/// <summary>
/// The execution entry point.
/// </summary>
public static void Run()
{
// We are booting; try to retrieve the boot count.
s_numBootsExtendedWeakReference =
ExtendedWeakReference.RecoverOrCreate(
typeof(TypeUniqueToOurApp), // The unique type that identifies the data.
0, // The ID of the specific data item.
ExtendedWeakReference.c_SurviveBoot); // The CLR should try to persist data across a reboot.
// Indicate how important this data is. The CLR discards
// OkayToThrowAway items first, then NiceToHave items, then
// Important items, then Critical items, and finally System items.
// In practice, System items are virtually never discarded.
s_numBootsExtendedWeakReference.Priority =
(Int32)ExtendedWeakReference.PriorityLevel.Important;
// Try to get the persisted data, initializing it if it is not
// available. The Target property of the extended weak reference
// must be cast to the actual type of the object. The Target
// property is cast to prevent the object from being
// garbage-collected unexpectedly.
NumBoots numBoots = (NumBoots)s_numBootsExtendedWeakReference.Target;
if (numBoots == null)
{
// The object could not be found in flash memory, so create the
// object and initialize it.
Debug.Print(
"The device was booted for the first time, or the boot counter was lost. Initializing the boot counter to 1.");
numBoots = new NumBoots(1);
}
else
{
// The object was found in flash memory; increment the boot
// counter.
numBoots = new NumBoots(numBoots.BootCount + 1);
Debug.Print("Successfully read boot counter. This is boot #" +
numBoots.BootCount);
}
// Set the Target property of the extended weak reference to the
// boot count object, triggering persistence.
s_numBootsExtendedWeakReference.Target = numBoots;
// The CLR needs some time to asynchronously store the data in
// flash. In this sample application, we use a two-second Sleep.
// A real application would simply continue without delay. This app
// only needs to sleep because the application is about to end.
// The system provides no guarantee about when the data will
// actually be stored in flash memory. When the data is actually
// stored depends on the size of the object and the speed of the
// flash memory.
// System.Threading.Thread.Sleep(2000);
}
public static object LoadFromFlash(Type dataType, uint id)
{
ewr = ExtendedWeakReference.RecoverOrCreate(dataType, id, ExtendedWeakReference.c_SurvivePowerdown | ExtendedWeakReference.c_SurviveBoot);
// Indicate how important this data is. The CLR discards from first to last:
// OkayToThrowAway items
// NiceToHave items
// Important items
// Critical items
// System items.
// In practice, System items are virtually never discarded.
ewr.Priority = (Int32)ExtendedWeakReference.PriorityLevel.System;
return ewr.Target;
}
public static Options LoadFromFlash(uint id)
{
ewr = ExtendedWeakReference.RecoverOrCreate(typeof(string), id, ExtendedWeakReference.c_SurvivePowerdown | ExtendedWeakReference.c_SurviveBoot);
// Indicate how important this data is. The CLR discards from first to last:
// OkayToThrowAway items
// NiceToHave items
// Important items
// Critical items
// System items.
// In practice, System items are virtually never discarded.
ewr.Priority = (Int32)ExtendedWeakReference.PriorityLevel.System;
Options res = null;
if (ewr.Target != null)
res = Options.FromXml((string)ewr.Target);
return res ?? new Options();
}
private TetrisApp()
{
// Create the object that configures the GPIO pins to buttons.
GPIOButtonInputProvider inputProvider = new GPIOButtonInputProvider(null);
// Create ExtendedWeakReference for high score table
highScoreEWD = ExtendedWeakReference.RecoverOrCreate(
typeof(TetrisApp),
0,
ExtendedWeakReference.c_SurvivePowerdown);
// Set persistance priority
highScoreEWD.Priority = (int)ExtendedWeakReference.PriorityLevel.Important;
// Try to recover previously saved HighScore
HighScore = (HighScoreTable)highScoreEWD.Target;
// If nothing was recovered - create new
if (HighScore == null)
HighScore = new HighScoreTable();
}
static ResourceUtility()
{
try
{
s_ewr = ExtendedWeakReference.RecoverOrCreate(typeof(ResourceUtility), s_idSelectorCultureInfo, ExtendedWeakReference.c_SurviveBoot | ExtendedWeakReference.c_SurvivePowerdown);
s_ewr.Priority = (int)ExtendedWeakReference.PriorityLevel.System;
string ciName = (string)s_ewr.Target;
if (ciName != null)
{
CultureInfo ci = new CultureInfo(ciName);
CurrentUICultureInternal = ci;
}
}
catch
{
}
}
static ResourceUtility()
{
try
{
s_ewr = ExtendedWeakReference.RecoverOrCreate(typeof(ResourceUtility), s_idSelectorCultureInfo, ExtendedWeakReference.c_SurviveBoot | ExtendedWeakReference.c_SurvivePowerdown);
s_ewr.Priority = (int)ExtendedWeakReference.PriorityLevel.System;
string ciName = (string)s_ewr.Target;
if (ciName != null)
{
CultureInfo ci = new CultureInfo(ciName);
CurrentUICultureInternal = ci;
}
}
catch
{
}
}
public static void Main()
{
//try to recover the data or create the weak reference
bootInfoExtendedWeakReference =
ExtendedWeakReference.RecoverOrCreate(
typeof(MyUniqueSelectorType), //unique type to prevent other code from accessing our data
0, //id that refers to the data we care about
ExtendedWeakReference.c_SurvivePowerdown | ExtendedWeakReference.c_SurviveBoot);
//set how important the data is
bootInfoExtendedWeakReference.Priority = (int)ExtendedWeakReference.PriorityLevel.Important;
//try to get the persisted data
//if we get the data, then putting it in the field myBootInfo creates a
//strong reference to it, preventing the GC from collecting it
MyBootInfo myBootInfo = (MyBootInfo)bootInfoExtendedWeakReference.Target;
if (myBootInfo == null)
{
//the data could not be obtained
Debug.Print("This is the first time the device booted or the data was lost.");
myBootInfo = new MyBootInfo(1); //first initialization
}
else
{
//the data could be obtained, display info
Debug.Print("Number of boots = " + myBootInfo.BootCount);
myBootInfo = new MyBootInfo(myBootInfo.BootCount + 1); //increment number of boots
}
//setting the Target property causes to write the data to flash memory
bootInfoExtendedWeakReference.Target = myBootInfo;
//give the system time to save it to flash
System.Threading.Thread.Sleep(2000);
}
/// <summary>
/// Static constructor so that we can load the certificate map from EWR prior to usage.
/// </summary>
static CertificateStore()
{
s_ewrCertLookup = ExtendedWeakReference.RecoverOrCreate(typeof(_CertLookup_), (uint)0, ExtendedWeakReference.c_SurvivePowerdown);
if (s_ewrCertLookup.Target == null)
{
s_ewrCertLookup.Priority = (int)ExtendedWeakReference.PriorityLevel.Critical;
s_personalCertData = new _CertLookup_();
s_ewrCertLookup.Target = s_personalCertData;
}
else
{
s_personalCertData = s_ewrCertLookup.Target as _CertLookup_;
}
s_ewrCALookup = ExtendedWeakReference.RecoverOrCreate(typeof(_CertLookup_), (uint)1, ExtendedWeakReference.c_SurvivePowerdown);
if (s_ewrCALookup.Target == null)
{
s_ewrCALookup.Priority = (int)ExtendedWeakReference.PriorityLevel.Critical;
s_CACertData = new _CALookup_();
s_ewrCALookup.Target = s_CACertData;
}
else
{
s_CACertData = s_ewrCALookup.Target as _CALookup_;
}
}
private uint GetNextFreeIndex()
{
uint idx = 0;
if (m_values.Count > 0)
{
idx = (uint)m_values[m_values.Count - 1] + 1;
// overflow - collapse indexes
if (idx == 0)
{
for (int i = 0; i < m_values.Count; i++)
{
// if the current index matches the lookup value then we are already in the correct position
if (idx == (uint)m_values[i])
{
idx++;
}
else
{
// collapse cert indexes
ExtendedWeakReference ewr = ExtendedWeakReference.Recover(typeof(_CertStore_), (uint)m_values[i]);
if (ewr != null)
{
X509Certificate cert = ewr.Target as X509Certificate;
ewr.Target = null;
ewr = new ExtendedWeakReference(cert, typeof(_CertStore_), idx, ExtendedWeakReference.c_SurvivePowerdown);
ewr.Priority = (int)ExtendedWeakReference.PriorityLevel.Critical;
ewr.Target = cert;
ewr.PushBackIntoRecoverList();
m_values[i] = (uint)idx;
// increment active index count only if we have a valid EWR certificate
idx++;
}
}
}
}
}
return idx;
}
private static void LoadCalibrationPoints()
{
ewrCalibrationPoints = ExtendedWeakReference.RecoverOrCreate(typeof(CalibrationPointsID), 0, ExtendedWeakReference.c_SurvivePowerdown | ExtendedWeakReference.c_SurviveBoot);
ewrCalibrationPoints.Priority = (int)ExtendedWeakReference.PriorityLevel.System;
calibrationPoints = (CalibrationPoints)ewrCalibrationPoints.Target;
}
//--//
static public ExtendedWeakReference RecoverOrCreate(Type selector, uint id, uint flags)
{
ExtendedWeakReference wr = ExtendedWeakReference.Recover(selector, id);
return((wr != null) ? wr : new ExtendedWeakReference(null, selector, id, flags));
}
public static Layout Load(uint id)
{
ewr = ExtendedWeakReference.RecoverOrCreate(typeof(string), id, ExtendedWeakReference.c_SurvivePowerdown | ExtendedWeakReference.c_SurviveBoot);
ewr.Priority = (int)ExtendedWeakReference.PriorityLevel.System;
Layout res = null;
if (ewr.Target != null)
res = Layout.FromXml((string)ewr.Target);
return res ?? new Layout();
}
private void LoadData()
{
ConfigEWR = ExtendedWeakReference.RecoverOrCreate(typeof(Config), 0, ExtendedWeakReference.c_SurviveBoot | ExtendedWeakReference.c_SurvivePowerdown);
ConfigEWR.Priority = (int)ExtendedWeakReference.PriorityLevel.Critical;
wifiNetworks.Clear();
if(EnableWifiSetupNetworks) APDetails.AddSetupAPs(wifiNetworks);
Config config = ConfigEWR.Target as Config;
if (config == null)
{
config = new Config();
config.UniqueID = "";
var random = new Random();
for (int i = 0; i < 20; i++) { config.UniqueID += random.Next(10).ToString(); }
ConfigEWR.Target = config;
Debug.Print("Created new configuration in flash");
}
else
{
if (config.APDetails != null) for (var i = 0; i < config.APDetails.Length; i++)
{
wifiNetworks.Insert(i, config.APDetails[i]);
Debug.Print("Loaded WiFi config for SSID " + config.APDetails[i].SSID);
}
}
DeviceUniqueID = config.UniqueID;
Debug.Print("Device unique ID is " + DeviceUniqueID);
}
public static TouchCalibrationPoints Load()
{
_ewr = ExtendedWeakReference.RecoverOrCreate(typeof(TouchCalibrationPoints), 0, ExtendedWeakReference.c_SurvivePowerdown);
_ewr.Priority = (int)ExtendedWeakReference.PriorityLevel.Important;
return _ewr.Target == null ? null : new TouchCalibrationPoints((TouchCalibrationData)_ewr.Target);
}
public void Initialize(Type appType)
{
_ewrSettings = ExtendedWeakReference.RecoverOrCreate(appType, 0, ExtendedWeakReference.c_SurvivePowerdown);
_ewrSettings.Priority = (Int32)ExtendedWeakReference.PriorityLevel.Important;
if (_ewrSettings.Target==null)
{
_currentSettings = new SettingsEntity()
{
ConfigUrl = "https://vauthscus.blob.core.windows.net/deviceconfig/",
NodeId = "85331753-a1ef-4aaa-bfa1-4fa00343bf49",
HaveConfigId = "",
WifiSSID = "cloudgate", WifiPassword = "******", // because we don't have onboarding figured out yet
GatewayUrl = "",
BootCount = 0, DroppedMessages = 0
};
CommitChanges();
}
else
{
_currentSettings = (SettingsEntity)_ewrSettings.Target;
}
}
