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