public DataFile(dbModel model)
{
Opened = false;
m_mapPort = MemoryMappedFile.Create(MapProtection.PageReadWrite, 4, model.Name);
m_bytes = new Dictionary <int, byte[]>();
m_cacheSR = new Dictionary <SearchRequest, SearchResult>(new SearchRequest.EqualityComparer());
m_lockFile = new ReaderWriterLockSlim();
m_lockCache = new ReaderWriterLockSlim();
m_FileName = model.Name + ".df";
m_FilePath = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), m_FileName);
http_Init(model);
try
{
if (File.Exists(m_FilePath))
{
FileInfo fi = new FileInfo(m_FilePath);
m_FileSize = (int)fi.Length;
m_mapFile = MemoryMappedFile.Create(m_FilePath, MapProtection.PageReadWrite, m_FileSize);
if (m_FileSize > m_HeaderSize)
{
byte[] buf = new byte[m_FileSize];
using (Stream view = m_mapFile.MapView(MapAccess.FileMapRead, 0, m_FileSize))
view.Read(buf, 0, m_FileSize);
if (bindHeader(buf) == false)
{
return;
}
}
}
else
{
m_Capacity = m_BlobGrowSize;
m_FileSize = m_HeaderSize + (m_Capacity * m_BlobSizeMax) + 1;
m_mapFile = MemoryMappedFile.Create(m_FilePath, MapProtection.PageReadWrite, m_FileSize);
//string fs = _model.Name + ";" + string.Join(",", _model.Fields.Select(x => ((int)x.Type).ToString() + x.Name).ToArray());
writeHeaderBlank(model);
}
Opened = true;
if (m_listItems == null)
{
m_listItems = (IList)typeof(List <>).MakeGenericType(m_typeDynamic).GetConstructor(Type.EmptyTypes).Invoke(null);
}
}
catch
{
}
}
private void http_Init(dbModel model)
{
TcpListener l = new TcpListener(IPAddress.Loopback, 0);
l.Start();
Port = ((IPEndPoint)l.LocalEndpoint).Port;
l.Stop();
using (Stream view = m_mapPort.MapView(MapAccess.FileMapWrite, 0, 4))
view.Write(BitConverter.GetBytes(Port), 0, 4);
listener = new HttpListener();
listener.Prefixes.Add("http://*:" + Port.ToString() + "/");
listener.Start();
listener.BeginGetContext(ProcessRequest, listener);
}
private Type buildTypeDynamic(dbModel m)
{
if (m == null || string.IsNullOrEmpty(m.Name) || m.Fields == null || m.Fields.Length == 0)
{
return(null);
}
Type type = DynamicExpression.CreateClass(m.Fields);
//DynamicProperty[] at = new DynamicProperty[]
//{
// new DynamicProperty("Name", typeof(string)),
// new DynamicProperty("Birthday", typeof(DateTime))
//};
//object obj = Activator.CreateInstance(type);
//t.GetProperty("Name").SetValue(obj, "Albert", null);
//t.GetProperty("Birthday").SetValue(obj, new DateTime(1879, 3, 14), null);
var model = ProtoBuf.Meta.RuntimeTypeModel.Default;
// Obtain all serializable types having no explicit proto contract
var serializableTypes = Assembly.GetExecutingAssembly()
.GetTypes()
.Where(t => t.IsSerializable && !Attribute.IsDefined(t, typeof(ProtoContractAttribute)));
var metaType = model.Add(type, false);
metaType.AsReferenceDefault = true;
metaType.UseConstructor = false;
// Add contract for all the serializable fields
var serializableFields = type
.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
.Where(fi => !Attribute.IsDefined(fi, typeof(NonSerializedAttribute)))
.OrderBy(fi => fi.Name) // it's important to keep the same fields order in all the AppDomains
.Select((fi, k) => new { info = fi, index = k });
foreach (var field in serializableFields)
{
var metaField = metaType.AddField(field.index + 1, field.info.Name);
metaField.AsReference = !field.info.FieldType.IsValueType; // cyclic references support
metaField.DynamicType = field.info.FieldType == typeof(object); // any type support
}
// Compile model in place for better performance, .Compile() can be used if all types are known beforehand
model.CompileInPlace();
return(type);
}
private void writeHeaderBlank(dbModel m)
{
////////////////////////////////////////////////
// HEADER = [4 bytes blob len] + [8 byte ID] + [4 bytes Capacity] + [4 bytes Count] + [980 byte fields] = 1,000
// [4 bytes blob LEN]
byte[] _byteBlobLEN = BitConverter.GetBytes(m_BlobLEN);
// [8 byte ID]
m_FileID = long.Parse(DateTime.Now.ToString("yyMMddHHmmssfff"));
byte[] _byteFileID = BitConverter.GetBytes(m_FileID).ToArray();
// [4 bytes Capacity]
byte[] _byteCapacity = BitConverter.GetBytes(m_Capacity);
// [4 bytes Count]
byte[] _byteCount = BitConverter.GetBytes(m_Count);
// [980 byte fields]
byte[] bm;
using (var ms = new MemoryStream())
{
new JsonSerializer().Serialize(new BsonWriter(ms), m);
bm = ms.ToArray();
}
byte[] bm7 = SevenZip.Compression.LZMA.SevenZipHelper.Compress(bm);
List <byte> _byteFields = new List <byte>();
_byteFields.AddRange(BitConverter.GetBytes(bm7.Length));
_byteFields.AddRange(bm7);
_byteFields.AddRange(new byte[980 - _byteFields.Count]);
m_typeDynamic = buildTypeDynamic(m);
List <byte> ls = new List <byte>();
ls.AddRange(_byteBlobLEN);
ls.AddRange(_byteFileID);
ls.AddRange(_byteCapacity);
ls.AddRange(_byteCount);
ls.AddRange(_byteFields);
using (Stream view = m_mapFile.MapView(MapAccess.FileMapWrite, 0, ls.Count))
view.Write(ls.ToArray(), 0, ls.Count);
}
