зеркало из https://github.com/mozilla/gecko-dev.git
67 строки
2.6 KiB
C++
67 строки
2.6 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_FastMarshaler_h
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#define mozilla_mscom_FastMarshaler_h
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#include "mozilla/Atomics.h"
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#include "mozilla/mscom/Aggregation.h"
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#include "mozilla/RefPtr.h"
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#include <objidl.h>
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namespace mozilla {
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namespace mscom {
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/**
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* COM ping functionality is enabled by default and is designed to free strong
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* references held by defunct client processes. However, this incurs a
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* significant performance penalty in a11y code due to large numbers of remote
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* objects being created and destroyed within a short period of time. Thus, we
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* turn off pings to improve performance.
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* ACHTUNG! When COM pings are disabled, Release calls from remote clients are
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* never sent to the server! If you use this marshaler, you *must* explicitly
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* disconnect clients using CoDisconnectObject when the object is no longer
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* relevant. Otherwise, references to the object will never be released, causing
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* a leak.
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*/
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class FastMarshaler final : public IMarshal {
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public:
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static HRESULT Create(IUnknown* aOuter, IUnknown** aOutMarshalerUnk);
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// IMarshal
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STDMETHODIMP GetUnmarshalClass(REFIID riid, void* pv, DWORD dwDestContext,
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void* pvDestContext, DWORD mshlflags,
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CLSID* pCid) override;
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STDMETHODIMP GetMarshalSizeMax(REFIID riid, void* pv, DWORD dwDestContext,
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void* pvDestContext, DWORD mshlflags,
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DWORD* pSize) override;
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STDMETHODIMP MarshalInterface(IStream* pStm, REFIID riid, void* pv,
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DWORD dwDestContext, void* pvDestContext,
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DWORD mshlflags) override;
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STDMETHODIMP UnmarshalInterface(IStream* pStm, REFIID riid,
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void** ppv) override;
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STDMETHODIMP ReleaseMarshalData(IStream* pStm) override;
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STDMETHODIMP DisconnectObject(DWORD dwReserved) override;
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private:
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FastMarshaler(IUnknown* aOuter, HRESULT* aResult);
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~FastMarshaler() = default;
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static DWORD GetMarshalFlags(DWORD aDestContext, DWORD aMshlFlags);
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Atomic<ULONG> mRefCnt;
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IUnknown* mOuter;
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RefPtr<IUnknown> mStdMarshalUnk;
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IMarshal* mStdMarshalWeak;
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DECLARE_AGGREGATABLE(FastMarshaler);
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};
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} // namespace mscom
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} // namespace mozilla
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#endif // mozilla_mscom_FastMarshaler_h
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