private IEnumerable <IMetricDefinition> CreateMetricDefinitions(MetricConfigurationElement metric, string type)
{
switch (type)
{
case "performance-counter":
return(CreatePerformanceCounterMetricDefinition(metric, NormalizePerformanceCounterName));
case "iis-performance-counter":
//
// IIS performance counters are prefixed with "PID_", which
// we need to get rid of
return(CreatePerformanceCounterMetricDefinition(metric, NormalizeIisPerformanceCounterName));
case "wcf-performance-counter":
//
// WCF performance counters are prefixed with "ServiceName@" and contain
// pipe-delimited crap like Service@http:||foo:8080|bar
return(CreatePerformanceCounterMetricDefinition(metric, NormalizeWcfPerformanceCounterName));
case "number-of-files":
return(CreateNumberOfFilesDefinition(metric));
default:
throw new ArgumentOutOfRangeException("type");
}
}
private IEnumerable <IMetricDefinition> CreateNumberOfFilesDefinition(MetricConfigurationElement metric)
{
var path = metric.Path;
if (!Directory.Exists(path))
{
yield break;
}
yield return(new MetricDefinition(
metric.Name,
() => {
var numberOfFiles = new DirectoryInfo(path).EnumerateFiles("*.*", SearchOption.TopDirectoryOnly).Count();
return numberOfFiles;
}, metric.AggregationStrategy));
}
public IMetricSource CreateMetricSource(MetricConfigurationElement metric)
{
if (metric.Type == "rabbit-mq")
{
var metricSource = new RabbitMqMetricSource(metric);
return(metricSource);
} // if
if (metric.Type == "memcached")
{
var metricSource = new MemcachedMetricSource(metric);
return(metricSource);
} // if
var metricDefinitions = metricDefinitionFactory.CreateMetricDefinitions(metric);
if (metric.RefreshEvery.HasValue)
{
return(new RefreshableMetricSource(metricDefinitions, metric.RefreshEvery.Value, () => metricDefinitionFactory.CreateMetricDefinitions(metric)));
}
return(new MetricSource(metricDefinitions));
}
private IEnumerable <IMetricDefinition> CreatePerformanceCounterMetricDefinition(MetricConfigurationElement metric,
Func <string, string> metricNameProcessor)
{
return(ParsePerformanceCounters(metric.Path).Select(pc => {
var name = metric.Name;
if (!string.IsNullOrWhiteSpace(pc.Item1) && name.Contains("**"))
{
var fragment = MetricNameBuilder.SanitizeMetricName(metricNameProcessor(pc.Item1)).ToLowerInvariant();
fragment = fragment.Trim('_');
while (fragment.Contains("__"))
{
fragment = fragment.Replace("__", "_");
}
name = name.Replace("**", fragment);
} // if
var metricDefinition = new PerformanceCounterMetricDefinition(name, () => pc.Item2.NextValue(), metric.AggregationStrategy);
return metricDefinition;
}));
}
public IEnumerable <IMetricDefinition> CreateMetricDefinitions(MetricConfigurationElement metric)
{
var type = metric.Type.ToLowerInvariant();
return(CreateMetricDefinitions(metric, type));
}