/// <summary>
/// Gets the next active command to be processed.
/// </summary>
/// <param name="sessionGroupId">The GUID that's used as the unique Id of the subject session group.</param>
/// <returns>The next active command; NULL if there is a command being processed or no active command.</returns>
public PipelineSyncCommand?GetNextActiveCommand(Guid sessionGroupId)
{
using (RuntimeEntityModel context = RuntimeEntityModel.CreateInstance())
{
int newStateValue = (int)PipelineSyncCommandState.New;
int processingStateValue = (int)PipelineSyncCommandState.Processing;
var cmdQuery = from c in context.RTOrchestrationCommandSet
where (c.Status == newStateValue || c.Status == processingStateValue) &&
c.SessionGroup.GroupUniqueId.Equals(sessionGroupId)
orderby c.Id
select c;
if (cmdQuery.Count() == 0 ||
cmdQuery.First().Status == processingStateValue)
{
return(null);
}
RTOrchestrationCommand nextCmd = cmdQuery.First();
nextCmd.Status = (int)PipelineSyncCommandState.Processing;
context.TrySaveChanges();
return((PipelineSyncCommand)nextCmd.Command);
}
}
/// <summary>
/// Add a new sync command to the queue for processing.
/// </summary>
/// <param name="sessionGroupId">The GUID that's used as the unique Id of the subject session group.</param>
/// <param name="newCmd">The new command to be appended to the queue.</param>
public void AddCommand(Guid sessionGroupId, PipelineSyncCommand newCmd)
{
using (RuntimeEntityModel context = RuntimeEntityModel.CreateInstance())
{
var sessionGroupQuery =
from sg in context.RTSessionGroupSet
where sg.GroupUniqueId.Equals(sessionGroupId)
select sg;
Debug.Assert(sessionGroupQuery.Count() == 1, "sessionGroupQuery.Count() != 1");
if (sessionGroupQuery.Count() != 1)
{
// [teyang] TODO add exception desc
throw new InvalidOperationException();
}
var rtSessionGroup = sessionGroupQuery.First();
RTOrchestrationCommand command = RTOrchestrationCommand.CreateRTOrchestrationCommand(
0, // identity column id is auto-generated
(int)newCmd,
(int)PipelineSyncCommandState.New);
command.SessionGroup = rtSessionGroup;
context.AddToRTOrchestrationCommandSet(command);
context.TrySaveChanges();
}
}
