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transaction is a set of operations performed so all operations are guaranteed to succeed or fail as one unit. A common example of a simple transaction is transferring money from a checking account to a savings account. This involves two operations: deducting money from the checking account and adding it to the savings account. Both must succeed together and be committed to the accounts, or both must fail together and be rolled back so that the accounts are maintained in a consistent state. Under no circumstances should money be deducted from the checking account but not added to the savings account (or vice versa). By using a transaction, both operations can be guaranteed to succeed or fail together. Transactions may comprise many individual operations and even other transactions. Transactions are essential for maintaining data integrity, both for multiple related operations and when multiple users update the database concurrently. In this chapter, we ll cover: When to use transactions The ACID properties of a transaction Coding transactions

class Listing 54 { static void Main(string[] args) { for (int i = 1; i < 5; i++) { try { Person p = PersonCreatePerson("Adam Freeman", 38, "London"); ConsoleWriteLine("Successfully Created Instance Number: {0}", i); } catch (InvalidOperationException) { ConsoleWriteLine("Exception thrown while creating instance {0}", i); break; } } // wait for input before exiting ConsoleWriteLine("Press enter to finish"); ConsoleReadLine(); } } The factory method in Listing 9-54 is shown in bold The Person class has a static instructor that initializes two static fields used to track and limit the number of Person instances that can be created A private constructor is used by the factory method to create new instances of Person When the number of instances created exceeds the limit, further requests to the factory method result in an exception being thrown.

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// Establish the factory to // contain the bean definitions final DefaultListableBeanFactory bf = new DefaultListableBeanFactory(); // Register the transport implementations bf.registerBeanDefinition("smtp", new RootBeanDefinition(SmtpImpl.class,true)); bf.registerBeanDefinition("soap", new RootBeanDefinition(SoapImpl.class,true)); // Register and configure the SMTP example as // a bean definition BeanDefinitionBuilder builder = null; builder = BeanDefinitionBuilder. rootBeanDefinition(LooselyCoupled.class); builder = builder.setSingleton(true); builder = builder.addConstructorArgReference("smtp"); bf.registerBeanDefinition("looseSmtp",builder.getBeanDefinition()); // Register and configure the SOAP example as // a bean definition builder = BeanDefinitionBuilder. rootBeanDefinition(LooselyCoupled.class); builder = builder.setSingleton(true); builder = builder.addConstructorArgReference("soap"); bf.registerBeanDefinition("looseSoap",builder.getBeanDefinition()); // Instantiate the smtp example and invoke it final LooselyCoupled lc1 = (LooselyCoupled)bf.getBean("looseSmtp"); lc1.sendMessage(); // Instantiate the soap example and invoke it final LooselyCoupled lc2 = (LooselyCoupled)bf.getBean("looseSoap"); lc2.sendMessage(); The first question that would tend to spring to mind after reading through Listing 3-5 and comparing it to Listing 3-4 is, Why would I ever want to do something so ungainly You wouldn t, of course. Listing 3-5 is purely an illustration of what goes on under the covers of the framework. You might use a few of these classes if you were extending part of the framework itself, but most developers will never (or at most rarely) need to touch

lsTxt=$(ls /Applications 2>&1)

The minimalist application shown in Listing 14-2 and Figure 14-1 does nothing but use the server to compute the time, something easily done on the local machine. Listing 14-6 shows the .aspx code for a web application shown in Figure 14-2 that computes a list of prime numbers for a selected range. The web.config file for this application remains the same. Listing 14-6. Computing and Displaying a Range of Prime Numbers Using the Web Server <%@ Page Language="F#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script language="F#" runat="server"> member page.GenerateData_Click(sender: obj, e: EventArgs) = let isPrime(i: int) = let lim = int(sqrt(float(i)))

(Exceptions and the try statement used in the Main method are discussed in 14) Compiling and running the code in Listing 9-54 produces the following results: Successfully Created Instance Number: 1 Successfully Created Instance Number: 2 Successfully Created Instance Number: 3 Exception thrown while creating instance 4 Press enter to finish This is a very simple demonstration of a factory method, and there are a couple of problems with it The first is that it is not safe for use with programs that use parallel programming techniques These techniques, and the features you can use to make code like Listing 9-54 safe, are discussed later in this book The second problem is that there is no way to restore the limited supply of Person instances Once a certain number have been created, further requests result in an exception.

Summary

Now that you have added the button to the center column, your application should look like Figure 3-16. Notice how the button spans the two columns and appears in the center. For experienced HTML developers who are used to laying out their forms with tables, this approach should be very comfortable, as it closely mimics using the colspan attribute for a <TD> tag.

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