// call from the threadProvider about the availability of a thread.
internal void RunSome(object ignored)
{
using (ScheduleWork work = new ScheduleWork(this))
{
using (new WorkflowTraceTransfer(this.InstanceId))
{
using (new SchedulerLockGuard(this._schedulerLock, this))
{
using (new ServiceEnvironment(this.rootActivity))
{
// check if this is a valid in-memory instance
if (!this.IsInstanceValid)
return;
// check if instance already done
if ((this.rootActivity.ExecutionStatus == ActivityExecutionStatus.Closed) || (WorkflowStatus.Completed == this.WorkflowStatus) || (WorkflowStatus.Terminated == this.WorkflowStatus))
return;
bool ignoreFinallyBlock = false;
//
// For V1 we don't support flow through transaction on the service thread
using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Suppress))
{
try
{
FireWorkflowExecutionEvent(this, WorkflowEventInternal.Executing);
// run away ... run away...
this.RunScheduler();
}
catch (Exception e)
{
if (WorkflowExecutor.IsIrrecoverableException(e))
{
ignoreFinallyBlock = true;
throw;
}
else
{
WorkflowTrace.Runtime.TraceEvent(TraceEventType.Error, 0, "Workflow Runtime: WorkflowExecutor: Fatal exception thrown in the scheduler. Terminating the workflow instance '{0}'. Exception:{1}\n{2}", this.InstanceIdString, e.Message, e.StackTrace);
this.TerminateOnIdle(WorkflowExecutor.GetNestedExceptionMessage(e));
this.ThrownException = e;
}
}
finally
{
if (!ignoreFinallyBlock)
{
FireWorkflowExecutionEvent(this, WorkflowEventInternal.NotExecuting);
}
}
scope.Complete();
}
}
}
}
}
}
internal void Start()
{
using (ScheduleWork work = new ScheduleWork(this))
{
using (this.ExecutorLock.Enter())
{
if (this.WorkflowStatus != WorkflowStatus.Created)
throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, ExecutionStringManager.CannotStartInstanceTwice, this.InstanceId));
// Set a new ServiceEnvironment to establish a current batch in TLS
// This is needed for synchronous status change notification at start
// (status init->executing) when there is no batch in TLS yet
// and there are subscribers like tracking
this.WorkflowStatus = WorkflowStatus.Running;
using (new ServiceEnvironment(this.rootActivity))
{
FireWorkflowExecutionEvent(this, WorkflowEventInternal.Starting);
try
{
using (ActivityExecutionContext executionContext = new ActivityExecutionContext(this.rootActivity, true))
{
// make sure the scheduler is able to run
this.schedulingContext.CanRun = true;
// Since we are actually scheduling work at this point, we should grab
// the scheduler lock. This will avoid ----s some operations we schedule
// start executing before we are done scheduling all operations.
using (new SchedulerLockGuard(this._schedulerLock, this))
{
executionContext.ExecuteActivity(this.rootActivity);
}
}
}
catch (Exception e)
{
Terminate(e.Message);
throw;
}
FireWorkflowExecutionEvent(this, WorkflowEventInternal.Started);
}
}
}
}
internal void DeliverTimerSubscriptions()
{
using (ScheduleWork work = new ScheduleWork(this))
{
using (this._executorLock.Enter())
{
if (this.IsInstanceValid)
{
using (this.MessageDeliveryLock.Enter())
{
using (new ServiceEnvironment(this.rootActivity))
{
if (!this.IsInstanceValid)
return;
TimerEventSubscriptionCollection queue = TimerQueue;
bool done = false;
while (!done)
{
lock (queue.SyncRoot)
{
TimerEventSubscription sub = queue.Peek();
if (sub == null || sub.ExpiresAt > DateTime.UtcNow)
{
done = true;
}
else
{
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "Delivering timer subscription for instance {0}", this.InstanceIdString);
stateChangedSincePersistence = true;
lock (qService.SyncRoot)
{
if (qService.Exists(sub.QueueName))
{
qService.EnqueueEvent(sub.QueueName, sub.SubscriptionId);
}
}
queue.Dequeue();
}
}
}
}
}
}
}
}
}
internal void Registered(bool isActivation)
{
using (ScheduleWork work = new ScheduleWork(this))
{
this.Scheduler.ResumeIfRunnable();
}
if (isActivation)
FireWorkflowExecutionEvent(this, WorkflowEventInternal.Created);
else
FireWorkflowExecutionEvent(this, WorkflowEventInternal.Loaded);
}
internal void ApplyWorkflowChanges(WorkflowChanges workflowChanges)
{
// Accessing InstanceId is not thread safe here!
