mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-26 06:11:37 +00:00
49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=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/. */
|
|
|
|
#include "nsCOMPtr.h"
|
|
#include "nsITimer.h"
|
|
|
|
class nsIGeolocationUpdate;
|
|
class nsIGeolocationProvider;
|
|
|
|
/*
|
|
This class wraps the NetworkGeolocationProvider in a delayed startup.
|
|
It is for providing a fallback to MLS when:
|
|
1) using another provider as the primary provider, and
|
|
2) that primary provider may fail to return a result (i.e. the error returned
|
|
is indeterminate, or no error callback occurs)
|
|
|
|
The intent is that the primary provider is started, then MLSFallback
|
|
is started with sufficient delay that the primary provider will respond first
|
|
if successful (in the majority of cases).
|
|
|
|
MLS has an average response of 3s, so with the 2s default delay, a response can
|
|
be expected in 5s.
|
|
|
|
Telemetry is recommended to monitor that the primary provider is responding
|
|
first when expected to do so.
|
|
*/
|
|
class MLSFallback : public nsITimerCallback
|
|
{
|
|
public:
|
|
NS_DECL_ISUPPORTS
|
|
NS_DECL_NSITIMERCALLBACK
|
|
|
|
explicit MLSFallback(uint32_t delayMs = 2000);
|
|
nsresult Startup(nsIGeolocationUpdate* aWatcher);
|
|
nsresult Shutdown();
|
|
|
|
private:
|
|
nsresult CreateMLSFallbackProvider();
|
|
virtual ~MLSFallback();
|
|
nsCOMPtr<nsITimer> mHandoffTimer;
|
|
nsCOMPtr<nsIGeolocationProvider> mMLSFallbackProvider;
|
|
nsCOMPtr<nsIGeolocationUpdate> mUpdateWatcher;
|
|
const uint32_t mDelayMs;
|
|
};
|
|
|