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// 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
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