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It will look like the following: Private Sub Code1_ExecuteCode(ByVal sender As SystemObject, ByVal e As SystemEventArgs) MsgBox("Code 1: Counter=" & IntCounter) End Sub This displays Code 1 and the number stored in the variable Run the workflow Because there s no UntilCondition on the CAG activity, all activities are only executed once View the code of the workflow and add a Code1WhileCondition with the following code, then set the Condition property of the Code1 activity to be this condition: Private Sub Code1WhileCondition(ByVal sender As SystemObject, ByVal e As ConditionalEventArgs) eResult = IntCounter <4 IntCounter = IntCounter+1 End Sub This condition, and setting the property, causes the Code1 activity to execute each time the CAG executes and the IntCounter value is less than 4 Run the workflow again Again, you get the same result: the Code1 message box only displays one time.

While this example perfectly matches how Queue<T> works, you probably wouldn t use a Queue<T> here in practice. You d want to handle crashes and power failures gracefully in this application, which means that in practice, you d probably store the list of waiting patients in a database, along with something such as a ticket number indicating their place in the queue. In-memory queues tend to show up more often in multithreaded servers for keeping track of outstanding work. But since we haven t gotten to either the networking or the threading chapters yet, an example along those lines would be premature.

Queue<T> implements IEnumerable<T>, so you can use LINQ queries across items in the whole queue. It also implements ICollection<T>, so you can discover whether the queue is currently empty by inspecting its Count property. Queue<T> operates in strict first in, first out (FIFO) order, which is to say that Dequeue will return items in exactly the same order in which they were added with Enqueue. That

A paused domain will still use allocated resources such as memory and CPU, and it cannot be scheduled to run by the hypervisor Shutdown (s): The domain is being shut down, rebooted, or suspended A shutdown state is also shown when the domain is in the process of being destroyed Crashed (c): The domain has crashed Usually, this state can occur only if the domain has been configured not to restart on crash Dying (d): The domain is in process of dying but has not completely shut down or crashed Time(s): This column tells how long the domain has been running as calculated by Xen in seconds The list command of xm is one of the many commands that you can use to manage your Xen domains You will learn additional xm commands later after you install your first guest..

If you ve ever had to visit a hospital emergency room, you ll know that waiting in a queue is one of the defining features of the experience unless you were either very lucky or very unlucky. If you were lucky, the queue will have been empty and you will not have had to wait. Alternatively, if you were unlucky, your condition may have been sufficiently perilous that you got to jump to the head of the queue. In medical emergencies, a triage system will be in place to work out where each arriving patient should go in the queue. A similar pattern crops up in other scenarios frequent fliers with gold cards may be allocated standby seats at the last minute even though others have been waiting for hours; celebrities might be able to walk right into a restaurant for which the rest of us have to book a table weeks in advance. The LinkList<T> class is able to model these sorts of scenarios. At its simplest, you could use it like a Queue<T> call AddLast to add an item to the back of the queue (as Enqueue would), and RemoveFirst to take the item off the head of the queue (like Dequeue would). But you can also add an item to the front of the queue with AddFirst. Or you can add items anywhere you like in the queue with the AddBefore and AddAfter methods. Example 9-13 uses this to place new patients into the queue.

private LinkedList<Patient> waitingPatients = new LinkedList<Patient>(); ... LinkedListNode<Patient> current = waitingPatients.First;