public static Object CreateDynamic(String assemblyName, String className, SqlDBCredentials credentials, bool checkDeclarations = false, SoftwareVersion version = null, Type defaultDSType = null, bool readOnly = false)
{
/** make a copy of these */
credentials = credentials.Clone();
/** ensure version is valid */
if (version == null)
{
version = new SoftwareVersion();
}
InternalDatabaseType databaseType = InternalDatabaseType.Unknown;
Object retVal = null;
try
{
_instanceLock.Lock();
SoftwareVersion initialVersion = version;
Assembly asm = null;
Type t = null;
try
{
asm = Assembly.LoadFrom(assemblyName);
t = asm.GetType(className);
}
catch (Exception e)
{
throw new DataSourceException("DataSource Factory unable to load Datasource from Assembly: {0} - {1}", assemblyName, e);
}
_InstanceLookup.GetByType(t, credentials, version);
// No cached instance of the proper datasource for these credentials about. Try and find one.
if (retVal == null)
{
// Now we get the database version from the lookup or database
if (version == SoftwareVersion.Empty && !(GetDatabaseVersion(credentials, out version, out databaseType).ResultCode == DBResult.Result.Success))
{
throw new DataSourceException("DataSource Factory unable to obtain version from Database: {0} (2)", credentials.Host);
}
//1. Get specified version of T. Routine will Start at T and look at descendants, caching results.
Type type = _TypeLookup.GetByType(t, version);
//1a. Throw exception if T has no version decorations
if (type == null)
{
if (defaultDSType == null)
{
throw new DataSourceException("Unable to find version {0} of DataSource {1}", version, t);
}
else
{
type = defaultDSType;
}
}
bool saveDeclarationCheck = false;
/** save global declaration check flag */
if (type.IsSubclassOf(typeof(DataSourceBase)))
{
saveDeclarationCheck = DataSourceBase.CheckDeclarations;
DataSourceBase.CheckDeclarations = checkDeclarations;
}
/** Create instance with proper parameters */
retVal = Activator.CreateInstance(type, credentials);
_InstanceLookup.SetByType(t, credentials, version, retVal);
if (initialVersion != version)
{
_InstanceLookup.SetByType(t, credentials, initialVersion, retVal);
}
/** restore global declaration check flag */
if (type.IsSubclassOf(typeof(DataSourceBase)))
{
DataSourceBase.CheckDeclarations = saveDeclarationCheck;
}
if (retVal is DataSourceBase)
{
((DataSourceBase)(Object)retVal).ReadOnly = readOnly;
((DataSourceBase)(Object)retVal).DatabaseType = databaseType;
}
}
}
catch (Exception e)
{
Log.SysLogText(LogLevel.ERROR, "DataSourceFactory Exception: {0}", e.Message);
if (e.InnerException != null)
{
Log.SysLogText(LogLevel.ERROR, " Inner Exception: {0}", e.InnerException.Message);
}
/** rethrow */
throw e;
}
finally
{
_instanceLock.Unlock();
}
return(retVal);
}