Question

I have a Site which creates some form of a Report. The whole process takes up to a Minute. To increase the performance I was thinking about turning the synchronous controller into a Asynchronous Controller.

I read through a lot of topics, and guides but I just don’t seem to get the hang of it.

Right now I have a DataSet which has ~15 DataTables. Each of the ~15 DataTables is filled by a different Query.

To convert this Page to a Asynchronous Controller i created a ConnectionManager, created 15 getMethods for each DataTable and each DataTable is in the Model. I also created 2 Controller – one called [Name]Async and one called [Name]Complete. However, now I am stuck.

How do I create ~15 Threads and assign each the Task to populate a DataTable with the getMethod?!

Here some parts of the Code.

Controller

public class RunTableStatisticsController : AsyncController
{
    public void RunTableStatisticsAsync()
    {
        AsyncManager.OutstandingOperations.Increment(2);

        // Create Threads who populate RunTableStatisticsModels DataTables
    }

    public ViewResult RunTableStatisticsComplete(RunTableStatisticsModel voModel)
    {
        return View(voModel);
    }
}

getMethod

public static DataTable getDataTable1()
        {
            try
            {
                DataTable dtTemp= new DataTable();
                dtTemp.Columns.Add(new DataColumn("ColumnName1", typeof(string)));
dtTemp.Columns.Add(new DataColumn("ColumnName2", typeof(string)));

                string sQuery = "select * from 1";

                // Instantiate the Command Object
                OleDbCommand dbCommand = new OleDbCommand(sQuery, ..MyConnectionManager.Connection);
                dbCommand.CommandType = CommandType.Text;

                // Execute the Stored Procedure
                OleDbDataReader dr = dbCommand.ExecuteReader();

                while (dr.Read())
                {
                    DataRow row = dtTemp.NewRow();
                    row["ColumnName1"] = dr["ColumnName1"]);
                    row["ColumnName2"] = dr["ColumnName2"];

                    dtTemp.Rows.Add(row);
                }
                return dtTemp;

            }

            catch (Exception ex)
            {
                throw new Exception("Error: Reading database.", ex);
            }
        }

Correspondend I do have in my Model

public DataTable dtTable1{ get; set; }

And then I have a View which has Telerik Grid Extensions which will be filled by the Data.

Answer 1

You could use the TPL to parallelize the retrieval of those DataTables. Here’s an example with 2, if you have more, you might consider using collections of DataTables:

public class RunTableStatisticsController : AsyncController 
{
    public void RunTableStatisticsAsync()
    {
        AsyncManager.OutstandingOperations.Increment(2);

        // Create tasks that populate RunTableStatisticsModels DataTables

        Task.Factory.StartNew(() =>
        {
            AsyncManager.Parameters["dt1"] = DAL.GetDataTable1();
            AsyncManager.OutstandingOperations.Decrement();
        });

        Task.Factory.StartNew(() =>
        {
            AsyncManager.Parameters["dt2"] = DAL.GetDataTable2();
            AsyncManager.OutstandingOperations.Decrement();
        });
    }

    public ViewResult RunTableStatisticsComplete(DataTable dt1, DataTable dt2)
    {
        var model = new RunTableStatisticsModel
        {
            DtTable1 = dt1,
            DtTable2 = dt2,
        };
        return View(model);
    }
}