1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/file/AsyncHelper.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,56 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.8 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef mozilla_dom_file_asynchelper_h__
1.11 +#define mozilla_dom_file_asynchelper_h__
1.12 +
1.13 +#include "FileCommon.h"
1.14 +
1.15 +#include "nsIRequest.h"
1.16 +#include "nsIRunnable.h"
1.17 +
1.18 +class nsIRequestObserver;
1.19 +
1.20 +BEGIN_FILE_NAMESPACE
1.21 +
1.22 +/**
1.23 + * Must be subclassed. The subclass must implement DoStreamWork.
1.24 + * Async operations that are not supported in necko (truncate, flush, etc.)
1.25 + * should use this helper. Call AsyncWork to invoke the operation.
1.26 + */
1.27 +class AsyncHelper : public nsIRunnable,
1.28 + public nsIRequest
1.29 +{
1.30 +public:
1.31 + NS_DECL_THREADSAFE_ISUPPORTS
1.32 + NS_DECL_NSIRUNNABLE
1.33 + NS_DECL_NSIREQUEST
1.34 +
1.35 + nsresult
1.36 + AsyncWork(nsIRequestObserver* aObserver, nsISupports* aCtxt);
1.37 +
1.38 +protected:
1.39 + AsyncHelper(nsISupports* aStream)
1.40 + : mStream(aStream),
1.41 + mStatus(NS_OK)
1.42 + { }
1.43 +
1.44 + virtual ~AsyncHelper()
1.45 + { }
1.46 +
1.47 + virtual nsresult
1.48 + DoStreamWork(nsISupports* aStream) = 0;
1.49 +
1.50 +private:
1.51 + nsCOMPtr<nsISupports> mStream;
1.52 + nsCOMPtr<nsIRequestObserver> mObserver;
1.53 +
1.54 + nsresult mStatus;
1.55 +};
1.56 +
1.57 +END_FILE_NAMESPACE
1.58 +
1.59 +#endif // mozilla_dom_file_asynchelper_h__
