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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 .
*/
#include <sal/config.h>
#include <com/sun/star/uno/Reference.hxx>
#include <com/sun/star/util/XUpdatable.hpp>
#include <rtl/ref.hxx>
#include <osl/thread.hxx>
#include <salhelper/thread.hxx>
#include <condition_variable>
#include <chrono>
#include <vector>
#include <mutex>
#include <helper/wakeupthread.hxx>
using namespace std::chrono_literals;
/// We only need one thread to wake everyone up.
namespace
{
class SharedWakeUpThread final : public salhelper::Thread
{
static std::vector<css::uno::WeakReference<css::util::XUpdatable>> updatables;
std::condition_variable condition;
bool terminate;
public:
static rtl::Reference<SharedWakeUpThread> wakeupThread;
static std::mutex& getMutex()
{
static std::mutex mutex;
return mutex;
}
SharedWakeUpThread()
: Thread("WakeUpThread")
, terminate(false)
{
assert(!wakeupThread);
launch();
}
void execute() override
{
while (true)
{
std::unique_lock g(getMutex());
condition.wait_for(g, 200ms, [this] { return terminate; });
if (terminate || updatables.empty())
break;
auto copyOfUpdatables = updatables;
g.unlock();
for (auto& it : copyOfUpdatables)
{
css::uno::Reference<css::util::XUpdatable> up(it);
if (up.is()) // check weak
up->update();
}
}
std::unique_lock g(getMutex());
if (updatables.empty())
{
terminate = false;
wakeupThread.clear();
}
}
static void startThread()
{
std::unique_lock g(getMutex());
if (!updatables.empty() && !wakeupThread)
wakeupThread = new SharedWakeUpThread();
}
void stopWithLock(std::unique_lock<std::mutex>& g)
{
terminate = true;
condition.notify_one();
g.unlock();
join();
}
static void disposeThreadWithLock(std::unique_lock<std::mutex>& g)
{
if (wakeupThread)
{
auto holdRef = wakeupThread;
wakeupThread.clear();
holdRef->stopWithLock(g);
}
assert(!wakeupThread);
}
static void add(css::uno::WeakReference<css::util::XUpdatable> up)
{
std::unique_lock g(getMutex());
updatables.push_back(up);
if (!wakeupThread)
wakeupThread = new SharedWakeUpThread();
}
static void remove(css::uno::WeakReference<css::util::XUpdatable> up)
{
std::unique_lock g(getMutex());
auto it = updatables.begin();
bool found = false;
for (; it != updatables.end(); ++it)
{
css::uno::Reference<css::util::XUpdatable> itValid(*it);
if (!itValid || *it == up)
{
it = updatables.erase(it);
found = true;
break;
}
}
(void)found; assert(found);
if (updatables.empty())
disposeThreadWithLock(g);
}
static void joinThread()
{
std::unique_lock g(getMutex());
disposeThreadWithLock(g);
}
};
rtl::Reference<SharedWakeUpThread> SharedWakeUpThread::wakeupThread;
std::vector<css::uno::WeakReference<css::util::XUpdatable>> SharedWakeUpThread::updatables;
}
namespace framework
{
/* static */ void WakeUpThread::startThread() { SharedWakeUpThread::startThread(); }
WakeUpThread::WakeUpThread(css::uno::Reference<css::util::XUpdatable> const& up)
: _updatable(up)
{
assert(_updatable);
SharedWakeUpThread::add(_updatable);
}
void WakeUpThread::stop() { SharedWakeUpThread::remove(_updatable); }
/* static */ void WakeUpThread::joinThread() { SharedWakeUpThread::joinThread(); }
} // namespace framework
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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