dom/geolocation/MLSFallback.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "MLSFallback.h"
   8 #include "GeolocationPosition.h"
   9 #include "nsComponentManagerUtils.h"
  10 #include "nsIGeolocationProvider.h"
  11 #include "nsServiceManagerUtils.h"
  12
  13 NS_IMPL_ISUPPORTS(MLSFallback, nsITimerCallback, nsINamed)
  14
  15 MLSFallback::MLSFallback(uint32_t delay) : mDelayMs(delay) {}
  16
  17 MLSFallback::~MLSFallback() = default;
  18
  19 nsresult MLSFallback::Startup(nsIGeolocationUpdate* aWatcher) {
  20   if (mHandoffTimer || mMLSFallbackProvider) {
  21     return NS_OK;
  22   }
  23
  24   mUpdateWatcher = aWatcher;
  25
  26   // No need to schedule a timer callback if there is no startup delay.
  27   if (mDelayMs == 0) {
  28     return CreateMLSFallbackProvider();
  29   }
  30
  31   return NS_NewTimerWithCallback(getter_AddRefs(mHandoffTimer), this, mDelayMs,
  32                                  nsITimer::TYPE_ONE_SHOT);
  33 }
  34
  35 nsresult MLSFallback::Shutdown() {
  36   mUpdateWatcher = nullptr;
  37
  38   if (mHandoffTimer) {
  39     mHandoffTimer->Cancel();
  40     mHandoffTimer = nullptr;
  41   }
  42
  43   nsresult rv = NS_OK;
  44   if (mMLSFallbackProvider) {
  45     rv = mMLSFallbackProvider->Shutdown();
  46     mMLSFallbackProvider = nullptr;
  47   }
  48   return rv;
  49 }
  50
  51 NS_IMETHODIMP
  52 MLSFallback::Notify(nsITimer* aTimer) { return CreateMLSFallbackProvider(); }
  53
  54 NS_IMETHODIMP
  55 MLSFallback::GetName(nsACString& aName) {
  56   aName.AssignLiteral("MLSFallback");
  57   return NS_OK;
  58 }
  59
  60 nsresult MLSFallback::CreateMLSFallbackProvider() {
  61   if (mMLSFallbackProvider || !mUpdateWatcher) {
  62     return NS_OK;
  63   }
  64
  65   nsresult rv;
  66   mMLSFallbackProvider =
  67       do_CreateInstance("@mozilla.org/geolocation/mls-provider;1", &rv);
  68   NS_ENSURE_SUCCESS(rv, rv);
  69
  70   if (mMLSFallbackProvider) {
  71     rv = mMLSFallbackProvider->Startup();
  72     if (NS_SUCCEEDED(rv)) {
  73       mMLSFallbackProvider->Watch(mUpdateWatcher);
  74     }
  75   }
  76   mUpdateWatcher = nullptr;
  77   return rv;
  78 }