content/browser/geolocation/wifi_data_provider.cc

   1 // Copyright 2013 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/geolocation/wifi_data_provider.h"
   6
   7 namespace content {
   8
   9 WifiDataProvider::WifiDataProvider()
  10     : client_loop_(base::MessageLoop::current()) {
  11   DCHECK(client_loop_);
  12 }
  13
  14 WifiDataProvider::~WifiDataProvider() {
  15 }
  16
  17 void WifiDataProvider::AddCallback(WifiDataUpdateCallback* callback) {
  18   callbacks_.insert(callback);
  19 }
  20
  21 bool WifiDataProvider::RemoveCallback(WifiDataUpdateCallback* callback) {
  22   return callbacks_.erase(callback) == 1;
  23 }
  24
  25 bool WifiDataProvider::has_callbacks() const {
  26   return !callbacks_.empty();
  27 }
  28
  29 void WifiDataProvider::RunCallbacks() {
  30   client_loop_->task_runner()->PostTask(
  31       FROM_HERE, base::Bind(&WifiDataProvider::DoRunCallbacks, this));
  32 }
  33
  34 bool WifiDataProvider::CalledOnClientThread() const {
  35   return base::MessageLoop::current() == this->client_loop_;
  36 }
  37
  38 base::MessageLoop* WifiDataProvider::client_loop() const {
  39   return client_loop_;
  40 }
  41
  42 void WifiDataProvider::DoRunCallbacks() {
  43   // It's possible that all the callbacks went away whilst this task was
  44   // pending. This is fine; the loop will be a no-op.
  45   CallbackSet::const_iterator iter = callbacks_.begin();
  46   while (iter != callbacks_.end()) {
  47     WifiDataUpdateCallback* callback = *iter;
  48     ++iter;  // Advance iter before running, in case callback unregisters.
  49     callback->Run();
  50   }
  51 }
  52
  53 }  // namespace content