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| 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 #include "base/bind.h" |
| 8 #include "base/callback.h" |
| 9 #include "base/location.h" |
| 10 #include "base/threading/thread_task_runner_handle.h" |
| 11 |
| 12 namespace content { |
| 13 |
| 14 WifiDataProvider::WifiDataProvider() |
| 15 : client_task_runner_(base::ThreadTaskRunnerHandle::Get()) { |
| 16 DCHECK(client_task_runner_); |
| 17 } |
| 18 |
| 19 WifiDataProvider::~WifiDataProvider() { |
| 20 } |
| 21 |
| 22 void WifiDataProvider::AddCallback(WifiDataUpdateCallback* callback) { |
| 23 callbacks_.insert(callback); |
| 24 } |
| 25 |
| 26 bool WifiDataProvider::RemoveCallback(WifiDataUpdateCallback* callback) { |
| 27 return callbacks_.erase(callback) == 1; |
| 28 } |
| 29 |
| 30 bool WifiDataProvider::has_callbacks() const { |
| 31 return !callbacks_.empty(); |
| 32 } |
| 33 |
| 34 void WifiDataProvider::RunCallbacks() { |
| 35 client_task_runner_->PostTask( |
| 36 FROM_HERE, base::Bind(&WifiDataProvider::DoRunCallbacks, this)); |
| 37 } |
| 38 |
| 39 bool WifiDataProvider::CalledOnClientThread() const { |
| 40 return client_task_runner()->BelongsToCurrentThread(); |
| 41 } |
| 42 |
| 43 void WifiDataProvider::DoRunCallbacks() { |
| 44 // It's possible that all the callbacks went away whilst this task was |
| 45 // pending. This is fine; the loop will be a no-op. |
| 46 CallbackSet::const_iterator iter = callbacks_.begin(); |
| 47 while (iter != callbacks_.end()) { |
| 48 WifiDataUpdateCallback* callback = *iter; |
| 49 ++iter; // Advance iter before running, in case callback unregisters. |
| 50 callback->Run(); |
| 51 } |
| 52 } |
| 53 |
| 54 } // namespace content |
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