mirror of
https://github.com/clementine-player/Clementine
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137 lines
4.1 KiB
C++
137 lines
4.1 KiB
C++
/* This file is part of Clementine.
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Copyright 2012, David Sansome <me@davidsansome.com>
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Clementine is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Clementine is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Clementine. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CONCURRENTRUN_H
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#define CONCURRENTRUN_H
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#include <tr1/functional>
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#include <QFuture>
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#include <QRunnable>
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#include <QThreadPool>
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/*
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The aim of ThreadFunctor classes and ConcurrentRun::Run() functions is to
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complete QtConcurrentRun, which lack support for using a particular
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QThreadPool, as it always uses QThreadPool::globalInstance().
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This is problematic when we do not want to share the same thread pool over
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all the application, but want to keep the convenient QtConcurrent::run()
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functor syntax.
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With ConcurrentRun::Run(), time critical changes can be performed in their
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own pool, which is not empty by other actions (as it happens when using
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QtConcurrentRun::run()).
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ThreadFunctor classes are used to store a functor and its arguments, and
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Run() functions are used for convenience: to directly create a new
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ThreadFunctor object and start it.
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Currently, only functions with one or two arguments and a return value are
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supported, but other might be added easily for X arguments by defining a new
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ThreadFunctorBasX class, and add new Run() function.
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*/
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template<typename ReturnType>
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class ThreadFunctorBase : public QFutureInterface<ReturnType>, public QRunnable {
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public:
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ThreadFunctorBase() {}
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QFuture<ReturnType> Start(QThreadPool* thread_pool) {
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this->setRunnable(this);
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this->reportStarted();
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Q_ASSERT(thread_pool);
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QFuture<ReturnType> future = this->future();
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thread_pool->start(this, 0 /* priority: currently we do not support
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changing the priority. Might be added later
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if needed */);
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return future;
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}
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virtual void run() = 0;
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void End() {
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this->reportResult(result_);
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this->reportFinished();
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}
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protected:
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ReturnType result_;
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};
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template<typename ReturnType, typename Arg>
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class ThreadFunctor1 : public ThreadFunctorBase<ReturnType> {
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public:
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ThreadFunctor1(std::tr1::function<ReturnType (Arg)> function,
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const Arg& arg)
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: function_(function),
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arg_(arg)
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{ }
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void run() {
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this->result_ = function_(arg_);
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ThreadFunctorBase<ReturnType>::End();
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}
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private:
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std::tr1::function<ReturnType (Arg)> function_;
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Arg arg_;
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};
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template<typename ReturnType, typename Arg1, typename Arg2>
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class ThreadFunctor2 : public ThreadFunctorBase<ReturnType> {
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public:
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ThreadFunctor2(std::tr1::function<ReturnType (Arg1, Arg2)> function,
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const Arg1& arg1, const Arg2& arg2)
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: function_(function),
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arg1_(arg1),
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arg2_(arg2)
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{ }
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void run() {
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this->result_ = function_(arg1_, arg2_);
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ThreadFunctorBase<ReturnType>::End();
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}
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private:
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std::tr1::function<ReturnType (Arg1, Arg2)> function_;
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Arg1 arg1_;
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Arg2 arg2_;
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};
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namespace ConcurrentRun {
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template<typename ReturnType, typename Arg>
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QFuture<ReturnType> Run(
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QThreadPool* threadpool,
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std::tr1::function<ReturnType (Arg)> function,
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const Arg& arg) {
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return (new ThreadFunctor1<ReturnType, Arg>(function, arg))->Start(threadpool);
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}
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template<typename ReturnType, typename Arg1, typename Arg2>
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QFuture<ReturnType> Run(
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QThreadPool* threadpool,
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std::tr1::function<ReturnType (Arg1, Arg2)> function,
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const Arg1& arg1, const Arg2& arg2) {
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return (new ThreadFunctor2<ReturnType, Arg1, Arg2>(function, arg1, arg2))->Start(threadpool);
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}
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}
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#endif // CONCURRENTRUN_H
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