Taijutsu.Data.Internal.DataContextSupervisor.Register C# (CSharp) Method

        public virtual IDataContext Register([NotNull] UnitOfWorkConfig config)
        {
            DataSource dataSource;

            if (!dataSourcesProvider().TryGetValue(config.SourceName, out dataSource))
            {
                if (config.SourceName == string.Empty)
                {
                    throw new Exception("Default data source is not registered.");
                }

                throw new Exception(string.Format("Data source with name '{0}' is not registered.", config.SourceName));
            }

            config = new UnitOfWorkConfig(
                config.SourceName, 
                config.IsolationLevel == IsolationLevel.Unspecified ? dataSource.DefaultIsolationLevel : config.IsolationLevel, 
                config.Require);

            if (config.Require == Require.New)
            {
                return new DataContextDecorator(
                    new DataContext(config, new Lazy<IDataSession>(() => dataSource.BuildSession(config.IsolationLevel), false), terminationPolicy), 
                    contexts);
            }

            // ReSharper disable once ImplicitlyCapturedClosure
            var context = (from ctx in contexts where ctx.WrappedContext.Configuration.SourceName == config.SourceName select ctx).LastOrDefault();

            if (context != null)
            {
                if (!context.WrappedContext.Configuration.IsolationLevel.IsCompatible(config.IsolationLevel))
                {
                    throw new Exception(
                        string.Format("Isolation level '{0}' is not compatible with '{1}'.", context.WrappedContext.Configuration.IsolationLevel, config.IsolationLevel));
                }

                return new DataContext.Subordinate(context.WrappedContext);
            }

            if (config.Require == Require.Existing)
            {
                throw new Exception("Unit of work requires existing unit of work at the top level, but nothing has been found.");
            }

            context = new DataContextDecorator(
                new DataContext(config, new Lazy<IDataSession>(() => dataSource.BuildSession(config.IsolationLevel), false), terminationPolicy), 
                contexts);

            return context;
        }