/// <summary>
/// Gets an updated and ordered list of graph nodes of a specific length.
/// </summary>
/// <param name="maxLength">The maximum character length that will be used for the index.</param>
/// <param name="acKey">The autocomplete key to potentially be included in this key index.</param>
/// <param name="acBlock">The current list of graph nodes already existing and to be reordered based on the acKey property.</param>
/// <returns>Returns an ordered list of key value pairs that represents what will display in the search box for the acKey property.</returns>
private static GraphNode[] UpdateOrderedJsonBlock(int maxLength, GraphNode acKey, GraphNode[] acBlock)
{
var keyIndex = acBlock
.ToList()
.IndexOf(acBlock
.Where(aKey => aKey.label.Equals(acKey.label, StringComparison.InvariantCultureIgnoreCase))
.First());
acBlock[keyIndex] = acKey;
var acBlockList = acBlock.ToList();
acBlockList = acBlockList
.OrderByDescending(acbk => acbk.size)
.ToList()
.Take(maxLength)
.ToList();
acBlock = acBlockList
.ToArray();
return acBlock;
}
/// <summary>
/// Update the JSON file and its stream on blob storage.
/// </summary>
/// <param name="queryKey">The query key to update the JSON file index.</param>
/// <param name="maxLength">The maximum character length to index for each query key.</param>
/// <param name="blobStream">The stream for the JSON file.</param>
/// <param name="jsSerializer">For JSON serialization and deserialization.</param>
/// <returns></returns>
private static GraphNode[] UpdateBlobStreamForKey(IGraphNode queryKey, int maxLength, Stream blobStream, JavaScriptSerializer jsSerializer)
{
var acBlock = jsSerializer.Deserialize<GraphNode[]>(Regex.Replace(new StreamReader(blobStream).ReadToEnd(), @"^dataCallback\(|\)$", "", RegexOptions.IgnoreCase));
var acKey = new GraphNode() { label = queryKey.label.ToLowerInvariant(), size = queryKey.size };
// Check for key phrase
var hasKey = acBlock.ToList().Any(aKey => aKey.label.Equals(acKey.label, StringComparison.InvariantCultureIgnoreCase));
// Update key weight and pushed back to storage
if (hasKey)
{
acBlock = UpdateOrderedJsonBlock(maxLength, acKey, acBlock);
}
else
{
acBlock = GetOrderedJsonBlock(maxLength, acKey, acBlock);
}
return acBlock;
}
/// <summary>
/// Update the JSON block blob using the blob service class. Manages concurrent access conditions for parallel transactions.
/// </summary>
/// <param name="storage">The cloud storage account on Windows Azure platform.</param>
/// <param name="containerId">The public container id on the cloud storage account.</param>
/// <param name="key">The partial key query to index for.</param>
/// <param name="jsSerializer">The serialization library to manage converting the JSON string to raw bytes.</param>
/// <param name="acBlock">The list of graph nodes ordered by size.</param>
/// <returns></returns>
private static Stream UpdateJsonBlockBlob(CloudStorageAccount storage, string containerId, string key, JavaScriptSerializer jsSerializer, GraphNode[] acBlock)
{
Stream blobStream;
var jsonString = string.Format("dataCallback({0})", jsSerializer.Serialize(acBlock));
blobStream = new MemoryStream();
var bytes = Encoding.UTF8.GetBytes(jsonString);
blobStream.Write(bytes, 0, bytes.Length);
blobStream.Seek(0, SeekOrigin.Begin);
BlobService.PutBlob(storage, containerId, key.ToLowerInvariant(), blobStream, "cache", 0);
return blobStream;
}
/// <summary>
/// Gets an ordered list of graph nodes of a specific length.
/// </summary>
/// <param name="maxLength">The maximum character length that will be used for the index.</param>
/// <param name="acKey">The autocomplete key to potentially be included in this key index.</param>
/// <param name="acBlock">The current list of graph nodes already existing and to be reordered based on the acKey property.</param>
/// <returns>Returns an ordered list of key value pairs that represents what will display in the search box for the acKey property.</returns>
private static GraphNode[] GetOrderedJsonBlock(int maxLength, GraphNode acKey, GraphNode[] acBlock)
{
List<GraphNode> acBlockList = acBlock.ToList();
acBlockList.Add(acKey);
acBlockList = acBlockList
.OrderByDescending(acbk => acbk.size)
.ToList()
.Take(maxLength)
.ToList();
acBlock = acBlockList.ToArray();
return acBlock;
}