private void SaveDelta(Delta delta)
{
if (MODE == "DATABASE")
{
NmsContext nmsContext = new NmsContext();
DeltaModel deltaModel = new DeltaModel();
deltaModel.Time = DateTime.Now;
deltaModel.Delta = ObjectToByteArray(delta);
nmsContext.DeltaModels.Add(deltaModel);
nmsContext.SaveChanges();
string message = string.Format("Insert new Delta into database successfully finished. ");
CommonTrace.WriteTrace(CommonTrace.TraceInfo, message);
Console.WriteLine(message);
}
else
{
bool fileExisted = false;
if (File.Exists(Config.Instance.ConnectionString))
{
fileExisted = true;
}
FileStream fs = new FileStream(Config.Instance.ConnectionString, FileMode.OpenOrCreate, FileAccess.ReadWrite);
fs.Seek(0, SeekOrigin.Begin);
BinaryReader br = null;
int deltaCount = 0;
if (fileExisted)
{
br = new BinaryReader(fs);
deltaCount = br.ReadInt32();
}
BinaryWriter bw = new BinaryWriter(fs);
fs.Seek(0, SeekOrigin.Begin);
delta.Id = ++deltaCount;
byte[] deltaSerialized = delta.Serialize();
int deltaLength = deltaSerialized.Length;
bw.Write(deltaCount);
fs.Seek(0, SeekOrigin.End);
bw.Write(deltaLength);
bw.Write(deltaSerialized);
if (br != null)
{
br.Close();
br.Dispose();
}
bw.Close();
bw.Dispose();
fs.Close();
fs.Dispose();
}
}
private List <Delta> ReadAllDeltas()
{
if (MODE == "DATABASE")
{
string message = string.Empty;
List <Delta> result = new List <Delta>();
List <DeltaModel> resultDelta = new List <DeltaModel>();
NmsContext nmsContext = new NmsContext();
try
{
resultDelta = nmsContext.DeltaModels.OrderBy(x => x.Time).ToList();
foreach (var item in resultDelta)
{
byte[] delta_byte = item.Delta as byte[];
result.Add(ByteArrayToObject(delta_byte) as Delta);
TraceDelta(ByteArrayToObject(delta_byte) as Delta);
}
}
catch (Exception e)
{
message = string.Format("Failed to read Delta from database. {0}", e.Message);
CommonTrace.WriteTrace(CommonTrace.TraceError, message);
Console.WriteLine(message);
return(new List <Delta>());
}
deltaCount = result.Count;
message = string.Format("Successfully read {0} Delta from database.", result.Count.ToString());
CommonTrace.WriteTrace(CommonTrace.TraceInfo, message);
Console.WriteLine(message);
return(result);
}
else
{
List <Delta> result = new List <Delta>();
if (!File.Exists(Config.Instance.ConnectionString))
{
return(result);
}
FileStream fs = new FileStream(Config.Instance.ConnectionString, FileMode.OpenOrCreate, FileAccess.Read);
fs.Seek(0, SeekOrigin.Begin);
if (fs.Position < fs.Length) // if it is not empty stream
{
BinaryReader br = new BinaryReader(fs);
int deltaCount = br.ReadInt32();
int deltaLength = 0;
byte[] deltaSerialized = null;
Delta delta = null;
for (int i = 0; i < deltaCount; i++)
{
deltaLength = br.ReadInt32();
deltaSerialized = new byte[deltaLength];
br.Read(deltaSerialized, 0, deltaLength);
delta = Delta.Deserialize(deltaSerialized);
result.Add(delta);
}
br.Close();
}
fs.Close();
return(result);
}
return(null);
}