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98 lines
3.2 KiB
C++
98 lines
3.2 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Function.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/Optional.h>
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#include <AK/Queue.h>
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#include <LibCore/Event.h>
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#include <LibCore/EventLoop.h>
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#include <LibCore/Object.h>
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#include <LibThread/Lock.h>
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#include <LibThread/Thread.h>
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namespace LibThread {
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template<typename Result>
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class BackgroundAction;
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class BackgroundActionBase {
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template<typename Result>
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friend class BackgroundAction;
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private:
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BackgroundActionBase() { }
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static Lockable<Queue<Function<void()>>>& all_actions();
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static Thread& background_thread();
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};
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template<typename Result>
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class BackgroundAction final : public Core::Object
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, private BackgroundActionBase {
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C_OBJECT(BackgroundAction);
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public:
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static NonnullRefPtr<BackgroundAction<Result>> create(
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Function<Result()> action,
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Function<void(Result)> on_complete = nullptr)
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{
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return adopt(*new BackgroundAction(move(action), move(on_complete)));
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}
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virtual ~BackgroundAction() { }
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private:
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BackgroundAction(Function<Result()> action, Function<void(Result)> on_complete)
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: Core::Object(&background_thread())
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, m_action(move(action))
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, m_on_complete(move(on_complete))
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{
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LOCKER(all_actions().lock());
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all_actions().resource().enqueue([this] {
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m_result = m_action();
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if (m_on_complete) {
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Core::EventLoop::current().post_event(*this, make<Core::DeferredInvocationEvent>([this](auto&) {
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m_on_complete(m_result.release_value());
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this->remove_from_parent();
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}));
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Core::EventLoop::wake();
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} else {
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this->remove_from_parent();
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}
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});
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}
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Function<Result()> m_action;
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Function<void(Result)> m_on_complete;
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Optional<Result> m_result;
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};
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}
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