Samples/Castle/PetStore.Service/DefaultRecommendationService.cs

   1 // Copyright 2004-2008 Castle Project - http://www.castleproject.org/
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 namespace PetStore.Service
  16 {
  17         using System;
  18
  19         using PetStore.Model;
  20
  21         /// <summary>
  22         /// A clever recommendation service should use some
  23         /// branch of AI to suggest meaningfull products
  24         /// (think adaptive resonance theory / http://jroller.com/page/hammett?entry=finally_something_interesting_on_my)
  25         /// based on the history of the customer (if available).
  26         /// But we just pick up some random products
  27         /// </summary>
  28         public class DefaultRecommendationService : IRecommendationService
  29         {
  30                 private readonly Random random;
  31                 private readonly IProductDataAccess productDataAccess;
  32
  33                 public DefaultRecommendationService(IProductDataAccess productDataAccess)
  34                 {
  35                         this.productDataAccess = productDataAccess;
  36                         this.random = new Random((int) DateTime.Now.Ticks);
  37                 }
  38
  39                 public Product[] GetProducts(Customer customer)
  40                 {
  41                         int[] ids = productDataAccess.GetProductIds();
  42
  43                         if (ids.Length == 0) return new Product[0];
  44
  45                         // We select two
  46
  47                         int firstIndex = random.Next(0, ids.Length - 1);
  48                         int secondIndex = random.Next(0, ids.Length - 1);
  49
  50                         if (firstIndex != secondIndex)
  51                         {
  52                                 return new Product[] {
  53                                                                                  Product.Find(ids[firstIndex]),
  54                                                                                  Product.Find(ids[secondIndex]) };
  55                         }
  56                         else
  57                         {
  58                                 return new Product[] { Product.Find(ids[firstIndex]) };
  59                         }
  60                 }
  61         }
  62 }