public decimal Manage(string expression)
{
if (_cacheManager.Exist(expression))
{
return(_cacheManager.Get(expression));
}
if (!_validator.Validate(expression))
{
throw new InvalidOperationException("Expression is invalid");
}
var formedExpression = _formater.Format(expression);
var result = _calculatorEngine.Calculate(formedExpression);
_cacheManager.Insert(expression, result);
return(result);
}