libreoffice-online/loolwsd/MessageQueue.cpp
Miklos Vajna 78308db763 loolwsd: remaining 'unnecessary copy' fixes
Change-Id: I138e8473a002a15aae7752136950bb905a21fb1f
2016-04-27 14:58:33 +02:00

121 lines
3.2 KiB
C++

/* -*- 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/.
*/
#include "MessageQueue.hpp"
#include <algorithm>
MessageQueue::~MessageQueue()
{
clear();
}
void MessageQueue::put(const Payload& value)
{
std::unique_lock<std::mutex> lock(_mutex);
put_impl(value);
lock.unlock();
_cv.notify_one();
}
MessageQueue::Payload MessageQueue::get()
{
std::unique_lock<std::mutex> lock(_mutex);
_cv.wait(lock, [this] { return wait_impl(); });
return get_impl();
}
void MessageQueue::clear()
{
std::unique_lock<std::mutex> lock(_mutex);
clear_impl();
}
void MessageQueue::remove_if(const std::function<bool(const Payload&)>& pred)
{
std::unique_lock<std::mutex> lock(_mutex);
std::remove_if(_queue.begin(), _queue.end(), pred);
}
void MessageQueue::put_impl(const Payload& value)
{
_queue.push_back(value);
}
bool MessageQueue::wait_impl() const
{
return _queue.size() > 0;
}
MessageQueue::Payload MessageQueue::get_impl()
{
auto result = _queue.front();
_queue.pop_front();
return result;
}
void MessageQueue::clear_impl()
{
_queue.clear();
}
void BasicTileQueue::put_impl(const Payload& value)
{
const auto msg = std::string(&value[0], value.size());
if (msg == "canceltiles")
{
// remove all the existing tiles from the queue
_queue.erase(std::remove_if(_queue.begin(), _queue.end(),
[](const Payload& v)
{
// must not remove the tiles with 'id=', they are special, used
// eg. for previews etc.
const auto tmp = std::string(&v[0], v.size());
return (tmp.compare(0, 5, "tile ") == 0) && (tmp.find("id=") == std::string::npos);
}
),
_queue.end());
// put the "canceltiles" in front of other messages
_queue.push_front(value);
}
else
{
MessageQueue::put_impl(value);
}
}
void TileQueue::put_impl(const Payload& value)
{
const auto msg = std::string(&value[0], value.size());
if (msg.compare(0, 5, "tile ") == 0)
{
// TODO: implement a real re-ordering here, so that the tiles closest to
// the cursor are returned first.
// * we will want to put just a general "tile" message to the queue
// * add a std::set that handles the tiles
// * change the get_impl() to decide which tile is the correct one to
// be returned
// * we will also need to be informed about the position of the cursor
// so that get_impl() returns optimal results
//
// For now: just don't put duplicates into the queue
for (auto it = _queue.cbegin(); it != _queue.cend(); ++it)
{
if (value == *it)
{
return;
}
}
}
BasicTileQueue::put_impl(value);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */