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-rw-r--r--netwerk/base/AutoClose.h62
1 files changed, 62 insertions, 0 deletions
diff --git a/netwerk/base/AutoClose.h b/netwerk/base/AutoClose.h
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+++ b/netwerk/base/AutoClose.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=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_net_AutoClose_h
+#define mozilla_net_AutoClose_h
+
+#include "nsCOMPtr.h"
+#include "mozilla/Mutex.h"
+
+namespace mozilla {
+namespace net {
+
+// A container 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) { TakeOverInternal(rhs.forget()); }
+
+ void CloseAndRelease() { TakeOverInternal(nullptr); }
+
+ private:
+ void TakeOverInternal(already_AddRefed<T>&& aOther) {
+ nsCOMPtr<T> ptr(std::move(aOther));
+ {
+ MutexAutoLock lock(mMutex);
+ ptr.swap(mPtr);
+ }
+
+ if (ptr) {
+ ptr->Close();
+ }
+ }
+
+ void operator=(const AutoClose<T>&) = delete;
+ AutoClose(const AutoClose<T>&) = delete;
+
+ nsCOMPtr<T> mPtr;
+ Mutex mMutex MOZ_UNANNOTATED;
+};
+
+} // namespace net
+} // namespace mozilla
+
+#endif // mozilla_net_AutoClose_h