Select Test Variation & Sitecore Analytics Visitor Tags

using System;

using HA.ApplicationLogic.Session;

using HA.Web.Analytics.Tracking;

using HA.Web.Analytics.Tracking.Base;

using HA.Web.Analytics.Tracking.Enums;

using HA.Web.Analytics.Tracking.Models;

using Sitecore.Analytics.Data.Items;

using Sitecore.Analytics.Testing;

using Sitecore.Diagnostics;

using Sitecore.Mvc.Analytics.Pipelines.Response.CustomizeRendering;

namespace HA.Web.Analytics.Pipelines

{

    public class SelectTestVariation : SelectVariation

    {

        protected override void ApplyVariation(CustomizeRenderingArgs args, ComponentTestContext context)

        {

            try

            {

                //determine if there's a multivariate test currently running on this page

                AbstractTrackerBase tracker = TrackerFactory.GetTracker();

                TestDefinitionItem runningTest;

                tracker.TryGetTest(out runningTest);

                if (runningTest == null)

                    return;

                //read visitor test tag and compare to a running test

                TestDefinitionItem recordedVisitorTest;

                tracker.TryGetRunningVisitorTest(out recordedVisitorTest);

                if (recordedVisitorTest != null)

                {

                    //if recorded Contact/Visitor test is the same as the test currently running - proceed with a test

                    if (recordedVisitorTest.ID == runningTest.ID)

                    {

                        //proceed with test

                    }

                    else

                    {

                        tracker.CancelTests();

                        return;

                    }

                }

                //check session

                TestDefinitionItem recordedSessionTest;

                tracker.TryGetRunningSessionTest(out recordedSessionTest);

                if(recordedSessionTest != null)

                {

                    //if recorded Session test is the same as the test currently running - proceed with a test

                    if (recordedSessionTest.ID == runningTest.ID)

                    {

                        //proceed with test

                    }

                    else

                    {

                        tracker.CancelTests();

                        return;

                    }

                }

                //persist the test only if it's not in Contact Tag or in Session

                if (tracker.GetTestExposureStrategy() == ExposureStrategy.OncePerContact &&

                    recordedVisitorTest == null)

                {

                    VisitorTag tag = new VisitorTag(tracker.GetVisitorTagName(), runningTest.ID.ToString());

                    tracker.SetVisitorTag(tag);

                }

                else if (tracker.GetTestExposureStrategy() == ExposureStrategy.OncePerSession && recordedSessionTest == null)

                {

                    SessionManager.Instance.MultivariateTestPage = runningTest.ID.ToString();

                }

                //run the test

                base.ApplyVariation(args, context);

            }

            catch (Exception ex)

            {

                Log.Error("Could not apply A/B test variation", ex, this);

            }

        }

    }

}