private void PopRequest()
{
try
{
foreach (KeyValuePair <string, KeyValuePair <DatabaseOperation, WebClient> > Entry in DownloadClientTable)
{
string BaseUrl = UrlTools.GetBaseUrl();
string AddressString = $"{BaseUrl}/{Entry.Key}";
DatabaseOperation Operation = Entry.Value.Key;
WebClient DownloadClient = Entry.Value.Value;
AddLogEntry("Request started");
AddLogEntry($"Address: {AddressString}");
CurrentDownload = DownloadClient;
CurrentOperation = Operation;
Uri UriAddress = new Uri(AddressString, UriKind.Relative);
DownloadClient.DownloadStringCompleted += OnDownloadCompleted;
DownloadClient.DownloadStringAsync(UriAddress);
AddLogEntry("Download async started");
return;
}
AddLogEntry("No more request");
}
catch (Exception e)
{
AddLogEntry(e.Message);
}
}
public List <IDictionary <string, string> > ProcessMultipleResponse(DatabaseOperation operation, List <string> keyList)
{
List <IDictionary <string, string> > Result = null;
if (RequestResultTable.ContainsKey(operation))
{
List <IDictionary <string, object> > ResultList = RequestResultTable[operation];
RequestResultTable.Remove(operation);
foreach (IDictionary <string, object> Item in ResultList)
{
IDictionary <string, string> ResultLine = null;
foreach (string Key in keyList)
{
if (Item.ContainsKey(Key) && (ResultLine == null || !ResultLine.ContainsKey(Key)) && Item[Key] is string)
{
if (ResultLine == null)
{
ResultLine = new Dictionary <string, string>();
if (Result == null)
{
Result = new List <IDictionary <string, string> >();
}
Result.Add(ResultLine);
}
ResultLine.Add(Key, Item[Key] as string);
}
}
}
}
return(Result);
}
public void OnDownloadCompleted(object sender, DownloadStringCompletedEventArgs e)
{
AddLogEntry("Download async completed");
WebClient DownloadClient = CurrentDownload;
DatabaseOperation Operation = CurrentOperation;
CurrentDownload = null;
CurrentOperation = null;
if (DownloadClient != null)
{
foreach (KeyValuePair <string, KeyValuePair <DatabaseOperation, WebClient> > Entry in DownloadClientTable)
{
if (DownloadClient == Entry.Value.Value)
{
DownloadClientTable.Remove(Entry.Key);
AddLogEntry("Request withdrawn");
break;
}
}
AddLogEntry($"Request {Operation.Name} completed");
List <IDictionary <string, object> > RequestResult = new List <IDictionary <string, object> >();
try
{
string Content = e.Result;
RequestResult = ParseResponse(Content);
}
catch (Exception ex)
{
AddLogEntry(ex.Message);
}
RequestResultTable.Add(Operation, RequestResult);
AddLogEntry($"Request {Operation.Name} result available");
Operation.Callback?.Invoke(this, new CompletionEventArgs(Operation));
}
if (DownloadClientTable.Count > 0)
{
Windows.UI.Xaml.Window.Current.Dispatcher.BeginInvoke(PopRequest);
}
}
public void DebugWriteState()
{
foreach (KeyValuePair <DatabaseOperation, List <IDictionary <string, object> > > ResultEntry in RequestResultTable)
{
DatabaseOperation Operation = ResultEntry.Key;
List <IDictionary <string, object> > ResultList = ResultEntry.Value;
AddLogEntry($"Operation: {Operation.Name}, {ResultList.Count} entries");
for (int i = 0; i < ResultList.Count; i++)
{
IDictionary <string, object> Item = ResultList[i];
AddLogEntry($"#{i}, {Item.Count} keys");
foreach (KeyValuePair <string, object> Entry in Item)
{
AddLogEntry($"{Entry.Key} -> {Entry.Value}");
}
}
}
}
private void StartRequest(DatabaseOperation operation)
{
if (DebugLog)
{
operation.DebugStart();
}
string AddressString = operation.RequestString(QueryScriptPath);
if (!DownloadClientTable.ContainsKey(AddressString))
{
DownloadClientTable.Add(AddressString, new KeyValuePair <DatabaseOperation, WebClient>(operation, new WebClient()));
AddLogEntry($"{operation.TypeName} added");
if (DownloadClientTable.Count == 1)
{
PopRequest();
}
}
else
{
AddLogEntry($"An identical {operation.TypeName} request is already queued");
}
}
public CompletionEventArgs(DatabaseOperation operation)
{
Operation = operation;
}
