void put(const std::string& value)
{
put(Payload(value.data(), value.data() + value.size()));
}
/// Thread safe obtaining of the message.
Payload get();
/// Thread safe removal of all the pending messages.
void clear();
/// Thread safe remove_if.
void remove_if(std::function<bool(const Payload&)> pred);
private:
std::mutex _mutex;
std::condition_variable _cv;
protected:
virtual void put_impl(const Payload& value);
virtual bool wait_impl() const;
virtual Payload get_impl();
virtual void clear_impl();
std::deque<Payload> _queue;
};
/** MessageQueue specialized for handling of tiles.
Used for basic handling of incoming requests, only can remove tiles when it
gets a "canceltiles" command.
*/
class BasicTileQueue : public MessageQueue
{
protected:
virtual void put_impl(const Payload& value);
};
/** MessageQueue specialized for priority handling of tiles.
2016-04-01 07:29:43 -05:00
This class builds on BasicTileQueue, and additonaly provides de-duplication
of tile requests.
TODO: we'll need to add reordering of the tiles at some stage here too - so
that the ones closest to the cursor position are returned first.
*/
class TileQueue : public BasicTileQueue
{
protected:
virtual void put_impl(const Payload& value);
};
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */