/// <summary>
/// Called while initializing OppCommHandler, to load neighbor records from file.
/// </summary>
private void readNeighborHistory()
{
lock (neighborRecords)
{
neighborRecords.Clear();
StreamReader reader = null;
if (File.Exists(neighborFilePath) == false)
return;
reader = File.OpenText(neighborFilePath);
string lastLogDateTime = reader.ReadLine();
while (reader.EndOfStream == false)
{
//Reading MyDeviceID
string deviceID = reader.ReadLine().Trim();
NeighborRecord neighbor = new NeighborRecord(deviceID);
//Reading and loading applications
string[] applications = reader.ReadLine().Trim().Split(new char[] { ' ' });
foreach (string appID in applications)
neighbor.Applications.Add(appID);
//Reading and loading RSSI values & qualities
string[] rssiValues = reader.ReadLine().Trim().Split(new char[] { ' ' });
string[] rssiQualities = reader.ReadLine().Trim().Split(new char[] { ' ' });
if (rssiValues.Length != rssiQualities.Length)
{
Logger.addEntry("[OppCommHandler]Internal Error: RSSI Value & Quality not matching");
}
for (int i = 0; i < rssiValues.Length; i++)
neighbor.addRssi(Int32.Parse(rssiValues[i]), NeighborRecord.getStrengthType(rssiQualities[i]));
//Adding neighbor to in-program data strcture
neighborRecords.Add(neighbor);
}
reader.Close();
}
}
private void PerformDiscovery(Object placeHolder)
{
if (radioController.isWiFiRadioON() == true)
{
//If DiscoveryFlag is true and SSID is not associated with Device ID, SSID has to be re-associated
//Reason: If device discovery thread is not involved inn session processing, it should be visible.
if (DiscoveryFlag == true && wiFiCard.getAssociatedAP().Equals(makeSSID()) == false) //Disconnected from my SSID
{
Logger.addEntry("Connecting to proper AP");
bool success = false;
int i = 0;
do
{
success = wiFiCard.connectToAP(makeSSID());
i++;
} while (success == false && i < DiscoverySSIDTries);
if (success == false)
Logger.addEntry("Failed to advertise device!");
}
else //perform normal device discovery
{
List<AdHocAccessPoint> neighbors = wiFiCard.getAdHocNeighborCollection();
foreach (AdHocAccessPoint neighbor in neighbors)
{
string[] neighborSSIDParts = getneighborID(neighbor.Name);
if (neighborSSIDParts != null)
{
string neighborDevID = neighborSSIDParts[0];
//Proceed if only it is not my own device ID
if (neighborDevID.Equals(MyDeviceID) == false)
{
lock (neighborRecords)
{
NeighborRecord foundRecord = neighborRecords.Find(delegate(NeighborRecord record)
{
return record.DeviceID.Equals(neighborDevID);
});
string[] neighborAppIDs = new string[neighborSSIDParts.Length - 1];
Array.Copy(neighborSSIDParts, 1, neighborAppIDs, 0, neighborAppIDs.Length);
if (foundRecord != null) //foundRecord will be null if record not found? YES.
{
//Getting only the AppIDs
foundRecord.updateApps(neighborAppIDs);
foundRecord.addRssi(neighbor.SignalStrengthInDecibels, neighbor.SignalStrengthQuality);
//Updating 'neighborRecords' not required. Updating on 'foundRecord' updates the list also.
}
else
{
//Add new neighbor to database
NeighborRecord newRecord = new NeighborRecord(neighborDevID);
newRecord.updateApps(neighborAppIDs);
newRecord.addRssi(neighbor.SignalStrengthInDecibels, neighbor.SignalStrengthQuality);
neighborRecords.Add(newRecord);
}
}
}
}
}
lock (neighborRecords)
{
//Checks for a neighborRecord to see whether it was found in currently scanned/discovered neighbors.
//If it was not found, update its RSSI to NoSignal in 'neighborRecords'
List<NeighborRecord> removalList = new List<NeighborRecord>();
foreach (NeighborRecord neighborRecord in neighborRecords)
{
bool neighborScannedPresently = neighbors.Exists(delegate(AdHocAccessPoint ap)
{
string[] neighborSSIDParts = getneighborID(ap.Name);
if (neighborSSIDParts != null)
{
string neighborDevID = neighborSSIDParts[0];
return neighborRecord.DeviceID.Equals(neighborDevID);
}
return false;
});
if (neighborScannedPresently == false)
{
neighborRecord.addRssi(NeighborRecord.NoSignalRSSI, StrengthType.NoSignal);
bool neighborFarGone = true;
foreach (StrengthType rssiQ in neighborRecord.RssiQualityHistory)
{
if (rssiQ != StrengthType.NoSignal)
{
neighborFarGone = false;
break;
}
}
if (neighborFarGone == true)
removalList.Add(neighborRecord);
}
}
//Delete refrences to old neighbors from 'neighborRecords'
foreach (NeighborRecord neighbor in removalList)
neighborRecords.Remove(neighbor);
}
}
}
else
{
Logger.addEntry("Radio Error: Restarting Radio..");
radioController.setWiFiRadio(true);
}
}