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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#pragma once
#include <cppuhelper/compbase.hxx>
#include <osl/conditn.hxx>
#include <osl/mutex.hxx>
#include <osl/process.h>
#include <rtl/ustrbuf.hxx>
#include "filepicker_ipc_commands.hxx"
#include <functional>
#include <future>
#include <mutex>
#include <thread>
#include <sstream>
OUString getResString(const char* pResId);
class Gtk3KDE5FilePickerIpc
{
protected:
oslProcess m_process;
oslFileHandle m_inputWrite;
oslFileHandle m_outputRead;
// simple multiplexing: every command gets its own ID that can be used to
// read the corresponding response
uint64_t m_msgId = 1;
std::mutex m_mutex;
uint64_t m_incomingResponse = 0;
std::string m_responseBuffer;
std::stringstream m_responseStream;
public:
explicit Gtk3KDE5FilePickerIpc();
~Gtk3KDE5FilePickerIpc();
sal_Int16 execute();
void writeResponseLine(const std::string& line);
template <typename... Args> uint64_t sendCommand(Commands command, const Args&... args)
{
auto id = m_msgId;
++m_msgId;
std::stringstream stream;
sendIpcArgs(stream, id, command, args...);
writeResponseLine(stream.str());
return id;
}
std::string readResponseLine();
// workaround gcc <= 4.8 bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55914
template <int...> struct seq
{
};
template <int N, int... S> struct gens : gens<N - 1, N - 1, S...>
{
};
template <int... S> struct gens<0, S...>
{
typedef seq<S...> type;
};
template <typename... Args> struct ArgsReader
{
ArgsReader(Args&... args)
: m_args(args...)
{
}
void operator()(std::istream& stream)
{
callFunc(stream, typename gens<sizeof...(Args)>::type());
}
private:
template <int... S> void callFunc(std::istream& stream, seq<S...>)
{
readIpcArgs(stream, std::get<S>(m_args)...);
}
std::tuple<Args&...> m_args;
};
template <typename... Args> void readResponse(uint64_t id, Args&... args)
{
// read synchronously from a background thread and run the eventloop until the value becomes available
// this allows us to keep the GUI responsive and also enables access to the LO clipboard
ArgsReader<Args...> argsReader(args...);
await(std::async(std::launch::async, [&]() {
while (true)
{
// only let one thread read at any given time
std::lock_guard<std::mutex> lock(m_mutex);
// check if we need to read (and potentially wait) a response ID
if (m_incomingResponse == 0)
{
m_responseStream.clear();
m_responseStream.str(readResponseLine());
readIpcArgs(m_responseStream, m_incomingResponse);
}
if (m_incomingResponse == id)
{
// the response we are waiting for came in
argsReader(m_responseStream);
m_incomingResponse = 0;
break;
}
else
{
// the next response answers some other request, yield
std::this_thread::yield();
}
}
}));
}
private:
std::function<void()> blockMainWindow();
static void await(const std::future<void>& future);
};
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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