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WebTelemetryInitializerBase.cs
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WebTelemetryInitializerBase.cs
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namespace Microsoft.ApplicationInsights.Web.Implementation
{
using System;
using System.Web;
using Microsoft.ApplicationInsights.Channel;
using Microsoft.ApplicationInsights.DataContracts;
using Microsoft.ApplicationInsights.Extensibility;
using Microsoft.ApplicationInsights.Extensibility.Implementation.Tracing;
/// <summary>
/// Base class for WebOperationTelemetryInitializers.
/// </summary>
public abstract class WebTelemetryInitializerBase : ITelemetryInitializer
{
internal WebTelemetryInitializerBase()
{
WebEventSource.Log.WebTelemetryInitializerLoaded(this.GetType().FullName);
}
/// <summary>
/// Base implementation of the initialization method.
/// </summary>
/// <param name="telemetry">Telemetry item to initialize.</param>
public void Initialize(ITelemetry telemetry)
{
try
{
var platformContext = this.ResolvePlatformContext();
if (platformContext == null)
{
WebEventSource.Log.WebTelemetryInitializerNotExecutedOnNullHttpContext();
return;
}
if (platformContext.GetRequest() == null)
{
return;
}
var requestTelemetry = platformContext.ReadOrCreateRequestTelemetryPrivate();
this.OnInitializeTelemetry(platformContext, requestTelemetry, telemetry);
}
catch (Exception exc)
{
WebEventSource.Log.WebTelemetryInitializerFailure(
this.GetType().FullName,
exc.ToInvariantString());
}
}
/// <summary>
/// Implements initialization logic.
/// </summary>
/// <param name="platformContext">Http context.</param>
/// <param name="requestTelemetry">Request telemetry object associated with the current request.</param>
/// <param name="telemetry">Telemetry item to initialize.</param>
protected abstract void OnInitializeTelemetry(
HttpContext platformContext,
RequestTelemetry requestTelemetry,
ITelemetry telemetry);
/// <summary>
/// Resolved web platform specific context.
/// </summary>
/// <returns>An instance of the context.</returns>
protected virtual HttpContext ResolvePlatformContext()
{
return HttpContext.Current;
}
}
}