private void StartDispatch()
{
logger.Info("Dispatcher thread started.");
try
{
// TODO: allow scheduling of multiple threads in one go
while (!_stop)
{
try
{
//logger.Debug("WaitOne for 1000 millis on DedicatedSchedulerActive");
InternalShared.Instance.DedicatedSchedulerActive.WaitOne(1000, false);
//logger.Debug("Getting a dedicated schedule");
DedicatedSchedule ds = InternalShared.Instance.Scheduler.ScheduleDedicated();
if (ds == null)
{
//to avoid blocking again if stop has been called.
if (!_stop)
{
InternalShared.Instance.DedicatedSchedulerActive.Reset();
//logger.Debug("Dedicated schedule is null. Reset the DedicatedSchedulerActive waithandle");
}
}
else
{
logger.Debug(String.Format("Scheduler mapped thread {0} to executor: {1}", ds.TI.ThreadId, ds.ExecutorId));
MExecutor me = new MExecutor(ds.ExecutorId);
try
{
// dispatch thread
me.ExecuteThread(ds);
/// [email protected] - Feb 28, 2006:
/// updating the thread's status is done inside ExecuteThread after it was decided
/// whether this executor can take it or not
/// this prevents race conditions if the Executor finishes very quickly
/// and we overwrite here the Executor's status back to Scheduled after it was finished
// // update thread state 'after' it is dispatched. (kna changed this: aug19,05). to prevent the scheduler from hanging here.
// mt.CurrentExecutorId = ds.ExecutorId;
// mt.State = ThreadState.Scheduled;
// logger.Debug("Scheduled thread " + ds.TI.ThreadId + " to executor:"+ds.ExecutorId);
}
catch (Exception e)
{
logger.Error("Some error occured trying to schedule. Reset-ing the thread to be scheduled. Continuing...", e);
MThread mt = new MThread(ds.TI);
mt.Reset(); // this should happen as part of the disconnection
}
}
}
catch (ThreadAbortException)
{
logger.Debug("Dispatcher Thread resetting abort (1)...");
Thread.ResetAbort();
}
catch (Exception e)
{
if (e is DbException)
{
//some problem contacting database
//wait for a bit and try again
logger.Debug("Error contacting database:", e);
Thread.Sleep(30000);
//TODO: need to provide fault tolerance here: what if the database/storage cannot be contacted.?
//TODO: in that case, just raise an event, and let the Service/exec deal with it.
}
else
{
logger.Error("Dispatch thread error. Continuing...", e);
}
}
} //while
}
catch (ThreadAbortException)
{
logger.Debug("Scheduler Thread resetting abort (2)...");
Thread.ResetAbort();
}
catch (Exception e)
{
logger.Error("StartDispatch thread error. Scheduler thread stopped.", e);
}
logger.Info("Scheduler thread exited.");
}
private void StartDispatch()
{
logger.Info("Dispatcher thread started.");
try
{
// TODO: allow scheduling of multiple threads in one go
while (!_stop)
{
try
{
//logger.Debug("WaitOne for 1000 millis on DedicatedSchedulerActive");
InternalShared.Instance.DedicatedSchedulerActive.WaitOne(1000, false);
//logger.Debug("Getting a dedicated schedule");
DedicatedSchedule ds = InternalShared.Instance.Scheduler.ScheduleDedicated();
if (ds == null)
{
//to avoid blocking again if stop has been called.
if (!_stop)
{
InternalShared.Instance.DedicatedSchedulerActive.Reset();
//logger.Debug("Dedicated schedule is null. Reset the DedicatedSchedulerActive waithandle");
}
}
else
{
logger.Debug(String.Format("Scheduler mapped thread {0} to executor: {1}", ds.TI.ThreadId, ds.ExecutorId));
MExecutor me = new MExecutor(ds.ExecutorId);
try
{
// dispatch thread
me.ExecuteThread(ds);
/// [email protected] - Feb 28, 2006:
/// updating the thread's status is done inside ExecuteThread after it was decided
/// whether this executor can take it or not
/// this prevents race conditions if the Executor finishes very quickly
/// and we overwrite here the Executor's status back to Scheduled after it was finished
// // update thread state 'after' it is dispatched. (kna changed this: aug19,05). to prevent the scheduler from hanging here.
// mt.CurrentExecutorId = ds.ExecutorId;
// mt.State = ThreadState.Scheduled;
// logger.Debug("Scheduled thread " + ds.TI.ThreadId + " to executor:"+ds.ExecutorId);
}
catch (Exception e)
{
logger.Error("Some error occured trying to schedule. Reset-ing the thread to be scheduled. Continuing...", e);
MThread mt = new MThread(ds.TI);
mt.Reset(); // this should happen as part of the disconnection
}
}
}
catch (ThreadAbortException)
{
logger.Debug("Dispatcher Thread resetting abort (1)...");
Thread.ResetAbort();
}
catch (Exception e)
{
if (e is DbException)
{
//some problem contacting database
//wait for a bit and try again
logger.Debug("Error contacting database:", e);
Thread.Sleep(30000);
//TODO: need to provide fault tolerance here: what if the database/storage cannot be contacted.?
//TODO: in that case, just raise an event, and let the Service/exec deal with it.
}
else
{
logger.Error("Dispatch thread error. Continuing...", e);
}
}
} //while
}
catch (ThreadAbortException)
{
logger.Debug("Scheduler Thread resetting abort (2)...");
Thread.ResetAbort();
}
catch (Exception e)
{
logger.Error("StartDispatch thread error. Scheduler thread stopped.", e);
}
logger.Info("Scheduler thread exited.");
}
