зеркало из https://github.com/mozilla/gecko-dev.git
144 строки
3.9 KiB
C++
144 строки
3.9 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_mscom_AgileReference_h
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#define mozilla_mscom_AgileReference_h
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#include "mozilla/Attributes.h"
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#include "mozilla/RefPtr.h"
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#include "nsISupportsImpl.h"
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#include <objidl.h>
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namespace mozilla {
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namespace mscom {
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namespace detail {
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class MOZ_HEAP_CLASS GlobalInterfaceTableCookie final {
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public:
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GlobalInterfaceTableCookie(IUnknown* aObject, REFIID aIid,
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HRESULT& aOutHResult);
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bool IsValid() const { return !!mCookie; }
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HRESULT GetInterface(REFIID aIid, void** aOutInterface) const;
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GlobalInterfaceTableCookie)
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GlobalInterfaceTableCookie(const GlobalInterfaceTableCookie&) = delete;
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GlobalInterfaceTableCookie(GlobalInterfaceTableCookie&&) = delete;
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GlobalInterfaceTableCookie& operator=(const GlobalInterfaceTableCookie&) =
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delete;
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GlobalInterfaceTableCookie& operator=(GlobalInterfaceTableCookie&&) = delete;
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private:
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~GlobalInterfaceTableCookie();
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private:
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DWORD mCookie;
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private:
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static IGlobalInterfaceTable* ObtainGit();
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};
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} // namespace detail
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/**
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* This class encapsulates an "agile reference." These are references that
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* allow you to pass COM interfaces between apartments. When you have an
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* interface that you would like to pass between apartments, you wrap that
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* interface in an AgileReference and pass the agile reference instead. Then
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* you unwrap the interface by calling AgileReference::Resolve.
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*
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* Sample usage:
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*
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* // In the multithreaded apartment, foo is an IFoo*
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* auto myAgileRef = MakeUnique<AgileReference>(IID_IFoo, foo);
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*
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* // myAgileRef is passed to our main thread, which runs in a single-threaded
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* // apartment:
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*
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* RefPtr<IFoo> foo;
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* HRESULT hr = myAgileRef->Resolve(IID_IFoo, getter_AddRefs(foo));
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* // Now foo may be called from the main thread
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*/
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class AgileReference final {
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public:
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AgileReference();
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template <typename InterfaceT>
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explicit AgileReference(RefPtr<InterfaceT>& aObject)
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: AgileReference(__uuidof(InterfaceT), aObject) {}
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AgileReference(REFIID aIid, IUnknown* aObject);
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AgileReference(const AgileReference& aOther) = default;
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AgileReference(AgileReference&& aOther);
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~AgileReference();
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explicit operator bool() const {
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return mAgileRef || (mGitCookie && mGitCookie->IsValid());
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}
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HRESULT GetHResult() const { return mHResult; }
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template <typename T>
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void Assign(const RefPtr<T>& aOther) {
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Assign(__uuidof(T), aOther);
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}
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template <typename T>
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AgileReference& operator=(const RefPtr<T>& aOther) {
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Assign(aOther);
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return *this;
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}
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HRESULT Resolve(REFIID aIid, void** aOutInterface) const;
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AgileReference& operator=(const AgileReference& aOther);
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AgileReference& operator=(AgileReference&& aOther);
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AgileReference& operator=(decltype(nullptr)) {
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Clear();
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return *this;
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}
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void Clear();
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private:
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void Assign(REFIID aIid, IUnknown* aObject);
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void AssignInternal(IUnknown* aObject);
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private:
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IID mIid;
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RefPtr<IAgileReference> mAgileRef;
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RefPtr<detail::GlobalInterfaceTableCookie> mGitCookie;
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HRESULT mHResult;
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};
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} // namespace mscom
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} // namespace mozilla
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template <typename T>
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RefPtr<T>::RefPtr(const mozilla::mscom::AgileReference& aAgileRef)
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: mRawPtr(nullptr) {
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(*this) = aAgileRef;
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}
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template <typename T>
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RefPtr<T>& RefPtr<T>::operator=(
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const mozilla::mscom::AgileReference& aAgileRef) {
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void* newRawPtr;
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if (FAILED(aAgileRef.Resolve(__uuidof(T), &newRawPtr))) {
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newRawPtr = nullptr;
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}
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assign_assuming_AddRef(static_cast<T*>(newRawPtr));
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return *this;
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}
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#endif // mozilla_mscom_AgileReference_h
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