public static void GenerateSchemaDiff(String MemoryDatabaseFileOld, String MemoryDatabaseFileNew, String SchemaDiffFile)
{
var bs = Niveum.ObjectSchema.BinarySerializerWithString.Create();
var SchemaOld = LoadSchema(MemoryDatabaseFileOld, bs);
var SchemaNew = LoadSchema(MemoryDatabaseFileNew, bs);
var Dir = FileNameHandling.GetFileDirectory(SchemaDiffFile);
if (Dir != "" && !Directory.Exists(Dir))
{
Directory.CreateDirectory(Dir);
}
var d = RelationSchemaDiffGenerator.Generate(SchemaOld, SchemaNew);
RelationSchemaDiffVerifier.Verifiy(SchemaOld, SchemaNew, d.Mappings);
using (var sw = Txt.CreateTextWriter(SchemaDiffFile))
{
RelationSchemaDiffWriter.Write(sw, d);
}
}
public static void ApplySchemaDiff(String MemoryDatabaseFileOld, String MemoryDatabaseFileNew, String SchemaDiffFile, String MemoryDatabaseFileOutput)
{
var bs = Niveum.ObjectSchema.BinarySerializerWithString.Create();
Schema SchemaOld;
var SchemaNew = LoadSchema(MemoryDatabaseFileNew, bs);
var Loader = new RelationSchemaDiffLoader(SchemaNew);
Loader.LoadType(SchemaDiffFile);
var l = Loader.GetResult();
using (var fs = Streams.OpenReadable(MemoryDatabaseFileOld))
{
if (fs.ReadSimpleString(8) != "KRUSDATA")
{
throw new InvalidOperationException("FileFormatMismatch");
}
fs.ReadUInt64();
var OldSchemaLength = fs.ReadInt64();
if (OldSchemaLength == 0)
{
throw new InvalidOperationException("FileContainsNoSchema");
}
var OldSchemaPosition = fs.Position;
SchemaOld = bs.Read <Schema>(fs);
if (fs.Position != OldSchemaPosition + OldSchemaLength)
{
throw new InvalidOperationException();
}
fs.ReadInt64();
RelationSchemaDiffVerifier.Verifiy(SchemaOld, SchemaNew, l);
var orvs = new RelationValueSerializer(SchemaOld);
var nrvs = new RelationValueSerializer(SchemaNew);
var OldEntities = SchemaOld.Types.Where(t => t.OnEntity).Select(t => t.Entity).ToList();
var OldEntityNameToIndex = OldEntities.Select((e, i) => new KeyValuePair <String, int>(e.Name, i)).ToDictionary(p => p.Key, p => p.Value);
var NewEntities = SchemaNew.Types.Where(t => t.OnEntity).Select(t => t.Entity).ToList();
var dt = new RelationSchemaDiffTranslator(SchemaOld, SchemaNew, l);
var Dir = FileNameHandling.GetFileDirectory(MemoryDatabaseFileOutput);
if (Dir != "" && !Directory.Exists(Dir))
{
Directory.CreateDirectory(Dir);
}
var OldEntityCount = OldEntities.Count;
var Positions = new Dictionary <int, Int64>();
var CurrentEntityTableIndex = 0;
var CurrentCount = 0;
if (OldEntityCount > 0)
{
Positions.Add(0, fs.Position);
CurrentCount = fs.ReadInt32();
}
Action <int> AdvanceTo = EntityTableIndex =>
{
if (Positions.ContainsKey(EntityTableIndex))
{
fs.Position = Positions[EntityTableIndex];
CurrentEntityTableIndex = EntityTableIndex;
CurrentCount = fs.ReadInt32();
}
else
{
if ((EntityTableIndex < 0) || (EntityTableIndex >= OldEntityCount))
{
throw new InvalidOperationException();
}
while (CurrentEntityTableIndex < EntityTableIndex)
{
var rr = orvs.GetRowReader(OldEntities[CurrentEntityTableIndex]);
while (CurrentCount > 0)
{
rr(fs);
CurrentCount -= 1;
}
CurrentEntityTableIndex += 1;
if (CurrentEntityTableIndex >= OldEntityCount)
{
break;
}
Positions.Add(CurrentEntityTableIndex, fs.Position);
CurrentCount = fs.ReadInt32();
}
}
};
using (var fso = Streams.CreateResizable(MemoryDatabaseFileOutput))
{
fso.WriteSimpleString("KRUSDATA", 8);
fso.WriteUInt64(SchemaNew.Hash());
var SchemaLengthPosition = fso.Position;
fso.WriteInt64(0);
var SchemaPosition = fso.Position;
bs.Write(SchemaNew, fso);
var SchemaLength = fso.Position - SchemaPosition;
var DataLengthPosition = fso.Position;
fso.WriteInt64(0);
var DataPosition = fso.Position;
foreach (var ne in NewEntities)
{
var oOldEntityName = dt.GetOldEntityName(ne.Name);
if (oOldEntityName.OnNone)
{
fso.WriteInt32(0);
continue;
}
var Index = OldEntityNameToIndex[oOldEntityName.Some];
var rr = orvs.GetRowReader(OldEntities[Index]);
var rw = nrvs.GetRowWriter(ne);
var t = dt.GetTranslator(ne.Name);
AdvanceTo(Index);
fso.WriteInt32(CurrentCount);
while (CurrentCount > 0)
{
rw(fso, t(rr(fs)));
CurrentCount -= 1;
}
}
var DataLength = fso.Position - DataPosition;
fso.Position = SchemaLengthPosition;
fso.WriteInt64(SchemaLength);
fso.Position = DataLengthPosition;
fso.WriteInt64(DataLength);
}
}
}
