/// <summary>
/// Method to retrieve and cache product name by its ID
/// </summary>
/// <param name="productId">Product id</param>
/// <returns>Product name</returns>
public static string GetProductName(string productId)
{
Product product = new Product();
if (!enableCaching)
return product.GetProduct(productId).Name;
string cacheKey = string.Format(PRODUCT_NAME_KEY, productId);
// Check if the data exists in the data cache
string data = (string)HttpRuntime.Cache[cacheKey];
if (data == null) {
// Caching duration from Web.config
int cacheDuration = int.Parse(ConfigurationManager.AppSettings["ProductCacheDuration"]);
// If the data is not in the cache then fetch the data from the business logic tier
data = product.GetProduct(productId).Name;
// Create a AggregateCacheDependency object from the factory
AggregateCacheDependency cd = DependencyFacade.GetProductDependency();
// Store the output in the data cache, and Add the necessary AggregateCacheDependency object
HttpRuntime.Cache.Add(cacheKey, data, cd, DateTime.Now.AddHours(cacheDuration), Cache.NoSlidingExpiration, CacheItemPriority.High, null);
}
return data;
}
/// <summary>
/// This method acts as a proxy between the web and business components to check whether the
/// underlying data has already been cached.
/// </summary>
/// <param name="category">Category</param>
/// <returns>List of ProductInfo from Cache or Business component</returns>
public static IList<ProductInfo> GetProductsByCategory(string category)
{
Product product = new Product();
if (!enableCaching)
return product.GetProductsByCategory(category);
string key = "product_by_category_" + category;
IList<ProductInfo> data = (IList<ProductInfo>)HttpRuntime.Cache[key];
// Check if the data exists in the data cache
if (data == null) {
// If the data is not in the cache then fetch the data from the business logic tier
data = product.GetProductsByCategory(category);
// Create a AggregateCacheDependency object from the factory
AggregateCacheDependency cd = DependencyFacade.GetProductDependency();
// Store the output in the data cache, and Add the necessary AggregateCacheDependency object
HttpRuntime.Cache.Add(key, data, cd, DateTime.Now.AddHours(productTimeout), Cache.NoSlidingExpiration, CacheItemPriority.High, null);
}
return data;
}
public Product[] GetProducts()
{
var categorySvc = new bll.Category();
var categories = categorySvc.GetCategories().Select(x => x.Id);
var products = new List <Product>();
var productSvc = new bll.Product();
foreach (var category in categories)
{
var productInfos = productSvc.GetProductsByCategory(category);
products.AddRange(productInfos.Select(x =>
{
return(new Product
{
ProductId = x.Id,
CategoryId = x.CategoryId,
Description = x.Description,
ImageUrl = x.Image,
Name = x.Name
});
}));
}
return(products.ToArray());
}
protected void PageChanged(object sender, DataGridPageChangedEventArgs e)
{
products.CurrentPageIndex = e.NewPageIndex;
// Get the search terms from the query string
string searchKey = WebComponents.CleanString.InputText(Request["keywords"], 100);
if (searchKey != ""){
// Create a data cache key
string cacheKey = "search" + searchKey;
// Check if the objects are in the cache
if(Cache[cacheKey] != null){
products.DataSource = (IList)Cache[cacheKey];
}else{
// If that data is not in the cache then use the business logic tier to fetch the data
Product product = new Product();
IList productsBySearch = product.GetProductsBySearch(searchKey);
// Store the results in a cache
Cache.Add(cacheKey, productsBySearch, null, DateTime.Now.AddHours(12), Cache.NoSlidingExpiration , CacheItemPriority.High, null);
products.DataSource = productsBySearch;
}
// Databind the data to the controls
products.DataBind();
}
}
protected void PageChanged(object sender, DataGridPageChangedEventArgs e)
{
products.CurrentPageIndex = e.NewPageIndex;
// Get the category from the query string
// string categoryKey = Request["categoryId"];
string categoryKey = WebComponents.CleanString.InputText(Request["categoryId"], 50);
// Check to see if the contents are in the Data Cache
if(Cache[categoryKey] != null){
// If the data is already cached, then used the cached copy
products.DataSource = (IList)Cache[categoryKey];
}else{
// If the data is not cached, then create a new products object and request the data
Product product = new Product();
IList productsByCategory = product.GetProductsByCategory(categoryKey);
// Store the results of the call in the Cache and set the time out to 12 hours
Cache.Add(categoryKey, productsByCategory, null, DateTime.Now.AddHours(12), Cache.NoSlidingExpiration , CacheItemPriority.High, null);
products.DataSource = productsByCategory;
}
// Bind the data to the control
products.DataBind();
// Set the label to be the query parameter
lblPage.Text = categoryKey;
}
/// <summary>
/// Rebind control
/// </summary>
protected void PageChanged(object sender, DataGridPageChangedEventArgs e)
{
//reset index
searchList.CurrentPageIndex = e.NewPageIndex;
//get category id
string keywordKey = Request.QueryString["keywords"];
//bind data
Product product = new Product();
searchList.DataSource = product.GetProductsBySearch(keywordKey);
searchList.DataBind();
}
/// <summary>
/// Rebind control
/// </summary>
protected void PageChanged(object sender, DataGridPageChangedEventArgs e)
{
//reset index
productsList.CurrentPageIndex = e.NewPageIndex;
//get category id
string categoryKey = Request.QueryString["categoryId"];
//bind data
Product product = new Product();
productsList.DataSource = product.GetProductsByCategory(categoryKey);
productsList.DataBind();
}
public Product GetProductById(string productId)
{
var svc = new bll.Product();
var productInfo = svc.GetProduct(productId);
return(new Product
{
ProductId = productInfo.Id,
CategoryId = productInfo.CategoryId,
Description = productInfo.Description,
ImageUrl = productInfo.Image,
Name = productInfo.Name
});
}
/// <summary>
/// Function called the user is trying to go
/// forward or backwards through the favourites list
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void FavoritesPageChanged(object sender, DataGridPageChangedEventArgs e)
{
//Update the current page count
favorites.CurrentPageIndex = e.NewPageIndex;
//Retrieve the list of favourites from Cache using the category name stored in viewstate
if(Cache[(string)ViewState[KEY_CATEGORY]] != null){
favorites.DataSource = (IList)Cache[(string)ViewState[KEY_CATEGORY]];
}else{
//If there is nothing in viewstate, then fetch the favourites from the middle tier
Product product = new Product();
IList productsByCategory = product.GetProductsByCategory((string)ViewState[KEY_CATEGORY]);
//Store the results in the cache
Cache.Add((string)ViewState[KEY_CATEGORY], productsByCategory, null, DateTime.Now.AddHours(12), Cache.NoSlidingExpiration , CacheItemPriority.High, null);
favorites.DataSource = productsByCategory;
}
//Rebind the favourites list data to the control
favorites.DataBind();
}