//WorkflowTrace.Runtime.TraceEvent(TraceEventType.Information, 0, "Workflow Runtime: WorkflowExecutor: Got a dynamic update request from outside for instance {0}", this.InstanceIdString);
DiagnosticStackTrace("dynamic update request");
// check arguments
if (workflowChanges == null)
throw new ArgumentNullException("workflowChanges");
// check if this is a valid in-memory instance
if (!this.IsInstanceValid)
throw new InvalidOperationException(ExecutionStringManager.WorkflowNotValid);
if (this.currentAtomicActivity != null)
throw new InvalidOperationException(ExecutionStringManager.Error_InsideAtomicScope);
try
{
using (ScheduleWork work = new ScheduleWork(this))
{
// block other instance operations from outside
using (this._executorLock.Enter())
{
// check if this is a valid in-memory instance
if (!this.IsInstanceValid)
throw new InvalidOperationException(ExecutionStringManager.WorkflowNotValid);
// get the instance to stop running
this.Scheduler.CanRun = false;
using (new SchedulerLockGuard(this._schedulerLock, this))
{
using (new ServiceEnvironment(this.rootActivity))
{
bool localSuspend = false;
// check if this is a valid in-memory instance
if (!this.IsInstanceValid)
throw new InvalidOperationException(ExecutionStringManager.WorkflowNotValid);
try
{
// check the status of the schedule
switch (this.WorkflowStatus)
{
////case ActivityExecutionStatus.Completed:
//
case WorkflowStatus.Completed:
case WorkflowStatus.Terminated:
throw new InvalidOperationException(
ExecutionStringManager.InvalidOperationRequest);
case WorkflowStatus.Suspended:
// instance already suspended
localSuspend = false;
break;
default:
// suspend the instance
this.SuspendOnIdle(null);
localSuspend = true;
break;
}
// apply the changes
workflowChanges.ApplyTo(this.rootActivity);
}
finally
{
if (localSuspend)
{
// @undone: for now this will not return till the instance is done
// Once Kumar has fixed 4335, we can enable this.
this.ResumeOnIdle(true);
}
}
}
} // release lock on scheduler
}
}
}
catch (Exception e)
{
WorkflowTrace.Runtime.TraceEvent(TraceEventType.Error, 0, "Workflow Runtime: WorkflowExecutor: dynamic update attempt from outside on instance '{0}' threw an exception '{1}' at {2}", this.InstanceIdString, e.Message, e.StackTrace);
throw;
}
}
// resumes the schedule instance sync
// must be called only from outside the instance... the thread running the instance must
// never call this method... it should call ResumeOnIdle instead.
internal void Resume()
{
WorkflowTrace.Runtime.TraceEvent(TraceEventType.Information, 0, "Workflow Runtime: WorkflowExecutor: Got a resume request for instance {0}", this.InstanceIdString);
try
{
// check if this is a valid in-memory instance
if (!this.IsInstanceValid)
throw new InvalidOperationException(ExecutionStringManager.WorkflowNotValid);
using (ScheduleWork work = new ScheduleWork(this))
{
// Stop threads from outside - message delivery and control operations
using (this._executorLock.Enter())
{
// check if this is a valid in-memory instance
if (!this.IsInstanceValid)
throw new InvalidOperationException(ExecutionStringManager.WorkflowNotValid);
if ((this.WorkflowStatus != WorkflowStatus.Suspended))
return;
using (new SchedulerLockGuard(this._schedulerLock, this))
{
//@@Undone-- bmalhi there is one test in bat
//which fails here. This check is right thing but im
//commenting it out for bat.
