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If the menu editor (Figure 2 4, lower left) is not showing, open it by double-clicking the MainMenu icon in your nib s main window. The menu editor allows you to edit the contents of your application s menu bar. By default, MainMenu.xib comes with many of the standard menu items that you would want in a Cocoa application. We ll get into the specifics of working with the menu bar later in the book, but here s a quick overview. As you build your application, you ll provide actions for the each menu item you want to support. When the menu bar is drawn, if an action to respond to an item is available, the item is enabled. If no action is available, the item is disabled (grayed out). Some actions are provided for you, such as those provided for text-related menus like Copy or Paste. For items you will never use, the best approach is just to delete them. For the moment, don t worry about the mechanics of working with the menu bar. Let s customize the menu bar for our Hello World application. If you re running Snow Leopard, the menu has been pre-configured to use your application s name in the relevant places, but for projects created on Leopard, you ll see the text

Create() Fetch() Update() Delete() Execute()

Keeps track of whether the object is new, old, dirty, clean, or marked for deletion Provides access to the underlying n-level undo functionality implemented in UndoableBase, and implements the IEditableObject interface Implement behaviors so the object can function as either a stand-alone object, a parent object, or a child of another object or collection Provide abstract access to the validation rules behavior (discussed later in the chapter) and implement the IDataErrorInfo interface Provide abstract access to the authorization rules behavior (discussed later in the chapter) Implements the ICloneable interface

<server name>; as in MyServer .; or (local); .\<MyInstance>; as in .\SS2K8; <domain>\<server>\<instance>; <IP>,<Port>;

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possible response time for a given user the ideal solution is to put the client, the logic, and the data on the user s machine. This means no network hops, no network latency, and no contention with other users. If you decide that you need to support multiple users, you might consider putting application data on a central file server. (This is typical with Access and dBASE systems, for example.) However, this immediately affects performance because of contention on the data file. Furthermore, data access now takes place across the network, which means you ve introduced network latency and network contention, too. To overcome this problem, you could put the data into a managed environment such as SQL Server or Oracle. This will help to reduce data contention, but you re still stuck with the network latency and contention problems. Although improved, performance for a given user is still nowhere near what it was when everything ran directly on that user s computer. Even with a central database server, scalability is limited. Clients are still in contention for the resources of the server, with each client opening and closing connections, doing queries and updates, and constantly demanding the CPU, memory, and disk resources that other clients are using. You can reduce this load by shifting some of the work to another server. An application server, possibly running Enterprise Services or Internet Information Services (IIS), can provide database connection pooling to minimize the number of database connections that are opened and closed. It can also perform some data processing, filtering, and even caching to offload some work from the database server.

The java.sql package is the primary package for JDBC. It offers the main classes for interacting with your data sources. Since the changes to javax.sql are so small, I ll cover the two together. The new features in these packages for Mustang include changes in the following areas: Database driver loading Exception handling improvements Enhanced BLOB/CLOB functionality Connection and statement interface enhancements National character set support SQL ROWID access SQL 2003 XML data type support Annotations

Stop()

The test is written as if the production code were already working, so the test failing means there s a bug in the production code. For example, if I wanted to add a new feature to a calculator class that remembers the LastSum value, I would write a test that verifies that LastSum is indeed a number. The test will fail because we haven t implemented that functionality yet.

Figure 7-6. Using WCF services hosted in Azure to drive WF workflows via HttpWebRequest and HttpWebResponse

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