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58 lines
1.3 KiB
C++
58 lines
1.3 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_dom_AsyncHelper_h
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#define mozilla_dom_AsyncHelper_h
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#include "nsCOMPtr.h"
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#include "nsIRequest.h"
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#include "nsIRunnable.h"
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class nsIRequestObserver;
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namespace mozilla {
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namespace dom {
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/**
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* Must be subclassed. The subclass must implement DoStreamWork.
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* Async operations that are not supported in necko (truncate, flush, etc.)
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* should use this helper. Call AsyncWork to invoke the operation.
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*/
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class AsyncHelper : public nsIRunnable,
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public nsIRequest
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{
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIRUNNABLE
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NS_DECL_NSIREQUEST
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nsresult
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AsyncWork(nsIRequestObserver* aObserver, nsISupports* aCtxt);
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protected:
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explicit AsyncHelper(nsISupports* aStream)
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: mStream(aStream),
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mStatus(NS_OK)
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{ }
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virtual ~AsyncHelper()
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{ }
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virtual nsresult
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DoStreamWork(nsISupports* aStream) = 0;
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private:
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nsCOMPtr<nsISupports> mStream;
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nsCOMPtr<nsIRequestObserver> mObserver;
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nsresult mStatus;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_AsyncHelper_h
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