void IActivityEventListener <ActivityExecutionStatusChangedEventArgs> .OnEvent(object sender, ActivityExecutionStatusChangedEventArgs e)
{
ActivityExecutionContext context = sender as ActivityExecutionContext;
if (context == null)
{
throw new ArgumentException("sender");
}
if (context.Activity.HasPrimaryClosed && context.Activity.LockCountOnStatusChange == 1)
{
// get exception
Exception exception = (Exception)context.Activity.GetValue(ActivityExecutionContext.CurrentExceptionProperty);
if (exception != null)
{
WorkflowTransactionOptions transactionOptions = TransactedContextFilter.GetTransactionOptions(context.Activity);
if (transactionOptions != null)
{
// request revert to checkpoint state
context.RequestRevertToCheckpointState(this.OnRevertInstanceState, new StateRevertedEventArgs(exception), false, null);
}
else
{
// release locks
context.ReleaseLocks(false);
context.Activity.UnregisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this);
context.Activity.ReleaseLockOnStatusChange(this);
}
}
else
{
try
{
// 1st param is for transactional, means if the release lock on status change will try to persist the workflow instace
// if that fails, then locks will be reacquired, otherwise they will be released.
context.ReleaseLocks(true);
context.Activity.UnregisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this);
context.Activity.ReleaseLockOnStatusChange(this);
context.DisposeCheckpointState();
}
catch
{
// re-subscribe
context.Activity.RegisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this);
throw;
}
}
}
}
private static ActivityExecutionStatus ExecuteActivity(Activity activity, ActivityExecutionContext context, bool locksAcquired)
{
// acquire needed synchronization
TransactedContextFilter executor = (TransactedContextFilter)ActivityExecutors.GetActivityExecutorFromType(typeof(TransactedContextFilter));
if (!locksAcquired && !context.AcquireLocks(executor))
{
return(activity.ExecutionStatus);
}
// checkpoint for instance state
//
WorkflowTransactionOptions transaction = TransactedContextFilter.GetTransactionOptions(activity);
if (transaction != null)
{
context.CheckpointInstanceState();
}
// delegate to the next executor for the activity
return(executor.NextActivityExecutorInChain(activity).Execute(activity, context));
}
