private GraphResultSet CreateGraphResultSet(RowSet rs, IGraphTypeSerializer serializer)
{
return(GraphResultSet.CreateNew(
rs,
serializer.GraphProtocol,
serializer.GetGraphRowParser()));
}
/// <summary>
/// Gets the personalized video suggestions for a specific user.
/// Based on DSL tutorial provided here, we changed the recommendation from pre-aggration
/// tables to real-time graph recommendation.
/// https://academy.datastax.com/content/gremlin-dsls-net-dse-graph
/// </summary>
public override async Task <GetSuggestedForUserResponse> GetSuggestedForUser(GetSuggestedForUserRequest request,
ServerCallContext context)
{
Logger.Information("Request suggested video(s) for user {user}", request.UserId.Value);
GraphTraversalSource g = DseGraph.Traversal(_session);
// DSL Baby !
var traversal = g.RecommendVideos(request.UserId.ToGuid().ToString(), 5, 4, 1000, 5);
GraphResultSet result = await _session.ExecuteGraphAsync(traversal);
// Building GRPC response from list of results vertices (hopefully 'numberOfVideosExpected')
var grpcResponse = new GetSuggestedForUserResponse
{
UserId = request.UserId,
PagingState = ""
};
foreach (IVertex vertex in result.To <IVertex>())
{
Logger.Information("Result " + vertex);
grpcResponse.Videos.Add(MapVertexToVideoPreview(vertex));
}
return(grpcResponse);
}
private static void VerifyGraphResultSet(GraphResultSet rs)
{
var v = rs.First().ToVertex();
Assert.AreEqual("person", v.Label);
Assert.AreEqual("marko", v.GetProperty("name").Value.ToString());
Assert.AreEqual(29, v.GetProperty("age").Value.ToInt32());
}
private static void VerifyGraphResultSet(ISession session, GraphResultSet rs)
{
var v = rs.First().ToVertex();
Assert.AreEqual("person", v.Label);
TestHelper.FillVertexProperties(session, v);
Assert.AreEqual("marko", v.GetProperty("name").Value.ToString());
Assert.AreEqual(29, v.GetProperty("age").Value.ToInt32());
}
public async Task <GraphResultSet> ExecuteGraphAsync(IGraphStatement graphStatement)
{
var stmt = graphStatement.ToIStatement(_config.GraphOptions);
await GetAnalyticsMaster(stmt, graphStatement).ConfigureAwait(false);
var rs = await _coreSession.ExecuteAsync(stmt).ConfigureAwait(false);
return(GraphResultSet.CreateNew(rs, graphStatement, _config.GraphOptions));
}
private void ValidateVertexResult(GraphResultSet rs, string vertexLabel, string propertyName, string expectedValueString)
{
var first = rs.FirstOrDefault();
Assert.NotNull(first);
var vertex = first.ToVertex();
Assert.AreEqual(vertex.Label, vertexLabel);
var valueString = vertex.Properties[propertyName].ToArray()[0].Get <string>("value");
Assert.AreEqual(valueString, expectedValueString);
}
private void ValidateVertexResult(GraphResultSet rs, string vertexLabel, string propertyName, string expectedValueString)
{
var first = rs.FirstOrDefault();
Assert.NotNull(first);
var vertex = first.ToVertex();
Assert.AreEqual(vertex.Label, vertexLabel);
var valueString = vertex.Properties[propertyName].ToArray()[0].Get<string>("value");
Assert.AreEqual(valueString, expectedValueString);
}
