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DiagnosticSourceListener.cs
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DiagnosticSourceListener.cs
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// <copyright file="DiagnosticSourceListener.cs" company="OpenTelemetry Authors">
// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// </copyright>
using System;
using System.Collections.Generic;
using System.Diagnostics;
using OpenTelemetry.Internal;
namespace OpenTelemetry.Instrumentation
{
internal class DiagnosticSourceListener : IObserver<KeyValuePair<string, object>>
{
private readonly ListenerHandler handler;
public DiagnosticSourceListener(ListenerHandler handler)
{
Guard.ThrowIfNull(handler);
this.handler = handler;
}
public void OnCompleted()
{
}
public void OnError(Exception error)
{
}
public void OnNext(KeyValuePair<string, object> value)
{
if (!this.handler.SupportsNullActivity && Activity.Current == null)
{
return;
}
try
{
if (value.Key.EndsWith("Start", StringComparison.Ordinal))
{
this.handler.OnStartActivity(Activity.Current, value.Value);
}
else if (value.Key.EndsWith("Stop", StringComparison.Ordinal))
{
this.handler.OnStopActivity(Activity.Current, value.Value);
}
else if (value.Key.EndsWith("Exception", StringComparison.Ordinal))
{
this.handler.OnException(Activity.Current, value.Value);
}
else
{
this.handler.OnCustom(value.Key, Activity.Current, value.Value);
}
}
catch (Exception ex)
{
InstrumentationEventSource.Log.UnknownErrorProcessingEvent(this.handler?.SourceName, value.Key, ex);
}
}
}
}