public void ProtectedRun()
{
DateTime lastException = DateTime.MinValue;
while (!_ct.IsCancellationRequested)
{
try
{
// any wfs fall through the cracks and are asleep but have triggers?
IEnumerable <WorkflowInstanceInfo> sleeping = Enumerable.Empty <WorkflowInstanceInfo>();
var instancesQuery = new QuerySpecification
{
BookMark = new GenericPageBookmark {
PageSize = 100
},
Where = new Filter
{
Rules = new Comparison[]
{
new Comparison
{
Data = WorkflowStatus.Sleeping.ToString(),
Field = "Status",
Test = Test.Equal
}
}
}
};
instancesQuery.BookMark = new GenericPageBookmark {
PageSize = 100
};
while (instancesQuery.BookMark.More)
{
var qr = _instanceData.Query(instancesQuery);
if (qr.Items.Any())
{
sleeping = sleeping.Concat(qr.Items);
}
}
sleeping = sleeping.ToArray();
Parallel.ForEach(sleeping,
nc =>
{
try
{
// check for triggers
IEnumerable <WorkflowMachineState> hasTriggers = Enumerable.Empty <WorkflowMachineState>();
var hasTriggersQuery = new QuerySpecification
{
BookMark = new GenericPageBookmark {
PageSize = 100
},
Where = new Filter
{
Rules = new Comparison[]
{
new Comparison
{
Field = "Parent",
Data = nc.Id,
Test = Test.Equal
}
}
}
};
while (hasTriggersQuery.BookMark.More)
{
var qr = _machineStateData.Query(hasTriggersQuery);
if (qr.Items.Any())
{
hasTriggers = hasTriggers.Concat(qr.Items);
}
}
// it has some, try to acquire it
if (hasTriggers.Any())
{
_ct.ThrowIfCancellationRequested();
_log.InfoFormat(
"Sleeping workflow {0} has {1} waiting triggers. Waking.", nc.Id,
hasTriggers.Count());
TryAcquireWorkflow(nc.Id);
}
}
catch (Exception ex)
{
_dblog.ErrorFormat("Problem while waking workflow {0}:{2}", nc.Id,
ex.ToString());
}
});
// groom completed and data
IEnumerable <WorkflowInstanceInfo> completedInstances = Enumerable.Empty <WorkflowInstanceInfo>();
var completedQuery = new QuerySpecification
{
BookMark = new GenericPageBookmark {
PageSize = 100
},
Where = new Filter
{
Rules = new Comparison[]
{
new Comparison
{
Data = WorkflowStatus.Complete.ToString(),
Field = "Status",
Test = Test.Equal
}
}
}
};
completedQuery.BookMark = new GenericPageBookmark {
PageSize = 100
};
while (completedQuery.BookMark.More)
{
var qr = _instanceData.Query(completedQuery);
if (qr.Items.Any())
{
completedInstances = completedInstances.Concat(qr.Items);
}
}
completedInstances = completedInstances.ToArray();
Parallel.ForEach(completedInstances,
ci =>
{
try
{
_log.InfoFormat("Grooming completed workflow instance {0}", ci.Id);
_ct.ThrowIfCancellationRequested();
// delete workspaces
var workspace = Catalog.Preconfigure()
.Add(WorkspaceLocalConfig.WorkspaceName,
WorkflowShared.WorkflowInstanceWorkspaceName(ci.Id))
.ConfiguredResolve <IWorkspace>(_workflowWorkspaceKey);
workspace.DeleteWorkspace();
_ct.ThrowIfCancellationRequested();
IEnumerable <WorkflowMachineState> states =
Enumerable.Empty <WorkflowMachineState>();
var msQuery = new QuerySpecification
{
BookMark = new GenericPageBookmark {
PageSize = 100
},
Where = new Filter
{
Rules = new Comparison[]
{
new Comparison
{
Data = ci.Id,
Field = "Parent",
Test = Test.Equal
}
}
}
};
msQuery.BookMark = new GenericPageBookmark {
PageSize = 100
};
while (msQuery.BookMark.More)
{
var qr = _machineStateData.Query(msQuery);
if (qr.Items.Any())
{
states = states.Concat(qr.Items);
}
}
_machineStateData.DeleteBatch(states.ToList());
_instanceData.Delete(ci);
}
catch (Exception ex)
{
var es = string.Format(
"Problem while grooming completed workflow {0}:{1}", ci.Id,
ex.ToString());
_dblog.Error(es);
var on = Catalog.Factory.Resolve <IApplicationAlert>();
on.RaiseAlert(ApplicationAlertKind.Unknown, es);
}
});
var chill = TimeSpan.FromMinutes((30.0 * _rndGroomTime.NextDouble()) + 1.0);
_log.InfoFormat("Waiting {0} minutes until next sweep cycle.", chill.TotalMinutes);
_ct.WaitHandle.WaitOne(chill);
}
catch (Exception ex)
{
var es = string.Format("exception running workflow host {0}",
ex.TraceInformation());
_dblog.Error(es);
if (DateTime.UtcNow - lastException > TimeSpan.FromMinutes(1.0))
{
_log.TraceException(ex);
var alert = Catalog.Factory.Resolve <IApplicationAlert>();
alert.RaiseAlert(ApplicationAlertKind.System, es);
}
}
}
}