зеркало из https://github.com/mozilla/gecko-dev.git
156 строки
3.3 KiB
C++
156 строки
3.3 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_mscom_Factory_h
|
|
#define mozilla_mscom_Factory_h
|
|
|
|
#if defined(MOZILLA_INTERNAL_API)
|
|
#error This code is NOT for internal Gecko use!
|
|
#endif // defined(MOZILLA_INTERNAL_API)
|
|
|
|
#include "mozilla/Attributes.h"
|
|
#include "mozilla/DebugOnly.h"
|
|
#include "mozilla/Move.h"
|
|
#include "mozilla/RefPtr.h"
|
|
#include "mozilla/StaticPtr.h"
|
|
#include "Module.h"
|
|
|
|
#include <objbase.h>
|
|
#include <unknwn.h>
|
|
|
|
/* WARNING! The code in this file may be loaded into the address spaces of other
|
|
processes! It MUST NOT link against xul.dll or other Gecko binaries! Only
|
|
inline code may be included! */
|
|
|
|
namespace mozilla {
|
|
namespace mscom {
|
|
|
|
template <typename T>
|
|
class MOZ_NONHEAP_CLASS Factory : public IClassFactory
|
|
{
|
|
template <typename... Args>
|
|
HRESULT DoCreate(Args... args)
|
|
{
|
|
MOZ_DIAGNOSTIC_ASSERT(false, "This should not be executed");
|
|
return E_NOTIMPL;
|
|
}
|
|
|
|
template <typename... Args>
|
|
HRESULT DoCreate(HRESULT (*aFnPtr)(IUnknown*, REFIID, void**), Args... args)
|
|
{
|
|
return aFnPtr(mozilla::Forward<Args>(args)...);
|
|
}
|
|
|
|
public:
|
|
// IUnknown
|
|
STDMETHODIMP QueryInterface(REFIID aIid, void** aOutInterface) override
|
|
{
|
|
if (!aOutInterface) {
|
|
return E_INVALIDARG;
|
|
}
|
|
|
|
if (aIid == IID_IUnknown || aIid == IID_IClassFactory) {
|
|
RefPtr<IClassFactory> punk(this);
|
|
punk.forget(aOutInterface);
|
|
return S_OK;
|
|
}
|
|
|
|
*aOutInterface = nullptr;
|
|
|
|
return E_NOINTERFACE;
|
|
}
|
|
|
|
STDMETHODIMP_(ULONG) AddRef() override
|
|
{
|
|
Module::Lock();
|
|
return 2;
|
|
}
|
|
|
|
STDMETHODIMP_(ULONG) Release() override
|
|
{
|
|
Module::Unlock();
|
|
return 1;
|
|
}
|
|
|
|
// IClassFactory
|
|
STDMETHODIMP CreateInstance(IUnknown* aOuter, REFIID aIid,
|
|
void** aOutInterface) override
|
|
{
|
|
return DoCreate(&T::Create, aOuter, aIid, aOutInterface);
|
|
}
|
|
|
|
STDMETHODIMP LockServer(BOOL aLock) override
|
|
{
|
|
if (aLock) {
|
|
Module::Lock();
|
|
} else {
|
|
Module::Unlock();
|
|
}
|
|
return S_OK;
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
class MOZ_NONHEAP_CLASS SingletonFactory : public Factory<T>
|
|
{
|
|
public:
|
|
STDMETHODIMP CreateInstance(IUnknown* aOuter, REFIID aIid,
|
|
void** aOutInterface) override
|
|
{
|
|
if (aOuter || !aOutInterface) {
|
|
return E_INVALIDARG;
|
|
}
|
|
|
|
RefPtr<T> obj(sInstance);
|
|
if (!obj) {
|
|
obj = GetOrCreateSingleton();
|
|
}
|
|
|
|
return obj->QueryInterface(aIid, aOutInterface);
|
|
}
|
|
|
|
RefPtr<T> GetOrCreateSingleton()
|
|
{
|
|
if (!sInstance) {
|
|
RefPtr<T> object;
|
|
if (FAILED(T::Create(getter_AddRefs(object)))) {
|
|
return nullptr;
|
|
}
|
|
|
|
sInstance = object.forget();
|
|
}
|
|
|
|
return sInstance;
|
|
}
|
|
|
|
RefPtr<T> GetSingleton()
|
|
{
|
|
return sInstance;
|
|
}
|
|
|
|
void ClearSingleton()
|
|
{
|
|
if (!sInstance) {
|
|
return;
|
|
}
|
|
|
|
DebugOnly<HRESULT> hr = ::CoDisconnectObject(sInstance.get(), 0);
|
|
MOZ_ASSERT(SUCCEEDED(hr));
|
|
sInstance = nullptr;
|
|
}
|
|
|
|
private:
|
|
static StaticRefPtr<T> sInstance;
|
|
};
|
|
|
|
template <typename T>
|
|
StaticRefPtr<T> SingletonFactory<T>::sInstance;
|
|
|
|
} // namespace mscom
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_mscom_Factory_h
|