public void MultiSubscriber()
{
var subscriber1Result = new List<KeyValuePair<string, object>>();
Predicate<string> subscriber1Predicate = telemetryName => (telemetryName == "DataForSubscriber1");
var subscriber1Oberserver = new ObserverToList<TelemData>(subscriber1Result);
var subscriber2Result = new List<KeyValuePair<string, object>>();
Predicate<string> subscriber2Predicate = telemetryName => (telemetryName == "DataForSubscriber2");
var subscriber2Oberserver = new ObserverToList<TelemData>(subscriber2Result);
// Get two subscribers going.
using (var subscription1 = TelemetryListener.DefaultListener.Subscribe(subscriber1Oberserver, subscriber1Predicate))
{
using (var subscription2 = TelemetryListener.DefaultListener.Subscribe(subscriber2Oberserver, subscriber2Predicate))
{
// Things that neither subscribe to get filtered out.
if (TelemetryListener.DefaultListener.IsEnabled("DataToFilterOut"))
TelemetryListener.DefaultListener.WriteTelemetry("DataToFilterOut", -1);
Assert.Equal(0, subscriber1Result.Count);
Assert.Equal(0, subscriber2Result.Count);
/****************************************************/
// If a Source does not use the IsEnabled, then every subscriber gets it.
subscriber1Result.Clear();
subscriber2Result.Clear();
TelemetryListener.DefaultListener.WriteTelemetry("UnfilteredData", 3);
Assert.Equal(1, subscriber1Result.Count);
Assert.Equal("UnfilteredData", subscriber1Result[0].Key);
Assert.Equal(3, (int)subscriber1Result[0].Value);
Assert.Equal(1, subscriber2Result.Count);
Assert.Equal("UnfilteredData", subscriber2Result[0].Key);
Assert.Equal(3, (int)subscriber2Result[0].Value);
/****************************************************/
// Filters not filter out everything, they are just a performance optimization.
// Here you actually get more than you want even though you use a filter
subscriber1Result.Clear();
subscriber2Result.Clear();
if (TelemetryListener.DefaultListener.IsEnabled("DataForSubscriber1"))
TelemetryListener.DefaultListener.WriteTelemetry("DataForSubscriber1", 1);
Assert.Equal(1, subscriber1Result.Count);
Assert.Equal("DataForSubscriber1", subscriber1Result[0].Key);
Assert.Equal(1, (int)subscriber1Result[0].Value);
// Subscriber 2 happens to get it
Assert.Equal(1, subscriber2Result.Count);
Assert.Equal("DataForSubscriber1", subscriber2Result[0].Key);
Assert.Equal(1, (int)subscriber2Result[0].Value);
/****************************************************/
subscriber1Result.Clear();
subscriber2Result.Clear();
if (TelemetryListener.DefaultListener.IsEnabled("DataForSubscriber2"))
TelemetryListener.DefaultListener.WriteTelemetry("DataForSubscriber2", 2);
// Subscriber 1 happens to get it
Assert.Equal(1, subscriber1Result.Count);
Assert.Equal("DataForSubscriber2", subscriber1Result[0].Key);
Assert.Equal(2, (int)subscriber1Result[0].Value);
Assert.Equal(1, subscriber2Result.Count);
Assert.Equal("DataForSubscriber2", subscriber2Result[0].Key);
Assert.Equal(2, (int)subscriber2Result[0].Value);
} // subscriber2 drops out
/*********************************************************************/
/* Only Subscriber 1 is left */
/*********************************************************************/
// Things that neither subscribe to get filtered out.
subscriber1Result.Clear();
subscriber2Result.Clear();
if (TelemetryListener.DefaultListener.IsEnabled("DataToFilterOut"))
TelemetryListener.DefaultListener.WriteTelemetry("DataToFilterOut", -1);
Assert.Equal(0, subscriber1Result.Count);
Assert.Equal(0, subscriber2Result.Count);
/****************************************************/
// If a Source does not use the IsEnabled, then every subscriber gets it.
subscriber1Result.Clear();
TelemetryListener.DefaultListener.WriteTelemetry("UnfilteredData", 3);
Assert.Equal(1, subscriber1Result.Count);
Assert.Equal("UnfilteredData", subscriber1Result[0].Key);
Assert.Equal(3, (int)subscriber1Result[0].Value);
// Subscriber 2 has dropped out.
Assert.Equal(0, subscriber2Result.Count);
/****************************************************/
// Filters not filter out everything, they are just a performance optimization.
// Here you actually get more than you want even though you use a filter
subscriber1Result.Clear();
if (TelemetryListener.DefaultListener.IsEnabled("DataForSubscriber1"))
TelemetryListener.DefaultListener.WriteTelemetry("DataForSubscriber1", 1);
Assert.Equal(1, subscriber1Result.Count);
Assert.Equal("DataForSubscriber1", subscriber1Result[0].Key);
Assert.Equal(1, (int)subscriber1Result[0].Value);
// Subscriber 2 has dropped out.
Assert.Equal(0, subscriber2Result.Count);
/****************************************************/
subscriber1Result.Clear();
if (TelemetryListener.DefaultListener.IsEnabled("DataForSubscriber2"))
TelemetryListener.DefaultListener.WriteTelemetry("DataForSubscriber2", 2);
// Subscriber 1 filters
Assert.Equal(0, subscriber1Result.Count);
// Subscriber 2 has dropped out
Assert.Equal(0, subscriber2Result.Count);
} // subscriber1 drops out
/*********************************************************************/
/* No Subscribers are left */
/*********************************************************************/
// Things that neither subscribe to get filtered out.
subscriber1Result.Clear();
subscriber2Result.Clear();
if (TelemetryListener.DefaultListener.IsEnabled("DataToFilterOut"))
TelemetryListener.DefaultListener.WriteTelemetry("DataToFilterOut", -1);
Assert.Equal(0, subscriber1Result.Count);
Assert.Equal(0, subscriber2Result.Count);
/****************************************************/
// If a Source does not use the IsEnabled, then every subscriber gets it.
TelemetryListener.DefaultListener.WriteTelemetry("UnfilteredData", 3);
// No one subscribing
Assert.Equal(0, subscriber1Result.Count);
Assert.Equal(0, subscriber2Result.Count);
/****************************************************/
// Filters not filter out everything, they are just a performance optimization.
// Here you actually get more than you want even though you use a filter
if (TelemetryListener.DefaultListener.IsEnabled("DataForSubscriber1"))
TelemetryListener.DefaultListener.WriteTelemetry("DataForSubscriber1", 1);
// No one subscribing
Assert.Equal(0, subscriber1Result.Count);
Assert.Equal(0, subscriber2Result.Count);
/****************************************************/
if (TelemetryListener.DefaultListener.IsEnabled("DataForSubscriber2"))
TelemetryListener.DefaultListener.WriteTelemetry("DataForSubscriber2", 2);
// No one subscribing
Assert.Equal(0, subscriber1Result.Count);
Assert.Equal(0, subscriber2Result.Count);
}