/// <summary>
/// Lists the graph sin the Store asynchronously
/// </summary>
/// <param name="callback">Callback</param>
/// <param name="state">State to pass to the callback</param>
public override void ListGraphs(AsyncStorageCallback callback, object state)
{
// Use ListUrisHandler and make an async query to list the graphs, when that returns we invoke the correct callback
ListUrisHandler handler = new ListUrisHandler("g");
((IAsyncQueryableStorage)this).Query(null, handler, "SELECT DISTINCT ?g WHERE { GRAPH ?g { ?s ?p ?o } }", (sender, args, st) =>
{
if (args.WasSuccessful)
{
callback(this, new AsyncStorageCallbackArgs(AsyncStorageOperation.ListGraphs, handler.Uris), state);
}
else
{
callback(this, new AsyncStorageCallbackArgs(AsyncStorageOperation.ListGraphs, args.Error), state);
}
}, state);
}
/// <summary>
/// Lists the Graphs from the Repository
/// </summary>
/// <param name="callback">Callback</param>
/// <param name="state">State to pass to the callback</param>
/// <returns></returns>
public override void ListGraphs(AsyncStorageCallback callback, Object state)
{
try
{
//Use the /contexts method to get the Graph URIs
//HACK: Have to use SPARQL JSON as currently Dydra's SPARQL XML Results are malformed
HttpWebRequest request = this.CreateRequest("/contexts", MimeTypesHelper.CustomHttpAcceptHeader(MimeTypesHelper.SparqlResultsJson), "GET", new Dictionary <string, string>());
request.BeginGetResponse(r =>
{
try
{
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(r);
ISparqlResultsReader parser = MimeTypesHelper.GetSparqlParser(response.ContentType);
ListUrisHandler handler = new ListUrisHandler("contextID");
parser.Load(handler, new StreamReader(response.GetResponseStream()));
response.Close();
callback(this, new AsyncStorageCallbackArgs(AsyncStorageOperation.ListGraphs, handler.Uris), state);
}
catch (WebException webEx)
{
callback(this, new AsyncStorageCallbackArgs(AsyncStorageOperation.ListGraphs, StorageHelper.HandleHttpError(webEx, "list Graphs asynchronously from")), state);
}
catch (Exception ex)
{
callback(this, new AsyncStorageCallbackArgs(AsyncStorageOperation.ListGraphs, StorageHelper.HandleError(ex, "list Graphs asynchronously from")), state);
}
}, state);
}
catch (WebException webEx)
{
callback(this, new AsyncStorageCallbackArgs(AsyncStorageOperation.ListGraphs, StorageHelper.HandleHttpError(webEx, "list Graphs asynchronously from")), state);
}
catch (Exception ex)
{
callback(this, new AsyncStorageCallbackArgs(AsyncStorageOperation.ListGraphs, StorageHelper.HandleError(ex, "list Graphs asynchronously from")), state);
}
}
/// <summary>
/// Lists the Graphs in the Store asynchronously
/// </summary>
/// <param name="callback">Callback</param>
/// <param name="state">State to pass to the callback</param>
public virtual void ListGraphs(AsyncStorageCallback callback, object state)
{
if (this is IAsyncQueryableStorage)
{
//Use ListUrisHandler and make an async query to list the graphs, when that returns we invoke the correct callback
ListUrisHandler handler = new ListUrisHandler("g");
((IAsyncQueryableStorage)this).Query(null, handler, "SELECT DISTINCT ?g WHERE { GRAPH ?g { ?s ?p ?o } }", (sender, args, st) =>
{
if (args.WasSuccessful)
{
callback(this, new AsyncStorageCallbackArgs(AsyncStorageOperation.ListGraphs, handler.Uris), state);
}
else
{
callback(this, new AsyncStorageCallbackArgs(AsyncStorageOperation.ListGraphs, args.Error), state);
}
}, state);
}
else
{
callback(this, new AsyncStorageCallbackArgs(AsyncStorageOperation.ListGraphs, new RdfStorageException("Underlying store does not supported listing graphs asynchronously or has failed to appropriately override this method")), state);
}
}
