private void ExpandInstances()
{
var group = this.Node as WorkflowNodeGroup;
if (group == null)
{
return;
}
if (group.Nodes == null)
{
return;
}
foreach (WorkflowNode node in group.Nodes)
{
var child = new WorkflowNodeInstance()
{
Node = node,
Root = this.Root,
Parent = this
};
child.ExpandInstances();
this.Children.Add(child);
}
}
public static WorkflowNodeInstance FromConfiguration(WorkflowServiceConfiguration configuration)
{
var nodeInstance = new WorkflowNodeInstance()
{
Node = configuration.Workflow,
};
nodeInstance.Root = nodeInstance;
nodeInstance.ExpandInstances();
return(nodeInstance);
}
protected override ServiceOutcome DoWork()
{
if (this.IsFirstRun)
{
this.WorkflowInstance = WorkflowNodeInstance.FromConfiguration(this.Configuration);
}
var completedSteps = new List <bool>();
bool complete = ProcessWorkflow(this.WorkflowInstance, WorkflowNodeFailureBehavior.Terminate, completedSteps);
Progress = completedSteps.Count(b => b) / completedSteps.Count;
return(complete ? ServiceOutcome.Success : ServiceOutcome.Unspecified);
}
bool ProcessWorkflow(WorkflowNodeInstance nodeInstance, WorkflowNodeFailureBehavior failureBehavior, List <bool> completedSteps)
{
bool complete;
if (nodeInstance.Node is WorkflowNodeGroup)
{
var group = (WorkflowNodeGroup)nodeInstance.Node;
complete = true;
foreach (WorkflowNodeInstance child in nodeInstance.Children)
{
var stepComplete = ProcessWorkflow(child, group.FailureBehavior, completedSteps);
complete &= stepComplete;
if (!stepComplete && group.Mode == WorkflowNodeGroupMode.Linear)
{
break;
}
}
}
else if (nodeInstance.Node is WorkflowStep)
{
var step = (WorkflowStep)nodeInstance.Node;
if (nodeInstance.Instance == null)
{
ServiceConfiguration config;
if (String.IsNullOrEmpty(step.Name))
{
config = step.ServiceConfiguration;
}
else
{
config = step.ServiceConfiguration.Derive();
config.ServiceName = step.Name;
}
nodeInstance.Instance = this.NewChildService(config);
nodeInstance.Instance.StateChanged += new EventHandler(Instance_StateChanged);
nodeInstance.Instance.Connect();
try
{
Environment.ScheduleServiceInstance(nodeInstance.Instance);
}
catch (Exception ex)
{
throw new WorkflowException(String.Format("Error trying to run the step '{0}'.", nodeInstance.Node.Name), ex);
}
}
if (failureBehavior == WorkflowNodeFailureBehavior.Terminate && nodeInstance.Instance.State == ServiceState.Ended && nodeInstance.Instance.Outcome != ServiceOutcome.Success)
{
throw new WorkflowException(String.Format("Workflow step '{0}' failed, terminating.", nodeInstance.Instance.Configuration.ServiceName));
}
complete = nodeInstance.Instance.State == ServiceState.Ended;
completedSteps.Add(complete);
}
else
{
throw new NotSupportedException(String.Format("Workflow node type '{0}' not supported.", nodeInstance.Node.GetType()));
}
return(complete);
}
