Single controller 2 views RSS

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  mbhahn

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  Single controller 2 views

  Mar 23, 2012 04:40 PM|LINK

  I have a single controller and I want the data from my datacontext class that is pulling twitter data copied into 2 views

  But i cant afford to do 2 actions where it hits the datacontext to perform 2 queries. 

  if I added a 2nd view to the controller i would have the problem above

  my datacontext performs a querry to a list  I was thinking something along the lines below where i take the one object and point it to another but that isnt good.  I am also not sure if this is a c# question more then a mvc so i appologize.

       var tweetShouts = new TweetMentions(auth);
              var mentionTweets = tweetShouts.GetMentions();
             // var Ticker = tweetShouts.GetMentions();
   
   
   
   
              return PartialView(mentionTweets);// && PartialView(Ticker);

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  CodeHobo

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  Re: Single controller 2 views

  Mar 23, 2012 05:06 PM|LINK

  Pull the data once and cache it. In the second action check the cache first, if it's there then no need to hit twitter and just use local data. If it's not pull the data from twitter and place it in the cache. You will have to tweak the expiration to make sure you get fresh data at regular intervals.

  Hattan Shobokshi
  Blog | Twitter : @Hattan
  
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  mbhahn

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  Re: Single controller 2 views

  Mar 23, 2012 05:23 PM|LINK

  So i need to build a 3rd layer that calls my datacontext that performs the query and caches

  so my view can call the cache layer and i can use it anywhere i want to?

  Do you recommend any simple solutions

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  CodeHobo

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  Re: Single controller 2 views

  Mar 23, 2012 05:26 PM|LINK

  mbhahn

  So i need to build a 3rd layer that calls my datacontext that performs the query and caches

  so my view can call the cache layer and i can use it anywhere i want to?

  Do you recommend any simple solutions

  Your view wouldn't call the cache layer, the controller action method would before dispatching the data to the view.

  The easiest thing would be to wrap your data context in a repository and implement something like that cached repository pattern
  http://ardalis.com/introducing-the-cachedrepository-pattern 

  Hattan Shobokshi
  Blog | Twitter : @Hattan
  
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  mbhahn

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  Re: Single controller 2 views

  Mar 23, 2012 05:52 PM|LINK

  yea i seen that example i  am not doing IoC for this 1 page app and i tried with unity i got lost when i had to put my query together

  This is my class

    public class TweetMentions
      {
          private readonly SingleUserAuthorizer _auth;
          public TweetMentions(SingleUserAuthorizer auth)
          {
            _auth = auth;
          }
          public List<TweetViewModel> GetMentions()
          {
              using (var twitterCtx = new TwitterContext(_auth))
              {
                  var newMentions = (from tweets in twitterCtx.Status
                                     where tweets.Type == StatusType.Mentions
                                     select new TweetViewModel
                                     {
                                         ImageUrl = tweets.User.ProfileImageUrl,
                                         ScreenName = tweets.User.Identifier.ScreenName,
                                         Tweet = HomeController.AddWebAndTwitterLinks(tweets.Text),
                                         TweetTime = tweets.CreatedAt
                                     }).ToList();
   
   
   
   
                  return newMentions.ToList();
              }
          }
   
      }
  
  
  This is the Cache class
  
  

  public class CachedAlbumRepository : EfAlbumRepository

  {

      private static readonly object CacheLockObject = new object();

      public override IEnumerable<Album> GetTopSellingAlbums(int count)

      {

          Debug.Print("CachedAlbumRepository:GetTopSellingAlbums");

          string cacheKey = "TopSellingAlbums-" + count;

          var result = HttpRuntime.Cache[cacheKey] as List<Album>;

          if (result == null)

          {

              lock (CacheLockObject)

              {

                  result = HttpRuntime.Cache[cacheKey] as List<Album>;

                  if (result == null)

                  {

                      result = base.GetTopSellingAlbums(count).ToList();

                      HttpRuntime.Cache.Insert(cacheKey, result, null, 

                          DateTime.Now.AddSeconds(60), TimeSpan.Zero);

                  }

              }

          }

          return result;

      }

  }
  
  I would need to do something like this???
  
  

  public class TwitterMentionRepository : TweetMentions

  {

      private static readonly object CacheLockObject = new object();

      public override public List<TweetViewModel> GetMentions()

      {

          Debug.Print("CachedAlbumRepository:GetTopSellingAlbums");

          string cacheKey = "TweetMentions" + ??;

          var result = HttpRuntime.Cache[cacheKey] as List<TweetViewModel>;

          if (result == null)

          {

              lock (CacheLockObject)

              {

                  result = HttpRuntime.Cache[cacheKey] as List<TweetViewModel>;

                  if (result == null)

                  {

                      result = base.Tweetmentions.ToList();

                      HttpRuntime.Cache.Insert(cacheKey, result, null, 

                          DateTime.Now.AddSeconds(60), TimeSpan.Zero);

                  }

              }

          }

          return result;

      }

  }

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  CodeHobo

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  Re: Single controller 2 views

  Mar 23, 2012 06:01 PM|LINK

  You don't need to use and IoC container , but you do need to inject the dependencies. You can do that manually though through overloaded constructors.

  The class look good, I would just remove the debug and change the key to be a plain string.

  string cacheKey = "TweetMentions";

   

  Hattan Shobokshi
  Blog | Twitter : @Hattan
  
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  mbhahn

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  119 Posts

  Re: Single controller 2 views

  Mar 23, 2012 07:25 PM|LINK

  Im failing at something miserably, while i am inheriting the class I am not doing something fundamentally correct

  plus the override and  base isnt working/wiring together

    public class MentionCacheLayer : TweetMentions
      {
          private static readonly object CacheLockObject = new object();
   
          public override List<TweetViewModel> GetMentions()
          {
   
              Debug.Print("CachedMentionRepository:GetMentions");
   
              string cacheKey = "TwitterMentions";
   
              var result = HttpRuntime.Cache[cacheKey] as List<TweetViewModel>;
   
   
              if (result == null)
              {
   
                  lock (CacheLockObject)
                  {
   
                      result = HttpRuntime.Cache[cacheKey] as List<TweetViewModel>;
   
                      if (result == null)
                      {
   
                          result = base.GetMentions; <<< Not working
   
   
                          HttpRuntime.Cache.Insert(cacheKey, result, null,
   
                              DateTime.Now.AddSeconds(60), TimeSpan.Zero);
   
                      }
   
                  }
              }
              return result;
   
   
          }
      } 

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  mbhahn

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  119 Posts

  Re: Single controller 2 views

  Mar 23, 2012 07:29 PM|LINK

  i marked the base class virtual and no errors im gonna see if it works not sure if i am passing it in correctly or not.

  Error Error    3    'myMvcTwitterSearch.DataContext.TweetMentions' does not contain a constructor that takes 0 arguments    C:\Users\Mike\documents\visual studio 2010\Projects\myMvcTwitterSearch\myMvcTwitterSearch\DataContext\MentionCacheLayer.cs    12    18    myMvcTwitterSearch
  
  i added this

     public MentionCacheLayer() : base (auth)
   
          {
          //    _auth = _auth;
           }
  
  but i cant get mybase auth to work since the base class had that

  • Edited by mbhahn on Mar 23, 2012 07:34 PM
  • Edited by mbhahn on Mar 23, 2012 08:11 PM