gecko-dev/ipc/glue/TaskFactory.h
Emilio Cobos Álvarez 1e9c395548 Bug 1466168: Remove mozilla::Forward in favor of std::forward. r=froydnj
Same approach as the other bug, mostly replacing automatically by removing
'using mozilla::Forward;' and then:

  s/mozilla::Forward/std::forward/
  s/Forward</std::forward</

The only file that required manual fixup was TestTreeTraversal.cpp, which had
a class called TestNodeForward with template parameters :)

MozReview-Commit-ID: A88qFG5AccP
2018-06-02 09:33:26 +02:00

108 lines
2.8 KiB
C++

/* -*- 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 http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_plugins_TaskFactory_h
#define mozilla_plugins_TaskFactory_h
#include <base/task.h>
#include "mozilla/Move.h"
/*
* 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
{
private:
template<class TaskType>
class TaskWrapper : public TaskType
{
public:
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;
}
private:
Revocable revocable_;
};
public:
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();
}
protected:
template <class Method, class Params>
class RunnableMethod : public Runnable {
public:
RunnableMethod(T* obj, Method meth, const Params& params)
: Runnable("ipc::TaskFactory::RunnableMethod")
, obj_(obj)
, meth_(meth)
, params_(params)
{
}
NS_IMETHOD Run() override {
DispatchToMethod(obj_, meth_, params_);
return NS_OK;
}
private:
T* obj_;
Method meth_;
Params params_;
};
private:
T* object_;
};
} // namespace ipc
} // namespace mozilla
#endif // mozilla_plugins_TaskFactory_h