| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "device/geolocation/wifi_data_provider.h" |
| |
| #include "base/bind.h" |
| #include "base/callback.h" |
| #include "base/location.h" |
| #include "base/threading/thread_task_runner_handle.h" |
| |
| namespace device { |
| |
| WifiDataProvider::WifiDataProvider() |
| : client_task_runner_(base::ThreadTaskRunnerHandle::Get()) { |
| DCHECK(client_task_runner_); |
| } |
| |
| WifiDataProvider::~WifiDataProvider() {} |
| |
| void WifiDataProvider::AddCallback(WifiDataUpdateCallback* callback) { |
| callbacks_.insert(callback); |
| } |
| |
| bool WifiDataProvider::RemoveCallback(WifiDataUpdateCallback* callback) { |
| return callbacks_.erase(callback) == 1; |
| } |
| |
| bool WifiDataProvider::has_callbacks() const { |
| return !callbacks_.empty(); |
| } |
| |
| void WifiDataProvider::RunCallbacks() { |
| client_task_runner_->PostTask( |
| FROM_HERE, base::Bind(&WifiDataProvider::DoRunCallbacks, this)); |
| } |
| |
| bool WifiDataProvider::CalledOnClientThread() const { |
| return client_task_runner()->BelongsToCurrentThread(); |
| } |
| |
| void WifiDataProvider::DoRunCallbacks() { |
| // It's possible that all the callbacks went away whilst this task was |
| // pending. This is fine; the loop will be a no-op. |
| CallbackSet::const_iterator iter = callbacks_.begin(); |
| while (iter != callbacks_.end()) { |
| WifiDataUpdateCallback* callback = *iter; |
| ++iter; // Advance iter before running, in case callback unregisters. |
| callback->Run(); |
| } |
| } |
| |
| } // namespace device |