// perhaps something like this
// e.g. FormulaValueSource would have all the formulas
//public ExecutionEngine AddValueSource(IValueSource valueSource)
//{
//}
public ExecutionContext Execute(Guid formulaId, IEnumerable <ArgumentValue> argumentValues, IContextLogger logger)
{
Guard.AgainstNull(argumentValues, nameof(argumentValues));
Guard.AgainstNull(logger, nameof(logger));
Initialize();
var context = new ExecutionContext(argumentValues, logger);
foreach (var argumentValue in argumentValues)
{
var argument = GetArgument(argumentValue.Id);
if (logger.LogLevel == ContextLogLevel.Verbose)
{
logger.LogVerbose($"[inputParameter] {argumentValue.Id} / {argument.Name} = '{argumentValue.Value}'");
}
}
try
{
Execute(context, formulaId, logger);
}
catch (Exception ex)
{
context.WithException(ex);
}
return(context);
}
private FormulaContext Execute(ExecutionContext executionContext, Guid formulaId, IContextLogger logger)
{
var formula = GetFormula(formulaId);
executionContext.CyclicInvariant(formula.Name);
using (var formulaContext = executionContext.FormulaContext(formula.Name))
{
foreach (var constraint in formula.Constraints)
{
var argument = GetArgument(constraint.ArgumentId);
var argumentValue = executionContext.GetArgumentValue(constraint.ArgumentId);
if (!_valueComparer.IsSatisfiedBy(argument.DataType, argumentValue, constraint.Comparison,
constraint.Value))
{
if (logger.LogLevel == ContextLogLevel.Verbose)
{
logger.LogVerbose($"[disqualified] {argument.Name} is '{argumentValue}' and should {constraint.Comparison} '{constraint.Value}'");
}
return(formulaContext.Disqualified(
argument,
argumentValue,
constraint.Comparison,
constraint.Value));
}
}
foreach (var operation in formula.Operations)
{
decimal value = 0;
switch (operation.ValueProviderName.ToLower())
{
case "decimal":
{
value = Convert.ToDecimal(operation.InputParameter);
break;
}
case "argument":
{
value = Convert.ToDecimal(executionContext.GetArgumentValue(new Guid(operation.InputParameter)));
break;
}
case "matrix":
{
var matrix = GetMatrix(new Guid(operation.InputParameter));
value =
Convert.ToDecimal(matrix.GetValue(_valueComparer, executionContext,
GetArgument(matrix.RowArgumentId),
matrix.ColumnArgumentId.HasValue ? GetArgument(matrix.ColumnArgumentId.Value) : null));
break;
}
case "formula":
{
value = Execute(executionContext, new Guid(operation.InputParameter), logger).Result;
break;
}
case "result":
{
value = formulaContext.Result;
break;
}
}
if (logger.LogLevel == ContextLogLevel.Verbose)
{
logger.LogVerbose($"[operation] {formulaContext.Result} {operation.GetOperator()} {value}");
}
operation.Perform(formulaContext, value);
}
return(formulaContext);
}
}