78 lines
1.6 KiB
C++
78 lines
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_net_AutoClose_h
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#define mozilla_net_AutoClose_h
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#include "nsCOMPtr.h"
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#include "mozilla/Mutex.h"
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namespace mozilla { namespace net {
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// Like an nsAutoPtr for XPCOM streams (e.g. nsIAsyncInputStream) and other
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// refcounted classes that need to have the Close() method called explicitly
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// before they are destroyed.
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template <typename T>
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class AutoClose
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{
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public:
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AutoClose() : mMutex("net::AutoClose.mMutex") { }
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~AutoClose(){
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CloseAndRelease();
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}
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explicit operator bool()
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{
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MutexAutoLock lock(mMutex);
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return mPtr;
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}
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already_AddRefed<T> forget()
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{
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MutexAutoLock lock(mMutex);
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return mPtr.forget();
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}
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void takeOver(nsCOMPtr<T> & rhs)
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{
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already_AddRefed<T> other = rhs.forget();
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TakeOverInternal(&other);
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}
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void CloseAndRelease()
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{
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TakeOverInternal(nullptr);
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}
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private:
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void TakeOverInternal(already_AddRefed<T> *aOther)
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{
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nsCOMPtr<T> ptr;
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{
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MutexAutoLock lock(mMutex);
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ptr.swap(mPtr);
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if (aOther) {
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mPtr = *aOther;
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}
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}
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if (ptr) {
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ptr->Close();
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}
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}
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void operator=(const AutoClose<T> &) = delete;
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AutoClose(const AutoClose<T> &) = delete;
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nsCOMPtr<T> mPtr;
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Mutex mMutex;
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};
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} // namespace net
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} // namespace mozilla
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#endif // mozilla_net_AutoClose_h
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