/// <summary>
/// Executes a query.
/// </summary>
/// <param name="connection">The connection.</param>
/// <param name="cql">The CQL.</param>
/// <param name="logger">The logger.</param>
/// <returns>
/// A CqlDataReader that can be used to access the query results
/// </returns>
private async Task <CqlDataReader> ExecQuery(Connection connection, string cql, Logger logger)
{
logger.LogVerbose("Excuting query {0} on {1}", cql, connection);
var query = new QueryFrame(cql, CqlConsistency.One);
var result = (ResultFrame)await connection.SendRequestAsync(query, logger).ConfigureAwait(false);
var reader = new CqlDataReader(result);
logger.LogVerbose("Query {0} returned {1} results", cql, reader.Count);
return(reader);
}
/// <summary>
/// Executes the query async on the given connection
/// </summary>
/// <param name="connection">The connection.</param>
/// <param name="state">The state.</param>
/// <param name="logger">The logger.</param>
/// <returns></returns>
/// <exception cref="CqlException">Unexpected frame received</exception>
private async Task <ResultFrame> ExecuteInternalAsync(Connection connection, QueryExecutionState state, Logger logger)
{
Frame query;
if (_prepared)
{
ResultFrame prepareResult = await PrepareInternalAsync(connection, state, logger).ConfigureAwait(false);
query = new ExecuteFrame(prepareResult.PreparedQueryId, _level, state.Values);
logger.LogVerbose("Sending execute {0} using {1}", _cql, connection);
}
else
{
query = new QueryFrame(_cql, _level);
logger.LogVerbose("Sending query {0} using {1}", _cql, connection);
}
//update frame with tracing option if requested
if (state.TracingEnabled)
{
query.Flags |= FrameFlags.Tracing;
}
Frame response = await connection.SendRequestAsync(query, logger, state.Load).ConfigureAwait(false);
var result = response as ResultFrame;
if (result != null)
{
//read all the data into a buffer, if requested
if (state.UseBuffering)
{
logger.LogVerbose("Buffering used, reading all data");
await result.BufferDataAsync().ConfigureAwait(false);
}
return(result);
}
throw new CqlException("Unexpected frame received " + response.OpCode);
}
private void panel1_Load(object sender, EventArgs e)
{
// checkf = new Checkframe();
managementf = new ManagementFrame();
queryf = new QueryFrame();
}
IEnumerator <ITask> QueryFrameHandler(QueryFrame query)
{
if (_state.Image == null)
{
query.ResponsePort.Post(new QueryFrameResponse());
yield break;
}
if (query.Body.Format == Guid.Empty)
{
// raw image requested;
BitmapData raw = null;
try
{
raw = _state.Image.LockBits(new Rectangle(Point.Empty, _state.Size),
ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
int size = raw.Height * raw.Stride;
QueryFrameResponse response = new QueryFrameResponse();
response.TimeStamp = _state.TimeStamp;
response.Frame = new byte[size];
response.Size = new Size(raw.Width, raw.Height);
response.Format = Guid.Empty;
System.Runtime.InteropServices.Marshal.Copy(raw.Scan0, response.Frame, 0, size);
query.ResponsePort.Post(response);
}
finally
{
if (raw != null)
{
_state.Image.UnlockBits(raw);
}
}
}
else
{
ImageFormat format = new ImageFormat(query.Body.Format);
using (MemoryStream stream = new MemoryStream())
{
Size size = query.Body.Size;
if (size == _state.Image.Size ||
size.Width == 0 ||
size.Height == 0 ||
size.Width >= _state.Image.Width ||
size.Height >= _state.Image.Height)
{
size = _state.Image.Size;
_state.Image.Save(stream, format);
}
else
{
using (Bitmap temp = new Bitmap(
_state.Image, query.Body.Size))
{
temp.Save(stream, format);
}
}
QueryFrameResponse response = new QueryFrameResponse();
response.TimeStamp = _state.TimeStamp;
response.Frame = new byte[(int)stream.Length];
response.Size = size;
response.Format = format.Guid;
stream.Position = 0;
stream.Read(response.Frame, 0, response.Frame.Length);
query.ResponsePort.Post(response);
}
}
yield break;
}