// Microsoft: this fails because when we load an instance into memory it grabs
// the scheduler lock and starts running. By the time the user Resume request
// gets the scheduler lock the instance is often done (the AbortBat test case scenario)
// Balinder is attempting a fix to separate rehydration from resuming execution.
/*if (!this.IsInstanceValid)
throw new InvalidOperationException(ExecutionStringManager.WorkflowNotValid);
*/
using (new ServiceEnvironment(this.rootActivity))
{
this.ResumeOnIdle(true);
}
}
}
}
}
catch (Exception e)
{
WorkflowTrace.Runtime.TraceEvent(TraceEventType.Error, 0, "Workflow Runtime: WorkflowExecutor: Resume attempt on instance '{0}' threw an exception '{1}' at {2}", this.InstanceIdString, e.Message, e.StackTrace);
throw;
}
}
internal void EnqueueItemOnIdle(IComparable queueName, object item, IPendingWork pendingWork, Object workItem)
{
using (ScheduleWork work = new ScheduleWork(this))
{
// prevent other control operations from outside
using (this._executorLock.Enter())
{
if (!this.IsInstanceValid)
throw new InvalidOperationException(ExecutionStringManager.WorkflowNotValid);
// take the msg delivery lock to make sure the instance
// doesn't persist while the message is being delivered.
using (InstanceLock.InstanceLockGuard messageDeliveryLockGuard = this.MessageDeliveryLock.Enter())
{
using (new ServiceEnvironment(this.rootActivity))
{
if (!this.IsInstanceValid)
throw new InvalidOperationException(ExecutionStringManager.WorkflowNotValid);
// Wait until the Scheduler is idle.
while (!this.IsIdle)
{
messageDeliveryLockGuard.Wait();
if (!this.IsInstanceValid)
throw new InvalidOperationException(ExecutionStringManager.WorkflowNotValid);
}
// At this point the scheduler is not running and it is
// EnqueueItemOnIdle is not valid for suspended workflows
if ((this.WorkflowStatus == WorkflowStatus.Suspended) || (!this.Scheduler.CanRun))
throw new InvalidOperationException(ExecutionStringManager.InvalidWaitForIdleOnSuspendedWorkflow);
try
{
// add work items to the current batch if exists
if (pendingWork != null)
{
IWorkBatch batch = (IWorkBatch)this.rootActivity.GetValue(WorkflowExecutor.TransientBatchProperty);
batch.Add(pendingWork, workItem);
}
stateChangedSincePersistence = true;
qService.EnqueueEvent(queueName, item);
}
finally
{
if (this.IsIdle)
messageDeliveryLockGuard.Pulse();
}
}
}
}
}
}
internal void EnqueueItem(IComparable queueName, object item, IPendingWork pendingWork, Object workItem)
{
using (ScheduleWork work = new ScheduleWork(this))
{
bool lockedScheduler = false;
if (!ServiceEnvironment.IsInServiceThread(InstanceId))
lockedScheduler = _schedulerLock.TryEnter();
try
{
// take the msg delivery lock to make sure the instance
// doesn't persist while the message is being delivered.
using (this.MessageDeliveryLock.Enter())
{
if (!this.IsInstanceValid)
throw new InvalidOperationException(ExecutionStringManager.WorkflowNotValid);
if (lockedScheduler || ServiceEnvironment.IsInServiceThread(InstanceId))
{
using (new ServiceEnvironment(this.RootActivity))
{
qService.EnqueueEvent(queueName, item);
}
}
else
{
if (qService.SafeEnqueueEvent(queueName, item))
{
ScheduleWork.NeedsService = true;
}
}
// add work items to the current batch if exists
if (pendingWork != null)
{
IWorkBatch batch = _resourceManager.BatchCollection.GetBatch(this.rootActivity);
batch.Add(pendingWork, workItem);
}
stateChangedSincePersistence = true;
}
}
finally
{
if (lockedScheduler)
_schedulerLock.Exit();
}
}
}
