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Message retention allows you to maintain an exact record of a conversation for a queue while the conversation is active For applications that require detailed auditing or that must perform compensating transactions when the conversation fails, it can be more efficient than copying each message to a state table while the conversation is in process Message retention increases the number of messages in the queue for active conversations and increases the amount of work that SQL Server performs when sending a message Therefore, message retention reduces the performance The exact performance impact depends on the communication pattern for the services that use that queue In general, you should use message retention any time that message retention is required for an application to operate correctly.

To create the challenge, all you need to do is place the captcha image in an HTML form and provide a text input box for the user s response, along with some basic instructions. The code for offering the challenge follows and can be found also as captchaForm.php in the 9 folder of the downloadable archive of code for Pro PHP Security at http://www.apress.com. <h1>Please Login</h1> <p> To prevent abuse by automated attempts to login, we are asking you to type the word you see displayed below. <em>If you cannot see this image, please contact us for assistance.</em> </p> <form action="< = $_SERVER['SCRIPT_NAME'] >" method="post"> <img src="captchaGenerate.php" alt="Type in the letters you see here." /> <br /> <input type="text" name="captcha" size="22" /><br /> <input type="submit" value="Login" /> </form> This is a standard HTML form, with PHP needed only to specify the form action. The source for the image is the preceding captchaGenerate.php script.

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Note Newcomers to network programming often wonder how they can handle more than one simultaneous request, and they sometimes assume that multiple server reports are required. This isn t the case if it were, a small set of applications could quickly exhaust the available ports. Instead, server applications handle multiple requests with the same port. This process is almost completely transparent because the underlying TCP architecture in Windows automatically identifies messages and routes them to the appropriate object in your code. Connections are uniquely identified based on four pieces of information: the IP address and server port, and the IP address and client port.

If the application doesn t require an exact record of all sent and received messages while the conversation is active, maintaining state in a state table may improve performance Also, remember that when the conversation ends, the retained messages are removed from the queue, so if you re using retention for auditing purposes, you must be sure to copy the messages to another table before ending the conversation To enable RETENTION on a queue, you must specify the RETENTION clause when you create or alter a queue (see Listing 6-30) Listing 6-30 Enabling RETENTION on a Queue CREATE QUEUE OrderQueue WITH STATUS = ON, RETENTION = ON.

Each time a request is make, the OnAcceptTcpClient() callback is triggered. That callback then calls BeginAcceptTcpClient() again to start waiting for the next request on another thread, and then gets to the real work of dealing with the current request: ... Public Sub OnAcceptTcpClient(ByVal ar As IAsyncResult) If isStopped Then Return Console.WriteLine("Received policy request.") ' Wait for the next connection. listener.BeginAcceptTcpClient(AddressOf OnAcceptTcpClient, Nothing) ' Handle this connection. Try Dim client As TcpClient = listener.EndAcceptTcpClient(ar) Dim policyConnection As New PolicyConnection(client, policy) policyConnection.HandleRequest() Catch err As Exception Console.WriteLine(err.Message) End Try End Sub ...

When the user submits the form, you compare his answer to $_SESSION['captcha_word'], and if it matches, then you can be reasonably certain that he is a human. The code for retrieving the user s response and comparing it to the correct response follows and can be found also as captchaCheck.php in the 9 folder of the downloadable archive of code for Pro PHP Security at http://www.apress.com. < php session_start(); if ( !empty( $_POST['captcha'] ) ) { if ( !isset( $_SESSION['target'] ) ) { print '<h1>Sorry, there was an error in logging in. Please contact us for assistance.</h1>'; } elseif ( $_SESSION['target'] === $_POST['captcha'] ) { print '<h1>You have successfully logged in!</h1>'; unset( $_SESSION['target'] ); } else { print '<h1>Incorrect! You are not logged in.</h1>'; } } >

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