public override object Evaluate(Environment environment, EvalContext context)
{
var from = context.From;
var until = context.Until;
var metricNames = environment.MetricRegistry.ResolveMetricNames(Expression.Selector);
var metrics = MetricReader.ReadMetrics(environment, metricNames, from, until);
return(metrics.ToArray());
}
public object Invoke(Environment environment, EvalContext context, object[] parameters)
{
var p = new List <object> {
context
};
var pis = methodInfo.GetParameters();
var paramsPi = pis.SingleOrDefault(pi => pi.GetCustomAttributes(typeof(ParamArrayAttribute), false).OfType <ParamArrayAttribute>().SingleOrDefault() != null);
var hasParams = paramsPi != null;
var hasMetric = pis.All(pi => pi.ParameterType != typeof(MetricSelector));
//
// First parameter must always be an EvalContext instance
if (hasParams)
{
p.AddRange(parameters.Take(pis.Length - 2));
var @params = parameters.Skip(pis.Length - 2).ToArray();
var par = Array.CreateInstance(paramsPi.ParameterType.GetElementType(), @params.Length);
Array.Copy(@params, par, @params.Length);
p.Add(par);
} // if
else
{
p.AddRange(parameters);
}
if (hasMetric)
{
var pos = p.FindIndex(_p => _p is MetricSelector);
if (pos > -1)
{
var ms = p[pos] as MetricSelector;
var metricNames = environment.MetricRegistry.ResolveMetricNames(ms.Selector);
var metrics = MetricReader.ReadMetrics(environment, metricNames, context.From, context.Until);
p[pos] = metrics.ToArray();
} // if
} // if
return(methodInfo.Invoke(null, p.ToArray()));
}