forked from mirrors/gecko-dev
265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
48 lines
1.6 KiB
C++
48 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=8 sts=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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsCOMPtr.h"
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#include "nsITimer.h"
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#include "nsINamed.h"
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class nsIGeolocationUpdate;
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class nsIGeolocationProvider;
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/*
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This class wraps the NetworkGeolocationProvider in a delayed startup.
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It is for providing a fallback to MLS when:
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1) using another provider as the primary provider, and
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2) that primary provider may fail to return a result (i.e. the error returned
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is indeterminate, or no error callback occurs)
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The intent is that the primary provider is started, then MLSFallback
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is started with sufficient delay that the primary provider will respond first
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if successful (in the majority of cases).
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MLS has an average response of 3s, so with the 2s default delay, a response can
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be expected in 5s.
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Telemetry is recommended to monitor that the primary provider is responding
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first when expected to do so.
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*/
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class MLSFallback : public nsITimerCallback, public nsINamed {
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSITIMERCALLBACK
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NS_DECL_NSINAMED
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explicit MLSFallback(uint32_t delayMs = 2000);
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nsresult Startup(nsIGeolocationUpdate* aWatcher);
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nsresult Shutdown();
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private:
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nsresult CreateMLSFallbackProvider();
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virtual ~MLSFallback();
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nsCOMPtr<nsITimer> mHandoffTimer;
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nsCOMPtr<nsIGeolocationProvider> mMLSFallbackProvider;
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nsCOMPtr<nsIGeolocationUpdate> mUpdateWatcher;
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const uint32_t mDelayMs;
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};
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