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// Copyright (c) 2010 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 "chrome/browser/geolocation/wifi_data_provider_common.h"
#include "base/utf_string_conversions.h"
string16 MacAddressAsString16(const uint8 mac_as_int[6]) {
// mac_as_int is big-endian. Write in byte chunks.
// Format is XX-XX-XX-XX-XX-XX.
static const wchar_t* const kMacFormatString =
L"%02x-%02x-%02x-%02x-%02x-%02x";
return WideToUTF16(StringPrintf(kMacFormatString,
mac_as_int[0], mac_as_int[1], mac_as_int[2],
mac_as_int[3], mac_as_int[4], mac_as_int[5]));
}
WifiDataProviderCommon::WifiDataProviderCommon()
: Thread("Geolocation_wifi_provider"),
is_first_scan_complete_(false),
ALLOW_THIS_IN_INITIALIZER_LIST(task_factory_(this)) {
}
WifiDataProviderCommon::~WifiDataProviderCommon() {
// Thread must be stopped before entering destructor chain to avoid race
// conditions; see comment in DeviceDataProvider::Unregister.
DCHECK(!IsRunning()); // Must call StopDataProvider before destroying me.
}
bool WifiDataProviderCommon::StartDataProvider() {
DCHECK(CalledOnClientThread());
DCHECK(!IsRunning()); // StartDataProvider must only be called once.
return Start();
}
void WifiDataProviderCommon::StopDataProvider() {
DCHECK(CalledOnClientThread());
Stop();
}
bool WifiDataProviderCommon::GetData(WifiData *data) {
DCHECK(CalledOnClientThread());
DCHECK(data);
base::AutoLock lock(data_mutex_);
*data = wifi_data_;
// If we've successfully completed a scan, indicate that we have all of the
// data we can get.
return is_first_scan_complete_;
}
// Thread implementation
void WifiDataProviderCommon::Init() {
DCHECK(wlan_api_ == NULL);
wlan_api_.reset(NewWlanApi());
if (wlan_api_ == NULL) {
// Error! Can't do scans, so don't try and schedule one.
is_first_scan_complete_ = true;
return;
}
DCHECK(polling_policy_ == NULL);
polling_policy_.reset(NewPollingPolicy());
DCHECK(polling_policy_ != NULL);
// Perform first scan ASAP regardless of the polling policy. If this scan
// fails we'll retry at a rate in line with the polling policy.
ScheduleNextScan(0);
}
void WifiDataProviderCommon::CleanUp() {
// Destroy these instances in the thread on which they were created.
wlan_api_.reset();
polling_policy_.reset();
}
void WifiDataProviderCommon::DoWifiScanTask() {
bool update_available = false;
WifiData new_data;
if (!wlan_api_->GetAccessPointData(&new_data.access_point_data)) {
ScheduleNextScan(polling_policy_->NoWifiInterval());
} else {
{
base::AutoLock lock(data_mutex_);
update_available = wifi_data_.DiffersSignificantly(new_data);
wifi_data_ = new_data;
}
polling_policy_->UpdatePollingInterval(update_available);
ScheduleNextScan(polling_policy_->PollingInterval());
}
if (update_available || !is_first_scan_complete_) {
is_first_scan_complete_ = true;
NotifyListeners();
}
}
void WifiDataProviderCommon::ScheduleNextScan(int interval) {
message_loop()->PostDelayedTask(
FROM_HERE,
task_factory_.NewRunnableMethod(&WifiDataProviderCommon::DoWifiScanTask),
interval);
}
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