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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 */
#ifndef mozilla_plugins_TaskFactory_h
#define mozilla_plugins_TaskFactory_h
#include <base/task.h>
#include <utility>
* This is based on the ScopedRunnableMethodFactory from
* ipc/chromium/src/base/task.h Chromium's factories assert if tasks are created
* and run on different threads, which is something we need to do in
* PluginModuleParent (hang UI vs. main thread). TaskFactory just provides
* cancellable tasks that don't assert this. This version also allows both
* ScopedMethod and regular Tasks to be generated by the same Factory object.
namespace mozilla {
namespace ipc {
template <class T>
class TaskFactory : public RevocableStore {
template <class TaskType>
class TaskWrapper : public TaskType {
template <typename... Args>
explicit TaskWrapper(RevocableStore* store, Args&&... args)
: TaskType(std::forward<Args>(args)...), revocable_(store) {}
NS_IMETHOD Run() override {
if (!revocable_.revoked()) TaskType::Run();
return NS_OK;
Revocable revocable_;
explicit TaskFactory(T* object) : object_(object) {}
template <typename TaskParamType, typename... Args>
inline already_AddRefed<TaskParamType> NewTask(Args&&... args) {
typedef TaskWrapper<TaskParamType> TaskWrapper;
RefPtr<TaskWrapper> task =
new TaskWrapper(this, std::forward<Args>(args)...);
return task.forget();
template <class Method, typename... Args>
inline already_AddRefed<Runnable> NewRunnableMethod(Method method,
Args&&... args) {
typedef decltype(base::MakeTuple(std::forward<Args>(args)...)) ArgTuple;
typedef RunnableMethod<Method, ArgTuple> RunnableMethod;
typedef TaskWrapper<RunnableMethod> TaskWrapper;
RefPtr<TaskWrapper> task = new TaskWrapper(
this, object_, method, base::MakeTuple(std::forward<Args>(args)...));
return task.forget();
template <class Method, class Params>
class RunnableMethod : public Runnable {
RunnableMethod(T* obj, Method meth, const Params& params)
: Runnable("ipc::TaskFactory::RunnableMethod"),
params_(params) {}
NS_IMETHOD Run() override {
DispatchToMethod(obj_, meth_, params_);
return NS_OK;
T* obj_;
Method meth_;
Params params_;
T* object_;
} // namespace ipc
} // namespace mozilla
#endif // mozilla_plugins_TaskFactory_h