protected override bool ReleaseHandle()
{
_deleteInstance(this.handle);
//makes GC live easier
_newInstance = null;
_deleteInstance = null;
return true;
}
public DatabaseHandle(LibraryHandle libraryHandle)
: base(true)
{
LibraryHandle = libraryHandle;
_newInstance = libraryHandle.GetUnmanagedDelegate<NewInstanceDelegate>();
_deleteInstance = libraryHandle.GetUnmanagedDelegate<DeleteInstanceDelegate>();
this.handle = _newInstance(LibraryHandle);
if (IsInvalid)
{
throw new EjdbException("Unable to create ejdb instance");
}
}
//Creates new instance of ejdb. Don't know what' is it, but it looks it should be done before opening database
public unsafe DatabaseFunctions(LibraryHandle handle)
{
NewInstance = handle.GetUnmanagedDelegate <NewInstanceDelegate>();
DeleteInstance = handle.GetUnmanagedDelegate <DeleteInstanceDelegate>();
OpenDatabase = handle.GetUnmanagedDelegate <OpenDatabaseDelegate>();
CloseDatabase = handle.GetUnmanagedDelegate <CloseDatabaseDelegate>();
IsOpen = handle.GetUnmanagedDelegate <IsOpenDelegate>();
GetErrorCode = handle.GetUnmanagedDelegate <GetErrorCodeDelegate>();
GetMetadata = handle.GetUnmanagedDelegate <GetMetaDelegate>();
Command = handle.GetUnmanagedDelegate <CommandDelegate>();
Sync = handle.GetUnmanagedDelegate <SyncDelegate>();
}
private CtorAccessor(Type type)
{
if (type.IsValueType)
{
DynamicMethod dynamicNewInstance = new DynamicMethod("$NewInstance",
typeofObject,
zeroTypeArray,
type,
true);
ILGenerator newInstanceGen = dynamicNewInstance.GetILGenerator();
LocalBuilder v = newInstanceGen.DeclareLocal(type);
newInstanceGen.Emit(OpCodes.Ldloca_S, v);
newInstanceGen.Emit(OpCodes.Initobj, type);
newInstanceGen.Emit(OpCodes.Ldloc_S, v);
newInstanceGen.Emit(OpCodes.Box, type);
newInstanceGen.Emit(OpCodes.Ret);
newInstanceDelegate = (NewInstanceDelegate)dynamicNewInstance.CreateDelegate(typeofNewInstanceDelegate);
return;
}
BindingFlags bindingflags = BindingFlags.Instance |
BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.FlattenHierarchy;
ConstructorInfo ctor = type.GetConstructor(bindingflags, null, zeroTypeArray, zeroParameterModifierArray);
if (ctor != null)
{
DynamicMethod dynamicNewInstance = new DynamicMethod("$NewInstance",
typeofObject,
zeroTypeArray,
type,
true);
ILGenerator newInstanceGen = dynamicNewInstance.GetILGenerator();
newInstanceGen.Emit(OpCodes.Newobj, ctor);
newInstanceGen.Emit(OpCodes.Ret);
newInstanceDelegate = (NewInstanceDelegate)dynamicNewInstance.CreateDelegate(typeofNewInstanceDelegate);
}
else
{
ConstructorInfo[] ctors = type.GetConstructors(bindingflags);
Array.Sort(ctors, 0, ctors.Length, new ConstructorComparator());
for (int i = 0, length = ctors.Length; i < length; i++)
{
try {
DynamicMethod dynamicNewInstance = new DynamicMethod("$NewInstance",
typeofObject,
zeroTypeArray,
type,
true);
ParameterInfo[] pi = ctors[i].GetParameters();
int piLength = pi.Length;
ILGenerator newInstanceGen = dynamicNewInstance.GetILGenerator();
for (int j = 0; j < piLength; j++)
{
Type parameterType = pi[j].ParameterType;
if (parameterType == typeofInt8 ||
parameterType == typeofBoolean ||
parameterType == typeofUInt8 ||
parameterType == typeofInt16 ||
parameterType == typeofUInt16 ||
parameterType == typeofChar ||
parameterType == typeofInt32 ||
parameterType == typeofUInt32)
{
newInstanceGen.Emit(OpCodes.Ldc_I4_0);
}
else if (parameterType == typeofInt64 ||
parameterType == typeofUInt64)
{
newInstanceGen.Emit(OpCodes.Ldc_I8, (long)0);
}
else if (parameterType == typeofSingle)
{
newInstanceGen.Emit(OpCodes.Ldc_R4, (float)0);
}
else if (parameterType == typeofDouble)
{
newInstanceGen.Emit(OpCodes.Ldc_R8, (double)0);
}
else if (parameterType.IsValueType)
{
LocalBuilder v = newInstanceGen.DeclareLocal(parameterType);
newInstanceGen.Emit(OpCodes.Ldloca_S, v);
newInstanceGen.Emit(OpCodes.Initobj, parameterType);
newInstanceGen.Emit(OpCodes.Ldloc_S, v);
}
else
{
newInstanceGen.Emit(OpCodes.Ldnull);
}
}
newInstanceGen.Emit(OpCodes.Newobj, ctors[i]);
if (type.IsValueType)
{
newInstanceGen.Emit(OpCodes.Box, type);
}
newInstanceGen.Emit(OpCodes.Ret);
newInstanceDelegate = (NewInstanceDelegate)dynamicNewInstance.CreateDelegate(typeofNewInstanceDelegate);
newInstanceDelegate();
break;
}
catch (Exception e) {
Console.WriteLine(e);
newInstanceDelegate = null;
}
}
}
if (newInstanceDelegate == null)
{
throw new NotSupportedException();
}
}