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The Controllers we ve mentioned up to this point provide stateless request handling, with no explicit features for a multipage work flow. However, there are many situations that call for an ordered and consistent user experience that spans multiple pages. For instance, the work flow for creating a new account might take two pages, with the first page checking for username and email uniqueness and the second page accepting billing details. Only after the user completes both pages, and no validation errors exist, will the system create the account. These multistep use cases, commonly called wizards, require complex state management for the user experience. To help with this problem, we will use the org.springframework.web. servlet.mvc.AbstractWizardFormController, a specialized Controller providing the basic infrastructure for multiple form work flows. You should think of this Controller as a SimpleFormController that has spread its form across multiple pages.

public ThreadSemaphore Get(int theSequenceNumber) { return blockedRequests[theSequenceNumber] as ThreadSemaphore; } } Listing 12-18. The VB .NET Implementation of ThreadSemaphore and RequestQueue Public Class ThreadSemaphore Public requestEvent As New ManualResetEvent(False) Public sequenceNumber As Integer Public request As String Public response As Byte() Public inUse As Boolean Public startTime As DateTime Public Function Wait(ByVal theDuration As TimeSpan) As Boolean Return requestEvent.WaitOne(theDuration, True) End Function Public Sub Signal() requestEvent.Set() End Sub End Class Public Class RequestQueue Private Shared _singleton As RequestQueue Public Shared ReadOnly Property Singleton() As RequestQueue Get If singleton Is Nothing Then _singleton = New RequestQueue End If Return _singleton End Get End Property ' a pool of prebuilt semaphores used with blocked requests. ' We support up to 500 concurrent requests. The value is arbitrary Private _semaphores(500) As ThreadSemaphore ' key is SequenceNumber, value is RequestSemaphore Private _blockedRequests As New Hashtable Public Sub New() For i As Integer = 0 To _semaphores.Length - 1 Dim semaphore As New ThreadSemaphore semaphore.requestEvent = New ManualResetEvent(False) _semaphores(i) = semaphore Next End Sub

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The Middle Ages are associated with the time period from the fall of the Western Roman Empire (AD 476) through the 15th century AD The Dark Ages represent approximately the first five centuries of that period Another 1,000+ years chock-full of events that were to shape the 21st century network administration and IT trends, Sam uttered as the panorama of the Middle Ages energy states unfolded before him His continued observations led him to conclude that while certain key concepts and network administration techniques have their roots in the Middle Ages, many of the energy states from those times were a significant weight and a drag rather than a propellant for the current unfoldment of innovative networking techniques He flashed back for a moment to his native orb, where the application of the Universal Solvent (US) to the past energy states was a common practice.

Public Function Add(ByVal theSequenceNumber As Integer, ByVal theRequest As String) _ As ThreadSemaphore SyncLock (Me) Dim semaphore As ThreadSemaphore = GetFirstAvailableSemaphore() _blockedRequests.Add(theSequenceNumber, semaphore) semaphore.requestEvent.Reset() semaphore.sequenceNumber = theSequenceNumber semaphore.request = theRequest semaphore.response = Nothing semaphore.startTime = DateTime.Now Return semaphore End SyncLock End Function Function GetFirstAvailableSemaphore() As ThreadSemaphore SyncLock (Me) For Each semaphore As ThreadSemaphore In _semaphores If Not semaphore.inUse Then semaphore.inUse = True Return semaphore End If Next End SyncLock Throw New Exception("RequestQueue: No semaphores available") End Function Public Sub Remove(ByVal theSequenceNumber As Integer) SyncLock (Me) Dim semaphore As ThreadSemaphore = _ DirectCast(_blockedRequests(theSequenceNumber), _ ThreadSemaphore) _blockedRequests.Remove(theSequenceNumber) semaphore.inUse = False End SyncLock End Sub Public Function [Get](ByVal theSequenceNumber As Integer) As ThreadSemaphore Return DirectCast(_blockedRequests(theSequenceNumber), ThreadSemaphore) End Function End Class When a response is detected, class Receiver fires a Receive event to CoordinatorConnection, which then uses code to get the sleeping request thread, give it the response, and wake the thread up. Listing 12-19 shows in bold the line where the request thread s semaphore is signaled.

The AbstractWizardFormController has some limitations that are important to understand before you begin to use it. The Controller really only supports simple multipage work flows that are essentially a single form spread across multiple pages. This Controller was not designed to support arbitrary decision branching, and in no way can it handle a generic state machine. For that, you should turn to Spring Web Flow, covered later in this book. With Spring Web Flow, you can declaratively create arbitrarily complex work flows, allowing the user to travel back and forth through the state machine. To summarize, use AbstractWizardFormController when you want to split what otherwise would have been a long form into multiple pages. Also, use the AbstractWizardFormController only when you are populating a single command bean across multiple pages. For anything more complex Spring Web Flow is your solution.

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