зеркало из https://github.com/mozilla/gecko-dev.git
98 строки
2.8 KiB
C++
98 строки
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_plugins_TaskFactory_h
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#define mozilla_plugins_TaskFactory_h
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#include <base/task.h>
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#include "mozilla/Move.h"
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/*
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* This is based on the ScopedRunnableMethodFactory from
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* ipc/chromium/src/base/task.h Chromium's factories assert if tasks are created
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* and run on different threads, which is something we need to do in
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* PluginModuleParent (hang UI vs. main thread). TaskFactory just provides
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* cancellable tasks that don't assert this. This version also allows both
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* ScopedMethod and regular Tasks to be generated by the same Factory object.
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*/
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namespace mozilla {
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namespace ipc {
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template <class T>
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class TaskFactory : public RevocableStore {
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private:
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template <class TaskType>
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class TaskWrapper : public TaskType {
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public:
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template <typename... Args>
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explicit TaskWrapper(RevocableStore* store, Args&&... args)
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: TaskType(std::forward<Args>(args)...), revocable_(store) {}
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NS_IMETHOD Run() override {
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if (!revocable_.revoked()) TaskType::Run();
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return NS_OK;
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}
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private:
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Revocable revocable_;
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};
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public:
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explicit TaskFactory(T* object) : object_(object) {}
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template <typename TaskParamType, typename... Args>
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inline already_AddRefed<TaskParamType> NewTask(Args&&... args) {
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typedef TaskWrapper<TaskParamType> TaskWrapper;
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RefPtr<TaskWrapper> task =
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new TaskWrapper(this, std::forward<Args>(args)...);
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return task.forget();
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}
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template <class Method, typename... Args>
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inline already_AddRefed<Runnable> NewRunnableMethod(Method method,
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Args&&... args) {
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typedef decltype(base::MakeTuple(std::forward<Args>(args)...)) ArgTuple;
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typedef RunnableMethod<Method, ArgTuple> RunnableMethod;
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typedef TaskWrapper<RunnableMethod> TaskWrapper;
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RefPtr<TaskWrapper> task = new TaskWrapper(
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this, object_, method, base::MakeTuple(std::forward<Args>(args)...));
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return task.forget();
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}
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protected:
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template <class Method, class Params>
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class RunnableMethod : public Runnable {
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public:
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RunnableMethod(T* obj, Method meth, const Params& params)
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: Runnable("ipc::TaskFactory::RunnableMethod"),
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obj_(obj),
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meth_(meth),
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params_(params) {}
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NS_IMETHOD Run() override {
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DispatchToMethod(obj_, meth_, params_);
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return NS_OK;
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}
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private:
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T* obj_;
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Method meth_;
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Params params_;
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};
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private:
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T* object_;
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};
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} // namespace ipc
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} // namespace mozilla
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#endif // mozilla_plugins_TaskFactory_h
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