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https://github.com/LadybirdBrowser/ladybird.git
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e9121f8b1f
Core::deferred_invoke is a way of executing an action after previously queued events have been processed. It removes the requirement of having/being a Core::Object subclass in order to defer invocation through Core::Object::deferred_invoke. Core::Object::deferred_invoke now delegates to Core::deferred_invoke. The version with the Object& argument is still present but will be removed in the following commits. This commit additionally fixes a new places where the DeferredInvocationEvent was dispatched to the event loop directly, and replaces them with the Core::deferred_invoke equivalent.
87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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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 <LibThreading/Thread.h>
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namespace Threading {
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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 void enqueue_work(Function<void()>);
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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(BackgroundAction&)> action,
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Function<void(Result)> on_complete = nullptr)
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{
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return adopt_ref(*new BackgroundAction(move(action), move(on_complete)));
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}
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void cancel()
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{
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m_cancelled = true;
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}
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bool is_cancelled() const
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{
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return m_cancelled;
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}
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virtual ~BackgroundAction() { }
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private:
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BackgroundAction(Function<Result(BackgroundAction&)> 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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enqueue_work([this] {
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m_result = m_action(*this);
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if (m_on_complete) {
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deferred_invoke([this] {
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m_on_complete(m_result.release_value());
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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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bool m_cancelled { false };
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Function<Result(BackgroundAction&)> 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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