private static IDistributedMutex ConstructLock(string instanceId)
{
return(Catalog.Preconfigure()
.Add(DistributedMutexLocalConfig.Name, WorkflowShared.WorkflowInstanceLockName(instanceId))
.Add(DistributedMutexLocalConfig.UnusedExpirationSeconds, 60)
.ConfiguredResolve <IDistributedMutex>());
}
/// <summary>
/// Try to lock and host a pre-existing workflow.
/// </summary>
/// <param name="workflowId"> </param>
/// <returns> </returns>
private WorkflowAgent TryAcquireWorkflow(string workflowId)
{
WorkflowAgent acquired = null;
var wfMutex = Catalog.Preconfigure()
.Add(DistributedMutexLocalConfig.Name, WorkflowShared.WorkflowInstanceLockName(workflowId))
.ConfiguredResolve <IDistributedMutex>();
if (wfMutex.Open())
{
try
{
var wftemp = GetWorkflowTemplate(workflowId);
if (!string.IsNullOrWhiteSpace(wftemp))
{
acquired = WorkflowAgent.AcquireSleepingOnLocked(wfMutex, this, workflowId, _ct, wftemp, _workflowDataRepositoryKey, _workflowMessagingKey, _workflowWorkspaceKey);
if (null != acquired)
{
if (_agents.TryAdd(workflowId, acquired))
{
acquired.Start();
}
else
{
_dblog.WarnFormat("Strange: locked workflow {0} but couldn't add it", workflowId);
}
}
}
}
catch (SynchronizationLockException)
{
_dblog.InfoFormat("Synchronization lock exception while trying to acquire {0}", workflowId);
wfMutex.Release();
}
catch (WorkflowTemplateException wfex)
{
var es = string.Format("Error loading template for workflow! {0}: {1}", workflowId, wfex);
_log.Error(es);
var on = Catalog.Factory.Resolve <IApplicationAlert>();
on.RaiseAlert(ApplicationAlertKind.Unknown, es);
wfMutex.Release();
}
catch (Exception ex)
{
var es = string.Format("Error while acquiring workflow, {0}", ex);
_log.Error(es);
var on = Catalog.Factory.Resolve <IApplicationAlert>();
on.RaiseAlert(ApplicationAlertKind.Unknown, es);
wfMutex.Release();
}
}
else
{
_dblog.InfoFormat("Could not lock {0}", workflowId);
}
return(acquired);
}
