/// <summary>
/// Status for a DistributedTask are Succesfull (S),
/// No assigned (N) and Processing (P)
/// </summary>
/// <param name="miDistributeTask"></param>
/// <returns></returns>
public bool SaveResults(DistributeTask miDistributeTask)
{
var miConexion = new SqlConnection(StrCon);
miConexion.Open();
var miSql = "UPDATE DistributeTask " +
"SET Dt_Status = 'S', " +
" Dt_Result_Best = '" + miDistributeTask.Result_Best + "', " +
" Dt_Date = GetDate() " +
"WHERE Dt_Id = '" + miDistributeTask.Id + "' ";
var miComando = new SqlCommand(miSql, miConexion);
var filasAfectadas = miComando.ExecuteNonQuery();
miConexion.Close();
return(filasAfectadas != 0);
}
/// <summary>
/// Return only one Distributed task to be executed for one client (status N),
/// The assigned task change its status to P for Processing, thus preventing
/// another client from trying to execute that task.
/// </summary>
/// <returns></returns>
public DistributeTask GetTask()
{
var myConexion = new SqlConnection(StrCon);
var mySql = "SELECT TOP (1) Dt_Id, Dt_Problem, Dt_Algorithm, " +
" Dt_Seed, Dt_Result_Best " +
"FROM DistributeTask " +
"WHERE Dt_Status = 'N' " +
"ORDER BY Dt_Id ASC";
var myDs = new DataSet();
var myAdapter = new SqlDataAdapter(mySql, myConexion);
myAdapter.Fill(myDs, "DistributeTask");
if (myDs.Tables[0].Rows.Count == 0)
{
return(null); //There is no Distributed Tasks to be executed
}
myConexion.Open();
var thisRow = myDs.Tables[0].Rows[0];
var myDistributedTask = new DistributeTask
{
Id = thisRow["Dt_Id"].ToString(),
Problem = thisRow["Dt_Problem"].ToString(),
Algorithm = thisRow["Dt_Algorithm"].ToString(),
Seed = int.Parse(thisRow["Dt_Seed"].ToString())
};
mySql = "UPDATE DistributeTask " +
"SET Dt_Status ='P' " +
"WHERE Dt_Id = '" + myDistributedTask.Id + "' ";
var miComando = new SqlCommand(mySql, myConexion);
miComando.ExecuteNonQuery();
myConexion.Close();
return(myDistributedTask);
}