private void Service_SimilarityLookupCompleted(IAsyncResult result)
{
BooksFoundEvent foundEvent = new BooksFoundEvent();
TextSearchState requestState = (TextSearchState)result.AsyncState;
try
{
List<Book> books = new List<Book>();
books = BuildResponseList(requestState.Request, result);
//cache the search results, and the induvidual books
_similaritySearches[requestState.SearchText].AddRange(books);
AddBooks(books.ToArray());
//record the results
foundEvent.Results = _similaritySearches[requestState.SearchText];
foundEvent.Success = true;
}
catch (Exception)
{
foundEvent.Success = false;
foundEvent.FailureMessage = "No Results Found";
}
requestState.Callback.Invoke(requestState.SearchText, foundEvent);
}
public void FindBooksByKeyword(string searchText, BooksFoundEventHandler callback)
{
//check if the search has been cached, if it hasn't then call the web service
if (!_textSearches.ContainsKey(searchText))
{
IDictionary<string, string> requestParams = new Dictionary<string, String>();
requestParams["Service"] = "AWSECommerceService";
requestParams["Operation"] = "ItemSearch";
requestParams["Keywords"] = HttpUtility.UrlEncode(searchText);
requestParams["ResponseGroup"] = RESPONSE_GROUP;
requestParams["SearchIndex"] = SEARCH_INDEX;
requestParams["ItemPage"] = ITEM_PAGE;
requestParams["Version"] = SERVICE_VERSION;
requestParams["AssociateTag"] = Constants.MY_AWS_ASSOCIATE_TAG;
_textSearches.Add(searchText, new List<Book>());
WebRequest request = CreateRequest(requestParams);
TextSearchState state = new TextSearchState();
state.SearchText = searchText;
state.Callback = callback;
state.Request = request;
request.BeginGetResponse(Service_ItemSearchCompleted, state);
}
//if it has then retrive the results from the cache
else
{
BooksFoundEvent foundEvent = new BooksFoundEvent();
foundEvent.Success = true;
foundEvent.Results = _textSearches[searchText];
callback.Invoke(string.Empty, foundEvent);
}
}
public void FindSimilarBooks(string itemID, BooksFoundEventHandler callback)
{
if (!_books.ContainsKey(itemID)) {
BooksFoundEvent foundEvent = new BooksFoundEvent();
foundEvent.Success = false;
foundEvent.FailureMessage = "No item exists for the given ID";
foundEvent.Results = new List<Book>();
callback.Invoke(itemID, foundEvent);
}
//check if the search has been cached, if it hasn't then call the web service
if (!_similaritySearches.ContainsKey(itemID))
{
IDictionary<string, string> requestParams = new Dictionary<string, String>();
requestParams["Service"] = "AWSECommerceService";
requestParams["Operation"] = "SimilarityLookup";
requestParams["ItemId"] = itemID;
requestParams["ResponseGroup"] = RESPONSE_GROUP;
requestParams["SimilarityType"] = "Random";
requestParams["Version"] = SERVICE_VERSION;
requestParams["AssociateTag"] = Constants.MY_AWS_ASSOCIATE_TAG;
_similaritySearches.Add(itemID, new List<Book>());
WebRequest request = CreateRequest(requestParams);
TextSearchState state = new TextSearchState();
state.SearchText = itemID;
state.Callback = callback;
state.Request = request;
request.BeginGetResponse(Service_SimilarityLookupCompleted, state);
}
//if it has then retrieve the results from the cache
else
{
BooksFoundEvent foundEvent = new BooksFoundEvent();
foundEvent.Success = true;
foundEvent.Results = _similaritySearches[itemID];
callback.Invoke(itemID, foundEvent);
}
}