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As you know, Service Broker conversations can be long-running dialogs that last for days or even months or years. It would obviously be incredibly inefficient and probably impossible to keep a copy of the application active for every active conversation. Service Broker applications, like most highly scalable applications, solve this problem by maintaining persistent state between messages. The state of an application contains enough information to pick up processing when the next message arrives. For example, the state for an order-entry application might track the status of each order and the schedule of that order, so that the application knows what s going on for a specific order when you ask about it. As soon as the order gets processed through a message, the status of the order is modified and the state is saved to reflect the changes that processing the message caused. Maintaining too much state in web applications or in web services leads to huge scalability problems in your application. However, if your application is running in the database, storing the application state doesn t impact scalability that much. The messaging operations, database updates, and state updates are all part of a simple single-phase transaction and are committed with the same log write.

The first step to using the BackgroundWorker with the prime number search example is to create a custom class that allows you to transmit the input parameters to the BackgroundWorker. When you call BackgroundWorker.RunWorkerAsync(), you can supply any object, which will be delivered to the DoWork event. However, you can supply only a single object, so you need to wrap the to and from numbers into one class, as shown here: Public Class FindPrimesInput Private _toNumber As Integer Public Property ToNumber() As Integer Get Return _toNumber End Get Set(ByVal value As Integer) _toNumber = value End Set End Property Private _fromNumber As Integer Public Property FromNumber() As Integer Get Return _fromNumber End Get Set(ByVal value As Integer) _fromNumber = value End Set End Property

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Most of the results in this table are unsurprising. The string something is alwkays recognized as existing, as you would expect. Similarly, the numeric value 12345 is recognized as existing by every test except is_string(), again as you might expect. What is a bit disconcerting is that the empty string '' is recognized as existing by the tests isset() and is_string(). In some metaphysical sense, of course, the empty string is indeed a string, and it is indeed set to a value (of nothing). (See http://education.nyphp.org /phundamentals/PH_variableevaluation.php for a lengthy discussion of this issue.) But these tests are not typically deployed to check for metaphysical existence. The moral here is to be extremely careful when using such tests for existence. We consider empty() to be perhaps the most intuitive of these tests, but still recommend that even it be used in conjunction with other tests rather than by itself.

Conversation groups are similar to a dialog, where several messages are exchanged between the sender and the receiver.

Public Sub New(ByVal fromNumber As Integer, ByVal toNumber As Integer) Me.ToNumber = toNumber Me.FromNumber = fromNumber End Sub End Class To start the BackgroundWorker on its way, you need to call the BackgroundWorker.RunWorkerAsync() method and pass in the FindPrimesInput object. Here s the code that does this when the user clicks the Find Primes button: Private Sub cmdFind_Click(ByVal sender As Object, ByVal e As RoutedEventArgs) ' Disable this button and clear previous results. cmdFind.IsEnabled = False cmdCancel.IsEnabled = True lstPrimes.Items.Clear() ' Get the search range. Dim fromNumber, toNumber As Integer If (Not Int32.TryParse(txtFrom.Text, fromNumber)) Then MessageBox.Show("Invalid From value.") Return End If If (Not Int32.TryParse(txtTo.Text, toNumber)) Then MessageBox.Show("Invalid To value.") Return End If ' Start the search for primes on another thread. Dim input As New FindPrimesInput(fromNumber, toNumber) backgroundWorker.RunWorkerAsync(input) End Sub When the BackgroundWorker begins executing, it fires the DoWork event on a separate thread. Rather than create this thread (which incurs some overhead), the BackgroundWorker borrows a thread from the runtime thread pool. When the task is complete, the BackgroundWorker will return this thread to the thread pool, so it can be reused for another task. The thread pool threads are also used for the asynchronous operations you ve seen in other chapters, such as receiving a web service response, downloading a web page, and accepting a socket connection.

When you check the length of user input, you can prevent buffer overflow and denial-of-service attacks. The length of a string can be checked with strlen(), which counts the number of 1-byte characters in a string value. Since year values should be exactly 4 characters long, receiving an 89-character response to a prompt for a year value should suggest that something is wrong. The value s length can be easily checked, like this: if ( strlen( $year ) != 4 ) exit ( "$year is an invalid value for year!" );

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