content/browser/background_sync/background_sync_network_observer.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/background_sync/background_sync_network_observer.h"
   6
   7 #include "base/location.h"
   8 #include "base/single_thread_task_runner.h"
   9 #include "base/thread_task_runner_handle.h"
  10 #include "content/public/browser/browser_thread.h"
  11
  12 namespace content {
  13
  14 BackgroundSyncNetworkObserver::BackgroundSyncNetworkObserver(
  15     const base::Closure& network_changed_callback)
  16     : connection_type_(net::NetworkChangeNotifier::GetConnectionType()),
  17       network_changed_callback_(network_changed_callback) {
  18   DCHECK_CURRENTLY_ON(BrowserThread::IO);
  19
  20   net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
  21 }
  22
  23 BackgroundSyncNetworkObserver::~BackgroundSyncNetworkObserver() {
  24   DCHECK_CURRENTLY_ON(BrowserThread::IO);
  25
  26   net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
  27 }
  28
  29 bool BackgroundSyncNetworkObserver::NetworkSufficient(
  30     SyncNetworkState network_state) {
  31   DCHECK_CURRENTLY_ON(BrowserThread::IO);
  32
  33   switch (network_state) {
  34     case NETWORK_STATE_ANY:
  35       return true;
  36     case NETWORK_STATE_AVOID_CELLULAR:
  37       // Note that this returns true for CONNECTION_UNKNOWN to avoid never
  38       // firing.
  39       return connection_type_ != net::NetworkChangeNotifier::CONNECTION_NONE &&
  40              !net::NetworkChangeNotifier::IsConnectionCellular(
  41                  connection_type_);
  42     case NETWORK_STATE_ONLINE:
  43       return connection_type_ != net::NetworkChangeNotifier::CONNECTION_NONE;
  44   }
  45
  46   NOTREACHED();
  47   return false;
  48 }
  49
  50 void BackgroundSyncNetworkObserver::NotifyNetworkChanged() {
  51   DCHECK_CURRENTLY_ON(BrowserThread::IO);
  52
  53   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
  54                                                 network_changed_callback_);
  55 }
  56
  57 void BackgroundSyncNetworkObserver::OnNetworkChanged(
  58     net::NetworkChangeNotifier::ConnectionType connection_type) {
  59   DCHECK_CURRENTLY_ON(BrowserThread::IO);
  60
  61   if (connection_type == connection_type_)
  62     return;
  63
  64   connection_type_ = connection_type;
  65   NotifyNetworkChanged();
  66 }
  67
  68 }  // namespace content