/// <summary>
/// Generate a batch class definition to be used as a Beat pipe.
/// Compile the definition, dynamically load the assembly containing it, and return the Type representing the
/// Beat pipe class.
/// </summary>
/// <typeparam name="TKey">The key type for both sides.</typeparam>
/// <typeparam name="TPayload">The payload type.</typeparam>
/// <returns>
/// A type that is defined to be a subtype of UnaryPipe<<typeparamref name="TKey"/>,<typeparamref name="TPayload"/>, <typeparamref name="TPayload"/>>.
/// </returns>
internal static Tuple <Type, string> Generate <TKey, TPayload>(BeatStreamable <TKey, TPayload> stream)
{
Contract.Requires(stream != null);
Contract.Ensures(Contract.Result <Tuple <Type, string> >() == null || typeof(UnaryPipe <TKey, TPayload, TPayload>).GetTypeInfo().IsAssignableFrom(Contract.Result <Tuple <Type, string> >().Item1));
#if CODEGEN_TIMING
Stopwatch sw = new Stopwatch();
sw.Start();
#endif
var template = new BeatTemplate(
string.Format("GeneratedBeat_{0}", BeatSequenceNumber++),
typeof(TKey), typeof(TPayload));
template.ActiveEventType = typeof(TPayload).GetTypeInfo().IsValueType ? template.TPayload : "Active_Event";
#region Key Comparer
var keyComparer = stream.Properties.KeyEqualityComparer.GetEqualsExpr();
template.keyComparer =
(left, right) =>
keyComparer.Inline(left, right);
#endregion
#region Payload Comparer
var payloadComparer = stream.Properties.PayloadEqualityComparer.GetEqualsExpr();
var newLambda = Extensions.TransformFunction <TKey, TPayload>(payloadComparer, "index");
template.payloadComparer = (left, right) => newLambda.Inline(left, right);
#endregion
return(template.Generate <TKey, TPayload>(typeof(IStreamable <,>)));
}
private UnaryPipe <TKey, TPayload, TPayload> GetPipe(IStreamObserver <TKey, TPayload> observer)
{
var lookupKey = CacheKey.Create(this.Properties.KeyEqualityComparer.GetEqualsExpr().ExpressionToCSharp(), this.Properties.PayloadEqualityComparer.GetEqualsExpr().ExpressionToCSharp());
var generatedPipeType = cachedPipes.GetOrAdd(lookupKey, key => BeatTemplate.Generate(this));
Func <PlanNode, IQueryObject, PlanNode> planNode = ((PlanNode p, IQueryObject o) => new BeatPlanNode(p, o, typeof(TKey), typeof(TPayload), this.Offset, this.Period, true, generatedPipeType.Item2));
var instance = Activator.CreateInstance(generatedPipeType.Item1, this, observer, planNode, this.Offset, this.Period);
var returnValue = (UnaryPipe <TKey, TPayload, TPayload>)instance;
return(returnValue);
}
protected override bool CanGenerateColumnar()
{
var typeOfTKey = typeof(TKey);
if (typeOfTKey.GetPartitionType() != null)
{
return(false);
}
// This operator can handle a pseudo-columnar payload type, e.g., string.
var lookupKey = CacheKey.Create(this.Properties.KeyEqualityComparer.GetEqualsExpr().ExpressionToCSharp(), this.Properties.PayloadEqualityComparer.GetEqualsExpr().ExpressionToCSharp());
var generatedPipeType = cachedPipes.GetOrAdd(lookupKey, key => BeatTemplate.Generate(this));
this.errorMessages = generatedPipeType.Item2;
return(generatedPipeType.Item1 != null);
}