gecko/dom/plugins/ipc/ScopedMethodFactory.h

88 lines
2.2 KiB
C++

/* 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_ScopedMethodFactory_h
#define mozilla_plugins_ScopedMethodFactory_h
#include <base/task.h>
/*
* This is based on the ScopedRunnableMethodFactory from ipc/chromium/src/base/task.h
* Chromiums 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).
* ScopedMethodFactory just provides cancellable tasks that don't assert this.
*/
namespace mozilla {
namespace plugins {
template<class T>
class ScopedMethodFactory : public RevocableStore
{
private:
template<class TaskType>
class TaskWrapper : public TaskType
{
public:
explicit TaskWrapper(RevocableStore* store) : revocable_(store) { }
virtual void Run() {
if (!revocable_.revoked())
TaskType::Run();
}
private:
Revocable revocable_;
};
public:
explicit ScopedMethodFactory(T* object) : object_(object) { }
template <class Method>
inline Task* NewRunnableMethod(Method method) {
typedef TaskWrapper<RunnableMethod<Method, Tuple0> > TaskWrapper;
TaskWrapper* task = new TaskWrapper(this);
task->Init(object_, method, MakeTuple());
return task;
}
template <class Method, class A>
inline Task* NewRunnableMethod(Method method, const A& a) {
typedef TaskWrapper<RunnableMethod<Method, Tuple1<A> > > TaskWrapper;
TaskWrapper* task = new TaskWrapper(this);
task->Init(object_, method, MakeTuple(a));
return task;
}
protected:
template <class Method, class Params>
class RunnableMethod : public Task {
public:
RunnableMethod() { }
void Init(T* obj, Method meth, const Params& params) {
obj_ = obj;
meth_ = meth;
params_ = params;
}
virtual void Run() { DispatchToMethod(obj_, meth_, params_); }
private:
T* obj_;
Method meth_;
Params params_;
};
private:
T* object_;
};
} // namespace plugins
} // namespace mozilla
#endif // mozilla_plugins_ScopedMethodFactory_h