public Expression PrepareExpression(IQbservableProtocol protocol)
{
Contract.Requires(protocol != null);
Contract.Ensures(Contract.Result <Expression>() != null);
Log.ClientSendingExpression(clientId, Expression);
if (!Expression.Type.GetIsGenericType() ||
(Expression.Type.GetGenericTypeDefinition() != typeof(IQbservable <>) &&
Expression.Type.GetGenericTypeDefinition() != typeof(ClientQuery <>)))
{
throw new InvalidOperationException("The query must end as an IQbservable<T>.");
}
var visitor = ReplaceConstantsVisitor.CreateForGenericTypeByDefinition(
typeof(ClientQuery <>),
#if REFLECTION
(_, actualType) => Activator.CreateInstance(typeof(QbservableSourcePlaceholder <>).MakeGenericType(actualType.GetGenericArguments()[0]), true),
#else
(_, actualType) => Activator.CreateInstance(typeof(QbservableSourcePlaceholder <>).MakeGenericType(actualType.GetGenericArguments()[0])),
#endif
type => typeof(IQbservable <>).MakeGenericType(type.GetGenericArguments()[0]));
var result = visitor.Visit(Expression);
if (visitor.ReplacedConstants == 0)
{
throw new InvalidOperationException("A queryable observable service was not found in the query.");
}
var evaluator = Provider.ClientEvaluator;
if (!evaluator.IsKnownType(Provider.SourceType))
{
evaluator.AddKnownType(Provider.SourceType);
}
var evaluationVisitor = new LocalEvaluationVisitor(evaluator, protocol);
var preparedExpression = evaluationVisitor.Visit(result);
Contract.Assume(!evaluationVisitor.HasAnyExpectedTypes);
Log.ClientRewrittenExpression(clientId, preparedExpression);
return(preparedExpression);
}
public Expression PrepareExpression(QbservableProtocol protocol)
{
QbservableProviderDiagnostics.DebugPrint(Expression, "TcpClientQuery Original Expression");
if (!Expression.Type.IsGenericType ||
(Expression.Type.GetGenericTypeDefinition() != typeof(IQbservable <>) &&
Expression.Type.GetGenericTypeDefinition() != typeof(TcpClientQuery <>)))
{
throw new InvalidOperationException("The query must end as an IQbservable<T>.");
}
var visitor = ReplaceConstantsVisitor.CreateForGenericTypeByDefinition(
typeof(TcpClientQuery <>),
(_, actualType) => Activator.CreateInstance(typeof(QbservableSourcePlaceholder <>).MakeGenericType(actualType.GetGenericArguments()[0]), true),
type => typeof(IQbservable <>).MakeGenericType(type.GetGenericArguments()[0]));
var result = visitor.Visit(Expression);
if (visitor.ReplacedConstants == 0)
{
throw new InvalidOperationException("A queryable observable service was not found in the query.");
}
var evaluator = Provider.LocalEvaluator;
if (!evaluator.IsKnownType(Provider.SourceType))
{
evaluator.AddKnownType(Provider.SourceType);
}
var evaluationVisitor = new LocalEvaluationVisitor(evaluator, protocol);
var preparedExpression = evaluationVisitor.Visit(result);
QbservableProviderDiagnostics.DebugPrint(preparedExpression, "TcpClientQuery Rewritten Expression");
return(preparedExpression);
}